How to rename a file using Python
You can use os.system to invoke terminal to accomplish the task:
os.system('mv oldfile newfile')
Convert Iterator to ArrayList
Note there is a difference between Iterable and Iterator.
If you have an Iterable, then with Java 8 you can use this solution:
Iterable<Element> iterable = createIterable();
List<Element> array = StreamSupport
.stream(iterable.spliterator(), false)
.collect(Collectors.toList());
As I know Collectors.toList() creates ArrayList instance.
Actually in my opinion, it also looks good in one line.
For example if you need to return List<Element> from some method:
return StreamSupport.stream(iter.spliterator(), false).collect(Collectors.toList());
CSS: auto height on containing div, 100% height on background div inside containing div
In 2018 a lot of browsers support the Flexbox and Grid which are very powerful CSS display modes that overshine classical methods such as Faux Columns or Tabular Displays (which are treated later in this answer).
In order to implement this with the Grid, it is enough to specify display: grid and grid-template-columns on the container. The grid-template-columns depends on the number of columns you have, in this example I will use 3 columns, hence the property will look: grid-template-columns: auto auto auto, which basically means that each of the columns will have auto width.
Full working example with Grid:
html, body {_x000D_
padding: 0;_x000D_
margin: 0;_x000D_
}_x000D_
_x000D_
.grid-container {_x000D_
display: grid;_x000D_
grid-template-columns: auto auto auto;_x000D_
width: 100%;_x000D_
}_x000D_
_x000D_
.grid-item {_x000D_
padding: 20px;_x000D_
}_x000D_
_x000D_
.a {_x000D_
background-color: DarkTurquoise;_x000D_
}_x000D_
_x000D_
.b {_x000D_
background-color: LightSalmon;_x000D_
}_x000D_
_x000D_
.c {_x000D_
background-color: LightSteelBlue;_x000D_
}<!DOCTYPE html>_x000D_
<html>_x000D_
<head>_x000D_
<title>Three Columns with Grid</title>_x000D_
<link rel="stylesheet" type="text/css" href="style.css">_x000D_
</head>_x000D_
<body>_x000D_
_x000D_
<div class="grid-container">_x000D_
<div class="grid-item a">_x000D_
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Maecenas id sapien auctor, faucibus felis et, commodo magna. Sed eu molestie nibh, ac tincidunt turpis. Pellentesque accumsan nunc non arcu tincidunt auctor eget ut magna. In vel est egestas, ultricies dui a, gravida diam. Vivamus tempor facilisis lectus nec porta.</p>_x000D_
</div>_x000D_
<div class="grid-item b">_x000D_
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Maecenas id sapien auctor, faucibus felis et, commodo magna. Sed eu molestie nibh, ac tincidunt turpis. Pellentesque accumsan nunc non arcu tincidunt auctor eget ut magna. In vel est egestas, ultricies dui a, gravida diam. Vivamus tempor facilisis lectus nec porta. Donec commodo elit mattis, bibendum turpis eu, malesuada nunc. Vestibulum sit amet dui tincidunt, mattis nisl et, tincidunt eros. Vivamus eu ultrices sapien. Integer leo arcu, lobortis sed tellus in, euismod ultricies massa. Mauris gravida quis ligula nec dignissim. Proin elementum mattis fringilla. Donec id malesuada orci, eu aliquam ipsum. Vestibulum fermentum elementum egestas. Quisque sit amet tempor mi.</p>_x000D_
</div>_x000D_
<div class="grid-item c">_x000D_
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Maecenas id sapien auctor, faucibus felis et, commodo magna. Sed eu molestie nibh, ac tincidunt turpis.</p>_x000D_
</div>_x000D_
</div>_x000D_
</body>_x000D_
</html>Another way would be to use the Flexbox by specifying display: flex on the container of the columns, and giving the columns a relevant width. In the example that I will be using, which is with 3 columns, you basically need to split 100% in 3, so it's 33.3333% (close enough, who cares about 0.00003333... which isn't visible anyway).
Full working example using Flexbox:
html, body {_x000D_
padding: 0;_x000D_
margin: 0;_x000D_
}_x000D_
_x000D_
.flex-container {_x000D_
display: flex;_x000D_
width: 100%;_x000D_
}_x000D_
_x000D_
.flex-column {_x000D_
padding: 20px;_x000D_
width: 33.3333%;_x000D_
}_x000D_
_x000D_
.a {_x000D_
background-color: DarkTurquoise;_x000D_
}_x000D_
_x000D_
.b {_x000D_
background-color: LightSalmon;_x000D_
}_x000D_
_x000D_
.c {_x000D_
background-color: LightSteelBlue;_x000D_
}<!DOCTYPE html>_x000D_
<html>_x000D_
<head>_x000D_
<title>Three Columns with Flexbox</title>_x000D_
<link rel="stylesheet" type="text/css" href="style.css">_x000D_
</head>_x000D_
<body>_x000D_
_x000D_
<div class="flex-container">_x000D_
<div class="flex-column a">_x000D_
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Maecenas id sapien auctor, faucibus felis et, commodo magna. Sed eu molestie nibh, ac tincidunt turpis. Pellentesque accumsan nunc non arcu tincidunt auctor eget ut magna. In vel est egestas, ultricies dui a, gravida diam. Vivamus tempor facilisis lectus nec porta.</p>_x000D_
</div>_x000D_
<div class="flex-column b">_x000D_
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Maecenas id sapien auctor, faucibus felis et, commodo magna. Sed eu molestie nibh, ac tincidunt turpis. Pellentesque accumsan nunc non arcu tincidunt auctor eget ut magna. In vel est egestas, ultricies dui a, gravida diam. Vivamus tempor facilisis lectus nec porta. Donec commodo elit mattis, bibendum turpis eu, malesuada nunc. Vestibulum sit amet dui tincidunt, mattis nisl et, tincidunt eros. Vivamus eu ultrices sapien. Integer leo arcu, lobortis sed tellus in, euismod ultricies massa. Mauris gravida quis ligula nec dignissim. Proin elementum mattis fringilla. Donec id malesuada orci, eu aliquam ipsum. Vestibulum fermentum elementum egestas. Quisque sit amet tempor mi.</p>_x000D_
</div>_x000D_
<div class="flex-column c">_x000D_
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Maecenas id sapien auctor, faucibus felis et, commodo magna. Sed eu molestie nibh, ac tincidunt turpis.</p>_x000D_
</div>_x000D_
</div>_x000D_
</body>_x000D_
</html>The Flexbox and Grid are supported by all major browsers since 2017/2018, fact also confirmed by caniuse.com: Can I use grid, Can I use flex.
There are also a number of classical solutions, used before the age of Flexbox and Grid, like OneTrueLayout Technique, Faux Columns Technique, CSS Tabular Display Technique and there is also a Layering Technique.
I do not recommend using these methods for they have a hackish nature and are not so elegant in my opinion, but it is good to know them for academic reasons.
A solution for equally height-ed columns is the CSS Tabular Display Technique that means to use the display:table feature. It works for Firefox 2+, Safari 3+, Opera 9+ and IE8.
The code for the CSS Tabular Display:
#container {_x000D_
display: table;_x000D_
background-color: #CCC;_x000D_
margin: 0 auto;_x000D_
}_x000D_
_x000D_
.row {_x000D_
display: table-row;_x000D_
}_x000D_
_x000D_
.col {_x000D_
display: table-cell;_x000D_
}_x000D_
_x000D_
#col1 {_x000D_
background-color: #0CC;_x000D_
width: 200px;_x000D_
}_x000D_
_x000D_
#col2 {_x000D_
background-color: #9F9;_x000D_
width: 300px;_x000D_
}_x000D_
_x000D_
#col3 {_x000D_
background-color: #699;_x000D_
width: 200px;_x000D_
}<div id="container">_x000D_
<div id="rowWraper" class="row">_x000D_
<div id="col1" class="col">_x000D_
Column 1<br />Lorem ipsum<br />ipsum lorem_x000D_
</div>_x000D_
<div id="col2" class="col">_x000D_
Column 2<br />Eco cologna duo est!_x000D_
</div>_x000D_
<div id="col3" class="col">_x000D_
Column 3_x000D_
</div>_x000D_
</div>_x000D_
</div>Even if there is a problem with the auto-expanding of the width of the table-cell it can be resolved easy by inserting another div withing the table-cell and giving it a fixed width. Anyway, the over-expanding of the width happens in the case of using extremely long words (which I doubt anyone would use a, let's say, 600px long word) or some div's who's width is greater than the table-cell's width.
The Faux Column Technique is the most popular classical solution to this problem, but it has some drawbacks such as, you have to resize the background tiled image if you want to resize the columns and it is also not an elegant solution.
The OneTrueLayout Technique consists of creating a padding-bottom of an extreme big height and cut it out by bringing the real border position to the "normal logical position" by applying a negative margin-bottom of the same huge value and hiding the extent created by the padding with overflow: hidden applied to the content wraper. A simplified example would be:
Working example:
.wraper {_x000D_
overflow: hidden; /* This is important */_x000D_
}_x000D_
_x000D_
.floatLeft {_x000D_
float: left;_x000D_
}_x000D_
_x000D_
.block {_x000D_
padding-left: 20px;_x000D_
padding-right: 20px;_x000D_
padding-bottom: 30000px; /* This is important */_x000D_
margin-bottom: -30000px; /* This is important */_x000D_
width: 33.3333%;_x000D_
box-sizing: border-box; /* This is so that the padding right and left does not affect the width */_x000D_
}_x000D_
_x000D_
.a {_x000D_
background-color: DarkTurquoise;_x000D_
}_x000D_
_x000D_
.b {_x000D_
background-color: LightSalmon;_x000D_
}_x000D_
_x000D_
.c {_x000D_
background-color: LightSteelBlue;_x000D_
}<html>_x000D_
<head>_x000D_
<title>OneTrueLayout</title>_x000D_
</head>_x000D_
<body>_x000D_
<div class="wraper">_x000D_
<div class="block floatLeft a">_x000D_
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Cras malesuada ipsum pretium tellus condimentum aliquam. Donec eget tempor mi, a consequat enim. Mauris a massa id nisl sagittis iaculis.</p>_x000D_
</div>_x000D_
<div class="block floatLeft b">_x000D_
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Cras malesuada ipsum pretium tellus condimentum aliquam. Donec eget tempor mi, a consequat enim. Mauris a massa id nisl sagittis iaculis. Duis mattis diam vitae tellus ornare, nec vehicula elit luctus. In auctor urna ac ante bibendum, a gravida nunc hendrerit. Praesent sed pellentesque lorem. Nam neque ante, egestas ut felis vel, faucibus tincidunt risus. Maecenas egestas diam massa, id rutrum metus lobortis non. Sed quis tellus sed nulla efficitur pharetra. Fusce semper sapien neque. Donec egestas dolor magna, ut efficitur purus porttitor at. Mauris cursus, leo ac porta consectetur, eros quam aliquet erat, condimentum luctus sapien tellus vel ante. Vivamus vestibulum id lacus vel tristique.</p>_x000D_
</div>_x000D_
<div class="block floatLeft c">_x000D_
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Cras malesuada ipsum pretium tellus condimentum aliquam. Donec eget tempor mi, a consequat enim. Mauris a massa id nisl sagittis iaculis. Duis mattis diam vitae tellus ornare, nec vehicula elit luctus. In auctor urna ac ante bibendum, a gravida nunc hendrerit.</p>_x000D_
</div>_x000D_
</div>_x000D_
</body>_x000D_
</html>The Layering Technique must be a very neat solution that involves absolute positioning of div's withing a main relative positioned wrapper div. It basically consists of a number of child divs and the main div. The main div has imperatively position: relative to it's css attribute collection. The children of this div are all imperatively position:absolute. The children must have top and bottom set to 0 and left-right dimensions set to accommodate the columns with each another. For example if we have two columns, one of width 100px and the other one of 200px, considering that we want the 100px in the left side and the 200px in the right side, the left column must have {left: 0; right: 200px} and the right column {left: 100px; right: 0;}
In my opinion the unimplemented 100% height within an automated height container is a major drawback and the W3C should consider revising this attribute (which since 2018 is solvable with Flexbox and Grid).
Other resources: link1, link2, link3, link4, link5 (important)
HTTP Status 500 - Error instantiating servlet class pkg.coreServlet
Make sure the following:
- Proper "war" file structure i.e. WEB-INF & META-INF
- "web.xml" file is setup correct.
- Last and important:
private static final long serialVersionUID = 1L;should be there in your class (<servlet-class>MyClass</servlet-class>).
How to convert a file to utf-8 in Python?
This worked for me in a small test:
sourceEncoding = "iso-8859-1"
targetEncoding = "utf-8"
source = open("source")
target = open("target", "w")
target.write(unicode(source.read(), sourceEncoding).encode(targetEncoding))
get original element from ng-click
You need $event.currentTarget instead of $event.target.
How to remove an item from an array in AngularJS scope?
I would use the Underscore.js library that has a list of useful functions.
without
without_.without(array, *values)Returns a copy of the array with all instances of the values removed.
_.without([1, 2, 1, 0, 3, 1, 4], 0, 1); // => [2, 3, 4]
Example
var res = "deleteMe";
$scope.nodes = [
{
name: "Node-1-1"
},
{
name: "Node-1-2"
},
{
name: "deleteMe"
}
];
$scope.newNodes = _.without($scope.nodes, _.findWhere($scope.nodes, {
name: res
}));
See Demo in JSFiddle.
filter
var evens = _.filter([1, 2, 3, 4, 5, 6], function(num){ return num % 2 == 0; }); // => [2, 4, 6]
Example
$scope.newNodes = _.filter($scope.nodes, function(node) {
return !(node.name == res);
});
See Demo in Fiddle.
AngularJS custom filter function
Additionally, if you want to use the filter in your controller the same way you do it here:
<div ng-repeat="item in items | filter:criteriaMatch(criteria)">
{{ item }}
</div>
You could do something like:
var filteredItems = $scope.$eval('items | filter:filter:criteriaMatch(criteria)');
How do I remove the "extended attributes" on a file in Mac OS X?
Answer (Individual Files)
1. Showcase keys to use in selection.
xattr ~/Desktop/screenshot\ 2019-10-23\ at\ 010212.png
# com.apple.FinderInfo
# com.apple.lastuseddate#PS
# com.apple.metadata:kMDItemIsScreenCapture
# com.apple.metadata:kMDItemScreenCaptureGlobalRect
# com.apple.metadata:kMDItemScreenCaptureType
2. Pick a Key to delete.
xattr -d com.apple.lastuseddate#PS ~/Desktop/screenshot\ 2019-10-23\ at\ 010212.png
xattr -d kMDItemIsScreenCapture ~/Desktop/screenshot\ 2019-10-23\ at\ 010212.png
3. Showcase keys again to see they have been removed.
xattr -l ~/Desktop/screenshot\ 2019-10-23\ at\ 010212.png
# com.apple.FinderInfo
# com.apple.metadata:kMDItemScreenCaptureGlobalRect
# com.apple.metadata:kMDItemScreenCaptureType
4. Lastly, REMOVE ALL keys for a particular file
xattr -c ~/Desktop/screenshot\ 2019-10-23\ at\ 010212.png
Answer (All Files In A Directory)
1. Showcase keys to use in selection.
xattr -r ~/Desktop
2. Remove a Specific Key for EVERY FILE in a directory
xattr -rd com.apple.FinderInfo ~/Desktop
3. Remove ALL keys on EVERY FILE in a directory
xattr -rc ~/Desktop
WARN: Once you delete these you DON'T get them back!
FAULT ERROR: There is NO UNDO.
Errors
I wanted to address the error's people are getting.
Because the errors drove me nuts too...
On a mac if you install xattr in python, then your environment may have an issue.
There are two different paths on my mac for
xattr
type -a xattr
# xattr is /usr/local/bin/xattr # PYTHON Installed Version
# xattr is /usr/bin/xattr # Mac OSX Installed Version
So in one of the example's where -c will not work in xargs is because in bash you default to the non-python version.
Works with -c
/usr/bin/xattr -c
Does NOT Work with -c
/usr/local/bin/xattr -c
# option -c not recognized
My Shell/Terminal defaults to /usr/local/bin/xattr because my $PATH
/usr/local/bin: is before /usr/bin: which I believe is the default.
I can prove this because, if you try to uninstall the python xattr you will see:
pip3 uninstall xattr
Uninstalling xattr-0.9.6:
Would remove:
/usr/local/bin/xattr
/usr/local/lib/python3.7/site-packages/xattr-0.9.6.dist-info/*
/usr/local/lib/python3.7/site-packages/xattr/*
Proceed (y/n)?
Workarounds
To Fix option -c not recognized Errors.
- Uninstall any Python
xattryou may have:pip3 uninstall xattr - Close all
Terminalwindows & quitTerminal - Reopen a new
Terminalwindow. - ReRun
xattrcommand and it should now work.
OR
If you want to keep the Python
xattrthen use
/usr/bin/xattr
for any Shell commands in Terminal
Example:
Python's version of xattr doesn't handle images at all:
Good-Mac:~ JayRizzo$ xattr ~/Desktop/screenshot\ 2019-10-23\ at\ 010212.png
# com.apple.FinderInfo
# Traceback (most recent call last):
# File "/usr/local/bin/xattr", line 8, in <module>
# sys.exit(main())
# File "/usr/local/lib/python3.7/site-packages/xattr/tool.py", line 196, in main
# attr_value = attr_value.decode('utf-8')
# UnicodeDecodeError: 'utf-8' codec can't decode byte 0xb0 in position 2: invalid start byte
Good-Mac:~ JayRizzo$ /usr/bin/xattr ~/Desktop/screenshot\ 2019-10-23\ at\ 010212.png
# com.apple.FinderInfo
# com.apple.lastuseddate#PS
# com.apple.metadata:kMDItemIsScreenCapture
# com.apple.metadata:kMDItemScreenCaptureGlobalRect
# com.apple.metadata:kMDItemScreenCaptureType
Man Pages
MAN PAGE for Python xattr VERSION 0.6.4
NOTE: I could not find the python help page for current VERSION 0.9.6
Thanks for Reading!
Extract file basename without path and extension in bash
A combination of basename and cut works fine, even in case of double ending like .tar.gz:
fbname=$(basename "$fullfile" | cut -d. -f1)
Would be interesting if this solution needs less arithmetic power than Bash Parameter Expansion.
How to get folder path from file path with CMD
In order to assign these to variables, be sure not to add spaces in front or after the equals sign:
set filepath=%~dp1
set filename=%~nx1
Then you should have no issues.
How do I make curl ignore the proxy?
First, I listed the current proxy setting with
env | sort | less
(should be something like http_proxy=http://wpad.local.machine.location:port number)
Then I tried setting
export http_proxy=";"
which gave this error message:
curl: (5) Couldn't resolve proxy ';'
Tried
export http_proxy="" && curl http://servername:portnumber/destinationpath/ -d 55
and it worked!
PS! Remember to set http-proxy back to its original settings with
export http_proxy=http://wpad.local.machine.location:port number
how to put focus on TextBox when the form load?
Set Tabstop to True and TabIndex to the minimum to the control on which you need focus.
e.g. If you have 2 TextBoxes : TextBox1 and TextBox2, set Tabstop to True for both and TabIndex to 0 and 1 respectively. When the form loads, the focus will be on TextBox1 and on the press of 'Tab' key, the focus will move to TextBox2.
How to remove Firefox's dotted outline on BUTTONS as well as links?
button::-moz-focus-inner {
border: 0;
}
how to generate a unique token which expires after 24 hours?
I like Guffa's answer and since I can't comment I will provide the answer Udil's question here.
I needed something similar but I wanted certein logic in my token, I wanted to:
- See the expiration of a token
- Use a guid to mask validate (global application guid or user guid)
- See if the token was provided for the purpose I created it (no reuse..)
- See if the user I send the token to is the user that I am validating it for
Now points 1-3 are fixed length so it was easy, here is my code:
Here is my code to generate the token:
public string GenerateToken(string reason, MyUser user)
{
byte[] _time = BitConverter.GetBytes(DateTime.UtcNow.ToBinary());
byte[] _key = Guid.Parse(user.SecurityStamp).ToByteArray();
byte[] _Id = GetBytes(user.Id.ToString());
byte[] _reason = GetBytes(reason);
byte[] data = new byte[_time.Length + _key.Length + _reason.Length+_Id.Length];
System.Buffer.BlockCopy(_time, 0, data, 0, _time.Length);
System.Buffer.BlockCopy(_key , 0, data, _time.Length, _key.Length);
System.Buffer.BlockCopy(_reason, 0, data, _time.Length + _key.Length, _reason.Length);
System.Buffer.BlockCopy(_Id, 0, data, _time.Length + _key.Length + _reason.Length, _Id.Length);
return Convert.ToBase64String(data.ToArray());
}
Here is my Code to take the generated token string and validate it:
public TokenValidation ValidateToken(string reason, MyUser user, string token)
{
var result = new TokenValidation();
byte[] data = Convert.FromBase64String(token);
byte[] _time = data.Take(8).ToArray();
byte[] _key = data.Skip(8).Take(16).ToArray();
byte[] _reason = data.Skip(24).Take(2).ToArray();
byte[] _Id = data.Skip(26).ToArray();
DateTime when = DateTime.FromBinary(BitConverter.ToInt64(_time, 0));
if (when < DateTime.UtcNow.AddHours(-24))
{
result.Errors.Add( TokenValidationStatus.Expired);
}
Guid gKey = new Guid(_key);
if (gKey.ToString() != user.SecurityStamp)
{
result.Errors.Add(TokenValidationStatus.WrongGuid);
}
if (reason != GetString(_reason))
{
result.Errors.Add(TokenValidationStatus.WrongPurpose);
}
if (user.Id.ToString() != GetString(_Id))
{
result.Errors.Add(TokenValidationStatus.WrongUser);
}
return result;
}
private static string GetString(byte[] reason) => Encoding.ASCII.GetString(reason);
private static byte[] GetBytes(string reason) => Encoding.ASCII.GetBytes(reason);
The TokenValidation class looks like this:
public class TokenValidation
{
public bool Validated { get { return Errors.Count == 0; } }
public readonly List<TokenValidationStatus> Errors = new List<TokenValidationStatus>();
}
public enum TokenValidationStatus
{
Expired,
WrongUser,
WrongPurpose,
WrongGuid
}
Now I have an easy way to validate a token, no Need to Keep it in a list for 24 hours or so. Here is my Good-Case Unit test:
private const string ResetPasswordTokenPurpose = "RP";
private const string ConfirmEmailTokenPurpose = "EC";//change here change bit length for reason section (2 per char)
[TestMethod]
public void GenerateTokenTest()
{
MyUser user = CreateTestUser("name");
user.Id = 123;
user.SecurityStamp = Guid.NewGuid().ToString();
var token = sit.GenerateToken(ConfirmEmailTokenPurpose, user);
var validation = sit.ValidateToken(ConfirmEmailTokenPurpose, user, token);
Assert.IsTrue(validation.Validated,"Token validated for user 123");
}
One can adapt the code for other business cases easely.
Happy Coding
Walter
Unable to make the session state request to the session state server
Not the best answer, but it's an option anyway:
Comment the given line in the web.config.
"Could not run curl-config: [Errno 2] No such file or directory" when installing pycurl
On Debian I needed the following packages to fix this
sudo apt install libcurl4-openssl-dev libssl-dev
How to replace negative numbers in Pandas Data Frame by zero
Perhaps you could use pandas.where(args) like so:
data_frame = data_frame.where(data_frame < 0, 0)
Group by month and year in MySQL
SELECT MONTHNAME(t.summaryDateTime) as month, YEAR(t.summaryDateTime) as year
FROM trading_summary t
GROUP BY YEAR(t.summaryDateTime) DESC, MONTH(t.summaryDateTime) DESC
Should use DESC for both YEAR and Month to get correct order.
apache mod_rewrite is not working or not enabled
It's working.
my solution is:
1.create a test.conf into /etc/httpd/conf.d/test.conf
2.wrote some rule, like:
<Directory "/var/www/html/test">
RewriteEngine On
RewriteRule ^link([^/]*).html$ rewrite.php?link=$1 [L]
</Directory>
3.restart your Apache server.
4.try again yourself.
Saving any file to in the database, just convert it to a byte array?
What database are you using? normally you don't save files to a database but i think sql 2008 has support for it...
A file is binary data hence UTF 8 does not matter here..
UTF 8 matters when you try to convert a string to a byte array... not a file to byte array.
Get key by value in dictionary
Here is a solution which works both in Python 2 and Python 3:
dict((v, k) for k, v in list.items())[search_age]
The part until [search_age] constructs the reverse dictionary (where values are keys and vice-versa).
You could create a helper method which will cache this reversed dictionary like so:
def find_name(age, _rev_lookup=dict((v, k) for k, v in ages_by_name.items())):
return _rev_lookup[age]
or even more generally a factory which would create a by-age name lookup method for one or more of you lists
def create_name_finder(ages_by_name):
names_by_age = dict((v, k) for k, v in ages_by_name.items())
def find_name(age):
return names_by_age[age]
so you would be able to do:
find_teen_by_age = create_name_finder({'george':16,'amber':19})
...
find_teen_by_age(search_age)
Note that I renamed list to ages_by_name since the former is a predefined type.
How to calculate difference between two dates in oracle 11g SQL
basically the to_char(sysdate,'DDD') returns no of days from 1-jan-yyyy to sysdate so that if subtract two dates it will return that,you will get difference between two dates
select to_char(sysdate,'DDD') -to_char(to_date('19-08-1995','dd-mm-yyyy'),'DDD') from dual;
When increasing the size of VARCHAR column on a large table could there be any problems?
Just wanted to add my 2 cents, since I googled this question b/c I found myself in a similar situation...
BE AWARE that while changing from varchar(xxx) to varchar(yyy) is a meta-data change indeed, but changing to varchar(max) is not. Because varchar(max) values (aka BLOB values - image/text etc) are stored differently on the disk, not within a table row, but "out of row". So the server will go nuts on a big table and become unresponsive for minutes (hours).
--no downtime
ALTER TABLE MyTable ALTER COLUMN [MyColumn] VARCHAR(1200)
--huge downtime
ALTER TABLE MyTable ALTER COLUMN [MyColumn] VARCHAR(max)
PS. same applies to nvarchar or course.
From Now() to Current_timestamp in Postgresql
Here is what the MySQL docs say about NOW():
Returns the current date and time as a value in
YYYY-MM-DD HH:MM:SSorYYYYMMDDHHMMSS.uuuuuuformat, depending on whether the function is used in a string or numeric context. The value is expressed in the current time zone.
mysql> SELECT NOW();
-> '2007-12-15 23:50:26'
mysql> SELECT NOW() + 0;
-> 20071215235026.000000
Now, you can certainly reduce your smart date to something less...
SELECT (
date_part('year', NOW())::text
|| date_part('month', NOW())::text
|| date_part('day', NOW())::text
|| date_part('hour', NOW())::text
|| date_part('minute', NOW())::text
|| date_part('second', NOW())::text
)::float8 + foo;
But, that would be a really bad idea, what you need to understand is that times and dates are not stupid unformated numbers, they are their own type with their own set of functions and operators
So the MySQL time essentially lets you treat NOW() as a dumber type, or it overrides + to make a presumption that I can't find in the MySQL docs. Eitherway, you probably want to look at the date and interval types in pg.
redistributable offline .NET Framework 3.5 installer for Windows 8
You don't have to copy everything to C:\dotnet35. Usually all the files are already copied to the folder C:\Windows\WinSxS. Then the command becomes (assuming Windows was installed to C:): "Dism.exe /online /enable-feature /featurename:NetFX3 /All /Source:C:\Windows\WinSxS /LimitAccess" If not you can also point the command to the DVD directly. Then the command becomes (assuming DVD is mounted to D:): "Dism.exe /online /enable-feature /featurename:NetFX3 /All /Source:D:\sources\sxs /LimitAccess".
R memory management / cannot allocate vector of size n Mb
I followed to the help page of memory.limit and found out that on my computer R by default can use up to ~ 1.5 GB of RAM and that the user can increase this limit. Using the following code,
>memory.limit()
[1] 1535.875
> memory.limit(size=1800)
helped me to solve my problem.
What exactly does the "u" do? "git push -u origin master" vs "git push origin master"
git push -u origin master
… is the same as:
git push origin master ; git branch --set-upstream master origin/master
Do the last statement, if you forget the -u!
Or you could force it:
git config branch.master.remote origin
git config branch.master.merge refs/heads/master
If you let the command do it for you, it will pick your mistakes like if you typed a non-existent branch or you didn't git remote add; though that might be what you want. :)
Calculate correlation with cor(), only for numerical columns
I found an easier way by looking at the R script generated by Rattle. It looks like below:
correlations <- cor(mydata[,c(1,3,5:87,89:90,94:98)], use="pairwise", method="spearman")
Can you Run Xcode in Linux?
The low-level toolchain for Xcode (the gcc compiler family, the gdb debugger, etc.) is all open source and common to Unix and Linux platforms. But the IDE--the editor, project management, indexing, navigation, build system, graphical debugger, visual data modeling, SCM system, refactoring, project snapshots, etc.--is a Mac OS X Cocoa application, and is not portable.
How to let PHP to create subdomain automatically for each user?
In addition to configuration changes on your WWW server to handle the new subdomain, your code would need to be making changes to your DNS records. So, unless you're running your own BIND (or similar), you'll need to figure out how to access your name server provider's configuration. If they don't offer some sort of API, this might get tricky.
Update: yes, I would check with your registrar if they're also providing the name server service (as is often the case). I've never explored this option before but I suspect most of the consumer registrars do not. I Googled for GoDaddy APIs and GoDaddy DNS APIs but wasn't able to turn anything up, so I guess the best option would be to check out the online help with your provider, and if that doesn't answer the question, get a hold of their support staff.
Convert to/from DateTime and Time in Ruby
Unfortunately, the DateTime.to_time, Time.to_datetime and Time.parse functions don't retain the timezone info. Everything is converted to local timezone during conversion. Date arithmetics still work but you won't be able to display the dates with their original timezones. That context information is often important. For example, if I want to see transactions performed during business hours in New York I probably prefer to see them displayed in their original timezones, not my local timezone in Australia (which 12 hrs ahead of New York).
The conversion methods below do keep that tz info.
For Ruby 1.8, look at Gordon Wilson's answer. It's from the good old reliable Ruby Cookbook.
For Ruby 1.9, it's slightly easier.
require 'date'
# Create a date in some foreign time zone (middle of the Atlantic)
d = DateTime.new(2010,01,01, 10,00,00, Rational(-2, 24))
puts d
# Convert DateTime to Time, keeping the original timezone
t = Time.new(d.year, d.month, d.day, d.hour, d.min, d.sec, d.zone)
puts t
# Convert Time to DateTime, keeping the original timezone
d = DateTime.new(t.year, t.month, t.day, t.hour, t.min, t.sec, Rational(t.gmt_offset / 3600, 24))
puts d
This prints the following
2010-01-01T10:00:00-02:00
2010-01-01 10:00:00 -0200
2010-01-01T10:00:00-02:00
The full original DateTime info including timezone is kept.
how to add script inside a php code?
You can insert script to HTML like in any other (non-PHP) page, PHP processes it like any other code:
<button id="butt">
? Click ME! ?
</button>
<script>
document.getElementById("butt").onclick = function () {
alert("Message");
}
</script>
You can use onSOMETHING attributes:
<button onclick="alert('Message')">Button</button>
To generate message in PHP, use json_encode function (it can convert to JavaScript everything that can be expressed in JSON — arrays, objects, strings, …):
<?php $message = "Your message variable"; ?>
<button onclick="alert(<?=htmlspecialchars(json_encode($message), ENT_QUOTES)?>)">Click me!</button>
If you generate code for <script> tags, do NOT use htmlspecialchars or similar function:
<?php $var = "Test string"; ?>
<button id="butt">Button</button>
<script>
document.getElementById("butt").onclick = function () {
alert(<?=json_encode($var)?>);
}
</script>
You can generate whole JavaScript files, not only JavaScript embedded into HTML. You still have to name them with .php extension (like script.php). Just send the correct header.
script.php – The JavaScript file
<?php header("Content-Type: application/javascript"); /* This meant the file can be used in script tag */ ?>
<?php $var = "Message"; ?>
document.getElementById("butt").onclick = function () {
alert(<?=json_encode($var)?>);
}
index.html – Example page that uses script.php
<!doctype html>
<html lang=en>
<head>
<meta charset="utf-8">
<title>Page title</title>
</head>
<body>
<button id="butt">
BUTTON
</button>
<script src="script.js"></script>
</body>
</html>
Stretch child div height to fill parent that has dynamic height
You can do it easily with a bit of jQuery
$(document).ready(function(){
var parentHeight = $("#parentDiv").parent().height();
$("#childDiv").height(parentHeight);
});
"TypeError: (Integer) is not JSON serializable" when serializing JSON in Python?
as @JAC pointed out in the comments of the highest rated answer, the generic solution (for all numpy types) can be found in the thread Converting numpy dtypes to native python types.
Nevertheless, I´ll add my version of the solution below, as my in my case I needed a generic solution that combines these answers and with the answers of the other thread. This should work with almost all numpy types.
def convert(o):
if isinstance(o, np.generic): return o.item()
raise TypeError
json.dumps({'value': numpy.int64(42)}, default=convert)
JQuery, setTimeout not working
SetTimeout is used to make your set of code to execute after a specified time period so for your requirements its better to use setInterval because that will call your function every time at a specified time interval.
getting the difference between date in days in java
Use JodaTime for this. It is much better than the standard Java DateTime Apis. Here is the code in JodaTime for calculating difference in days:
private static void dateDiff() {
System.out.println("Calculate difference between two dates");
System.out.println("=================================================================");
DateTime startDate = new DateTime(2000, 1, 19, 0, 0, 0, 0);
DateTime endDate = new DateTime();
Days d = Days.daysBetween(startDate, endDate);
int days = d.getDays();
System.out.println(" Difference between " + endDate);
System.out.println(" and " + startDate + " is " + days + " days.");
}
Is there a program to decompile Delphi?
I don't think there are any machine code decompilers that produce Pascal code. Most "Delphi decompilers" parse form and RTTI data, but do not actually decompile the machine code. I can only recommend using something like DeDe (or similar software) to extract symbol information in combination with a C decompiler, then translate the decompiled C code to Delphi (there are many source code converters out there).
Find element in List<> that contains a value
I would use .Equals() for comparison instead of ==.
Like so:
MyClass item = MyList.Find(item => item.name.Equals("foo"));
Particularly because it gives you options like StringComparison, which is awesome. Example:
MyClass item = MyList.Find(item => item.name.Equals("foo", StringComparison.InvariantCultureIgnoreCase);
This enables your code to ignore special characters, upper and lower case. There are more options.
Using CSS to insert text
It is, but requires a CSS2 capable browser (all major browsers, IE8+).
.OwnerJoe:before {
content: "Joe's Task:";
}
But I would rather recommend using Javascript for this. With jQuery:
$('.OwnerJoe').each(function() {
$(this).before($('<span>').text("Joe's Task: "));
});
Removing display of row names from data frame
Recently I had the same problem when using htmlTable() (‘htmlTable’ package) and I found a simpler solution: convert the data frame to a matrix with as.matrix():
htmlTable(as.matrix(df))
And be sure that the rownames are just indices. as.matrix() conservs the same columnames. That's it.
UPDATE
Following the comment of @DMR, I did't notice that htmlTable() has the parameter rnames = FALSE for cases like this. So a better answer would be:
htmlTable(df, rnames = FALSE)
Resize Cross Domain Iframe Height
Minimum crossdomain set I've used for embedding fitted single iframe on a page.
On embedding page (containing iframe):
<iframe frameborder="0" id="sizetracker" src="http://www.hurtta.com/Services/SizeTracker/DE" width="100%"></iframe>
<script type="text/javascript">
// Create browser compatible event handler.
var eventMethod = window.addEventListener ? "addEventListener" : "attachEvent";
var eventer = window[eventMethod];
var messageEvent = eventMethod == "attachEvent" ? "onmessage" : "message";
// Listen for a message from the iframe.
eventer(messageEvent, function(e) {
if (isNaN(e.data)) return;
// replace #sizetracker with what ever what ever iframe id you need
document.getElementById('sizetracker').style.height = e.data + 'px';
}, false);
</script>
On embedded page (iframe):
<script type="text/javascript">
function sendHeight()
{
if(parent.postMessage)
{
// replace #wrapper with element that contains
// actual page content
var height= document.getElementById('wrapper').offsetHeight;
parent.postMessage(height, '*');
}
}
// Create browser compatible event handler.
var eventMethod = window.addEventListener ? "addEventListener" : "attachEvent";
var eventer = window[eventMethod];
var messageEvent = eventMethod == "attachEvent" ? "onmessage" : "message";
// Listen for a message from the iframe.
eventer(messageEvent, function(e) {
if (isNaN(e.data)) return;
sendHeight();
},
false);
</script>
Android Stop Emulator from Command Line
To stop all running emulators we use this command:
adb devices | grep emulator | cut -f1 | while read line; do adb -s $line emu kill; done
Java: Calculating the angle between two points in degrees
you could add the following:
public float getAngle(Point target) {
float angle = (float) Math.toDegrees(Math.atan2(target.y - y, target.x - x));
if(angle < 0){
angle += 360;
}
return angle;
}
by the way, why do you want to not use a double here?
console.log showing contents of array object
console.log does not produce any message box. I don't think it is available in any version of IE (nor Firefox) without the addition of firebug or some equivalent.
It is however available in Safari and Chrome. Since you mention Chrome I'll use that for my example.
You'll need to open your window and its developer window counterpart. you can do this by right clicking any element on the page and selecting "Inspect element". your window will be divided in two parts, the developer part being the bottom. in the division between the two parts is a bar with buttons and the rightmost button there is labeled "console". You'll need to click that to switch to the console tab. Press F12 for developer tools in most browsers on Windows, command + shift + I on macOS.
Once there, you will be able to interact with whatever page is loaded on top through javascript from that console, and any messages you console.log will be displayed there.
final keyword in method parameters
There is a circumstance where you're required to declare it final --otherwise it will result in compile error--, namely passing them through into anonymous classes. Basic example:
public FileFilter createFileExtensionFilter(final String extension) {
FileFilter fileFilter = new FileFilter() {
public boolean accept(File pathname) {
return pathname.getName().endsWith(extension);
}
};
// What would happen when it's allowed to change extension here?
// extension = "foo";
return fileFilter;
}
Removing the final modifier would result in compile error, because it isn't guaranteed anymore that the value is a runtime constant. Changing the value from outside the anonymous class would namely cause the anonymous class instance to behave different after the moment of creation.
Capture key press without placing an input element on the page?
Detect key press, including key combinations:
window.addEventListener('keydown', function (e) {
if (e.ctrlKey && e.keyCode == 90) {
// Ctrl + z pressed
}
});
Benefit here is that you are not overwriting any global properties, but instead merely introducing a side effect. Not good, but definitely a whole lot less nefarious than other suggestions on here.
Thymeleaf: how to use conditionals to dynamically add/remove a CSS class
Yes, it is possible to change a CSS class dynamically according to the situation, but not with th:if. This is done with the elvis operator.
<a href="lorem-ipsum.html" th:class="${isAdmin}? adminclass : userclass">Lorem Ipsum</a>
Where can I find the error logs of nginx, using FastCGI and Django?
You can use lsof (list of open files) in most cases to find open log files without knowing the configuration.
Example:
Find the PID of httpd (the same concept applies for nginx and other programs):
$ ps aux | grep httpd
...
root 17970 0.0 0.3 495964 64388 ? Ssl Oct29 3:45 /usr/sbin/httpd
...
Then search for open log files using lsof with the PID:
$ lsof -p 17970 | grep log
httpd 17970 root 2w REG 253,15 2278 6723 /var/log/httpd/error_log
httpd 17970 root 12w REG 253,15 0 1387 /var/log/httpd/access_log
If lsof prints nothing, even though you expected the log files to be found, issue the same command using sudo.
You can read a little more here.
How do I specify different layouts for portrait and landscape orientations?
Create a new directory layout-land, then create xml file with same name in layout-land as it was layout directory and align there your content for Landscape mode.
Note that id of content in both xml is same.
How to copy files across computers using SSH and MAC OS X Terminal
First zip or gzip the folders:
Use the following command:
zip -r NameYouWantForZipFile.zip foldertozip/
or
tar -pvczf BackUpDirectory.tar.gz /path/to/directory
for gzip compression use SCP:
scp [email protected]:~/serverpath/public_html ~/Desktop
Insert value into a string at a certain position?
If you just want to insert a value at a certain position in a string, you can use the String.Insert method:
public string Insert(int startIndex, string value)
Example:
"abc".Insert(2, "XYZ") == "abXYZc"
Can I have multiple background images using CSS?
Current version of FF and IE and some other browsers support multiple background images in a single CSS2 declaration. Look here http://dense13.com/blog/2008/08/31/multiple-background-images-with-css2/ and here http://www.quirksmode.org/css/multiple_backgrounds.html and here http://nicolasgallagher.com/multiple-backgrounds-and-borders-with-css2/
For IE, you might consider adding a behavior. Look here: http://css3pie.com/
JQuery $.ajax() post - data in a java servlet
To get the value from the servlet from POST command, you can follow the approach as explained on this post by using request.getParameter(key) format which will return the value you want.
SQL Error: ORA-00922: missing or invalid option
The error you're getting appears to be the result of the fact that there is no underscore between "chartered" and "flight" in the table name. I assume you want something like this where the name of the table is chartered_flight.
CREATE TABLE chartered_flight(flight_no NUMBER(4) PRIMARY KEY
, customer_id NUMBER(6) REFERENCES customer(customer_id)
, aircraft_no NUMBER(4) REFERENCES aircraft(aircraft_no)
, flight_type VARCHAR2 (12)
, flight_date DATE NOT NULL
, flight_time INTERVAL DAY TO SECOND NOT NULL
, takeoff_at CHAR (3) NOT NULL
, destination CHAR (3) NOT NULL)
Generally, there is no benefit to declaring a column as CHAR(3) rather than VARCHAR2(3). Declaring a column as CHAR(3) doesn't force there to be three characters of (useful) data. It just tells Oracle to space-pad data with fewer than three characters to three characters. That is unlikely to be helpful if someone inadvertently enters an incorrect code. Potentially, you could declare the column as VARCHAR2(3) and then add a CHECK constraint that LENGTH(takeoff_at) = 3.
CREATE TABLE chartered_flight(flight_no NUMBER(4) PRIMARY KEY
, customer_id NUMBER(6) REFERENCES customer(customer_id)
, aircraft_no NUMBER(4) REFERENCES aircraft(aircraft_no)
, flight_type VARCHAR2 (12)
, flight_date DATE NOT NULL
, flight_time INTERVAL DAY TO SECOND NOT NULL
, takeoff_at CHAR (3) NOT NULL CHECK( length( takeoff_at ) = 3 )
, destination CHAR (3) NOT NULL CHECK( length( destination ) = 3 )
)
Since both takeoff_at and destination are airport codes, you really ought to have a separate table of valid airport codes and define foreign key constraints between the chartered_flight table and this new airport_code table. That ensures that only valid airport codes are added and makes it much easier in the future if an airport code changes.
And from a naming convention standpoint, since both takeoff_at and destination are airport codes, I would suggest that the names be complementary and indicate that fact. Something like departure_airport_code and arrival_airport_code, for example, would be much more meaningful.
Connect to sqlplus in a shell script and run SQL scripts
For example:
sqlplus -s admin/password << EOF
whenever sqlerror exit sql.sqlcode;
set echo off
set heading off
@pl_script_1.sql
@pl_script_2.sql
exit;
EOF
Loading a properties file from Java package
When loading the Properties from a Class in the package com.al.common.email.templates you can use
Properties prop = new Properties();
InputStream in = getClass().getResourceAsStream("foo.properties");
prop.load(in);
in.close();
(Add all the necessary exception handling).
If your class is not in that package, you need to aquire the InputStream slightly differently:
InputStream in =
getClass().getResourceAsStream("/com/al/common/email/templates/foo.properties");
Relative paths (those without a leading '/') in getResource()/getResourceAsStream() mean that the resource will be searched relative to the directory which represents the package the class is in.
Using java.lang.String.class.getResource("foo.txt") would search for the (inexistent) file /java/lang/String/foo.txt on the classpath.
Using an absolute path (one that starts with '/') means that the current package is ignored.
Deep-Learning Nan loss reasons
If using integers as targets, makes sure they aren't symmetrical at 0.
I.e., don't use classes -1, 0, 1. Use instead 0, 1, 2.
How is CountDownLatch used in Java Multithreading?
If you add some debug after your call to latch.countDown(), this may help you understand its behaviour better.
latch.countDown();
System.out.println("DONE "+this.latch); // Add this debug
The output will show the Count being decremented. This 'count' is effectively the number of Runnable tasks (Processor objects) you've started against which countDown() has not been invoked and hence is blocked the main thread on its call to latch.await().
DONE java.util.concurrent.CountDownLatch@70e69696[Count = 2]
DONE java.util.concurrent.CountDownLatch@70e69696[Count = 1]
DONE java.util.concurrent.CountDownLatch@70e69696[Count = 0]
How to change the URL from "localhost" to something else, on a local system using wampserver?
WINDOWS + WAMP solution
Step 1
Go to C:\wamp\bin\apache\Apache2.2.17\conf\
open httpd.conf file and change #Include conf/extra/httpd-vhosts.conf
to
Include conf/extra/httpd-vhosts.conf
i.e. uncomment the line so that it can includes the virtual hosts file.
Step 2
Go to C:\wamp\bin\apache\Apache2.2.17\conf\extra
and open httpd-vhosts.conf file and add the following code
<VirtualHost myWebsite.local>
DocumentRoot "C:/wamp/www/myWebsite/"
ServerName myWebsite.local
ServerAlias myWebsite.local
<Directory "C:/wamp/www/myWebsite/">
Order allow,deny
Allow from all
</Directory>
</VirtualHost>
change myWebsite.local and C:/wamp/www/myWebsite/ as per your requirements.
Step 3
Open hosts file in C:/Windows/System32/drivers/etc/ and add the following line ( Don't delete anything )
127.0.0.1 myWebsite.local
change myWebsite.local as per your name requirements
Step 4
restart your server. That's it
WINDOWS + XAMPP solution
Same steps as that of WAMP just change the paths according to XAMPP which corresponds to path in WAMP
GROUP BY and COUNT in PostgreSQL
I think you just need COUNT(DISTINCT post_id) FROM votes.
See "4.2.7. Aggregate Expressions" section in http://www.postgresql.org/docs/current/static/sql-expressions.html.
EDIT: Corrected my careless mistake per Erwin's comment.
How to select specified node within Xpath node sets by index with Selenium?
There is no i in xpath is not entirely true. You can still use the count() to find the index.
Consider the following page
<html>_x000D_
_x000D_
<head>_x000D_
<title>HTML Sample table</title>_x000D_
</head>_x000D_
_x000D_
<style>_x000D_
table, td, th {_x000D_
border: 1px solid black;_x000D_
font-size: 15px;_x000D_
font-family: Trebuchet MS, sans-serif;_x000D_
}_x000D_
table {_x000D_
border-collapse: collapse;_x000D_
width: 100%;_x000D_
}_x000D_
_x000D_
th, td {_x000D_
text-align: left;_x000D_
padding: 8px;_x000D_
}_x000D_
_x000D_
tr:nth-child(even){background-color: #f2f2f2}_x000D_
_x000D_
th {_x000D_
background-color: #4CAF50;_x000D_
color: white;_x000D_
}_x000D_
</style>_x000D_
_x000D_
<body>_x000D_
<table>_x000D_
<thead>_x000D_
<tr>_x000D_
<th>Heading 1</th>_x000D_
<th>Heading 2</th>_x000D_
<th>Heading 3</th>_x000D_
<th>Heading 4</th>_x000D_
<th>Heading 5</th>_x000D_
<th>Heading 6</th>_x000D_
</tr>_x000D_
</thead>_x000D_
<tbody>_x000D_
<tr>_x000D_
<td>Data row 1 col 1</td>_x000D_
<td>Data row 1 col 2</td>_x000D_
<td>Data row 1 col 3</td>_x000D_
<td>Data row 1 col 4</td>_x000D_
<td>Data row 1 col 5</td>_x000D_
<td>Data row 1 col 6</td>_x000D_
</tr>_x000D_
<tr>_x000D_
<td>Data row 2 col 1</td>_x000D_
<td>Data row 2 col 2</td>_x000D_
<td>Data row 2 col 3</td>_x000D_
<td>Data row 2 col 4</td>_x000D_
<td>Data row 2 col 5</td>_x000D_
<td>Data row 2 col 6</td>_x000D_
</tr>_x000D_
<tr>_x000D_
<td>Data row 3 col 1</td>_x000D_
<td>Data row 3 col 2</td>_x000D_
<td>Data row 3 col 3</td>_x000D_
<td>Data row 3 col 4</td>_x000D_
<td>Data row 3 col 5</td>_x000D_
<td>Data row 3 col 6</td>_x000D_
</tr>_x000D_
<tr>_x000D_
<td>Data row 4 col 1</td>_x000D_
<td>Data row 4 col 2</td>_x000D_
<td>Data row 4 col 3</td>_x000D_
<td>Data row 4 col 4</td>_x000D_
<td>Data row 4 col 5</td>_x000D_
<td>Data row 4 col 6</td>_x000D_
</tr>_x000D_
<tr>_x000D_
<td>Data row 5 col 1</td>_x000D_
<td>Data row 5 col 2</td>_x000D_
<td>Data row 5 col 3</td>_x000D_
<td>Data row 5 col 4</td>_x000D_
<td>Data row 5 col 5</td>_x000D_
<td>Data row 5 col 6</td>_x000D_
</tr>_x000D_
<tr>_x000D_
<td><button>Modify</button></td>_x000D_
<td><button>Modify</button></td>_x000D_
<td><button>Modify</button></td>_x000D_
<td><button>Modify</button></td>_x000D_
<td><button>Modify</button></td>_x000D_
<td><button>Modify</button></td>_x000D_
</tr>_x000D_
</tbody>_x000D_
</table>_x000D_
_x000D_
</br>_x000D_
_x000D_
<table>_x000D_
<thead>_x000D_
<tr>_x000D_
<th>Heading 7</th>_x000D_
<th>Heading 8</th>_x000D_
<th>Heading 9</th>_x000D_
<th>Heading 10</th>_x000D_
<th>Heading 11</th>_x000D_
<th>Heading 12</th>_x000D_
</tr>_x000D_
</thead>_x000D_
<tbody>_x000D_
<tr>_x000D_
<td>Data row 1 col 1</td>_x000D_
<td>Data row 1 col 2</td>_x000D_
<td>Data row 1 col 3</td>_x000D_
<td>Data row 1 col 4</td>_x000D_
<td>Data row 1 col 5</td>_x000D_
<td>Data row 1 col 6</td>_x000D_
</tr>_x000D_
<tr>_x000D_
<td>Data row 2 col 1</td>_x000D_
<td>Data row 2 col 2</td>_x000D_
<td>Data row 2 col 3</td>_x000D_
<td>Data row 2 col 4</td>_x000D_
<td>Data row 2 col 5</td>_x000D_
<td>Data row 2 col 6</td>_x000D_
</tr>_x000D_
<tr>_x000D_
<td>Data row 3 col 1</td>_x000D_
<td>Data row 3 col 2</td>_x000D_
<td>Data row 3 col 3</td>_x000D_
<td>Data row 3 col 4</td>_x000D_
<td>Data row 3 col 5</td>_x000D_
<td>Data row 3 col 6</td>_x000D_
</tr>_x000D_
<tr>_x000D_
<td>Data row 4 col 1</td>_x000D_
<td>Data row 4 col 2</td>_x000D_
<td>Data row 4 col 3</td>_x000D_
<td>Data row 4 col 4</td>_x000D_
<td>Data row 4 col 5</td>_x000D_
<td>Data row 4 col 6</td>_x000D_
</tr>_x000D_
<tr>_x000D_
<td>Data row 5 col 1</td>_x000D_
<td>Data row 5 col 2</td>_x000D_
<td>Data row 5 col 3</td>_x000D_
<td>Data row 5 col 4</td>_x000D_
<td>Data row 5 col 5</td>_x000D_
<td>Data row 5 col 6</td>_x000D_
</tr>_x000D_
<tr>_x000D_
<td><button>Modify</button></td>_x000D_
<td><button>Modify</button></td>_x000D_
<td><button>Modify</button></td>_x000D_
<td><button>Modify</button></td>_x000D_
<td><button>Modify</button></td>_x000D_
<td><button>Modify</button></td>_x000D_
</tr>_x000D_
</tbody>_x000D_
</table>_x000D_
_x000D_
</body>_x000D_
</html>The page has 2 tables and has 6 columns each with unique column names and 6 rows with variable data. The last row has the Modify button in both the tables.
Assuming that the user has to select the 4th Modify button from the first table based on the heading
Use the xpath //th[.='Heading 4']/ancestor::thead/following-sibling::tbody/tr/td[count(//tr/th[.='Heading 4']/preceding-sibling::th)+1]/button
The count() operator comes in handy in situations like these.
Logic:
- Find the header for the
Modifybutton using//th[.='Heading 4'] - Find the index of the header column using
count(//tr/th[.='Heading 4']/preceding-sibling::th)+1
Note: Index starts at
0
Get the rows for the corresponding header using
//th[.='Heading 4']/ancestor::thead/following-sibling::tbody/tr/td[count(//tr/th[.='Heading 4']/preceding-sibling::th)+1]Get the
Modifybutton from the extracted node list using//th[.='Heading 4']/ancestor::thead/following-sibling::tbody/tr/td[count(//tr/th[.='Heading 4']/preceding-sibling::th)+1]/button
What is the @Html.DisplayFor syntax for?
Html.DisplayFor() will render the DisplayTemplate that matches the property's type.
If it can't find any, I suppose it invokes .ToString().
If you don't know about display templates, they're partial views that can be put in a DisplayTemplates folder inside the view folder associated to a controller.
Example:
If you create a view named String.cshtml inside the DisplayTemplates folder of your views folder (e.g Home, or Shared) with the following code:
@model string
@if (string.IsNullOrEmpty(Model)) {
<strong>Null string</strong>
}
else {
@Model
}
Then @Html.DisplayFor(model => model.Title) (assuming that Title is a string) will use the template and display <strong>Null string</strong> if the string is null, or empty.
How can I run a program from a batch file without leaving the console open after the program starts?
Here is my preferred solution. It is taken from an answer to a similar question.
Use a VBS Script to call the batch file:
Set WshShell = CreateObject("WScript.Shell")
WshShell.Run chr(34) & "C:\path\to\your\batchfile.bat" & Chr(34), 0
Set WshShell = Nothing
Copy the lines above to an editor and save the file with .VBS extension.
Android: set view style programmatically
Non of the provided answers are correct.
You CAN set style programatically.
Short answer is take a look at http://grepcode.com/file/repository.grepcode.com/java/ext/com.google.android/android/5.1.1_r1/android/content/Context.java#435
Long answer. Here's my snippet to set custom defined style programatically to your view:
1) Create a style in your styles.xml file
<style name="MyStyle">
<item name="customTextColor">#39445B</item>
<item name="customDividerColor">#8D5AA8</item>
</style>
Do not forget to define your custom attributes in attrs.xml file
My attrsl.xml file:
<declare-styleable name="CustomWidget">
<attr name="customTextColor" format="color" />
<attr name="customDividerColor" format="color" />
</declare-styleable>
Notice you can use any name for your styleable (my CustomWidget)
Now lets set the style to the widget Programatically Here's My simple widget:
public class StyleableWidget extends LinearLayout {
private final StyleLoader styleLoader = new StyleLoader();
private TextView textView;
private View divider;
public StyleableWidget(Context context) {
super(context);
init();
}
private void init() {
inflate(getContext(), R.layout.widget_styleable, this);
textView = (TextView) findViewById(R.id.text_view);
divider = findViewById(R.id.divider);
setOrientation(VERTICAL);
}
protected void apply(StyleLoader.StyleAttrs styleAttrs) {
textView.setTextColor(styleAttrs.textColor);
divider.setBackgroundColor(styleAttrs.dividerColor);
}
public void setStyle(@StyleRes int style) {
apply(styleLoader.load(getContext(), style));
}
}
layout:
<TextView
android:id="@+id/text_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="22sp"
android:layout_gravity="center"
android:text="@string/styleble_title" />
<View
android:id="@+id/divider"
android:layout_width="match_parent"
android:layout_height="1dp"/>
</merge>
And finally StyleLoader class implementation
public class StyleLoader {
public StyleLoader() {
}
public static class StyleAttrs {
public int textColor;
public int dividerColor;
}
public StyleAttrs load(Context context, @StyleRes int styleResId) {
final TypedArray styledAttributes = context.obtainStyledAttributes(styleResId, R.styleable.CustomWidget);
return load(styledAttributes);
}
@NonNull
private StyleAttrs load(TypedArray styledAttributes) {
StyleAttrs styleAttrs = new StyleAttrs();
try {
styleAttrs.textColor = styledAttributes.getColor(R.styleable.CustomWidget_customTextColor, 0);
styleAttrs.dividerColor = styledAttributes.getColor(R.styleable.CustomWidget_customDividerColor, 0);
} finally {
styledAttributes.recycle();
}
return styleAttrs;
}
}
You can find fully working example at https://github.com/Defuera/SetStylableProgramatically
Select method in List<t> Collection
I have used a script but to make a join, maybe I can help you
string Email = String.Join(", ", Emails.Where(i => i.Email != "").Select(i => i.Email).Distinct());
Cleaning up old remote git branches
First, what is the result of git branch -a on machine B?
Second, you have already deleted heads/devel on origin, so that's why you can't delete it from machine B.
Try
git branch -r -d origin/devel
or
git remote prune origin
or
git fetch origin --prune
and feel free to add --dry-run to the end of your git statement to see the result of running it without actually running it.
Docs for git remote prune and git branch.
Save file to specific folder with curl command
For powershell in Windows, you can add relative path + filename to --output flag:
curl -L http://github.com/GorvGoyl/Notion-Boost-browser-extension/archive/master.zip --output build_firefox/master-repo.zip
here build_firefox is relative folder.
Yii2 data provider default sorting
if you have CRUD (index) and you need set default sorting your controller for GridView, or ListView, or more... Example
public function actionIndex()
{
$searchModel = new NewsSearch();
$dataProvider = $searchModel->search(Yii::$app->request->queryParams);
// set default sorting
$dataProvider->sort->defaultOrder = ['id' => SORT_DESC];
return $this->render('index', [
'searchModel' => $searchModel,
'dataProvider' => $dataProvider,
]);
}
you need add
$dataProvider->sort->defaultOrder = ['id' => SORT_DESC];
How to view DB2 Table structure
I am using Aquadata Studio 12.0.23, which is several versions short of the newest. So your experience may be better than mine. I found that the best way to get an overview was to use the ERD generator. It took a couple of hours, since normalization was not a concept used in the design of this database almost 30 years ago. I was able to get definitions for all of the objects in a few hours, with a file for each.
How to force reloading php.ini file?
TL;DR; If you're still having trouble after restarting apache or nginx, also try restarting the php-fpm service.
The answers here don't always satisfy the requirement to force a reload of the php.ini file. On numerous occasions I've taken these steps to be rewarded with no update, only to find the solution I need after also restarting the php-fpm service. So if restarting apache or nginx doesn't trigger a php.ini update although you know the files are updated, try restarting php-fpm as well.
To restart the service:
Note: prepend sudo if not root
Using SysV Init scripts directly:
/etc/init.d/php-fpm restart # typical
/etc/init.d/php5-fpm restart # debian-style
/etc/init.d/php7.0-fpm restart # debian-style PHP 7
Using service wrapper script
service php-fpm restart # typical
service php5-fpm restart # debian-style
service php7.0-fpm restart. # debian-style PHP 7
Using Upstart (e.g. ubuntu):
restart php7.0-fpm # typical (ubuntu is debian-based) PHP 7
restart php5-fpm # typical (ubuntu is debian-based)
restart php-fpm # uncommon
Using systemd (newer servers):
systemctl restart php-fpm.service # typical
systemctl restart php5-fpm.service # uncommon
systemctl restart php7.0-fpm.service # uncommon PHP 7
Or whatever the equivalent is on your system.
The above commands taken directly from this server fault answer
Getting the first character of a string with $str[0]
It'll vary depending on resources, but you could run the script bellow and see for yourself ;)
<?php
$tests = 100000;
for ($i = 0; $i < $tests; $i++)
{
$string = md5(rand());
$position = rand(0, 31);
$start1 = microtime(true);
$char1 = $string[$position];
$end1 = microtime(true);
$time1[$i] = $end1 - $start1;
$start2 = microtime(true);
$char2 = substr($string, $position, 1);
$end2 = microtime(true);
$time2[$i] = $end2 - $start2;
$start3 = microtime(true);
$char3 = $string{$position};
$end3 = microtime(true);
$time3[$i] = $end3 - $start3;
}
$avg1 = array_sum($time1) / $tests;
echo 'the average float microtime using "array[]" is '. $avg1 . PHP_EOL;
$avg2 = array_sum($time2) / $tests;
echo 'the average float microtime using "substr()" is '. $avg2 . PHP_EOL;
$avg3 = array_sum($time3) / $tests;
echo 'the average float microtime using "array{}" is '. $avg3 . PHP_EOL;
?>
Some reference numbers (on an old CoreDuo machine)
$ php 1.php
the average float microtime using "array[]" is 1.914701461792E-6
the average float microtime using "substr()" is 2.2536706924438E-6
the average float microtime using "array{}" is 1.821768283844E-6
$ php 1.php
the average float microtime using "array[]" is 1.7251944541931E-6
the average float microtime using "substr()" is 2.0931363105774E-6
the average float microtime using "array{}" is 1.7225742340088E-6
$ php 1.php
the average float microtime using "array[]" is 1.7293763160706E-6
the average float microtime using "substr()" is 2.1037721633911E-6
the average float microtime using "array{}" is 1.7249774932861E-6
It seems that using the [] or {} operators is more or less the same.
MySQL - SELECT WHERE field IN (subquery) - Extremely slow why?
I find this to be the most efficient for finding if a value exists, logic can easily be inverted to find if a value doesn't exist (ie IS NULL);
SELECT * FROM primary_table st1
LEFT JOIN comparision_table st2 ON (st1.relevant_field = st2.relevant_field)
WHERE st2.primaryKey IS NOT NULL
*Replace relevant_field with the name of the value that you want to check exists in your table
*Replace primaryKey with the name of the primary key column on the comparison table.
Why does ++[[]][+[]]+[+[]] return the string "10"?
Step by steps of that, + turn value to a number and if you add to an empty array +[]...as it's empty and is equal to 0, it will
So from there, now look into your code, it's ++[[]][+[]]+[+[]]...
And there is plus between them ++[[]][+[]] + [+[]]
So these [+[]] will return [0] as they have an empty array which gets converted to 0 inside the other array...
So as imagine, the first value is a 2-dimensional array with one array inside... so [[]][+[]] will be equal to [[]][0] which will return []...
And at the end ++ convert it and increase it to 1...
So you can imagine, 1 + "0" will be "10"...
insert a NOT NULL column to an existing table
This worked for me, can also be "borrowed" from the design view, make changes -> right click -> generate change script.
BEGIN TRANSACTION
GO
ALTER TABLE dbo.YOURTABLE ADD
YOURCOLUMN bit NOT NULL CONSTRAINT DF_YOURTABLE_YOURCOLUMN DEFAULT 0
GO
COMMIT
What does java:comp/env/ do?
At the root context of the namespace is a binding with the name "comp", which is bound to a subtree reserved for component-related bindings. The name "comp" is short for component. There are no other bindings at the root context. However, the root context is reserved for the future expansion of the policy, specifically for naming resources that are tied not to the component itself but to other types of entities such as users or departments. For example, future policies might allow you to name users and organizations/departments by using names such as "java:user/alice" and "java:org/engineering".
In the "comp" context, there are two bindings: "env" and "UserTransaction". The name "env" is bound to a subtree that is reserved for the component's environment-related bindings, as defined by its deployment descriptor. "env" is short for environment. The J2EE recommends (but does not require) the following structure for the "env" namespace.
So the binding you did from spring or, for example, from a tomcat context descriptor go by default under java:comp/env/
For example, if your configuration is:
<bean id="someId" class="org.springframework.jndi.JndiObjectFactoryBean">
<property name="jndiName" value="foo"/>
</bean>
Then you can access it directly using:
Context ctx = new InitialContext();
DataSource ds = (DataSource)ctx.lookup("java:comp/env/foo");
or you could make an intermediate step so you don't have to specify "java:comp/env" for every resource you retrieve:
Context ctx = new InitialContext();
Context envCtx = (Context)ctx.lookup("java:comp/env");
DataSource ds = (DataSource)envCtx.lookup("foo");
What is the syntax for adding an element to a scala.collection.mutable.Map?
The point is that the first line of your codes is not what you expected.
You should use:
val map = scala.collection.mutable.Map[A,B]()
You then have multiple equivalent alternatives to add items:
scala> val map = scala.collection.mutable.Map[String,String]()
map: scala.collection.mutable.Map[String,String] = Map()
scala> map("k1") = "v1"
scala> map
res1: scala.collection.mutable.Map[String,String] = Map((k1,v1))
scala> map += "k2" -> "v2"
res2: map.type = Map((k1,v1), (k2,v2))
scala> map.put("k3", "v3")
res3: Option[String] = None
scala> map
res4: scala.collection.mutable.Map[String,String] = Map((k3,v3), (k1,v1), (k2,v2))
And starting Scala 2.13:
scala> map.addOne("k4" -> "v4")
res5: map.type = HashMap(k1 -> v1, k2 -> v2, k3 -> v3, k4 -> v4)
Prevent line-break of span element
white-space: nowrap is the correct solution but it will prevent any break in a line. If you only want to prevent line breaks between two elements it gets a bit more complicated:
<p>
<span class="text">Some text</span>
<span class="icon"></span>
</p>
To prevent breaks between the spans but to allow breaks between "Some" and "text" can be done by:
p {
white-space: nowrap;
}
.text {
white-space: normal;
}
That's good enough for Firefox. In Chrome you additionally need to replace the whitespace between the spans with an . (Removing the whitespace doesn't work.)
Button background as transparent
Selectors work only for drawables, not styles. Reference
First, to make the button background transparent use the following attribute as this will not affect the material design animations:
style="?attr/buttonBarButtonStyle"
There are many ways to style your button. Check out this tutorial.
Second, to make the text bold on pressed, use this java code:
btn.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction()) {
// When the user clicks the Button
case MotionEvent.ACTION_DOWN:
btn.setTypeface(Typeface.DEFAULT_BOLD);
break;
// When the user releases the Button
case MotionEvent.ACTION_UP:
btn.setTypeface(Typeface.DEFAULT);
break;
}
return false;
}
});
Shell script : How to cut part of a string
I pasted the contents of your example into a file named so.txt.
$ cat so.txt | awk '{ print $7 }' | cut -f2 -d"="
9
10
Explanation:
cat so.txtwill print the contents of the file tostdout.awk '{ print $7 }'will print the seventh column, i.e. the one containingid=ncut -f2 -d"="will cut the output of step #2 using=as the delimiter and get the second column (-f2)
If you'd rather get id= also, then:
$ cat so.txt | awk '{ print $7 }'
id=9
id=10
Add a new line to a text file in MS-DOS
Use the following:
echo (text here) >> (name here).txt
Ex. echo my name is jeff >> test.txt
test.txt
my name is jeff
You can use it in a script too.
How do I style radio buttons with images - laughing smiley for good, sad smiley for bad?
Faced with the same problem I created a simple jQuery plugin http://xypaul.github.io/radioimg.js/
It works using hidden radio buttons and labels containing images as shown below.
<input type="radio" style="display: none;" id="a" />
<label for="a">
<img class="" />
</label>
Rounding integer division (instead of truncating)
try using math ceil function that makes rounding up. Math Ceil !
PHP: How to get current time in hour:minute:second?
You can have both formats as an argument to the function date():
date("d-m-Y H:i:s")
Check the manual for more info : http://php.net/manual/en/function.date.php
As pointed out by @ThomasVdBerge to display minutes you need the 'i' character
Shell Script — Get all files modified after <date>
as simple as:
find . -mtime -1 | xargs tar --no-recursion -czf myfile.tgz
where find . -mtime -1 will select all the files in (recursively) current directory modified day before. you can use fractions, for example:
find . -mtime -1.5 | xargs tar --no-recursion -czf myfile.tgz
twitter bootstrap autocomplete dropdown / combobox with Knockoutjs
Bootstrap Tokenfield seems good too: http://sliptree.github.io/bootstrap-tokenfield/
How do I remove a single file from the staging area (undo git add)?
If you make changes to many tracked files but only want to stage a few of them, doing a
git add .
isn't always favorable (or recommended)- as it stages all the tracked files (some cases where you want to keep changes only to yourself and don't want to stage them to the remote repository).
nor is it ideal doing a bunch of
git add path/to/file1 path/to/file2
if you have a lot of nested directories (which is the case in most projects) - gets annoying
That's when Git GUI is helpful (probably only time I use it). Just open Git GUI, it shows staged and unstaged file sections. Select the files from the staged section that you want to unstage and press
Ctrl+U(for windows)
to unstage them.
How do you return a JSON object from a Java Servlet
Write the JSON object to the response object's output stream.
You should also set the content type as follows, which will specify what you are returning:
response.setContentType("application/json");
// Get the printwriter object from response to write the required json object to the output stream
PrintWriter out = response.getWriter();
// Assuming your json object is **jsonObject**, perform the following, it will return your json object
out.print(jsonObject);
out.flush();
How to export JSON from MongoDB using Robomongo
Expanding on Anish's answer, I wanted something I can apply to any query to automatically output all fields vs. having to define them within the print statement. It can probably be simplified but this was something quick & dirty that works great:
var cursor = db.getCollection('foo').find({}, {bar: 1, baz: 1, created_at: 1, updated_at: 1}).sort({created_at: -1, updated_at: -1});
while (cursor.hasNext()) {
var record = cursor.next();
var output = "";
for (var i in record) {
output += record[i] + ",";
};
output = output.substring(0, output.length - 1);
print(output);
}
What is the difference between int, Int16, Int32 and Int64?
According to Jeffrey Richter(one of the contributors of .NET framework development)'s book 'CLR via C#':
int is a primitive type allowed by the C# compiler, whereas Int32 is the Framework Class Library type (available across languages that abide by CLS). In fact, int translates to Int32 during compilation.
Also,
In C#, long maps to System.Int64, but in a different programming language, long could map to Int16 or Int32. In fact, C++/CLI does treat long as Int32.
In fact, most (.NET) languages won't even treat long as a keyword and won't compile code that uses it.
I have seen this author, and many standard literature on .NET preferring FCL types(i.e., Int32) to the language-specific primitive types(i.e., int), mainly on such interoperability concerns.
How to mock private method for testing using PowerMock?
I don't see a problem here. With the following code using the Mockito API, I managed to do just that :
public class CodeWithPrivateMethod {
public void meaningfulPublicApi() {
if (doTheGamble("Whatever", 1 << 3)) {
throw new RuntimeException("boom");
}
}
private boolean doTheGamble(String whatever, int binary) {
Random random = new Random(System.nanoTime());
boolean gamble = random.nextBoolean();
return gamble;
}
}
And here's the JUnit test :
import org.junit.Test;
import org.junit.runner.RunWith;
import org.powermock.api.mockito.PowerMockito;
import org.powermock.core.classloader.annotations.PrepareForTest;
import org.powermock.modules.junit4.PowerMockRunner;
import static org.mockito.Matchers.anyInt;
import static org.mockito.Matchers.anyString;
import static org.powermock.api.mockito.PowerMockito.when;
import static org.powermock.api.support.membermodification.MemberMatcher.method;
@RunWith(PowerMockRunner.class)
@PrepareForTest(CodeWithPrivateMethod.class)
public class CodeWithPrivateMethodTest {
@Test(expected = RuntimeException.class)
public void when_gambling_is_true_then_always_explode() throws Exception {
CodeWithPrivateMethod spy = PowerMockito.spy(new CodeWithPrivateMethod());
when(spy, method(CodeWithPrivateMethod.class, "doTheGamble", String.class, int.class))
.withArguments(anyString(), anyInt())
.thenReturn(true);
spy.meaningfulPublicApi();
}
}
A warning - comparison between signed and unsigned integer expressions
At the extreme ranges, an unsigned int can become larger than an int.
Therefore, the compiler generates a warning. If you are sure that this is not a problem, feel free to cast the types to the same type so the warning disappears (use C++ cast so that they are easy to spot).
Alternatively, make the variables the same type to stop the compiler from complaining.
I mean, is it possible to have a negative padding? If so then keep it as an int. Otherwise you should probably use unsigned int and let the stream catch the situations where the user types in a negative number.
How to access parameters in a RESTful POST method
Your @POST method should be accepting a JSON object instead of a string. Jersey uses JAXB to support marshaling and unmarshaling JSON objects (see the jersey docs for details). Create a class like:
@XmlRootElement
public class MyJaxBean {
@XmlElement public String param1;
@XmlElement public String param2;
}
Then your @POST method would look like the following:
@POST @Consumes("application/json")
@Path("/create")
public void create(final MyJaxBean input) {
System.out.println("param1 = " + input.param1);
System.out.println("param2 = " + input.param2);
}
This method expects to receive JSON object as the body of the HTTP POST. JAX-RS passes the content body of the HTTP message as an unannotated parameter -- input in this case. The actual message would look something like:
POST /create HTTP/1.1
Content-Type: application/json
Content-Length: 35
Host: www.example.com
{"param1":"hello","param2":"world"}
Using JSON in this way is quite common for obvious reasons. However, if you are generating or consuming it in something other than JavaScript, then you do have to be careful to properly escape the data. In JAX-RS, you would use a MessageBodyReader and MessageBodyWriter to implement this. I believe that Jersey already has implementations for the required types (e.g., Java primitives and JAXB wrapped classes) as well as for JSON. JAX-RS supports a number of other methods for passing data. These don't require the creation of a new class since the data is passed using simple argument passing.
HTML <FORM>
The parameters would be annotated using @FormParam:
@POST
@Path("/create")
public void create(@FormParam("param1") String param1,
@FormParam("param2") String param2) {
...
}
The browser will encode the form using "application/x-www-form-urlencoded". The JAX-RS runtime will take care of decoding the body and passing it to the method. Here's what you should see on the wire:
POST /create HTTP/1.1
Host: www.example.com
Content-Type: application/x-www-form-urlencoded;charset=UTF-8
Content-Length: 25
param1=hello¶m2=world
The content is URL encoded in this case.
If you do not know the names of the FormParam's you can do the following:
@POST @Consumes("application/x-www-form-urlencoded")
@Path("/create")
public void create(final MultivaluedMap<String, String> formParams) {
...
}
HTTP Headers
You can using the @HeaderParam annotation if you want to pass parameters via HTTP headers:
@POST
@Path("/create")
public void create(@HeaderParam("param1") String param1,
@HeaderParam("param2") String param2) {
...
}
Here's what the HTTP message would look like. Note that this POST does not have a body.
POST /create HTTP/1.1
Content-Length: 0
Host: www.example.com
param1: hello
param2: world
I wouldn't use this method for generalized parameter passing. It is really handy if you need to access the value of a particular HTTP header though.
HTTP Query Parameters
This method is primarily used with HTTP GETs but it is equally applicable to POSTs. It uses the @QueryParam annotation.
@POST
@Path("/create")
public void create(@QueryParam("param1") String param1,
@QueryParam("param2") String param2) {
...
}
Like the previous technique, passing parameters via the query string does not require a message body. Here's the HTTP message:
POST /create?param1=hello¶m2=world HTTP/1.1
Content-Length: 0
Host: www.example.com
You do have to be particularly careful to properly encode query parameters on the client side. Using query parameters can be problematic due to URL length restrictions enforced by some proxies as well as problems associated with encoding them.
HTTP Path Parameters
Path parameters are similar to query parameters except that they are embedded in the HTTP resource path. This method seems to be in favor today. There are impacts with respect to HTTP caching since the path is what really defines the HTTP resource. The code looks a little different than the others since the @Path annotation is modified and it uses @PathParam:
@POST
@Path("/create/{param1}/{param2}")
public void create(@PathParam("param1") String param1,
@PathParam("param2") String param2) {
...
}
The message is similar to the query parameter version except that the names of the parameters are not included anywhere in the message.
POST /create/hello/world HTTP/1.1
Content-Length: 0
Host: www.example.com
This method shares the same encoding woes that the query parameter version. Path segments are encoded differently so you do have to be careful there as well.
As you can see, there are pros and cons to each method. The choice is usually decided by your clients. If you are serving FORM-based HTML pages, then use @FormParam. If your clients are JavaScript+HTML5-based, then you will probably want to use JAXB-based serialization and JSON objects. The MessageBodyReader/Writer implementations should take care of the necessary escaping for you so that is one fewer thing that can go wrong. If your client is Java based but does not have a good XML processor (e.g., Android), then I would probably use FORM encoding since a content body is easier to generate and encode properly than URLs are. Hopefully this mini-wiki entry sheds some light on the various methods that JAX-RS supports.
Note: in the interest of full disclosure, I haven't actually used this feature of Jersey yet. We were tinkering with it since we have a number of JAXB+JAX-RS applications deployed and are moving into the mobile client space. JSON is a much better fit that XML on HTML5 or jQuery-based solutions.
batch file - counting number of files in folder and storing in a variable
This might be a bit faster:
dir /A:-D /B *.* 2>nul | find /c /v ""
`/A:-D` - filters out only non directory items (files)
`/B` - prints only file names (no need a full path request)
`*.*` - can filters out specific file names (currently - all)
`2>nul` - suppresses all error lines output to does not count them
count of entries in data frame in R
DPLYR makes this really easy.
x<-santa%>%
count(Believe)
If you wanted to count by a group; for instance, how many males v females believe, just add a group_by:
x<-santa%>%
group_by(Gender)%>%
count(Believe)
What ports does RabbitMQ use?
PORT 4369: Erlang makes use of a Port Mapper Daemon (epmd) for resolution of node names in a cluster. Nodes must be able to reach each other and the port mapper daemon for clustering to work.
PORT 35197 set by inet_dist_listen_min/max Firewalls must permit traffic in this range to pass between clustered nodes
RabbitMQ Management console:
- PORT 15672 for RabbitMQ version 3.x
- PORT 55672 for RabbitMQ pre 3.x
PORT 5672 RabbitMQ main port.
For a cluster of nodes, they must be open to each other on 35197, 4369 and 5672.
For any servers that want to use the message queue, only 5672 is required.
How to uninstall a Windows Service when there is no executable for it left on the system?
Create a copy of executables of same service and paste it on the same path of the existing service and then uninstall.
Entity Framework 6 Code first Default value
Just Overload the default constructor of Model class and pass any relevant parameter which you may or may not use. By this you can easily supply default values for attributes. Below is an example.
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace Aim.Data.Domain
{
[MetadataType(typeof(LoginModel))]
public partial class Login
{
public Login(bool status)
{
this.CreatedDate = DateTime.Now;
this.ModifiedDate = DateTime.Now;
this.Culture = "EN-US";
this.IsDefaultPassword = status;
this.IsActive = status;
this.LoginLogs = new HashSet<LoginLog>();
this.LoginLogHistories = new HashSet<LoginLogHistory>();
}
}
public class LoginModel
{
[Key]
[ScaffoldColumn(false)]
public int Id { get; set; }
[Required]
public string LoginCode { get; set; }
[Required]
public string Password { get; set; }
public string LastPassword { get; set; }
public int UserGroupId { get; set; }
public int FalseAttempt { get; set; }
public bool IsLocked { get; set; }
public int CreatedBy { get; set; }
public System.DateTime CreatedDate { get; set; }
public Nullable<int> ModifiedBy { get; set; }
public Nullable<System.DateTime> ModifiedDate { get; set; }
public string Culture { get; set; }
public virtual ICollection<LoginLog> LoginLogs { get; set; }
public virtual ICollection<LoginLogHistory> LoginLogHistories { get; set; }
}
}
How to fix "Incorrect string value" errors?
In my case ,first i've meet a '???' in my website, then i check Mysql's character set which is latin now ,so i change it into utf-8,then i restart my project ,then i got the same error with you , then i found that i forget to change the database's charset and change into utf-8, boom,it worked.
How do you make sure email you send programmatically is not automatically marked as spam?
In the UK it's also best practice to include a real physical address for your company and its registered number.
That way it's all open and honest and they're less likely to manually mark it as spam.
Execute PHP script in cron job
Automated Tasks: Cron
Cron is a time-based scheduling service in Linux / Unix-like computer operating systems. Cron job are used to schedule commands to be executed periodically. You can setup commands or scripts, which will repeatedly run at a set time. Cron is one of the most useful tool in Linux or UNIX like operating systems. The cron service (daemon) runs in the background and constantly checks the /etc/crontab file, /etc/cron./* directories. It also checks the /var/spool/cron/ directory.
Configuring Cron Tasks
In the following example, the crontab command shown below will activate the cron tasks automatically every ten minutes:
*/10 * * * * /usr/bin/php /opt/test.php
In the above sample, the */10 * * * * represents when the task should happen. The first figure represents minutes – in this case, on every "ten" minute. The other figures represent, respectively, hour, day, month and day of the week.
* is a wildcard, meaning "every time".
Start with finding out your PHP binary by typing in command line:
whereis php
The output should be something like:
php: /usr/bin/php /etc/php.ini /etc/php.d /usr/lib64/php /usr/include/php /usr/share/php /usr/share/man/man1/php.1.gz
Specify correctly the full path in your command.
Type the following command to enter cronjob:
crontab -e
To see what you got in crontab.
EDIT 1:
To exit from vim editor without saving just click:
Shift+:
And then type q!
Java - Abstract class to contain variables?
Sure.. Why not?
Abstract base classes are just a convenience to house behavior and data common to 2 or more classes in a single place for efficiency of storage and maintenance. Its an implementation detail.
Take care however that you are not using an abstract base class where you should be using an interface. Refer to Interface vs Base class
string sanitizer for filename
preg_replace("[^\w\s\d\.\-_~,;:\[\]\(\]]", '', $file)
Add/remove more valid characters depending on what is allowed for your system.
Alternatively you can try to create the file and then return an error if it's bad.
How to printf a 64-bit integer as hex?
Edit: Use printf("val = 0x%" PRIx64 "\n", val); instead.
Try printf("val = 0x%llx\n", val);. See the printf manpage:
ll (ell-ell). A following integer conversion corresponds to a long long int or unsigned long long int argument, or a following n conversion corresponds to a pointer to a long long int argument.
Edit: Even better is what @M_Oehm wrote: There is a specific macro for that, because unit64_t is not always a unsigned long long: PRIx64 see also this stackoverflow answer
Capture the Screen into a Bitmap
Bitmap memoryImage;
//Set full width, height for image
memoryImage = new Bitmap(Screen.PrimaryScreen.Bounds.Width,
Screen.PrimaryScreen.Bounds.Height,
PixelFormat.Format32bppArgb);
Size s = new Size(memoryImage.Width, memoryImage.Height);
Graphics memoryGraphics = Graphics.FromImage(memoryImage);
memoryGraphics.CopyFromScreen(0, 0, 0, 0, s);
string str = "";
try
{
str = string.Format(Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments) +
@"\Screenshot.png");//Set folder to save image
}
catch { };
memoryImage.save(str);
Remap values in pandas column with a dict
DSM has the accepted answer, but the coding doesn't seem to work for everyone. Here is one that works with the current version of pandas (0.23.4 as of 8/2018):
import pandas as pd
df = pd.DataFrame({'col1': [1, 2, 2, 3, 1],
'col2': ['negative', 'positive', 'neutral', 'neutral', 'positive']})
conversion_dict = {'negative': -1, 'neutral': 0, 'positive': 1}
df['converted_column'] = df['col2'].replace(conversion_dict)
print(df.head())
You'll see it looks like:
col1 col2 converted_column
0 1 negative -1
1 2 positive 1
2 2 neutral 0
3 3 neutral 0
4 1 positive 1
The docs for pandas.DataFrame.replace are here.
How to stop/kill a query in postgresql?
What I did is first check what are the running processes by
SELECT * FROM pg_stat_activity WHERE state = 'active';
Find the process you want to kill, then type:
SELECT pg_cancel_backend(<pid of the process>)
This basically "starts" a request to terminate gracefully, which may be satisfied after some time, though the query comes back immediately.
If the process cannot be killed, try:
SELECT pg_terminate_backend(<pid of the process>)
Node.js client for a socket.io server
That should be possible using Socket.IO-client: https://github.com/LearnBoost/socket.io-client
How to download Visual Studio Community Edition 2015 (not 2017)
The "official" way to get the vs2015 is to go to https://my.visualstudio.com/ ; join the " Visual Studio Dev Essentials" and then search the relevant file to download https://my.visualstudio.com/Downloads?q=Visual%20Studio%202015%20with%20Update%203
.NET console application as Windows service
Here is a newer way of how to turn a Console Application to a Windows Service as a Worker Service based on the latest .Net Core 3.1.
If you create a Worker Service from Visual Studio 2019 it will give you almost everything you need for creating a Windows Service out of the box, which is also what you need to change to the console application in order to convert it to a Windows Service.
Here are the changes you need to do:
Install the following NuGet packages
Install-Package Microsoft.Extensions.Hosting.WindowsServices -Version 3.1.0
Install-Package Microsoft.Extensions.Configuration.Abstractions -Version 3.1.0
Change Program.cs to have an implementation like below:
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
namespace ConsoleApp
{
class Program
{
public static void Main(string[] args)
{
CreateHostBuilder(args).UseWindowsService().Build().Run();
}
private static IHostBuilder CreateHostBuilder(string[] args) =>
Host.CreateDefaultBuilder(args)
.ConfigureServices((hostContext, services) =>
{
services.AddHostedService<Worker>();
});
}
}
and add Worker.cs where you will put the code which will be run by the service operations:
using Microsoft.Extensions.Hosting;
using System.Threading;
using System.Threading.Tasks;
namespace ConsoleApp
{
public class Worker : BackgroundService
{
protected override async Task ExecuteAsync(CancellationToken stoppingToken)
{
//do some operation
}
public override Task StartAsync(CancellationToken cancellationToken)
{
return base.StartAsync(cancellationToken);
}
public override Task StopAsync(CancellationToken cancellationToken)
{
return base.StopAsync(cancellationToken);
}
}
}
When everything is ready, and the application has built successfully, you can use sc.exe to install your console application exe as a Windows Service with the following command:
sc.exe create DemoService binpath= "path/to/your/file.exe"
accessing a variable from another class
if what you need is the width and height of the frame in the circle, why not pass the DrawFrame width and height into the DrawCircle constructor:
public DrawCircle(int w, int h){
this.w = w;
this.h = h;
diBig = 300;
diSmall = 10;
maxRad = (diBig/2) - diSmall;
xSq = 50;
ySq = 50;
xPoint = 200;
yPoint = 200;
}
you could also add a couple new methods to DrawCircle:
public void setWidth(int w)
this.w = w;
public void setHeight(int h)
this.h = h;
or even:
public void setDimension(Dimension d) {
w=d.width;
h=d.height;
}
if you go down this route, you will need to update DrawFrame to make a local var of the DrawCircle on which to call these methods.
edit:
when changing the DrawCircle constructor as described at the top of my post, dont forget to add the width and height to the call to the constructor in DrawFrame:
public class DrawFrame extends JFrame {
public DrawFrame() {
int width = 400;
int height = 400;
setTitle("Frame");
setSize(width, height);
addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
});
Container contentPane = getContentPane();
//pass in the width and height to the DrawCircle contstructor
contentPane.add(new DrawCircle(width, height));
}
}
mcrypt is deprecated, what is the alternative?
As suggested by @rqLizard, you can use openssl_encrypt/openssl_decrypt PHP functions instead which provides a much
better alternative to implement AES (The Advanced Encryption Standard) also known as Rijndael encryption.
As per the following Scott's comment at php.net:
If you're writing code to encrypt/encrypt data in 2015, you should use
openssl_encrypt()andopenssl_decrypt(). The underlying library (libmcrypt) has been abandoned since 2007, and performs far worse than OpenSSL (which leveragesAES-NIon modern processors and is cache-timing safe).Also,
MCRYPT_RIJNDAEL_256is notAES-256, it's a different variant of the Rijndael block cipher. If you wantAES-256inmcrypt, you have to useMCRYPT_RIJNDAEL_128with a 32-byte key. OpenSSL makes it more obvious which mode you are using (i.e.aes-128-cbcvsaes-256-ctr).OpenSSL also uses PKCS7 padding with CBC mode rather than mcrypt's NULL byte padding. Thus, mcrypt is more likely to make your code vulnerable to padding oracle attacks than OpenSSL.
Finally, if you are not authenticating your ciphertexts (Encrypt Then MAC), you're doing it wrong.
Further reading:
- Using Encryption and Authentication Correctly (for PHP developers).
- If You're Typing the Word MCRYPT Into Your PHP Code, You're Doing It Wrong.
Code examples
Example #1
AES Authenticated Encryption in GCM mode example for PHP 7.1+
<?php
//$key should have been previously generated in a cryptographically safe way, like openssl_random_pseudo_bytes
$plaintext = "message to be encrypted";
$cipher = "aes-128-gcm";
if (in_array($cipher, openssl_get_cipher_methods()))
{
$ivlen = openssl_cipher_iv_length($cipher);
$iv = openssl_random_pseudo_bytes($ivlen);
$ciphertext = openssl_encrypt($plaintext, $cipher, $key, $options=0, $iv, $tag);
//store $cipher, $iv, and $tag for decryption later
$original_plaintext = openssl_decrypt($ciphertext, $cipher, $key, $options=0, $iv, $tag);
echo $original_plaintext."\n";
}
?>
Example #2
AES Authenticated Encryption example for PHP 5.6+
<?php
//$key previously generated safely, ie: openssl_random_pseudo_bytes
$plaintext = "message to be encrypted";
$ivlen = openssl_cipher_iv_length($cipher="AES-128-CBC");
$iv = openssl_random_pseudo_bytes($ivlen);
$ciphertext_raw = openssl_encrypt($plaintext, $cipher, $key, $options=OPENSSL_RAW_DATA, $iv);
$hmac = hash_hmac('sha256', $ciphertext_raw, $key, $as_binary=true);
$ciphertext = base64_encode( $iv.$hmac.$ciphertext_raw );
//decrypt later....
$c = base64_decode($ciphertext);
$ivlen = openssl_cipher_iv_length($cipher="AES-128-CBC");
$iv = substr($c, 0, $ivlen);
$hmac = substr($c, $ivlen, $sha2len=32);
$ciphertext_raw = substr($c, $ivlen+$sha2len);
$original_plaintext = openssl_decrypt($ciphertext_raw, $cipher, $key, $options=OPENSSL_RAW_DATA, $iv);
$calcmac = hash_hmac('sha256', $ciphertext_raw, $key, $as_binary=true);
if (hash_equals($hmac, $calcmac))//PHP 5.6+ timing attack safe comparison
{
echo $original_plaintext."\n";
}
?>
Example #3
Based on above examples, I've changed the following code which aims at encrypting user's session id:
class Session {
/**
* Encrypts the session ID and returns it as a base 64 encoded string.
*
* @param $session_id
* @return string
*/
public function encrypt($session_id) {
// Get the MD5 hash salt as a key.
$key = $this->_getSalt();
// For an easy iv, MD5 the salt again.
$iv = $this->_getIv();
// Encrypt the session ID.
$encrypt = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $key, $session_id, MCRYPT_MODE_CBC, $iv);
// Base 64 encode the encrypted session ID.
$encryptedSessionId = base64_encode($encrypt);
// Return it.
return $encryptedSessionId;
}
/**
* Decrypts a base 64 encoded encrypted session ID back to its original form.
*
* @param $encryptedSessionId
* @return string
*/
public function decrypt($encryptedSessionId) {
// Get the MD5 hash salt as a key.
$key = $this->_getSalt();
// For an easy iv, MD5 the salt again.
$iv = $this->_getIv();
// Decode the encrypted session ID from base 64.
$decoded = base64_decode($encryptedSessionId);
// Decrypt the string.
$decryptedSessionId = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $key, $decoded, MCRYPT_MODE_CBC, $iv);
// Trim the whitespace from the end.
$session_id = rtrim($decryptedSessionId, "\0");
// Return it.
return $session_id;
}
public function _getIv() {
return md5($this->_getSalt());
}
public function _getSalt() {
return md5($this->drupal->drupalGetHashSalt());
}
}
into:
class Session {
const SESS_CIPHER = 'aes-128-cbc';
/**
* Encrypts the session ID and returns it as a base 64 encoded string.
*
* @param $session_id
* @return string
*/
public function encrypt($session_id) {
// Get the MD5 hash salt as a key.
$key = $this->_getSalt();
// For an easy iv, MD5 the salt again.
$iv = $this->_getIv();
// Encrypt the session ID.
$ciphertext = openssl_encrypt($session_id, self::SESS_CIPHER, $key, $options=OPENSSL_RAW_DATA, $iv);
// Base 64 encode the encrypted session ID.
$encryptedSessionId = base64_encode($ciphertext);
// Return it.
return $encryptedSessionId;
}
/**
* Decrypts a base 64 encoded encrypted session ID back to its original form.
*
* @param $encryptedSessionId
* @return string
*/
public function decrypt($encryptedSessionId) {
// Get the Drupal hash salt as a key.
$key = $this->_getSalt();
// Get the iv.
$iv = $this->_getIv();
// Decode the encrypted session ID from base 64.
$decoded = base64_decode($encryptedSessionId, TRUE);
// Decrypt the string.
$decryptedSessionId = openssl_decrypt($decoded, self::SESS_CIPHER, $key, $options=OPENSSL_RAW_DATA, $iv);
// Trim the whitespace from the end.
$session_id = rtrim($decryptedSessionId, '\0');
// Return it.
return $session_id;
}
public function _getIv() {
$ivlen = openssl_cipher_iv_length(self::SESS_CIPHER);
return substr(md5($this->_getSalt()), 0, $ivlen);
}
public function _getSalt() {
return $this->drupal->drupalGetHashSalt();
}
}
To clarify, above change is not a true conversion since the two encryption uses a different block size and a different encrypted data. Additionally, the default padding is different, MCRYPT_RIJNDAEL only supports non-standard null padding. @zaph
Additional notes (from the @zaph's comments):
- Rijndael 128 (
MCRYPT_RIJNDAEL_128) is equivalent to AES, however Rijndael 256 (MCRYPT_RIJNDAEL_256) is not AES-256 as the 256 specifies a block size of 256-bits, whereas AES has only one block size: 128-bits. So basically Rijndael with a block size of 256-bits (MCRYPT_RIJNDAEL_256) has been mistakenly named due to the choices by the mcrypt developers. @zaph - Rijndael with a block size of 256 may be less secure than with a block size of 128-bits because the latter has had much more reviews and uses. Secondly, interoperability is hindered in that while AES is generally available, where Rijndael with a block size of 256-bits is not.
Encryption with different block sizes for Rijndael produces different encrypted data.
For example,
MCRYPT_RIJNDAEL_256(not equivalent toAES-256) defines a different variant of the Rijndael block cipher with size of 256-bits and a key size based on the passed in key, whereaes-256-cbcis Rijndael with a block size of 128-bits with a key size of 256-bits. Therefore they're using different block sizes which produces entirely different encrypted data as mcrypt uses the number to specify the block size, where OpenSSL used the number to specify the key size (AES only has one block size of 128-bits). So basically AES is Rijndael with a block size of 128-bits and key sizes of 128, 192 and 256 bits. Therefore it's better to use AES, which is called Rijndael 128 in OpenSSL.
Starting a node.js server
Run cmd and then run node server.js. In your example, you are trying to use the REPL to run your command, which is not going to work. The ellipsis is node.js expecting more tokens before closing the current scope (you can type code in and run it on the fly here)
Subtracting time.Duration from time in Go
In response to Thomas Browne's comment, because lnmx's answer only works for subtracting a date, here is a modification of his code that works for subtracting time from a time.Time type.
package main
import (
"fmt"
"time"
)
func main() {
now := time.Now()
fmt.Println("now:", now)
count := 10
then := now.Add(time.Duration(-count) * time.Minute)
// if we had fix number of units to subtract, we can use following line instead fo above 2 lines. It does type convertion automatically.
// then := now.Add(-10 * time.Minute)
fmt.Println("10 minutes ago:", then)
}
Produces:
now: 2009-11-10 23:00:00 +0000 UTC
10 minutes ago: 2009-11-10 22:50:00 +0000 UTC
Not to mention, you can also use time.Hour or time.Second instead of time.Minute as per your needs.
Playground: https://play.golang.org/p/DzzH4SA3izp
Where is localhost folder located in Mac or Mac OS X?
The default Apache root folder (localhost/) is /Library/WebServer/Documents
Also, make sure you have the PHP5 module loaded in /etc/apache2/httpd.conf
LoadModule php5_module libexec/apache2/libphp5.so
TypeError: Object of type 'bytes' is not JSON serializable
You are creating those bytes objects yourself:
item['title'] = [t.encode('utf-8') for t in title]
item['link'] = [l.encode('utf-8') for l in link]
item['desc'] = [d.encode('utf-8') for d in desc]
items.append(item)
Each of those t.encode(), l.encode() and d.encode() calls creates a bytes string. Do not do this, leave it to the JSON format to serialise these.
Next, you are making several other errors; you are encoding too much where there is no need to. Leave it to the json module and the standard file object returned by the open() call to handle encoding.
You also don't need to convert your items list to a dictionary; it'll already be an object that can be JSON encoded directly:
class W3SchoolPipeline(object):
def __init__(self):
self.file = open('w3school_data_utf8.json', 'w', encoding='utf-8')
def process_item(self, item, spider):
line = json.dumps(item) + '\n'
self.file.write(line)
return item
I'm guessing you followed a tutorial that assumed Python 2, you are using Python 3 instead. I strongly suggest you find a different tutorial; not only is it written for an outdated version of Python, if it is advocating line.decode('unicode_escape') it is teaching some extremely bad habits that'll lead to hard-to-track bugs. I can recommend you look at Think Python, 2nd edition for a good, free, book on learning Python 3.
Jenkins Git Plugin: How to build specific tag?
Adding my two cents here since I have not seen an answer that uses the option "Build with parameters" in Jenkins.
Here I am using Jenkins CI browser console for project starwars_api and I was able to build directly with "Build with parameters" with value refs/tags/tag-name
- choose the "build with parameters" option.
- add value in the box as "refs/tags/tag_142" (tag_name = tag_142 for my example)
How can I concatenate a string and a number in Python?
Since Python is a strongly typed language, concatenating a string and an integer as you may do in Perl makes no sense, because there's no defined way to "add" strings and numbers to each other.
Explicit is better than implicit.
...says "The Zen of Python", so you have to concatenate two string objects. You can do this by creating a string from the integer using the built-in str() function:
>>> "abc" + str(9)
'abc9'
Alternatively use Python's string formatting operations:
>>> 'abc%d' % 9
'abc9'
Perhaps better still, use str.format():
>>> 'abc{0}'.format(9)
'abc9'
The Zen also says:
There should be one-- and preferably only one --obvious way to do it.
Which is why I've given three options. It goes on to say...
Although that way may not be obvious at first unless you're Dutch.
Android Endless List
Here is a solution that also makes it easy to show a loading view in the end of the ListView while it's loading.
You can see the classes here:
https://github.com/CyberEagle/OpenProjects/blob/master/android-projects/widgets/src/main/java/br/com/cybereagle/androidwidgets/helper/ListViewWithLoadingIndicatorHelper.java - Helper to make it possible to use the features without extending from SimpleListViewWithLoadingIndicator.
https://github.com/CyberEagle/OpenProjects/blob/master/android-projects/widgets/src/main/java/br/com/cybereagle/androidwidgets/listener/EndlessScrollListener.java - Listener that starts loading data when the user is about to reach the bottom of the ListView.
https://github.com/CyberEagle/OpenProjects/blob/master/android-projects/widgets/src/main/java/br/com/cybereagle/androidwidgets/view/SimpleListViewWithLoadingIndicator.java - The EndlessListView. You can use this class directly or extend from it.
Load local JSON file into variable
My solution, as answered here, is to use:
var json = require('./data.json'); //with path
The file is loaded only once, further requests use cache.
edit To avoid caching, here's the helper function from this blogpost given in the comments, using the fs module:
var readJson = (path, cb) => {
fs.readFile(require.resolve(path), (err, data) => {
if (err)
cb(err)
else
cb(null, JSON.parse(data))
})
}
How to change the status bar color in Android?
change the colorPrimaryDark to your desire color into the res/values/styles.xml file
<resources>
<color name="colorPrimary">#800000</color>
<color name="colorPrimaryDark">#303F9F</color> //This Line
<color name="colorAccent">#FF4081</color>
<color name="red">#FF0000</color>
<color name="white">#FFFFFF</color>
<color name="cream">#fffdd0</color>
<color name="burgundy">#800000</color>
</resources>
Align vertically using CSS 3
Try this also work perfectly:
html:
<body>
<div id="my-div"></div>
</body>
css:
#my-div {
position: absolute;
height: 100px;
width: 100px;
left: 50%;
top: 50%;
background: red;
display: table-cell;
vertical-align: middle
}
How to check if a json key exists?
A better way, instead of using a conditional like:
if (json.has("club")) {
String club = json.getString("club"));
}
is to simply use the existing method optString(), like this:
String club = json.optString("club);
the optString("key") method will return an empty String if the key does not exist and won't, therefore, throw you an exception.
What does principal end of an association means in 1:1 relationship in Entity framework
In one-to-one relation one end must be principal and second end must be dependent. Principal end is the one which will be inserted first and which can exist without the dependent one. Dependent end is the one which must be inserted after the principal because it has foreign key to the principal.
In case of entity framework FK in dependent must also be its PK so in your case you should use:
public class Boo
{
[Key, ForeignKey("Foo")]
public string BooId{get;set;}
public Foo Foo{get;set;}
}
Or fluent mapping
modelBuilder.Entity<Foo>()
.HasOptional(f => f.Boo)
.WithRequired(s => s.Foo);
Clear contents and formatting of an Excel cell with a single command
Use the .Clear method.
Sheets("Test").Range("A1:C3").Clear
PHP cURL error code 60
The easiest solution to the problem is to add the below command in the field.
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER,false);
Using this will not need to add any certificate or anything.
Capture close event on Bootstrap Modal
I was having this same problem in a web app using Microsoft Visual Studio 2019, Asp.Net 3.1 and Bootstrap 4.5. I had a modal form open to add a new staff person (only a few input fields) and the Add Staff button would invoke an ajax call to create the staff records in the database. Upon successful return the code would refresh the partial razor page of staff (so the new staff person would appear in the list).
Just before the refresh I would close the Add Staff modal and display a Please Wait modal which only had a bootstrap spinner button on it. What happened is that the Please Wait modal would stay displayed and not close after the staff refresh and the modal('hide') function on this modal was called. Some times the modal would disappear but the modal backdrop would remain effectively locking the Staff List form.
Since Bootstrap has issues with multiple modals open at once, I thought maybe the Add Staff modal was still open when the Please Wait modal was displayed and this was causing problems. I made a function to display the Please Wait modal and do the refresh, and called it using the Javascript function setTimeout() to wait 1/2 second after closing/hiding the Add Staff modal:
//hide the modal form
$("#addNewStaffModal").modal('hide');
setTimeout(RefreshStaffListAfterAddingStaff, 500); //wait for 1/2 second
Here is the code for the refresh function:
function RefreshStaffListAfterAddingStaff() {
// refresh the staff list in our partial view
//show the please wait message
$('#PleaseWaitModal').modal('show');
//refresh the partial view
$('#StaffAccountsPartialView').load('StaffAccounts?handler=StaffAccountsPartial',
function (data, status, jqXGR) {
//hide the wait modal
$('#PleaseWaitModal').modal('hide');
// enable all the fields on our form
$("#StaffAccountsForm :input").prop("disabled", false);
//scroll to the top of the staff list window
window.scroll({
top: 0,
left: 0,
behavior: 'smooth'
});
});
}
This seems to have totally solved my problem!
jQuery-UI datepicker default date
$("#birthdate" ).datepicker("setDate", new Date(1985,01,01))
What are the correct version numbers for C#?
VERSION_____LANGUAGE SPECIFICATION______MICROSOFT COMPILER
C# 1.0/1.2____December 2001?/2003?___________January 2002?
C# 2.0_______September 2005________________November 2005?
C# 3.0_______May 2006_____________________November 2006?
C# 4.0_______March 2009 (draft)______________April 2010?
C# 5.0; released with .NET 4.5 in August 2012
C# 6.0; released with .NET 4.6 2015
C# 7.0; released with .NET 4.7 2017
C# 8.0; released with .NET 4.8 2019
Bold black cursor in Eclipse deletes code, and I don't know how to get rid of it
This issue can happen not only in eclipse but also in any of the text-editor.
On windows systems, windows-10 in my case, this issue arose when the shift and insert key was pressed in tandem unintentionally which takes the user to the overwrite mode.
To get back to insert mode you need to press shift and insert in tandem again.
Batch Renaming of Files in a Directory
as to me in my directory I have multiple subdir, each subdir has lots of images I want to change all the subdir images to 1.jpg ~ n.jpg
def batch_rename():
base_dir = 'F:/ad_samples/test_samples/'
sub_dir_list = glob.glob(base_dir + '*')
# print sub_dir_list # like that ['F:/dir1', 'F:/dir2']
for dir_item in sub_dir_list:
files = glob.glob(dir_item + '/*.jpg')
i = 0
for f in files:
os.rename(f, os.path.join(dir_item, str(i) + '.jpg'))
i += 1
(mys own answer)https://stackoverflow.com/a/45734381/6329006
Observable.of is not a function
Somehow even Webstorm made it like this import {of} from 'rxjs/observable/of';
and everything started to work
How to delete a whole folder and content?
Here is a non-recursive implementation, just for fun:
/**
* Deletes the given folder and all its files / subfolders.
* Is not implemented in a recursive way. The "Recursively" in the name stems from the filesystem command
* @param root The folder to delete recursively
*/
public static void deleteRecursively(final File root) {
LinkedList<File> deletionQueue = new LinkedList<>();
deletionQueue.add(root);
while(!deletionQueue.isEmpty()) {
final File toDelete = deletionQueue.removeFirst();
final File[] children = toDelete.listFiles();
if(children == null || children.length == 0) {
// This is either a file or an empty directory -> deletion possible
toDelete.delete();
} else {
// Add the children before the folder because they have to be deleted first
deletionQueue.addAll(Arrays.asList(children));
// Add the folder again because we can't delete it yet.
deletionQueue.addLast(toDelete);
}
}
}
PostgreSQL 'NOT IN' and subquery
When using NOT IN you should ensure that none of the values are NULL:
SELECT mac, creation_date
FROM logs
WHERE logs_type_id=11
AND mac NOT IN (
SELECT mac
FROM consols
WHERE mac IS NOT NULL -- add this
)
Responsive Google Map?
in the iframe tag, you can easily add width='100%' instead of the preset value giving to you by the map
like this:
<iframe src="https://www.google.com/maps/embed?anyLocation" width="100%" height="400" frameborder="0" style="border:0;" allowfullscreen=""></iframe>
How to open a new HTML page using jQuery?
You need to use ajax.
http://api.jquery.com/jQuery.ajax/
<code>
$.ajax({
url: 'ajax/test.html',
success: function(data) {
$('.result').html(data);
alert('Load was performed.');
}
});
</code>
How to increase size of DOSBox window?
For using DOSBox with SDL, you will need to set or change the following:
[sdl]
windowresolution=1280x960
output=opengl
Here is three options to put those settings:
Edit user's default configuration, for example, using
vi:$ dosbox -printconf /home/USERNAME/.dosbox/dosbox-0.74.conf $ vi "$(dosbox -printconf)" $ dosboxFor temporary resize, create a new configuration with the three lines above, say
newsize.conf:$ dosbox -conf newsize.confYou can use
-confto load multiple configuration and/or with-userconffor default configuration, for example:$ dosbox -userconf -conf newsize.conf [snip] --- CONFIG:Loading primary settings from config file /home/USERNAME/.dosbox/dosbox-0.74.conf CONFIG:Loading additional settings from config file newsize.conf [snip]Create a
dosbox.confunder current directory, DOSBox loads it as default.
DOSBox should start up and resize to 1280x960 in this case.
Note that you probably would not get any size you desired, for instance, I set 1280x720 and I got 1152x720.
Can't operator == be applied to generic types in C#?
If you want to make sure the operators of your custom type are called you can do so via reflection. Just get the type using your generic parameter and retrieve the MethodInfo for the desired operator (e.g. op_Equality, op_Inequality, op_LessThan...).
var methodInfo = typeof (T).GetMethod("op_Equality",
BindingFlags.Static | BindingFlags.Public);
Then execute the operator using the MethodInfo's Invoke method and pass in the objects as the parameters.
var result = (bool) methodInfo.Invoke(null, new object[] { object1, object2});
This will invoke your overloaded operator and not the one defined by the constraints applied on the generic parameter. Might not be practical, but could come in handy for unit testing your operators when using a generic base class that contains a couple of tests.
PHP Check for NULL
Make sure that the value of the column is really NULL and not an empty string or 0.
How to extract year and month from date in PostgreSQL without using to_char() function?
It is working for "greater than" functions not for less than.
For example:
select date_part('year',txndt)
from "table_name"
where date_part('year',txndt) > '2000' limit 10;
is working fine.
but for
select date_part('year',txndt)
from "table_name"
where date_part('year',txndt) < '2000' limit 10;
I am getting error.
Java 8 Streams: multiple filters vs. complex condition
A complex filter condition is better in performance perspective, but the best performance will show old fashion for loop with a standard if clause is the best option. The difference on a small array 10 elements difference might ~ 2 times, for a large array the difference is not that big.
You can take a look on my GitHub project, where I did performance tests for multiple array iteration options
For small array 10 element throughput ops/s:
For medium 10,000 elements throughput ops/s:
For large array 1,000,000 elements throughput ops/s:
NOTE: tests runs on
- 8 CPU
- 1 GB RAM
- OS version: 16.04.1 LTS (Xenial Xerus)
- java version: 1.8.0_121
- jvm: -XX:+UseG1GC -server -Xmx1024m -Xms1024m
UPDATE: Java 11 has some progress on the performance, but the dynamics stay the same
Benchmark mode: Throughput, ops/time
Uri not Absolute exception getting while calling Restful Webservice
For others who landed in this error and it's not 100% related to the OP question, please check that you are passing the value and it is not null in case of spring-boot: @Value annotation.
What is the difference between HTTP status code 200 (cache) vs status code 304?
This threw me for a long time too. The first thing I'd verify is that you're not reloading the page by clicking the refresh button, that will always issue a conditional request for resources and will return 304s for many of the page elements. Instead go up to the url bar select the page and hit enter as if you had just typed in the same URL again, that will give you a better indicator of what's being cached properly. This article does a great job explaining the difference between conditional and unconditional requests and how the refresh button affects them: http://blogs.msdn.com/b/ieinternals/archive/2010/07/08/technical-information-about-conditional-http-requests-and-the-refresh-button.aspx
What's the best way to share data between activities?
Assuming you are calling activity two from activity one using an Intent.
You can pass the data with the intent.putExtra(),
Take this for your reference. Sending arrays with Intent.putExtra
Hope that's what you want.
How to use ng-repeat without an html element
If you use ng > 1.2, here is an example of using ng-repeat-start/end without generating unnecessary tags:
<html>_x000D_
<head>_x000D_
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>_x000D_
<script>_x000D_
angular.module('mApp', []);_x000D_
</script>_x000D_
</head>_x000D_
<body ng-app="mApp">_x000D_
<table border="1" width="100%">_x000D_
<tr ng-if="0" ng-repeat-start="elem in [{k: 'A', v: ['a1','a2']}, {k: 'B', v: ['b1']}, {k: 'C', v: ['c1','c2','c3']}]"></tr>_x000D_
_x000D_
<tr>_x000D_
<td rowspan="{{elem.v.length}}">{{elem.k}}</td>_x000D_
<td>{{elem.v[0]}}</td>_x000D_
</tr>_x000D_
<tr ng-repeat="v in elem.v" ng-if="!$first">_x000D_
<td>{{v}}</td>_x000D_
</tr>_x000D_
_x000D_
<tr ng-if="0" ng-repeat-end></tr>_x000D_
</table>_x000D_
</body>_x000D_
</html>The important point: for tags used for ng-repeat-start and ng-repeat-end set ng-if="0", to let not be inserted in the page. In this way the inner content will be handled exactly as it is in knockoutjs (using commands in <!--...-->), and there will be no garbage.
Is there a way to override class variables in Java?
It indeed prints 'dad', since the field is not overridden but hidden. There are three approaches to make it print 'son':
Approach 1: override printMe
class Dad
{
protected static String me = "dad";
public void printMe()
{
System.out.println(me);
}
}
class Son extends Dad
{
protected static String me = "son";
@override
public void printMe()
{
System.out.println(me);
}
}
public void doIt()
{
new Son().printMe();
}
Approach 2: don't hide the field and initialize it in the constructor
class Dad
{
protected static String me = "dad";
public void printMe()
{
System.out.println(me);
}
}
class Son extends Dad
{
public Son()
{
me = "son";
}
}
public void doIt()
{
new Son().printMe();
}
Approach 3: use the static value to initialize a field in the constructor
class Dad
{
private static String meInit = "Dad";
protected String me;
public Dad()
{
me = meInit;
}
public void printMe()
{
System.out.println(me);
}
}
class Son extends Dad
{
private static String meInit = "son";
public Son()
{
me = meInit;
}
}
public void doIt()
{
new Son().printMe();
}
Does mobile Google Chrome support browser extensions?
You can use bookmarklets (javascript code in a bookmark) - this also means they sync across devices.
I have loads - I prefix the name with zzz, so they are eazy to type in to the address bar and show in drop down predictions.
To get them to operate on a page you need to go to the page and then in the address bar type the bookmarklet name - this will cause the bookmarklet to execute in the context of the page.
edit
Just to highlight - for this to work, the bookmarklet name must be typed into the address bar while the page you want to operate in is being displayed - if you go off to select the bookmarklet in some other way the page context gets lost, and the bookmarklet operates on a new empty page.
I use zzzpocket - send to pocket. zzztwitter tweet this page zzzmail email this page zzzpressthis send this page to wordpress zzztrello send this page to trello and more...
and it works in chrome whatever platform I am currently logged on to.
correct quoting for cmd.exe for multiple arguments
Spaces are used for separating Arguments. In your case C:\Program becomes argument. If your file path contains spaces then add Double quotation marks. Then cmd will recognize it as single argument.
How to get all Windows service names starting with a common word?
Save it as a .ps1 file and then execute
powershell -file "path\to your\start stop nation service command file.ps1"
JavaScript - Getting HTML form values
<form id='form'>
<input type='text' name='title'>
<input type='text' name='text'>
<input type='email' name='email'>
</form>
const element = document.getElementByID('#form')
const data = new FormData(element)
const form = Array.from(data.entries())
/*
form = [
["title", "a"]
["text", "b"]
["email", "c"]
]
*/
for (const [name, value] of form) {
console.log({ name, value })
/*
{name: "title", value: "a"}
{name: "text", value: "b"}
{name: "email", value: "c"}
*/
}
Cannot implicitly convert type 'int' to 'short'
Read Eric Lippert 's answers to these questions
How to make Toolbar transparent?
Only this worked for me (AndroidX support library):
<com.google.android.material.appbar.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@null"
android:theme="@style/AppTheme.AppBarOverlay"
android:translationZ="0.1dp"
app:elevation="0dp">
<androidx.appcompat.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="@null"
app:popupTheme="@style/AppTheme.PopupOverlay" />
</com.google.android.material.appbar.AppBarLayout>
This code removes background in all necessary views and also removes shadow from AppBarLayout (which was a problem)
Answer was found here: remove shadow below AppBarLayout widget android
Margin between items in recycler view Android
Instead of using XML to add margin between items in RecyclerView, it's better way to use RecyclerView.ItemDecoration that provide by android framework.
So, I create a library to solve this issue.
https://github.com/TheKhaeng/recycler-view-margin-decoration
Converting string to number in javascript/jQuery
You can use parseInt(string, radix) to convert string value to integer like this code below
var votevalue = parseInt($('button').data('votevalue'));
?
How to align LinearLayout at the center of its parent?
for ImageView or others views who layout-gravity or gravity does not exist use :
android:layout_centerInParent="true" in the child
(I had a relative layout with an ImageView as a child).
How to escape a while loop in C#
"break" is a command that breaks out of the "closest" loop.
While there are many good uses for break, you shouldn't use it if you don't have to -- it can be seen as just another way to use goto, which is considered bad.
For example, why not:
while (!(the condition you're using to break))
{
//Your code here.
}
If the reason you're using "break" is because you don't want to continue execution of that iteration of the loop, you may want to use the "continue" keyword, which immediately jumps to the next iteration of the loop, whether it be while or for.
while (!condition) {
//Some code
if (condition) continue;
//More code that will be skipped over if the condition was true
}
Changing :hover to touch/click for mobile devices
On most devices, the other answers work. For me, to ensure it worked on every device (in react) I had to wrap it in an anchor tag <a> and add the following:
:hover, :focus, :active (in that order), as well as role="button" and tabIndex="0".
Uncaught (in promise) TypeError: Failed to fetch and Cors error
Adding mode:'no-cors' to the request header guarantees that no response will be available in the response
Adding a "non standard" header, line 'access-control-allow-origin' will trigger a OPTIONS preflight request, which your server must handle correctly in order for the POST request to even be sent
You're also doing fetch wrong ... fetch returns a "promise" for a Response object which has promise creators for json, text, etc. depending on the content type...
In short, if your server side handles CORS correctly (which from your comment suggests it does) the following should work
function send(){
var myVar = {"id" : 1};
console.log("tuleb siia", document.getElementById('saada').value);
fetch("http://localhost:3000", {
method: "POST",
headers: {
"Content-Type": "text/plain"
},
body: JSON.stringify(myVar)
}).then(function(response) {
return response.json();
}).then(function(muutuja){
document.getElementById('väljund').innerHTML = JSON.stringify(muutuja);
});
}
however, since your code isn't really interested in JSON (it stringifies the object after all) - it's simpler to do
function send(){
var myVar = {"id" : 1};
console.log("tuleb siia", document.getElementById('saada').value);
fetch("http://localhost:3000", {
method: "POST",
headers: {
"Content-Type": "text/plain"
},
body: JSON.stringify(myVar)
}).then(function(response) {
return response.text();
}).then(function(muutuja){
document.getElementById('väljund').innerHTML = muutuja;
});
}
caching JavaScript files
From PHP:
function OutputJs($Content)
{
ob_start();
echo $Content;
$expires = DAY_IN_S; // 60 * 60 * 24 ... defined elsewhere
header("Content-type: x-javascript");
header('Content-Length: ' . ob_get_length());
header('Cache-Control: max-age='.$expires.', must-revalidate');
header('Pragma: public');
header('Expires: '. gmdate('D, d M Y H:i:s', time()+$expires).'GMT');
ob_end_flush();
return;
}
works for me.
As a developer you'll probably quickly run into the situation that you don't want files cached, in which case see Help with aggressive JavaScript caching
Modulo operator in Python
same as a normal modulo 3.14 % 6.28 = 3.14, just like 3.14%4 =3.14 3.14%2 = 1.14 (the remainder...)
correct PHP headers for pdf file download
Example 2 on w3schools shows what you are trying to achieve.
<?php header("Content-type:application/pdf"); // It will be called downloaded.pdf header("Content-Disposition:attachment;filename='downloaded.pdf'"); // The PDF source is in original.pdf readfile("original.pdf"); ?>
Also remember that,
It is important to notice that header() must be called before any actual output is sent (In PHP 4 and later, you can use output buffering to solve this problem)
Setting a max height on a table
Add display:block; to the table's css. (in other words.. tell the table to act like a block element rather than a table.)
How to POST JSON data with Python Requests?
The better way is:
url = "http://xxx.xxxx.xx"
data = {
"cardno": "6248889874650987",
"systemIdentify": "s08",
"sourceChannel": 12
}
resp = requests.post(url, json=data)
MySQLi count(*) always returns 1
Always try to do an associative fetch, that way you can easy get what you want in multiple case result
Here's an example
$result = $mysqli->query("SELECT COUNT(*) AS cityCount FROM myCity")
$row = $result->fetch_assoc();
echo $row['cityCount']." rows in table myCity.";
How to get first 5 characters from string
An alternative way to get only one character.
$str = 'abcdefghij';
echo $str{5};
I would particularly not use this, but for the purpose of education. We can use that to answer the question:
$newString = '';
for ($i = 0; $i < 5; $i++) {
$newString .= $str{$i};
}
echo $newString;
For anyone using that. Bear in mind curly brace syntax for accessing array elements and string offsets is deprecated from PHP 7.4
More information: https://wiki.php.net/rfc/deprecate_curly_braces_array_access
Common CSS Media Queries Break Points
I can tell you I am using just a single breakpoint at 768 - that is min-width: 768px to serve tablets and desktops, and max-width: 767px to serve phones.
I haven't looked back since. It makes the responsive development easy and not a chore, and provides a reasonable experience on all devices at minimal cost to development time without the need to fear a new Android device with a new resolution you haven't factored in.
How do I clear a search box with an 'x' in bootstrap 3?
Place the image (cancel icon) with position absolute, adjust top and left properties and call method onclick event which clears the input field.
<div class="form-control">
<input type="text" id="inputField" />
</div>
<span id="iconSpan"><img src="icon.png" onclick="clearInputField()"/></span>
In css position the span accordingly,
#iconSpan {
position : absolute;
top:1%;
left :14%;
}
What are the differences between Abstract Factory and Factory design patterns?
Consider this example for easy understanding.
What does telecommunication companies provide? Broadband, phone line and mobile for instance and you're asked to create an application to offer their products to their customers.
Generally what you'd do here is, creating the products i.e broadband, phone line and mobile are through your Factory Method where you know what properties you have for those products and it's pretty straightforward.
Now, the company wants to offer their customer a bundle of their products i.e broadband, phone line, and mobile altogether, and here comes the Abstract Factory to play.
Abstract Factory is, in other words, are the composition of other factories who are responsible for creating their own products and Abstract Factory knows how to place these products in more meaningful in respect of its own responsibilities.
In this case, the BundleFactory is the Abstract Factory, BroadbandFactory, PhonelineFactory and MobileFactory are the Factory. To simplify more, these Factories will have Factory Method to initialise the individual products.
Se the code sample below:
public class BroadbandFactory : IFactory {
public static Broadband CreateStandardInstance() {
// broadband product creation logic goes here
}
}
public class PhonelineFactory : IFactory {
public static Phoneline CreateStandardInstance() {
// phoneline product creation logic goes here
}
}
public class MobileFactory : IFactory {
public static Mobile CreateStandardInstance() {
// mobile product creation logic goes here
}
}
public class BundleFactory : IAbstractFactory {
public static Bundle CreateBundle() {
broadband = BroadbandFactory.CreateStandardInstance();
phoneline = PhonelineFactory.CreateStandardInstance();
mobile = MobileFactory.CreateStandardInstance();
applySomeDiscountOrWhatever(broadband, phoneline, mobile);
}
private static void applySomeDiscountOrWhatever(Broadband bb, Phoneline pl, Mobile m) {
// some logic here
// maybe manange some variables and invoke some other methods/services/etc.
}
}
Hope this helps.
R legend placement in a plot
Building on @P-Lapointe solution, but making it extremely easy, you could use the maximum values from your data using max() and then you re-use those maximum values to set the legend xy coordinates. To make sure you don't get beyond the borders, you set up ylim slightly over the maximum values.
a=c(rnorm(1000))
b=c(rnorm(1000))
par(mfrow=c(1,2))
plot(a,ylim=c(0,max(a)+1))
legend(x=max(a)+0.5,legend="a",pch=1)
plot(a,b,ylim=c(0,max(b)+1),pch=2)
legend(x=max(b)-1.5,y=max(b)+1,legend="b",pch=2)
Run PowerShell scripts on remote PC
Can you try the following?
psexec \\server cmd /c "echo . | powershell script.ps1"
Addition for BigDecimal
It's actually rather easy. Just do this:
BigDecimal test = new BigDecimal(0);
System.out.println(test);
test = test.add(new BigDecimal(30));
System.out.println(test);
test = test.add(new BigDecimal(45));
System.out.println(test);
See also: BigDecimal#add(java.math.BigDecimal)
How to force a script reload and re-execute?
How about adding a new script tag to <head> with the script to (re)load? Something like below:
<script>
function load_js()
{
var head= document.getElementsByTagName('head')[0];
var script= document.createElement('script');
script.src= 'source_file.js';
head.appendChild(script);
}
load_js();
</script>
The main point is inserting a new script tag -- you can remove the old one without consequence. You may need to add a timestamp to the query string if you have caching issues.
NLS_NUMERIC_CHARACTERS setting for decimal
Jaanna, the session parameters in Oracle SQL Developer are dependent on your client computer, while the NLS parameters on PL/SQL is from server.
For example the NLS_NUMERIC_CHARACTERS on client computer can be ',.' while it's '.,' on server.
So when you run script from PL/SQL and Oracle SQL Developer the decimal separator can be completely different for the same script, unless you alter session with your expected NLS_NUMERIC_CHARACTERS in the script.
One way to easily test your session parameter is to do:
select to_number(5/2) from dual;
Convert List<DerivedClass> to List<BaseClass>
You can also use the System.Runtime.CompilerServices.Unsafe NuGet package to create a reference to the same List:
using System.Runtime.CompilerServices;
...
class Tool { }
class Hammer : Tool { }
...
var hammers = new List<Hammer>();
...
var tools = Unsafe.As<List<Tool>>(hammers);
Given the sample above, you can access the existing Hammer instances in the list using the tools variable. Adding Tool instances to the list throws an ArrayTypeMismatchException exception because tools references the same variable as hammers.
How can I show/hide a specific alert with twitter bootstrap?
You need to use an id selector:
//show
$('#passwordsNoMatchRegister').show();
//hide
$('#passwordsNoMatchRegister').hide();
# is an id selector and passwordsNoMatchRegister is the id of the div.
SQL Server: Is it possible to insert into two tables at the same time?
-- ================================================
-- Template generated from Template Explorer using:
-- Create Procedure (New Menu).SQL
--
-- Use the Specify Values for Template Parameters
-- command (Ctrl-Shift-M) to fill in the parameter
-- values below.
--
-- This block of comments will not be included in
-- the definition of the procedure.
-- ================================================
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER PROCEDURE InsetIntoTwoTable
(
@name nvarchar(50),
@Email nvarchar(50)
)
AS
BEGIN
SET NOCOUNT ON;
insert into dbo.info(name) values (@name)
insert into dbo.login(Email) values (@Email)
END
GO
Android: show soft keyboard automatically when focus is on an EditText
Why this answer - Because above solution will show your keyboard but it will not vanish if you click anywhere other that EditText. So you need to do something to make the keybaord disappear when EditText loses focus.
You can achieve this by doing the following steps:
Make the parent view(content view of your activity) clickable and focusable by adding the following attributes
android:clickable="true" android:focusableInTouchMode="true"Implement a hideKeyboard() method
public void hideKeyboard(View view) { InputMethodManager inputMethodManager =(InputMethodManager)getSystemService(Activity.INPUT_METHOD_SERVICE); inputMethodManager.hideSoftInputFromWindow(view.getWindowToken(),InputMethodManager.HIDE_IMPLICIT_ONLY ); }Lastly, set the onFocusChangeListener of your edittext.
edittext.setOnFocusChangeListener(new View.OnFocusChangeListener() { @Override public void onFocusChange(View v, boolean hasFocus) { if (!hasFocus) { hideKeyboard(v); } } });
What is Scala's yield?
Consider the following for-comprehension
val A = for (i <- Int.MinValue to Int.MaxValue; if i > 3) yield i
It may be helpful to read it out loud as follows
"For each integer i, if it is greater than 3, then yield (produce) i and add it to the list A."
In terms of mathematical set-builder notation, the above for-comprehension is analogous to
which may be read as
"For each integer , if it is greater than
, then it is a member of the set
."
or alternatively as
" is the set of all integers
, such that each
is greater than
."
Python 3.1.1 string to hex
The hex codec has been chucked in 3.x. Use binascii instead:
>>> binascii.hexlify(b'hello')
b'68656c6c6f'
Difference between datetime and timestamp in sqlserver?
According to the documentation, timestamp is a synonym for rowversion - it's automatically generated and guaranteed1 to be unique. datetime isn't - it's just a data type which handles dates and times, and can be client-specified on insert etc.
1 Assuming you use it properly, of course. See comments.
How do I use vim registers?
- q5 records edits into register 5 (next q stops recording)
- :reg show all registers and any contents in them
- @5 execute register 5 macro (recorded edits)
Why doesn't catching Exception catch RuntimeException?
The premise of the question is flawed, because catching Exception does catch RuntimeException. Demo code:
public class Test {
public static void main(String[] args) {
try {
throw new RuntimeException("Bang");
} catch (Exception e) {
System.out.println("I caught: " + e);
}
}
}
Output:
I caught: java.lang.RuntimeException: Bang
Your loop will have problems if:
callbacksis null- anything modifies
callbackswhile the loop is executing (if it were a collection rather than an array)
Perhaps that's what you're seeing?
How to get the wsdl file from a webservice's URL
to get the WSDL (Web Service Description Language) from a Web Service URL.
Is possible from SOAP Web Services:
http://www.w3schools.com/xml/tempconvert.asmx
to get the WSDL we have only to add ?WSDL , for example:
Get value of a specific object property in C# without knowing the class behind
Reflection can help you.
var someObject;
var propertyName = "PropertyWhichValueYouWantToKnow";
var propertyName = someObject.GetType().GetProperty(propertyName).GetValue(someObject, null);
Get current user id in ASP.NET Identity 2.0
GetUserId() is an extension method on IIdentity and it is in Microsoft.AspNet.Identity.IdentityExtensions. Make sure you have added the namespace with using Microsoft.AspNet.Identity;.
Check if URL has certain string with PHP
Try something like this. The first row builds your URL and the rest check if it contains the word "car".
$url = 'http://' . $_SERVER['SERVER_NAME'] . $_SERVER['REQUEST_URI'];
if (strpos($url,'car') !== false) {
echo 'Car exists.';
} else {
echo 'No cars.';
}
How to create websockets server in PHP
Need to convert the the key from hex to dec before base64_encoding and then send it for handshake.
$hashedKey = sha1($key. "258EAFA5-E914-47DA-95CA-C5AB0DC85B11",true);
$rawToken = "";
for ($i = 0; $i < 20; $i++) {
$rawToken .= chr(hexdec(substr($hashedKey,$i*2, 2)));
}
$handshakeToken = base64_encode($rawToken) . "\r\n";
$handshakeResponse = "HTTP/1.1 101 Switching Protocols\r\nUpgrade: websocket\r\nConnection: Upgrade\r\nSec-WebSocket-Accept: $handshakeToken\r\n";
Tuning nginx worker_process to obtain 100k hits per min
Config file:
worker_processes 4; # 2 * Number of CPUs
events {
worker_connections 19000; # It's the key to high performance - have a lot of connections available
}
worker_rlimit_nofile 20000; # Each connection needs a filehandle (or 2 if you are proxying)
# Total amount of users you can serve = worker_processes * worker_connections
more info: Optimizing nginx for high traffic loads
new DateTime() vs default(DateTime)
The simpliest way to understand it is that DateTime is a struct. When you initialize a struct it's initialize to it's minimum value : DateTime.Min
Therefore there is no difference between default(DateTime) and new DateTime() and DateTime.Min
Returning http status code from Web Api controller
For ASP.NET Web Api 2, this post from MS suggests to change the method's return type to IHttpActionResult. You can then return a built in IHttpActionResult implementation like Ok, BadRequest, etc (see here) or return your own implementation.
For your code, it could be done like:
public IHttpActionResult GetUser(int userId, DateTime lastModifiedAtClient)
{
var user = new DataEntities().Users.First(p => p.Id == userId);
if (user.LastModified <= lastModifiedAtClient)
{
return StatusCode(HttpStatusCode.NotModified);
}
return Ok(user);
}
How to find when a web page was last updated
This is a Pythonic way to do it:
import httplib
import yaml
c = httplib.HTTPConnection(address)
c.request('GET', url_path)
r = c.getresponse()
# get the date into a datetime object
lmd = r.getheader('last-modified')
if lmd != None:
cur_data = { url: datetime.strptime(lmd, '%a, %d %b %Y %H:%M:%S %Z') }
else:
print "Hmmm, no last-modified data was returned from the URL."
print "Returned header:"
print yaml.dump(dict(r.getheaders()), default_flow_style=False)
The rest of the script includes an example of archiving a page and checking for changes against the new version, and alerting someone by email.
Select all columns except one in MySQL?
The accepted answer has several shortcomings.
- It fails where the table or column names requires backticks
- It fails if the column you want to omit is last in the list
- It requires listing the table name twice (once for the select and another for the query text) which is redundant and unnecessary
- It can potentially return column names in the wrong order
All of these issues can be overcome by simply including backticks in the SEPARATOR for your GROUP_CONCAT and using a WHERE condition instead of REPLACE(). For my purposes (and I imagine many others') I wanted the column names returned in the same order that they appear in the table itself. To achieve this, here we use an explicit ORDER BY clause inside of the GROUP_CONCAT() function:
SELECT CONCAT(
'SELECT `',
GROUP_CONCAT(COLUMN_NAME ORDER BY `ORDINAL_POSITION` SEPARATOR '`,`'),
'` FROM `',
`TABLE_SCHEMA`,
'`.`',
TABLE_NAME,
'`;'
)
FROM INFORMATION_SCHEMA.COLUMNS
WHERE `TABLE_SCHEMA` = 'my_database'
AND `TABLE_NAME` = 'my_table'
AND `COLUMN_NAME` != 'column_to_omit';
React: Expected an assignment or function call and instead saw an expression
Possible way is (sure you can change array declaration to getting from db or another external resource):
const MyPosts = () => {
let postsRawData = [
{ id: 1, text: 'Post 1', likesCount: '1' },
{ id: 2, text: 'Post 2', likesCount: '231' },
{ id: 3, text: 'Post 3', likesCount: '547' }
];
const postsItems = []
for (const [key, value] of postsRawData.entries()) {
postsItems.push(<Post text={value.text} likesCount={value.likesCount} />)
}
return (
<div className={css.posts}>Posts:
{postsItems}
</div>
)
}
How do I prompt for Yes/No/Cancel input in a Linux shell script?
Bash has select for this purpose.
select result in Yes No Cancel
do
echo $result
done
Undoing a 'git push'
You need to make sure that no other users of this repository are fetching the incorrect changes or trying to build on top of the commits that you want removed because you are about to rewind history.
Then you need to 'force' push the old reference.
git push -f origin last_known_good_commit:branch_name
or in your case
git push -f origin cc4b63bebb6:alpha-0.3.0
You may have receive.denyNonFastForwards set on the remote repository. If this is the case, then you will get an error which includes the phrase [remote rejected].
In this scenario, you will have to delete and recreate the branch.
git push origin :alpha-0.3.0
git push origin cc4b63bebb6:refs/heads/alpha-0.3.0
If this doesn't work - perhaps because you have receive.denyDeletes set, then you have to have direct access to the repository. In the remote repository, you then have to do something like the following plumbing command.
git update-ref refs/heads/alpha-0.3.0 cc4b63bebb6 83c9191dea8
How do I debug jquery AJAX calls?
here is what I would do in order to debug and get the php errors into javascript console.log after an ajax call:
$('#ChangePermission').click(function () {
$.ajax({
url: 'change_permission.php',
type: 'POST',
data: {
'user': document.GetElementById("user").value,
'perm': document.GetElementById("perm").value
},
success: function (data) {
console.log(data);
},
error: function (data) {
console.log(data);
}
});
});
on the php side I would start by asking for all error returned to string concat and echo as a json encoded response that will includes php error messages as well if any.
<?php
error_reporting(E_ALL);
require_once(functions . php);
$result = "true";
$DBH = new PDO("mysql:host=$dbhost;dbname=$dbname", $dbuser, $dbpass);
$DBH->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$STH = $DBH->prepare("INSERT INTO people ( username, permissions ) values (?, ?)");
if (isset($_POST["user"]) && isset($_POST["perm"])) {
$STH->bindParam(1, $_POST["user"], PDO::PARAM_STR);
$STH->bindParam(2, $_POST["perm"], PDO::PARAM_STR);
}
try {
$STH->execute();
} catch (PDOException $e) {
$result .= $e->getMessage;
}
echo json_encode($result);
?>
Hiding a form and showing another when a button is clicked in a Windows Forms application
private void button5_Click(object sender, EventArgs e)
{
this.Visible = false;
Form2 login = new Form2();
login.ShowDialog();
}