With sed, I usually implement non-greedy search by searching for anything except the separator until the separator :
echo "http://www.suon.co.uk/product/1/7/3/" | sed -n 's;\(http://[^/]*\)/.*;\1;p'
Output:
http://www.suon.co.uk
this is:
-n
s/<pattern>/<replace>/p
;
search command separator instead of /
to make it easier to type so s;<pattern>;<replace>;p
\(
... \)
, later accessible with \1
,\2
...http://
[]
, [ab/]
would mean either a
or b
or /
^
in []
means not
, so followed by anything but the thing in the []
[^/]
means anything except /
character*
is to repeat previous group so [^/]*
means characters except /
.sed -n 's;\(http://[^/]*\)
means search and remember http://
followed by any characters except /
and remember what you've found/
so add another /
at the end: sed -n 's;\(http://[^/]*\)/'
but we want to match the rest of the line after the domain so add .*
\1
) is the domain so replace matched line with stuff saved in group \1
and print: sed -n 's;\(http://[^/]*\)/.*;\1;p'
If you want to include backslash after the domain as well, then add one more backslash in the group to remember:
echo "http://www.suon.co.uk/product/1/7/3/" | sed -n 's;\(http://[^/]*/\).*;\1;p'
output:
http://www.suon.co.uk/
In simple words we can say that in Dynamic Programming
(having problem sending message on network) one can first examine the path which takes the shortest time and then start journey,
On the other hand Greedy algorithm
take the optimal decision
on the spot without thinking for the next step and on the next step change its decision again and so on...
Notes:
Dynamic programming
is reliable while Greedy Algorithms is not reliable always.
I think it is telling you exactly what is wrong. You cannot compare an integer with a varchar. PostgreSQL is strict and does not do any magic typecasting for you. I'm guessing SQLServer does typecasting automagically (which is a bad thing).
If you want to compare these two different beasts, you will have to cast one to the other using the casting syntax ::
.
Something along these lines:
create view view1
as
select table1.col1,table2.col1,table3.col3
from table1
inner join
table2
inner join
table3
on
table1.col4::varchar = table2.col5
/* Here col4 of table1 is of "integer" type and col5 of table2 is of type "varchar" */
/* ERROR: operator does not exist: integer = character varying */
....;
Notice the varchar
typecasting on the table1.col4.
Also note that typecasting might possibly render your index on that column unusable and has a performance penalty, which is pretty bad. An even better solution would be to see if you can permanently change one of the two column types to match the other one. Literately change your database design.
Or you could create a index on the casted values by using a custom, immutable function which casts the values on the column. But this too may prove suboptimal (but better than live casting).
timeObject.setSeconds(timeObject.getSeconds() + 10)
Just adding a point to previous answers that in MySQL we can either use
table_factor syntax
OR
joined_table syntax
Table_factor example
SELECT prd.name, b.name
FROM products prd, buyers b
Joined Table example
SELECT prd.name, b.name
FROM products prd
left join buyers b on b.bid = prd.bid;
FYI: Please ignore the fact the the left join on the joined table example doesnot make much sense (in reality we would use some sort of join table to link buyer to the product table instead of saving buyerID in product table).
If you want to sort the list by multiple keys, you can do the following:
my_list = [{'name':'Homer', 'age':39}, {'name':'Milhouse', 'age':10}, {'name':'Bart', 'age':10} ]
sortedlist = sorted(my_list , key=lambda elem: "%02d %s" % (elem['age'], elem['name']))
It is rather hackish, since it relies on converting the values into a single string representation for comparison, but it works as expected for numbers including negative ones (although you will need to format your string appropriately with zero paddings if you are using numbers).
The better way to resolve this problem is to restart your Android Studio.
If you don't want to do a restart, then click on Build -> Clean Project
.
another way to create a data url from blob url may be using canvas.
var canvas = document.createElement("canvas")
var context = canvas.getContext("2d")
context.drawImage(img, 0, 0) // i assume that img.src is your blob url
var dataurl = canvas.toDataURL("your prefer type", your prefer quality)
as what i saw in mdn, canvas.toDataURL is supported well by browsers. (except ie<9, always ie<9)
Most fastest and easy way:
$('#myCheckbox').change(function(){
alert(this.checked);
});
$el[0].checked;
$el - is jquery element of selection.
Enjoy!
You can also change Window's environment variables with:
$env:NODE_OPTIONS="--max-old-space-size=8192"
Call the ToList()
in the foreach
loop. This way we dont need a temp variable copy. It depends on Linq which is available since .Net 3.5.
using System.Linq;
foreach(string key in colStates.Keys.ToList())
{
double Percent = colStates[key] / TotalCount;
if (Percent < 0.05)
{
OtherCount += colStates[key];
colStates[key] = 0;
}
}
There is another solution, i looked for because a had problems with code like this (it s set the system proxy in firefox):
FirefoxProfile profile = new FirefoxProfile();
profile.setPreference("network.proxy.http", "localhost");
profile.setPreference("network.proxy.http_port", "8080");
driver = new FirefoxDriver(profile);
I prefer this solution, it force the proxy manual setting in firefox. To do that, use the org.openqa.selenium.Proxy object to setup Firefox :
FirefoxProfile profile = new FirefoxProfile();
localhostProxy.setProxyType(Proxy.ProxyType.MANUAL);
localhostProxy.setHttpProxy("localhost:8080");
profile.setProxyPreferences(localhostProxy);
driver = new FirefoxDriver(profile);
if it could help...
I always use something like this in a configuration file:
// Toggle this to change the setting
define('DEBUG', true);
// You want all errors to be triggered
error_reporting(E_ALL);
if(DEBUG == true)
{
// You're developing, so you want all errors to be shown
display_errors(true);
// Logging is usually overkill during development
log_errors(false);
}
else
{
// You don't want to display errors on a production environment
display_errors(false);
// You definitely want to log any occurring
log_errors(true);
}
This allows easy toggling between debug settings. You can improve this further by checking on which server the code is running (development, test, acceptance, and production) and change your settings accordingly.
Note that no errors will be logged if error_reporting is set to 0, as cleverly remarked by Korri.
Here is a clean and modern way to do it using Entity FW and without SQL Injection or TSQL..
using (Entities dbe = new Entities())
{
dbe.myTable.RemoveRange(dbe.myTable.ToList());
dbe.SaveChanges();
}
Assuming your current remote is named origin
then:
Delete the current remote reference with
git remote rm origin
Add the new remote
git remote add origin <URL to new heroku app>
push to new domain
git push -u origin master
The -u
will set this up as tracked.
Calling .html()
serializes the element to a string, so all event handlers and other associated data is lost. Here's how I'd do it:
$("#myButton").click(function ()
{
var test = $('<button/>',
{
text: 'Test',
click: function () { alert('hi'); }
});
var parent = $('<tr><td></td></tr>').children().append(test).end();
$("#addNodeTable tr:last").before(parent);
});
Or,
$("#myButton").click(function ()
{
var test = $('<button/>',
{
text: 'Test',
click: function () { alert('hi'); }
}).wrap('<tr><td></td></tr>').closest('tr');
$("#addNodeTable tr:last").before(test);
});
If you don't like passing a map of properties to $()
, you can instead use
$('<button/>')
.text('Test')
.click(function () { alert('hi'); });
// or
$('<button>Test</button>').click(function () { alert('hi'); });
You can use the toLowerCase()
method:
public boolean contains( String haystack, String needle ) {
haystack = haystack == null ? "" : haystack;
needle = needle == null ? "" : needle;
// Works, but is not the best.
//return haystack.toLowerCase().indexOf( needle.toLowerCase() ) > -1
return haystack.toLowerCase().contains( needle.toLowerCase() )
}
Then call it using:
if( contains( str1, str2 ) ) {
System.out.println( "Found " + str2 + " within " + str1 + "." );
}
Notice that by creating your own method, you can reuse it. Then, when someone points out that you should use contains
instead of indexOf
, you have only a single line of code to change.
java.util.Formatter
will do left and right padding. No need for odd third party dependencies (would you want to add them for something so trivial).
[I've left out the details and made this post 'community wiki' as it is not something I have a need for.]
using System;
namespace ConsoleApplication1
{
class Program
{
static void Main(string[] args)
{
DateTime start = new DateTime(2014, 1, 1);
DateTime stop = new DateTime(2014, 12, 31);
int totalWorkingDays = GetNumberOfWorkingDays(start, stop);
Console.WriteLine("There are {0} working days.", totalWorkingDays);
}
private static int GetNumberOfWorkingDays(DateTime start, DateTime stop)
{
TimeSpan interval = stop - start;
int totalWeek = interval.Days / 7;
int totalWorkingDays = 5 * totalWeek;
int remainingDays = interval.Days % 7;
for (int i = 0; i <= remainingDays; i++)
{
DayOfWeek test = (DayOfWeek)(((int)start.DayOfWeek + i) % 7);
if (test >= DayOfWeek.Monday && test <= DayOfWeek.Friday)
totalWorkingDays++;
}
return totalWorkingDays;
}
}
}
If you just want to set the source of the image you can use this.
$("img").attr('src','http://somedomain.com/image.jpg');
The current selected solution appears to have misunderstood the problem.
The trick is to neither use absolute nor fixed positioning. Instead, have the close button outside of the div with its position set to relative and a left float so that it is immediately right of the div. Next, set a negative left margin and a positive z index so that it appears above the div.
Here's an example:
#close
{
position: relative;
float: left;
margin-top: 50vh;
margin-left: -100px;
z-index: 2;
}
#dialog
{
height: 100vh;
width: 100vw;
position: relative;
overflow: scroll;
float: left;
}
<body>
<div id="dialog">
****
</div>
<div id="close"> </div>
</body>
You could simply use echo on
and you will see that goto :eof
or even exit /b
doesn't work as expected.
The code inside of the loop isn't executed anymore, but the loop is expanded for all numbers to the end.
That's why it's so slow.
The only way to exit a FOR /L loop seems to be the variant of exit
like the exsample of Wimmel, but this isn't very fast nor useful to access any results from the loop.
This shows 10 expansions, but none of them will be executed
echo on
for /l %%n in (1,1,10) do (
goto :eof
echo %%n
)
You can need to pass in the string 'int64'
:
>>> import pandas as pd
>>> df = pd.DataFrame({'a': [1.0, 2.0]}) # some test dataframe
>>> df['a'].astype('int64')
0 1
1 2
Name: a, dtype: int64
There are some alternative ways to specify 64-bit integers:
>>> df['a'].astype('i8') # integer with 8 bytes (64 bit)
0 1
1 2
Name: a, dtype: int64
>>> import numpy as np
>>> df['a'].astype(np.int64) # native numpy 64 bit integer
0 1
1 2
Name: a, dtype: int64
Or use np.int64
directly on your column (but it returns a numpy.array
):
>>> np.int64(df['a'])
array([1, 2], dtype=int64)
This is my solution, no warning, no errors, but perfect
let redStr: String = String(trimmStr[String.Index.init(encodedOffset: 0)..<String.Index.init(encodedOffset: 2)])
let greenStr: String = String(trimmStr[String.Index.init(encodedOffset: 3)..<String.Index.init(encodedOffset: 4)])
let blueStr: String = String(trimmStr[String.Index.init(encodedOffset: 5)..<String.Index.init(encodedOffset: 6)])
Swift 4
var orientationLock = UIInterfaceOrientationMask.all
func application(_ application: UIApplication, supportedInterfaceOrientationsFor window: UIWindow?) -> UIInterfaceOrientationMask {
return self.orientationLock
}
struct AppUtility {
static func lockOrientation(_ orientation: UIInterfaceOrientationMask) {
if let delegate = UIApplication.shared.delegate as? AppDelegate {
delegate.orientationLock = orientation
}
}
static func lockOrientation(_ orientation: UIInterfaceOrientationMask, andRotateTo rotateOrientation:UIInterfaceOrientation) {
self.lockOrientation(orientation)
UIDevice.current.setValue(rotateOrientation.rawValue, forKey: "orientation")
}
}
Your ViewController Add Following line if you need only portrait orientation. you have to apply this to all ViewController need to display portrait mode.
override func viewWillAppear(_ animated: Bool) {
AppDelegate.AppUtility.lockOrientation(UIInterfaceOrientationMask.portrait, andRotateTo: UIInterfaceOrientation.portrait)
}
and that will make screen orientation for others Viewcontroller according to device physical orientation.
override func viewWillDisappear(_ animated: Bool) {
AppDelegate.AppUtility.lockOrientation(UIInterfaceOrientationMask.all)
}
On an out of the box MacOS High Sierra 10.13.6
$ ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
Gives the following error:
curl performs SSL certificate verification by default, using a "bundle" of Certificate Authority (CA) public keys (CA certs). If the default bundle file isn't adequate, you can specify an alternate file using the --cacert option.
If this HTTPS server uses a certificate signed by a CA represented in the bundle, the certificate verification probably failed due to a problem with the certificate (it might be expired, or the name might not match the domain name in the URL).
If you'd like to turn off curl's verification of the certificate, use the -k (or --insecure) option.
HTTPS-proxy has similar options --proxy-cacert and --proxy-insecure.
Solution: Just add a k to your Curl Options
$ ruby -e "$(curl -fsSLk https://raw.githubusercontent.com/Homebrew/install/master/install)"
If you are only looking for a refresh rate for the GOOGLEFINANCE
function, keep in mind that data delays can be up to 20 minutes (per Google Finance Disclaimer).
GoogleClock
)Here is a modified version of the refresh action, taking the data delay into consideration, to save on unproductive refresh cycles.
=GoogleClock(GOOGLEFINANCE(symbol,"datadelay"))
For example, with:
then
=GoogleClock(GOOGLEFINANCE("GOOG","datadelay"))
Results in a dynamic data-based refresh rate of:
=GoogleClock(15)
GoogleClock
)If your sheet contains a number of rows of symbols, you could add a datadelay
column for each symbol and use the lowest value, for example:
=GoogleClock(MIN(dataDelayValuesNamedRange))
Where dataDelayValuesNamedRange
is the absolute reference or named reference of the range of cells that contain the data delay values for each symbol (assuming these values are different).
GoogleClock()
The GoogleClock()
function was removed in 2014 and replaced with settings setup for refreshing sheets. At present, I have confirmed that replacement settings is only on available in Sheets from when accessed from a desktop browser, not the mobile app (I'm using Google's mobile Sheets app updated 2016-03-14).
(This part of the answer is based on, and portions copied from, Google Docs Help)
To change how often "some" Google Sheets functions update:
NOTE External data functions recalculate at the following intervals:
The references in earlier sections to the display and use of the datadelay
attribute still apply, as well as the concepts for more efficient coding of sheets.
On a positive note, the new refresh option continues to be refreshed by Google servers regardless of whether you have the sheet loaded or not. That's a positive for shared sheets for sure; even more so for Google Apps Scripts (GAS), where GAS is used in workflow code or referenced data is used as a trigger for an event.
[*] in my understanding so far (I am currently testing this)
Properly parenthesized for clarity, it is
hsb.s = (max != 0) ? (255 * delta / max) : 0;
meaning return either
255*delta/max
if max != 00
if max == 0This has changed, it's now fb://profile/(profileID)
I know that this question has been answered, And all the answers are nice. But I wanted to add my two cents to this question for people who have similar (but not exactly the same) problem.
In a more general way, we can do something like this:
$('body').click(function(evt){
if(!$(evt.target).is('#menu_content')) {
//event handling code
}
});
This way we can handle not only events fired by anything except element with id menu_content
but also events that are fired by anything except any element that we can select using CSS selectors.
For instance in the following code snippet I am getting events fired by any element except all <li>
elements which are descendants of div element with id myNavbar
.
$('body').click(function(evt){
if(!$(evt.target).is('div#myNavbar li')) {
//event handling code
}
});
I have tried these methods and find that they dont work for my needs. In my case, I needed to inject json rendered server side into the main template of the page, so when it loads and angular inits, the data is already there and doesnt have to be retrieved (large dataset).
The easiest solution that I have found is to do the following:
In your angular code outside of the app, module and controller definitions add in a global javascript value - this definition MUST come before the angular stuff is defined.
Example:
'use strict';
//my data variable that I need access to.
var data = null;
angular.module('sample', [])
Then in your controller:
.controller('SampleApp', function ($scope, $location) {
$scope.availableList = [];
$scope.init = function () {
$scope.availableList = data;
}
Finally, you have to init everything (order matters):
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.3.15/angular.min.js"></script>
<script src="/path/to/your/angular/js/sample.js"></script>
<script type="text/javascript">
data = <?= json_encode($cproducts); ?>
</script>
Finally initialize your controller and init function.
<div ng-app="samplerrelations" ng-controller="SamplerApp" ng-init="init();">
By doing this you will now have access to whatever data you stuffed into the global variable.
An alternative is to use any tool for removing line breaks. Write your string using any text editor, once you finished, paste your text here and copy it again in xcode.
I had the same problem. After several tries, I realized that connecting the sql server with windows authentication resolved the issue.
You may need to know the status during the file download or use credentials before making the request.
Here is an example that covers these options:
Uri ur = new Uri("http://remotehost.do/images/img.jpg");
using (WebClient client = new WebClient()) {
//client.Credentials = new NetworkCredential("username", "password");
String credentials = Convert.ToBase64String(Encoding.ASCII.GetBytes("Username" + ":" + "MyNewPassword"));
client.Headers[HttpRequestHeader.Authorization] = $"Basic {credentials}";
client.DownloadProgressChanged += WebClientDownloadProgressChanged;
client.DownloadDataCompleted += WebClientDownloadCompleted;
client.DownloadFileAsync(ur, @"C:\path\newImage.jpg");
}
And the callback's functions implemented as follows:
void WebClientDownloadProgressChanged(object sender, DownloadProgressChangedEventArgs e)
{
Console.WriteLine("Download status: {0}%.", e.ProgressPercentage);
// updating the UI
Dispatcher.Invoke(() => {
progressBar.Value = e.ProgressPercentage;
});
}
void WebClientDownloadCompleted(object sender, DownloadDataCompletedEventArgs e)
{
Console.WriteLine("Download finished!");
}
(Ver 2) - Lambda notation: other possible option for handling the events
client.DownloadProgressChanged += new DownloadProgressChangedEventHandler(delegate(object sender, DownloadProgressChangedEventArgs e) {
Console.WriteLine("Download status: {0}%.", e.ProgressPercentage);
// updating the UI
Dispatcher.Invoke(() => {
progressBar.Value = e.ProgressPercentage;
});
});
client.DownloadDataCompleted += new DownloadDataCompletedEventHandler(delegate(object sender, DownloadDataCompletedEventArgs e){
Console.WriteLine("Download finished!");
});
(Ver 3) - We can do better
client.DownloadProgressChanged += (object sender, DownloadProgressChangedEventArgs e) =>
{
Console.WriteLine("Download status: {0}%.", e.ProgressPercentage);
// updating the UI
Dispatcher.Invoke(() => {
progressBar.Value = e.ProgressPercentage;
});
};
client.DownloadDataCompleted += (object sender, DownloadDataCompletedEventArgs e) =>
{
Console.WriteLine("Download finished!");
};
(Ver 4) - Or
client.DownloadProgressChanged += (o, e) =>
{
Console.WriteLine($"Download status: {e.ProgressPercentage}%.");
// updating the UI
Dispatcher.Invoke(() => {
progressBar.Value = e.ProgressPercentage;
});
};
client.DownloadDataCompleted += (o, e) =>
{
Console.WriteLine("Download finished!");
};
If we stop the algorithm in middle prim's algorithm always generates connected tree, but kruskal on the other hand can give disconnected tree or forest
Use a scalar-valued UDF, not a table-value one, then you can use it in a SELECT as you want.
A shorter version of converting List to Array of specific type (for example Long):
Long[] myArray = myList.toArray(Long[]::new);
Same concept as a .jar
file in Java, it is a .zip
file with some metadata files renamed .egg
, for distributing code as bundles.
Specifically: The Internal Structure of Python Eggs
A "Python egg" is a logical structure embodying the release of a specific version of a Python project, comprising its code, resources, and metadata. There are multiple formats that can be used to physically encode a Python egg, and others can be developed. However, a key principle of Python eggs is that they should be discoverable and importable. That is, it should be possible for a Python application to easily and efficiently find out what eggs are present on a system, and to ensure that the desired eggs' contents are importable.
The
.egg
format is well-suited to distribution and the easy uninstallation or upgrades of code, since the project is essentially self-contained within a single directory or file, unmingled with any other projects' code or resources. It also makes it possible to have multiple versions of a project simultaneously installed, such that individual programs can select the versions they wish to use.
I use testproxy to do this.
npm install testproxy
testproxy http://10.0.2.2
You then get the url (and QR code) you can access on your mobile device. It even works with virtual machines you can't reach by just entering the IP of your dev machine.
If you want to handle server errors globally, you may want to register an interceptor service for $httpProvider:
$httpProvider.interceptors.push(function ($q) {
return {
'responseError': function (rejection) {
// do something on error
if (canRecover(rejection)) {
return responseOrNewPromise
}
return $q.reject(rejection);
}
};
});
For users of Contact Form 7 on Wordpress this method is working for me: I hide the v3 Recaptcha on all pages except those with Contact 7 Forms.
But this method should work on any site where you are using a unique class selector which can identify all pages with text input form elements.
First, I added a target style rule in CSS which can collapse the tile:
CSS
div.grecaptcha-badge.hide{
width:0 !important;
}
Then I added JQuery script in my header to trigger after the window loads so the 'grecaptcha-badge' class selector is available to JQuery, and can add the 'hide' class to apply the available CSS style.
$(window).load(function () {
if(!($('.wpcf7').length)){
$('.grecaptcha-badge').addClass( 'hide' );
}
});
My tile still will flash on every page for a half a second, but it's the best workaround I've found so far that I hope will comply. Suggestions for improvement appreciated.
You could also add listener from XML layout: android:onClick="onRadioButtonClicked"
in your <RadioButton/>
tag.
<RadioButton android:id="@+id/radio_pirates"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/pirates"
android:onClick="onRadioButtonClicked"/>
See Android developer SDK- Radio Buttons for details.
Use Split() function to slice them and ToList() to return them as a list.
var names = "Brian,Joe,Chris";
List<string> nameList = names.Split(',').ToList();
You can pass an ArrayList<E>
the same way, if the E
type is Serializable
.
You would call the putExtra (String name, Serializable value)
of Intent
to store, and getSerializableExtra (String name)
for retrieval.
Example:
ArrayList<String> myList = new ArrayList<String>();
intent.putExtra("mylist", myList);
In the other Activity:
ArrayList<String> myList = (ArrayList<String>) getIntent().getSerializableExtra("mylist");
If you're using node, why not generate them with node? This module seems to be pretty full featured:
Note that I wouldn't generate on the fly. Generate with some kind of build script so you have a consistent certificate and key. Otherwise you'll have to authorize the newly generated self-signed certificate every time.
One possibility is that the target .NET Framework version of the class library is higher than that of the project.
open app/build.gradle
from your app-module and rewrite below line after dependencies block. This allows the plugin to determine what version of Play services you are using
apply plugin: 'com.google.gms.google-services'
I got this idea from here. In this tutorial second point is saying that above plugin line be at the bottom of your app/build.gradle
file so that no dependency collisions are introduced. Hope it will help you out.
You can use attrchange jQuery plugin. The main function of the plugin is to bind a listener function on attribute change of HTML elements.
Code sample:
$("#myDiv").attrchange({
trackValues: true, // set to true so that the event object is updated with old & new values
callback: function(evnt) {
if(evnt.attributeName == "display") { // which attribute you want to watch for changes
if(evnt.newValue.search(/inline/i) == -1) {
// your code to execute goes here...
}
}
}
});
A trick I learned from this PR if you don't want to define it as a static final variable but want to save a bit of overhead and guarantee thread safe.
private static final ThreadLocal<ObjectMapper> om = new ThreadLocal<ObjectMapper>() {
@Override
protected ObjectMapper initialValue() {
ObjectMapper objectMapper = new ObjectMapper();
objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
return objectMapper;
}
};
public static ObjectMapper getObjectMapper() {
return om.get();
}
credit to the author.
Replace '+' with '000'. For example, 'U+1F600' will become 'U0001F600' and prepend the Unicode code with "\" and print. Example:
>>> print("Learning : ", "\U0001F40D")
Learning :
>>>
Check this maybe it will help python unicode emoji
First represent the epoch of the millisecond time as a date (usually 1/1/1970), then add your millisecond time divided by the number of milliseconds in a day (86400000):
=DATE(1970,1,1)+(A1/86400000)
If your cell is properly formatted, you should see a human-readable date/time.
Assigning a value to a local variable and then returning that at the end is considered a good practice. Methods having multiple exits are harder to debug and can be difficult to read.
That said, thats the only plus point left to this paradigm. It was originated when only low-level procedural languages were around. And it made much more sense at that time.
While we are on the topic you must check this out. Its an interesting read.
Download the latest build from https://github.com/macvim-dev/macvim/releases
Expand the archive.
Put MacVim.app into /Applications/
.
Done.
You can also use:
img{
filter:grayscale(100%);
}
img:hover{
filter:none;
}
I suggest to read this since I believe that is what are you looking for.https://en.wikipedia.org/wiki/Erase%E2%80%93remove_idiom
If you use for example
vec.erase(vec.begin() + 1, vec.begin() + 3);
you will erase n -th element of vector but when you erase second element, all other elements of vector will be shifted and vector sized will be -1. This can be problem if you loop through vector since vector size() is decreasing. If you have problem like this provided link suggested to use existing algorithm in standard C++ library. and "remove" or "remove_if".
Hope that this helped
Here is a jsfiddle example. Using Jquery to change the background color based on scroll pixel position.
Here is a fiddle using bootstrap
$(document).ready(function(){
var scroll_start = 0;
var startchange = $('#startchange');
var offset = startchange.offset();
if (startchange.length){
$(document).scroll(function() {
scroll_start = $(this).scrollTop();
if(scroll_start > offset.top) {
$(".navbar-default").css('background-color', '#f0f0f0');
} else {
$('.navbar-default').css('background-color', 'transparent');
}
});
}
});
Use [tableView scrollToRowAtIndexPath:indexPath atScrollPosition:scrollPosition animated:YES];
Scrolls the receiver until a row identified by index path is at a particular location on the screen.
And
scrollToNearestSelectedRowAtScrollPosition:animated:
Scrolls the table view so that the selected row nearest to a specified position in the table view is at that position.
Make this changes in php file
<html>
<head>
<meta charset="utf-8">
<title>Answer</title>
</head>
<body>
<p>The answer is:
<?php
$first = $_POST['first'];
$second= $_POST['second'];
if($_POST['group1'] == 'add') {
echo $first + $second;
}
else if($_POST['group1'] == 'subtract') {
echo $first - $second;
}
else if($_POST['group1'] == 'times') {
echo $first * $second;
}
else if($_POST['group1'] == 'divide') {
echo $first / $second;
}
else {
echo "Enter the numbers properly";
}
?>
</p>
</body>
</html>
To assign a variable inside block which outside of block always use __block specifier before that variable your code should be like this:-
__block Person *aPerson = nil;
You can also use below just simple to check:
If startDate <> Nothing Then
your logic
End If
It will check that the startDate variable of DateTime datatype is null or not.
If you want to print/write double value at console then use System.out.printf()
or System.out.format()
methods.
System.out.printf("\n$%10.2f",shippingCost);
System.out.printf("%n$%.2f",shippingCost);
you can use pydotplus instead of pydot.then follow the belows:
First, find C:\Users\zhangqianyuan\AppData\Local\Programs\Python\Python36\Lib\site-packages\pydotplus
Second, open graphviz.py
Third, find line 1925 - line 1972, find the function def create(self, prog=None, format='ps'):
Final, in the function:
find:
if prog not in self.progs:
raise InvocationException(
'GraphViz\'s executable "%s" not found' % prog)
`
if not os.path.exists(self.progs[prog]) or \
not os.path.isfile(self.progs[prog]):
raise InvocationException(
'GraphViz\'s executable "{}" is not'
' a file or doesn\'t exist'.format(self.progs[prog])
)
between the two blocks add this(Your Graphviz's executable path):
self.progs[prog] = "C:/Program Files (x86)/Graphviz2.38/bin/gvedit.exe"
after adding the result is:
if prog not in self.progs:
raise InvocationException(
'GraphViz\'s executable "%s" not found' % prog)
self.progs[prog] = "C:/Program Files (x86)/Graphviz2.38/bin/gvedit.exe"
if not os.path.exists(self.progs[prog]) or \
not os.path.isfile(self.progs[prog]):
raise InvocationException(
'GraphViz\'s executable "{}" is not'
' a file or doesn\'t exist'.format(self.progs[prog])
)
save the changed file then you can run it successfully.
you'd better save it as bmp file because png file will not work.
If an abstract class is appropriate for your implementation, test (as suggested above) a derived concrete class. Your assumptions are correct.
To avoid future confusion, be aware that this concrete test class is not a mock, but a fake.
In strict terms, a mock is defined by the following characteristics:
Based on @eric-johnson's answer, I'm currently using this in a script:
#!/bin/bash
compose_version=$(curl https://api.github.com/repos/docker/compose/releases/latest | jq .name -r)
output='/usr/local/bin/docker-compose'
curl -L https://github.com/docker/compose/releases/download/$compose_version/docker-compose-$(uname -s)-$(uname -m) -o $output
chmod +x $output
echo $(docker-compose --version)
it grabs the latest version from the GitHub api.
Servlets are the server side java programs which execute inside the web container. The main goal of the servlet is to process the requests received from the client.
Java Server Pages is used to create dynamic web pages. Jsp's were introduced to write java plus html code in a single file which was not easy to do in servlets program. And a jsp file is converted to a java servlet when it is translated.
Java Server Faces is a MVC web framework which simplifies the development of UI.
Following document published by W3C also describes the differences between SOAP 1.1 and 1.2:
If you want to use the same function on different events the following code block can be used
$('input').on('keyup blur focus', function () {
//function block
})
Just a poke, but here's another way to write FizzBuzz :) 100 rows is enough to show the WITH statement, I reckon.
;WITH t100 AS (
SELECT n=number
FROM master..spt_values
WHERE type='P' and number between 1 and 100
)
SELECT
ISNULL(NULLIF(
CASE WHEN n % 3 = 0 THEN 'Fizz' Else '' END +
CASE WHEN n % 5 = 0 THEN 'Buzz' Else '' END, ''), RIGHT(n,3))
FROM t100
But the real power behind WITH (known as Common Table Expression http://msdn.microsoft.com/en-us/library/ms190766.aspx "CTE") in SQL Server 2005 and above is the Recursion, as below where the table is built up through iterations adding to the virtual-table each time.
;WITH t100 AS (
SELECT n=1
union all
SELECT n+1
FROM t100
WHERE n < 100
)
SELECT
ISNULL(NULLIF(
CASE WHEN n % 3 = 0 THEN 'Fizz' Else '' END +
CASE WHEN n % 5 = 0 THEN 'Buzz' Else '' END, ''), RIGHT(n,3))
FROM t100
To run a similar query in all database, you can use the undocumented sp_msforeachdb. It has been mentioned in another answer, but it is sp_msforeachdb, not sp_foreachdb.
Be careful when using it though, as some things are not what you expect. Consider this example
exec sp_msforeachdb 'select count(*) from sys.objects'
Instead of the counts of objects within each DB, you will get the SAME count reported, begin that of the current DB. To get around this, always "use" the database first. Note the square brackets to qualify multi-word database names.
exec sp_msforeachdb 'use [?]; select count(*) from sys.objects'
For your specific query about populating a tally table, you can use something like the below. Not sure about the DATE column, so this tally table has only the DBNAME and IMG_COUNT columns, but hope it helps you.
create table #tbl (dbname sysname, img_count int);
exec sp_msforeachdb '
use [?];
if object_id(''tbldoc'') is not null
insert #tbl
select ''?'', count(*) from tbldoc'
select * from #tbl
In pandas 16.2, I had to do pd.DataFrame.from_records(d)
to get this to work.
Use the pointtype
and pointsize
options, e.g.
plot "./points.dat" using 1:2 pt 7 ps 10
where pt 7
gives you a filled circle and ps 10
is the size.
See: Plotting data.
If you know that you receive integers, you could use:
NSString* val = @"12";
[NSNumber numberWithInt:[val intValue]];
If you want a minimum of 4 characters, for instance,
System.out.println(String.format("%4d", 5));
// Results in " 5", minimum of 4 characters
I assume bash is running on a vt100-compatible terminal in which the user did not explicitly turn off the support for formatting.
First, turn on support for special characters in echo
, using -e
option. Later, use ansi escape sequence ESC[1m
, like:
echo -e "\033[1mSome Text"
More on ansi escape sequences for example here: ascii-table.com/ansi-escape-sequences-vt-100.php
To supplement, here is an example expanded from the documentation, which nicely wraps all you need to know about accessing the paths/URLs in all cases with express:
app.use('/admin', function (req, res, next) { // GET 'http://www.example.com/admin/new?a=b'
console.dir(req.originalUrl) // '/admin/new?a=b' (WARNING: beware query string)
console.dir(req.baseUrl) // '/admin'
console.dir(req.path) // '/new'
console.dir(req.baseUrl + req.path) // '/admin/new' (full path without query string)
next()
})
Based on: https://expressjs.com/en/api.html#req.originalUrl
Conclusion: As c1moore's answer states, use:
var fullPath = req.baseUrl + req.path;
I had this problem with a background process in Mac OS X using the StartupItems
. This is how I solve it:
If I make sudo ps aux
I can see that mytool
is launched.
I found that (due to buffering) when Mac OS X shuts down mytool
never transfers the output to the sed
command. However, if I execute sudo killall mytool
, then mytool
transfers the output to the sed
command. Hence, I added a stop
case to the StartupItems
that is executed when Mac OS X shuts down:
start)
if [ -x /sw/sbin/mytool ]; then
# run the daemon
ConsoleMessage "Starting mytool"
(mytool | sed .... >> myfile.txt) &
fi
;;
stop)
ConsoleMessage "Killing mytool"
killall mytool
;;
Here I have written a detailed article on the topic, as we have several options, Capitalize First Letter of String in Android
Method to Capitalize First Letter of String in Java
public static String capitalizeString(String str) {
String retStr = str;
try { // We can face index out of bound exception if the string is null
retStr = str.substring(0, 1).toUpperCase() + str.substring(1);
}catch (Exception e){}
return retStr;
}
Method to Capitalize First Letter of String in Kotlin
fun capitalizeString(str: String): String {
var retStr = str
try { // We can face index out of bound exception if the string is null
retStr = str.substring(0, 1).toUpperCase() + str.substring(1)
} catch (e: Exception) {
}
return retStr
}
Using XML Attribute
Or you can set this attribute in TextView or EditText in XML
android:inputType="textCapSentences"
The other reason this can happen is running out of memory. Check /var/log/messages and make sure that your my.cnf is not set up to cause mysqld to allocate more memory than your machine has.
Your mysqld process can actually be killed by the kernel and then re-started by the "safe_mysqld" process without you realizing it.
Use top and watch the memory allocation while it's running to see what your headroom is.
make a backup of my.cnf before changing it.
You could read the entire file with dynamic memory allocation, but isn't a good idea because if the file is too big, you could have memory problems.
So is better read short parts of the file and print it.
#include <stdio.h>
#define BLOCK 1000
int main() {
FILE *f=fopen("teste.txt","r");
int size;
char buffer[BLOCK];
// ...
while((size=fread(buffer,BLOCK,sizeof(char),f)>0)
fwrite(buffer,size,sizeof(char),stdout);
fclose(f);
// ...
return 0;
}
Here is the documentation of <select>
. You are using 2 attributes:
multiple
This Boolean attribute indicates that multiple options can be selected in the list. If it is not specified, then only one option can be selected at a time. When multiple is specified, most browsers will show a scrolling list box instead of a single line dropdown.
size
If the control is presented as a scrolling list box (e.g. when multiple is specified), this attribute represents the number of rows in the list that should be visible at one time. Browsers are not required to present a select element as a scrolled list box. The default value is 0.
As described in the docs. <select size="1" multiple>
will render a List box only 1 line visible and a scrollbar. So you are loosing the dropdown/arrow with the multiple
attribute.
The container
class is intentionally not 100% width. It is different fixed widths depending on the width of the viewport.
If you want to work with the full width of the screen, use .container-fluid
:
Bootstrap 3:
<body>
<div class="container-fluid">
<div class="row">
<div class="col-lg-6"></div>
<div class="col-lg-6"></div>
</div>
<div class="row">
<div class="col-lg-8"></div>
<div class="col-lg-4"></div>
</div>
<div class="row">
<div class="col-lg-12"></div>
</div>
</div>
</body>
Bootstrap 2:
<body>
<div class="row">
<div class="span6"></div>
<div class="span6"></div>
</div>
<div class="row">
<div class="span8"></div>
<div class="span4"></div>
</div>
<div class="row">
<div class="span12"></div>
</div>
</body>
You can certainly us the a Select Agregation statement as Postulated by Ben James, However This will result in a view with as many columns as you have tables. An alternate method may be as follows:
SELECT COUNT(user_table.id) AS TableCount,'user_table' AS TableSource FROM user_table
UNION SELECT COUNT(cat_table.id) AS TableCount,'cat_table' AS TableSource FROM cat_table
UNION SELECT COUNT(course_table.id) AS TableCount, 'course_table' AS TableSource From course_table;
The Nice thing about an approch like this is that you can explicitly write the Union statements and generate a view or create a temp table to hold values that are added consecutively from a Proc cals using variables in place of your table names. I tend to go more with the latter, but it really depends on personal preference and application. If you are sure the tables will never change, you want the data in a single row format, and you will not be adding tables. stick with Ben James' solution. Otherwise I'd advise flexibility, you can always hack a cross tab struc.
Bitmap bitmap = ((BitmapDrawable)image.getDrawable()).getBitmap();
I'm writing an sp that could be useful for this purpose, basically this sp pivot any table and return a new table pivoted or return just the set of data, this is the way to execute it:
Exec dbo.rs_pivot_table @schema=dbo,@table=table_name,@column=column_to_pivot,@agg='sum([column_to_agg]),avg([another_column_to_agg]),',
@sel_cols='column_to_select1,column_to_select2,column_to_select1',@new_table=returned_table_pivoted;
please note that in the parameter @agg the column names must be with '['
and the parameter must end with a comma ','
SP
Create Procedure [dbo].[rs_pivot_table]
@schema sysname=dbo,
@table sysname,
@column sysname,
@agg nvarchar(max),
@sel_cols varchar(max),
@new_table sysname,
@add_to_col_name sysname=null
As
--Exec dbo.rs_pivot_table dbo,##TEMPORAL1,tip_liq,'sum([val_liq]),sum([can_liq]),','cod_emp,cod_con,tip_liq',##TEMPORAL1PVT,'hola';
Begin
Declare @query varchar(max)='';
Declare @aggDet varchar(100);
Declare @opp_agg varchar(5);
Declare @col_agg varchar(100);
Declare @pivot_col sysname;
Declare @query_col_pvt varchar(max)='';
Declare @full_query_pivot varchar(max)='';
Declare @ind_tmpTbl int; --Indicador de tabla temporal 1=tabla temporal global 0=Tabla fisica
Create Table #pvt_column(
pivot_col varchar(100)
);
Declare @column_agg table(
opp_agg varchar(5),
col_agg varchar(100)
);
IF EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(@table) AND type in (N'U'))
Set @ind_tmpTbl=0;
ELSE IF OBJECT_ID('tempdb..'+ltrim(rtrim(@table))) IS NOT NULL
Set @ind_tmpTbl=1;
IF EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(@new_table) AND type in (N'U')) OR
OBJECT_ID('tempdb..'+ltrim(rtrim(@new_table))) IS NOT NULL
Begin
Set @query='DROP TABLE '+@new_table+'';
Exec (@query);
End;
Select @query='Select distinct '+@column+' From '+(case when @ind_tmpTbl=1 then 'tempdb.' else '' end)+@schema+'.'+@table+' where '+@column+' is not null;';
Print @query;
Insert into #pvt_column(pivot_col)
Exec (@query)
While charindex(',',@agg,1)>0
Begin
Select @aggDet=Substring(@agg,1,charindex(',',@agg,1)-1);
Insert Into @column_agg(opp_agg,col_agg)
Values(substring(@aggDet,1,charindex('(',@aggDet,1)-1),ltrim(rtrim(replace(substring(@aggDet,charindex('[',@aggDet,1),charindex(']',@aggDet,1)-4),')',''))));
Set @agg=Substring(@agg,charindex(',',@agg,1)+1,len(@agg))
End
Declare cur_agg cursor read_only forward_only local static for
Select
opp_agg,col_agg
from @column_agg;
Open cur_agg;
Fetch Next From cur_agg
Into @opp_agg,@col_agg;
While @@fetch_status=0
Begin
Declare cur_col cursor read_only forward_only local static for
Select
pivot_col
From #pvt_column;
Open cur_col;
Fetch Next From cur_col
Into @pivot_col;
While @@fetch_status=0
Begin
Select @query_col_pvt='isnull('+@opp_agg+'(case when '+@column+'='+quotename(@pivot_col,char(39))+' then '+@col_agg+
' else null end),0) as ['+lower(Replace(Replace(@opp_agg+'_'+convert(varchar(100),@pivot_col)+'_'+replace(replace(@col_agg,'[',''),']',''),' ',''),'&',''))+
(case when @add_to_col_name is null then space(0) else '_'+isnull(ltrim(rtrim(@add_to_col_name)),'') end)+']'
print @query_col_pvt
Select @full_query_pivot=@full_query_pivot+@query_col_pvt+', '
--print @full_query_pivot
Fetch Next From cur_col
Into @pivot_col;
End
Close cur_col;
Deallocate cur_col;
Fetch Next From cur_agg
Into @opp_agg,@col_agg;
End
Close cur_agg;
Deallocate cur_agg;
Select @full_query_pivot=substring(@full_query_pivot,1,len(@full_query_pivot)-1);
Select @query='Select '+@sel_cols+','+@full_query_pivot+' into '+@new_table+' From '+(case when @ind_tmpTbl=1 then 'tempdb.' else '' end)+
@schema+'.'+@table+' Group by '+@sel_cols+';';
print @query;
Exec (@query);
End;
GO
This is an example of execution:
Exec dbo.rs_pivot_table @schema=dbo,@table=##TEMPORAL1,@column=tip_liq,@agg='sum([val_liq]),avg([can_liq]),',@sel_cols='cod_emp,cod_con,tip_liq',@new_table=##TEMPORAL1PVT;
then Select * From ##TEMPORAL1PVT
would return:
Emacs! Eclipse might work too.
you can try this function , very basic
public String getWithoutExtension(String fileFullPath){
return fileFullPath.substring(0, fileFullPath.lastIndexOf('.'));
}
Other people have already answered you how to rollback, but you also asked how you could identify the version number of a migration.
rake db:migrate:status
gives a list of your migrations version, name and status (up or down)/db/migrate
Try this: return (((a>>1)<<1) == a)
Example:
a = 10101011
-----------------
a>>1 --> 01010101
a<<1 --> 10101010
b = 10011100
-----------------
b>>1 --> 01001110
b<<1 --> 10011100
You can use the return
statement inside a stored procedure to return an integer status code (and only of integer type). By convention a return value of zero is used for success.
If no return
is explicitly set, then the stored procedure returns zero.
CREATE PROCEDURE GetImmediateManager
@employeeID INT,
@managerID INT OUTPUT
AS
BEGIN
SELECT @managerID = ManagerID
FROM HumanResources.Employee
WHERE EmployeeID = @employeeID
if @@rowcount = 0 -- manager not found?
return 1;
END
And you call it this way:
DECLARE @return_status int;
DECLARE @managerID int;
EXEC @return_status = GetImmediateManager 2, @managerID output;
if @return_status = 1
print N'Immediate manager not found!';
else
print N'ManagerID is ' + @managerID;
go
You should use the return value for status codes only. To return data, you should use output parameters.
If you want to return a dataset, then use an output parameter of type cursor
.
If they're both strings you can just do:
#define STR3 STR1 STR2
This then expands to:
#define STR3 "s" "1"
and in the C language, separating two strings with space as in "s" "1"
is exactly equivalent to having a single string "s1"
.
Using Bootstrap 3 I create 3 divs of equal width (in 12 column layout 4 columns for each div). This way you can keep your central zone centered even if left/right sections have different widths (if they don't overflow their columns' space).
HTML:
<div id="container">
<div id="left" class="col col-xs-4 text-left">Left</div>
<div id="center" class="col col-xs-4 text-center">Center</div>
<div id="right" class="col col-xs-4 text-right">Right</div>
</div>
CSS:
#container {
border: 1px solid #aaa;
margin: 10px;
padding: 10px;
height: 100px;
}
.col {
border: 1px solid #07f;
padding: 0;
}
To create that structure without libraries I copied some rules from Bootstrap CSS.
HTML:
<div id="container">
<div id="left" class="col">Left</div>
<div id="center" class="col">Center</div>
<div id="right" class="col">Right</div>
</div>
CSS:
* {
box-sizing: border-box;
}
#container {
border: 1px solid #aaa;
margin: 10px;
padding: 10px;
height: 100px;
}
.col {
float: left;
width: 33.33333333%;
border: 1px solid #07f;
padding: 0;
}
#left {
text-align: left;
}
#center {
text-align: center;
}
#right {
text-align: right;
}
Use this CSS to make full screen backgound in a web page.
body {
margin:0;
padding:0;
background:url("https://static.vecteezy.com/system/resources/previews/000/106/719/original/vector-abstract-blue-wave-background.jpg") no-repeat center center fixed;
-webkit-background-size: cover;
-moz-background-size: cover;
-o-background-size: cover;
background-size: cover;
}
Intent sendIntent = new Intent();
sendIntent.setAction(Intent.ACTION_SEND);
sendIntent.putExtra(Intent.EXTRA_TEXT, "This is my text to send.");
sendIntent.setType("text/plain");
Intent shareIntent = Intent.createChooser(sendIntent, null);
startActivity(shareIntent);
You can use this tool to create appropriate c# classes:
http://jsonclassgenerator.codeplex.com/
and when you will have classes created you can simply convert string to object:
public static T ParseJsonObject<T>(string json) where T : class, new()
{
JObject jobject = JObject.Parse(json);
return JsonConvert.DeserializeObject<T>(jobject.ToString());
}
Here that classes: http://ge.tt/2KGtbPT/v/0?c
Just fix namespaces.
Possible duplicate of Modify twitter bootstrap navbar. I guess this is what you are looking for (copied):
.navbar .nav,
.navbar .nav > li {
float:none;
display:inline-block;
*display:inline; /* ie7 fix */
*zoom:1; /* hasLayout ie7 trigger */
vertical-align: top;
}
.navbar-inner {
text-align:center;
}
As stated in the linked answer, you should make a new class with these properties and add it to the nav div.
in template
<md-button class="md-fab md-mini md-warn md-ink-ripple" ng-click="export()" aria-label="Export">
<md-icon class="material-icons" alt="Export" title="Export" aria-label="Export">
system_update_alt
</md-icon></md-button>
in controller
$scope.export = function(){ $window.location.href = $scope.export; };
None of the above mentioned solution worked. The one that seemed to work only provide the functionality for just one cell
Recently I had to enter a lot of names and without suggestions, it was a huge pain. I was fortunate enough to have this excel autocomplete add-in to enable the autocompletion. The down side is that you need to enable macro (but you can always turn it off later)
In addition to the answer given by @l0b0 I just had the situation where I needed to both keep any trailing newlines output by the script and check the script's return code. And the problem with l0b0's answer is that the 'echo x' was resetting $? back to zero... so I managed to come up with this very cunning solution:
RESULTX="$(./myscript; echo x$?)"
RETURNCODE=${RESULTX##*x}
RESULT="${RESULTX%x*}"
Do this instead:
<table width="100%" border="0" cellpadding="0" cellspacing="0">
<tr>
<td bgcolor="#7d9aaa" width="40%" style="color: #ffffff; font-size:15px; font-family:Arial, Helvetica, sans-serif; font-weight: bold; padding:12px;">
Order Confirmation
</td>
<td bgcolor="#7d9aaa" align="right" width="60%" style="color: #ffffff; font-size:15px; font-family:Arial, Helvetica, sans-serif; font-weight: bold; padding:12px;">
Your Confirmation number is {{var order.increment_id}}
</td>
</tr>
</table>
It is better to use two cells and align the content, than using large padding and
's.
You can use the font-weight attribute on your
For example:
<p>This is my paragraph</p>
You can either have your CSS inline as below:
<p style="font-weight:bold;">This is my paragraph</p>
Or have it in your external CSS stylesheet as below:
p{
font-weight:bold;
}
i suggest using phpmyadmin
it’s definitely the best free tool out there and it works on every system with php+mysql
First, you don't need to do all that. In particular, the strcpy
is redundant - you don't need to copy a string just to printf
it. Your message
can be defined with that string in place.
Second, you've not allowed enough space for that "Hello, World!" string (message
needs to be at least 14 characters, allowing the extra one for the null terminator).
On the why, though, it's history. In assembler, there are no strings, only bytes, words etc. Pascal had strings, but there were problems with static typing because of that - string[20]
was a different type that string[40]
. There were languages even in the early days that avoided this issue, but that caused indirection and dynamic allocation overheads which were much more of an efficiency problem back then.
C simply chose to avoid the overheads and stay very low level. Strings are character arrays. Arrays are very closely related to pointers that point to their first item. When array types "decay" to pointer types, the buffer-size information is lost from the static type, so you don't get the old Pascal string issues.
In C++, there's the std::string
class which avoids a lot of these issues - and has the dynamic allocation overheads, but these days we usually don't care about that. And in any case, std::string
is a library class - there's C-style character-array handling underneath.
The default shell on most Linux distributions is Bash. In Bash, variables must use a dollar sign prefix for parameter expansion. For example:
x=20
y=5
expr $x / $y
Of course, Bash also has arithmetic operators and a special arithmetic expansion syntax, so there's no need to invoke the expr binary as a separate process. You can let the shell do all the work like this:
x=20; y=5
echo $((x / y))
It turns out that because of a peculiar mixture of javascript frameworks that I needed to initiate the script using an event listener provide by one of the other frameworks.
the above all look good
but do you want to keep the result?
if so...
you can use the following
result = [element for element in data if element[1] == search]
then a simple
len(result)
lets you know if anything was found (and now you can do stuff with the results)
of course this does not handle elements which are length less than one (which you should be checking unless you know they always are greater than length 1, and in that case should you be using a tuple? (tuples are immutable))
if you know all items are a set length you can also do:
any(second == search for _, second in data)
or for len(data[0]) == 4:
any(second == search for _, second, _, _ in data)
...and I would recommend using
for element in data:
...
instead of
for i in range(len(data)):
...
(for future uses, unless you want to save or use 'i', and just so you know the '0' is not required, you only need use the full syntax if you are starting at a non zero value)
You may want to check out the jblas project. It's a relatively new Java library that uses BLAS, LAPACK and ATLAS for high-performance matrix operations.
The developer has posted some benchmarks in which jblas comes off favourably against MTJ and Colt.
Use MoreLINQ, which has a DistinctBy
method :)
IEnumerable<Car> distinctCars = cars.DistinctBy(car => car.CarCode);
(This is only for LINQ to Objects, mind you.)
If you want to stick to an array then this way you can make use. But its not good as compared to List and not recommended. However it will solve your problem.
import java.util.Scanner;
public class ArrayModify {
public static void main(String[] args) {
int[] list;
String st;
String[] stNew;
Scanner scan = new Scanner(System.in);
System.out.println("Enter Numbers: "); // If user enters 5 6 7 8 9
st = scan.nextLine();
stNew = st.split("\\s+");
list = new int[stNew.length]; // Sets array size to 5
for (int i = 0; i < stNew.length; i++){
list[i] = Integer.parseInt(stNew[i]);
System.out.println("You Enterred: " + list[i]);
}
}
}
From this excellent article on query locks in Postgres, one can get blocked query and blocker query and their information from the following query.
CREATE VIEW lock_monitor AS(
SELECT
COALESCE(blockingl.relation::regclass::text,blockingl.locktype) as locked_item,
now() - blockeda.query_start AS waiting_duration, blockeda.pid AS blocked_pid,
blockeda.query as blocked_query, blockedl.mode as blocked_mode,
blockinga.pid AS blocking_pid, blockinga.query as blocking_query,
blockingl.mode as blocking_mode
FROM pg_catalog.pg_locks blockedl
JOIN pg_stat_activity blockeda ON blockedl.pid = blockeda.pid
JOIN pg_catalog.pg_locks blockingl ON(
( (blockingl.transactionid=blockedl.transactionid) OR
(blockingl.relation=blockedl.relation AND blockingl.locktype=blockedl.locktype)
) AND blockedl.pid != blockingl.pid)
JOIN pg_stat_activity blockinga ON blockingl.pid = blockinga.pid
AND blockinga.datid = blockeda.datid
WHERE NOT blockedl.granted
AND blockinga.datname = current_database()
);
SELECT * from lock_monitor;
As the query is long but useful, the article author has created a view for it to simplify it's usage.
If you're leveraging React Hooks, you can take advantage of the useHistory
API that comes from React Router v5.
import React, {useCallback} from 'react';
import {useHistory} from 'react-router-dom';
export default function StackOverflowExample() {
const history = useHistory();
const handleOnClick = useCallback(() => history.push('/sample'), [history]);
return (
<button type="button" onClick={handleOnClick}>
Go home
</button>
);
}
Another way to write the click handler if you don't want to use useCallback
const handleOnClick = () => history.push('/sample');
The v4 recommended way is to allow your render method to catch a redirect. Use state or props to determine if the redirect component needs to be shown (which then trigger's a redirect).
import { Redirect } from 'react-router';
// ... your class implementation
handleOnClick = () => {
// some action...
// then redirect
this.setState({redirect: true});
}
render() {
if (this.state.redirect) {
return <Redirect push to="/sample" />;
}
return <button onClick={this.handleOnClick} type="button">Button</button>;
}
Reference: https://reacttraining.com/react-router/web/api/Redirect
You can also take advantage of Router
's context that's exposed to the React component.
static contextTypes = {
router: PropTypes.shape({
history: PropTypes.shape({
push: PropTypes.func.isRequired,
replace: PropTypes.func.isRequired
}).isRequired,
staticContext: PropTypes.object
}).isRequired
};
handleOnClick = () => {
this.context.router.push('/sample');
}
This is how <Redirect />
works under the hood.
If you still need to do something similar to v2's implementation, you can create a copy of BrowserRouter
then expose the history
as an exportable constant. Below is a basic example but you can compose it to inject it with customizable props if needed. There are noted caveats with lifecycles, but it should always rerender the Router, just like in v2. This can be useful for redirects after an API request from an action function.
// browser router file...
import createHistory from 'history/createBrowserHistory';
import { Router } from 'react-router';
export const history = createHistory();
export default class BrowserRouter extends Component {
render() {
return <Router history={history} children={this.props.children} />
}
}
// your main file...
import BrowserRouter from './relative/path/to/BrowserRouter';
import { render } from 'react-dom';
render(
<BrowserRouter>
<App/>
</BrowserRouter>
);
// some file... where you don't have React instance references
import { history } from './relative/path/to/BrowserRouter';
history.push('/sample');
Latest BrowserRouter
to extend: https://github.com/ReactTraining/react-router/blob/master/packages/react-router-dom/modules/BrowserRouter.js
Push a new state to the browserHistory
instance:
import {browserHistory} from 'react-router';
// ...
browserHistory.push('/sample');
Reference: https://github.com/reactjs/react-router/blob/master/docs/guides/NavigatingOutsideOfComponents.md
A remix of Bastien Semene code that take Hawkwing comment about generic hashing function into consideration...
def hash_for_file(path, algorithm=hashlib.algorithms[0], block_size=256*128, human_readable=True):
"""
Block size directly depends on the block size of your filesystem
to avoid performances issues
Here I have blocks of 4096 octets (Default NTFS)
Linux Ext4 block size
sudo tune2fs -l /dev/sda5 | grep -i 'block size'
> Block size: 4096
Input:
path: a path
algorithm: an algorithm in hashlib.algorithms
ATM: ('md5', 'sha1', 'sha224', 'sha256', 'sha384', 'sha512')
block_size: a multiple of 128 corresponding to the block size of your filesystem
human_readable: switch between digest() or hexdigest() output, default hexdigest()
Output:
hash
"""
if algorithm not in hashlib.algorithms:
raise NameError('The algorithm "{algorithm}" you specified is '
'not a member of "hashlib.algorithms"'.format(algorithm=algorithm))
hash_algo = hashlib.new(algorithm) # According to hashlib documentation using new()
# will be slower then calling using named
# constructors, ex.: hashlib.md5()
with open(path, 'rb') as f:
for chunk in iter(lambda: f.read(block_size), b''):
hash_algo.update(chunk)
if human_readable:
file_hash = hash_algo.hexdigest()
else:
file_hash = hash_algo.digest()
return file_hash
Markdown: ![Screenshot](http://url/to/img.png)
Then copy image source
Now add ![Screenshot](http://url/to/img.png)
to your README.md file
Done!
Alternatively you can use some image hosting site like imgur
and get it's url and add it in your README.md file or you can use some static file hosting too.
I needed similar functionality, except for a monthly cycle (plus months, minus 1 day). After searching S.O. for a while, I was able to craft this plug-n-play solution:
function add_months($months, DateTime $dateObject)
{
$next = new DateTime($dateObject->format('Y-m-d'));
$next->modify('last day of +'.$months.' month');
if($dateObject->format('d') > $next->format('d')) {
return $dateObject->diff($next);
} else {
return new DateInterval('P'.$months.'M');
}
}
function endCycle($d1, $months)
{
$date = new DateTime($d1);
// call second function to add the months
$newDate = $date->add(add_months($months, $date));
// goes back 1 day from date, remove if you want same day of month
$newDate->sub(new DateInterval('P1D'));
//formats final date to Y-m-d form
$dateReturned = $newDate->format('Y-m-d');
return $dateReturned;
}
Example:
$startDate = '2014-06-03'; // select date in Y-m-d format
$nMonths = 1; // choose how many months you want to move ahead
$final = endCycle($startDate, $nMonths); // output: 2014-07-02
You can use something like code below, if you need to affect only specific value, and not touch others:
view.getLayoutParams().width = newWidth;
If you have a ADO.Net DataTable you could do
int sum = 0;
foreach(DataRow dr in dataTable.Rows)
{
sum += Convert.ToInt32(dr["Amount"]);
}
If you want to query the database table, you could use
Select Sum(Amount) From DataTable
This works for me:
select date_format(date(starttime),'%Y-%m-%d') from data
where date(starttime) >= date '2012-11-02';
Note the format string '%Y-%m-%d' and the format of the input date.
In Get:
public IActionResult Create()
{
ViewData["Tags"] = new SelectList(_context.Tags, "Id", "Name");
return View();
}
In Post:
var selectedIds= Request.Form["Tags"];
In View :
<label>Tags</label>
<select asp-for="Tags" id="Tags" name="Tags" class="form-control" asp-items="ViewBag.Tags" multiple></select>
while doing performance testing, the measure i go by is RPS, that is how many requests per second can the server serve within acceptable latency.
theoretically one server can only run as many requests concurrently as number of cores on it..
It doesn't look like the problem is ASP.net's threading model, since it can potentially serve thousands of rps. It seems like the problem might be your application. Are you using any synchronization primitives ?
also whats the latency on your web services, are they very quick to respond (within microseconds), if not then you might want to consider asynchronous calls, so you dont end up blocking
If this doesnt yeild something, then you might want to profile your code using visual studio or redgate profiler
npm prune [[<@scope>/]<pkg>...] [--production] [--dry-run] [--json]
This command removes "extraneous" packages. If a package name is provided, then only packages matching one of the supplied names are removed.
Extraneous packages are packages that are not listed on the parent package's dependencies list.
If the --production flag is specified or the NODE_ENV environment variable is set to production, this command will remove the packages specified in your devDependencies. Setting --no-production will negate NODE_ENV being set to production.
If the --dry-run flag is used then no changes will actually be made.
If the --json flag is used then the changes npm prune made (or would have made with --dry-run) are printed as a JSON object.
In normal operation with package-locks enabled, extraneous modules are pruned automatically when modules are installed and you'll only need this command with the --production flag.
If you've disabled package-locks then extraneous modules will not be removed and it's up to you to run npm prune from time-to-time to remove them.
npm dedupe
npm ddp
Searches the local package tree and attempts to simplify the overall structure by moving dependencies further up the tree, where they can be more effectively shared by multiple dependent packages.
For example, consider this dependency graph:
a
+-- b <-- depends on [email protected]
| `-- [email protected]
`-- d <-- depends on c@~1.0.9
`-- [email protected]
In this case, npm-dedupe will transform the tree to:
a
+-- b
+-- d
`-- [email protected]
Because of the hierarchical nature of node's module lookup, b and d will both get their dependency met by the single c package at the root level of the tree.
The deduplication algorithm walks the tree, moving each dependency as far up in the tree as possible, even if duplicates are not found. This will result in both a flat and deduplicated tree.
I experienced this error on a Jenkins build server running MSBuild, which outputs the build files to a separate folder location (_PublishedWebsites). Exactly the same - the roslyn folder was not in the bin directory, and all the roslyn files were lumped in with the bin files.
@igor-semin 's answer was the only thing that worked for me (as I am using the C# 6 language features, I cannot simply uninstall the nuget packages as per other answers), but as I am also running CodeAnalysis, I was getting another error on my deployment target server:
An attempt to override an existing mapping was detected for type Microsoft.CodeAnalysis.ICompilationUnitSyntax with name "", currently mapped to type Microsoft.CodeAnalysis.CSharp.Syntax.CompilationUnitSyntax, to type Microsoft.CodeAnalysis.VisualBasic.Syntax.CompilationUnitSyntax.
The reason for this is that as the roslyn files are getting dumped into the main bin directory, when you run the xcopy to recreate them in the nested roslyn folder, you now have 2 copies of these files being compiled and there is a clash between them. After much frustration I decided on a 'hack' fix - an additional post-build task to delete these files from the bin directory, removing the conflict.
The .csproj of my offending projects now looks like:
................... more here ......................
<PropertyGroup>
<PostBuildEvent>
if not exist "$(WebProjectOutputDir)\bin\Roslyn" md "$(WebProjectOutputDir)\bin\Roslyn"
start /MIN xcopy /s /y /R "$(OutDir)roslyn\*.*" "$(WebProjectOutputDir)\bin\Roslyn"
</PostBuildEvent>
</PropertyGroup>
<Target Name="DeleteDuplicateAnalysisFiles" AfterTargets="AfterBuild">
<!-- Jenkins now has copies of the following files in both the bin directory and the 'bin\rosyln' directory. Delete from bin. -->
<ItemGroup>
<FilesToDelete Include="$(WebProjectOutputDir)\bin\Microsoft.CodeAnalysis*.dll" />
</ItemGroup>
<Delete Files="@(FilesToDelete)" />
</Target>
................... more here ......................
Very easy solution with jQuery:
$('#myFormId').attr('action', 'myNewActionTarget.html');
Your form:
<form action=get_action() id="myFormId">
...
</form>
heap space errors generally occur due to either bringing too much data back to the driver or the executor. In your code it does not seem like you are bringing anything back to the driver, but instead you maybe overloading the executors that are mapping an input record/row to another using the threeDReconstruction() method. I am not sure what is in the method definition but that is definitely causing this overloading of the executor. Now you have 2 options,
I would advise being careful with the increase and use only as much as you need. Each job is unique in terms of its memory requirements, so I would advise empirically trying different values increasing every time by a power of 2 (256M,512M,1G .. and so on)
You will arrive at a value for the executor memory that will work. Try re-running the job with this value 3 or 5 times before settling for this configuration.
Calendar.get
takes as argument one of the standard Calendar fields, like YEAR
or MONTH
not a month name.
Calendar.JANUARY
is 0, which is also the value of Calendar.ERA
, so Calendar.getInstance().get(0)
will return the era, in this case Calendar.AD
, which is 1.
For the first part of your question, note that, as is wildly documented, months start at 0, so 10 is actually November.
enumerate()
when working on list actually gives the index and the value of the items inside the list.
For example:
l = [1, 2, 3, 4, 5, 6, 7, 8, 9]
for i, j in enumerate(list):
print(i, j)
gives
0 1
1 2
2 3
3 4
4 5
5 6
6 7
7 8
8 9
where the first column denotes the index of the item and 2nd column denotes the items itself.
In a dictionary
enumm = {0: 1, 1: 2, 2: 3, 4: 4, 5: 5, 6: 6, 7: 7}
for i, j in enumerate(enumm):
print(i, j)
it gives the output
0 0
1 1
2 2
3 4
4 5
5 6
6 7
where the first column gives the index of the key:value
pairs and the second column denotes the keys
of the dictionary enumm
.
So if you want the first column to be the keys
and second columns as values
, better try out dict.iteritems()
(Python 2) or dict.items()
(Python 3)
for i, j in enumm.items():
print(i, j)
output
0 1
1 2
2 3
4 4
5 5
6 6
7 7
Voila
You can use stack
from the base package. But, you need first to coerce your matrix to a data.frame
and to reorder the columns once the data is stacked.
mat <- as.data.frame(mat)
res <- data.frame(time= mat$time,stack(mat,select=-time))
res[,c(3,1,2)]
ind time values
1 C_0 0.0 0.1
2 C_0 0.5 0.2
3 C_0 1.0 0.3
4 C_1 0.0 0.3
5 C_1 0.5 0.4
6 C_1 1.0 0.5
Note that stack
is generally more efficient than the reshape2
package.
To handle this use case, you can use the <ImageBackground>
component, which has the same props as <Image>
, and add whatever children to it you would like to layer on top of it.
Example:
return (
<ImageBackground source={...} style={{width: '100%', height: '100%'}}>
<Text>Inside</Text>
</ImageBackground>
);
For more: ImageBackground | React Native
Note that you must specify some width and height style attributes.
Flask requires you to associate a single 'view function' with an 'endpoint'. You are calling Main.as_view('main')
twice which creates two different functions (exactly the same functionality but different in memory signature). Short story, you should simply do
main_view_func = Main.as_view('main')
app.add_url_rule('/',
view_func=main_view_func,
methods=["GET"])
app.add_url_rule('/<page>/',
view_func=main_view_func,
methods=["GET"])
You can't send an email directly with javascript.
You can, however, open the user's mail client:
window.open('mailto:[email protected]');
There are also some parameters to pre-fill the subject and the body:
window.open('mailto:[email protected]?subject=subject&body=body');
Another solution would be to do an ajax call to your server, so that the server sends the email. Be careful not to allow anyone to send any email through your server.
In addition to this answer, note that in Node.js if you access JSON with the array syntax []
all nested JSON keys should follow that syntax
This is the wrong way
json.first.second.third['comment']
and will will give you the 'undefined' error.
This is the correct way
json['first']['second']['third']['comment']
Statement s = cd.createStatement();
ResultSet r = s.executeQuery("SELECT COUNT(*) AS rowcount FROM FieldMaster");
r.next();
int count = r.getInt("rowcount");
r.close();
System.out.println("MyTable has " + count + " row(s).");
Sometimes JDBC does not support following method gives Error like `TYPE_FORWARD_ONLY' use this solution
Sqlite does not support in JDBC.
resultSet.last();
size = resultSet.getRow();
resultSet.beforeFirst();
So at that time use this solution.
Thanks..
I find this problem in my MacBook, the reason is because as @Stephan said, I use easy_install
to install pip, and the mixture of both py package manage tools led to the pkg_resources.DistributionNotFound
problem.
The resolve is:
easy_install --upgrade pip
Remember: just use one of the above tools to manage your Py packages.
To kill the puma process first run
lsof -wni tcp:3000
to show what is using port 3000. Then use the PID that comes with the result to run the kill process.
For example after running lsof -wni tcp:3000 you might get something like
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
ruby 3366 dummy 8u IPv4 16901 0t0 TCP 127.0.0.1:3000 (LISTEN)
Now run the following to kill the process. (where 3366 is the PID)
kill -9 3366
Should resolve the issue
Addition to @MarkR answer - one thing to note would be that many PHP frameworks with ORMs would not recognize or use advanced DB setup (foreign keys, cascading delete, unique constraints), and this may result in unexpected behaviour.
For example if you delete a record using ORM, and your DELETE CASCADE
will delete records in related tables, ORM's attempt to delete these related records (often automatic) will result in error.
You're checking if the result of IndexOf is larger or equal 0, meaning whether the match starts anywhere in the string. Try checking if it's equal to 0:
if (testList.FindAll(x => x.IndexOf(keyword,
StringComparison.OrdinalIgnoreCase) >= 0).Count > 0)
Console.WriteLine("Found in list");
Now "goat" and "oat" won't match, but "goat" and "goa" will. To avoid this, you can compare the lenghts of the two strings.
To avoid all this complication, you can use a dictionary instead of a list. They key would be the lowercase string, and the value would be the real string. This way, performance isn't hurt because you don't have to use ToLower
for each comparison, but you can still use Contains
.
In my case I was loading a user control dynamically in a page and both the page and user control had the content tags
<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">
Removing this tag from the user control worked for me.
I had got the same CORS error while working on a Vue.js project. You can resolve this either by building a proxy server or another way would be to disable the security settings of your browser (eg, CHROME) for accessing cross origin apis (this is temporary solution & not the best way to solve the issue). Both these solutions had worked for me. The later solution does not require any mock server or a proxy server to be build. Both these solutions can be resolved at the front end.
You can disable the chrome security settings for accessing apis out of the origin by typing the below command on the terminal:
/Applications/Google\ Chrome.app/Contents/MacOS/Google\ Chrome --user-data-dir="/tmp/chrome_dev_session" --disable-web-security
After running the above command on your terminal, a new chrome window with security settings disabled will open up. Now, run your program (npm run serve / npm run dev) again and this time you will not get any CORS error and would be able to GET request using axios.
Hope this helps!
use some thing like
import java.io.*;
import javax.xml.transform.*;
import javax.xml.transform.dom.*;
import javax.xml.transform.stream.*;
//method to convert Document to String
public String getStringFromDocument(Document doc)
{
try
{
DOMSource domSource = new DOMSource(doc);
StringWriter writer = new StringWriter();
StreamResult result = new StreamResult(writer);
TransformerFactory tf = TransformerFactory.newInstance();
Transformer transformer = tf.newTransformer();
transformer.transform(domSource, result);
return writer.toString();
}
catch(TransformerException ex)
{
ex.printStackTrace();
return null;
}
}
In Angular 7, the (ngModelChange)="eventHandler()"
will fire before the value bound to [(ngModel)]="value"
is changed while the (change)="eventHandler()"
will fire after the value bound to [(ngModel)]="value"
is changed.
For MongoDB shell version v4.2.8 I've tried different ways to back-up my database with auth, my winner solution is
mongodump -h <your_hostname> -d <your_db_name> -u <your_db_username> -p <your_db_password> --authenticationDatabase admin -o /path/to/where/i/want
while 1:
root.update()
... is (very!) roughly similar to:
root.mainloop()
The difference is, mainloop
is the correct way to code and the infinite loop is subtly incorrect. I suspect, though, that the vast majority of the time, either will work. It's just that mainloop
is a much cleaner solution. After all, calling mainloop
is essentially this under the covers:
while the_window_has_not_been_destroyed():
wait_until_the_event_queue_is_not_empty()
event = event_queue.pop()
event.handle()
... which, as you can see, isn't much different than your own while loop. So, why create your own infinite loop when tkinter already has one you can use?
Put in the simplest terms possible: always call mainloop
as the last logical line of code in your program. That's how Tkinter was designed to be used.
Merge takes a DataTable, Load requires an IDataReader - so depending on what your data layer gives you access to, use the required method. My understanding is that Load will internally call Merge, but not 100% sure about that.
If you have two DataTables, use Merge.
If you want to easily view the contents of objects while debugging, install a tool like Firebug and use console.log
:
console.log(product);
If you want to view the properties of the object itself, don't alert
the object, but its properties:
alert(product.ProductName);
alert(product.UnitPrice);
// etc... (or combine them)
As said, if you really want to boost your JavaScript debugging, use Firefox with the Firebug addon. You will wonder how you ever debugged your code before.
Well Facebook has undergone MANY many changes and it wasn't originally designed to be efficient. It was designed to do it's job. I have absolutely no idea what the code looks like and you probably won't find much info about it (for obvious security and copyright reasons), but just take a look at the API. Look at how often it changes and how much of it doesn't work properly, anymore, or at all.
I think the biggest ace up their sleeve is the Hiphop. http://developers.facebook.com/blog/post/358 You can use HipHop yourself: https://github.com/facebook/hiphop-php/wiki
But if you ask me it's a very ambitious and probably time wasting task. Hiphop only supports so much, it can't simply convert everything to C++. So what does this tell us? Well, it tells us that Facebook is NOT fully taking advantage of the PHP language. It's not using the latest 5.3 and I'm willing to bet there's still a lot that is PHP 4 compatible. Otherwise, they couldn't use HipHop. HipHop IS A GOOD IDEA and needs to grow and expand, but in it's current state it's not really useful for that many people who are building NEW PHP apps.
There's also PHP to JAVA via things like Resin/Quercus. Again, it doesn't support everything...
Another thing to note is that if you use any non-standard PHP module, you aren't going to be able to convert that code to C++ or Java either. However...Let's take a look at PHP modules. They are ARE compiled in C++. So if you can build PHP modules that do things (like parse XML, etc.) then you are basically (minus some interaction) working at the same speed. Of course you can't just make a PHP module for every possible need and your entire app because you would have to recompile and it would be much more difficult to code, etc.
However...There are some handy PHP modules that can help with speed concerns. Though at the end of the day, we have this awesome thing known as "the cloud" and with it, we can scale our applications (PHP included) so it doesn't matter as much anymore. Hardware is becoming cheaper and cheaper. Amazon just lowered it's prices (again) speaking of.
So as long as you code your PHP app around the idea that it will need to one day scale...Then I think you're fine and I'm not really sure I'd even look at Facebook and what they did because when they did it, it was a completely different world and now trying to hold up that infrastructure and maintain it...Well, you get things like HipHop.
Now how is HipHop going to help you? It won't. It can't. You're starting fresh, you can use PHP 5.3. I'd highly recommend looking into PHP 5.3 frameworks and all the new benefits that PHP 5.3 brings to the table along with the SPL libraries and also think about your database too. You're most likely serving up content from a database, so check out MongoDB and other types of databases that are schema-less and document-oriented. They are much much faster and better for the most "common" type of web site/app.
Look at NEW companies like Foursquare and Smugmug and some other companies that are utilizing NEW technology and HOW they are using it. For as successful as Facebook is, I honestly would not look at them for "how" to build an efficient web site/app. I'm not saying they don't have very (very) talented people that work there that are solving (their) problems creatively...I'm also not saying that Facebook isn't a great idea in general and that it's not successful and that you shouldn't get ideas from it....I'm just saying that if you could view their entire source code, you probably wouldn't benefit from it.
I make moving the files and then do
git add -A
which put in the sataging area all deleted/new files. Here git realizes that the file is moved.
git commit -m "my message"
git push
I do not know why but this works for me.
I prefered to use an expression. This lets me do stuff like focus on a button when a field is valid, reaches a certain length, and of course after load.
<button type="button" moo-focus-expression="form.phone.$valid">
<button type="submit" moo-focus-expression="smsconfirm.length == 6">
<input type="text" moo-focus-expression="true">
On a complex form this also reduces need to create additional scope variables for the purposes of focusing.
Since you're passing in a reference type (a class) there is no need use ref
because per default only a reference to the actual object is passed and therefore you always change the object behind the reference.
Example:
public void Foo()
{
MyClass myObject = new MyClass();
myObject.Name = "Dog";
Bar(myObject);
Console.WriteLine(myObject.Name); // Writes "Cat".
}
public void Bar(MyClass someObject)
{
someObject.Name = "Cat";
}
As long you pass in a class you don't have to use ref
if you want to change the object inside your method.
assertTrue
will fail if the checked value is false, and assertFalse
will do the opposite: fail if the checked value is true.
Another thing, your last assertEquals will very likely fail, as it will compare the "Book was already checked out" string with the output of m1.checkOut(b1,p2). It needs a third parameter (the second value to check for equality).
You can do trickery by using exec() to invoke something that can do HTTP requests, like wget
, but you must direct all output from the program to somewhere, like a file or /dev/null, otherwise the PHP process will wait for that output.
If you want to separate the process from the apache thread entirely, try something like (I'm not sure about this, but I hope you get the idea):
exec('bash -c "wget -O (url goes here) > /dev/null 2>&1 &"');
It's not a nice business, and you'll probably want something like a cron job invoking a heartbeat script which polls an actual database event queue to do real asynchronous events.
I saw answers using the http, https, and request modules. I'd like to add one using yet another native NodeJS module that supports either the http or https protocol:
I've referenced the official NodeJS API, as well as some of the other answers on this question for something I'm doing. The following was the test I wrote to try it out, which worked as intended:
import * as fs from 'fs';
import * as _path from 'path';
import * as http2 from 'http2';
/* ... */
async function download( host, query, destination )
{
return new Promise
(
( resolve, reject ) =>
{
// Connect to client:
const client = http2.connect( host );
client.on( 'error', error => reject( error ) );
// Prepare a write stream:
const fullPath = _path.join( fs.realPathSync( '.' ), destination );
const file = fs.createWriteStream( fullPath, { flags: "wx" } );
file.on( 'error', error => reject( error ) );
// Create a request:
const request = client.request( { [':path']: query } );
// On initial response handle non-success (!== 200) status error:
request.on
(
'response',
( headers/*, flags*/ ) =>
{
if( headers[':status'] !== 200 )
{
file.close();
fs.unlink( fullPath, () => {} );
reject( new Error( `Server responded with ${headers[':status']}` ) );
}
}
);
// Set encoding for the payload:
request.setEncoding( 'utf8' );
// Write the payload to file:
request.on( 'data', chunk => file.write( chunk ) );
// Handle ending the request
request.on
(
'end',
() =>
{
file.close();
client.close();
resolve( { result: true } );
}
);
/*
You can use request.setTimeout( 12000, () => {} ) for aborting
after period of inactivity
*/
// Fire off [flush] the request:
request.end();
}
);
}
Then, for example:
/* ... */
let downloaded = await download( 'https://gitlab.com', '/api/v4/...', 'tmp/tmpFile' );
if( downloaded.result )
{
// Success!
}
// ...
External References
EDIT Information
function
declaration, which our contributor has so promptly added. Thanks!To clarify why the other answers can not work:
System.gc()
(along with Runtime.getRuntime().gc()
, which does the exact same thing) hints that you want stuff destroyed. Vaguely. The JVM is free to ignore requests to run a GC cycle, if it doesn't see the need for one. Plus, unless you've nulled out all reachable references to the object, GC won't touch it anyway. So A and B are both disqualified.
Runtime.getRuntime.gc()
is bad grammar. getRuntime
is a function, not a variable; you need parentheses after it to call it. So B is double-disqualified.
Object
has no delete
method. So C is disqualified.
While Object
does have a finalize
method, it doesn't destroy anything. Only the garbage collector can actually delete an object. (And in many cases, they technically don't even bother to do that; they just don't copy it when they do the others, so it gets left behind.) All finalize
does is give an object a chance to clean up before the JVM discards it. What's more, you should never ever be calling finalize
directly. (As finalize
is protected, the JVM won't let you call it on an arbitrary object anyway.) So D is disqualified.
Besides all that, object.doAnythingAtAllEvenCommitSuicide()
requires that running code have a reference to object
. That alone makes it "alive" and thus ineligible for garbage collection. So C and D are double-disqualified.
Underscore-java library has methods U.formatJson(json)
and U.formatXml(xml)
. I am the maintainer of the project.
Could be your initMap function is in a $(document).ready function. If it is then it won't work, it has to be outside of any other functions.
By Default angular return responseType as Json, but we can configure below types according to your requirement.
responseType: 'arraybuffer'|'blob'|'json'|'text'
Ex:
this.http.post(
'http://localhost:8080/order/addtocart',
{ dealerId: 13, createdBy: "-1", productId, quantity },
{ headers, responseType: 'text'});
You can not make reference to static variable from non-static method. To understand this , you need to understand the difference between static and non-static.
Static variables are class variables , they belong to class with their only one instance , created at the first only. Non-static variables are initialized every time you create an object of the class.
Now coming to your question, when you use new() operator we will create copy of every non-static filed for every object, but it is not the case for static fields. That's why it gives compile time error if you are referencing a static variable from non-static method.
Swift iOS:
Just For Information : I have used this:
extension String {
func urlEncode() -> CFString {
return CFURLCreateStringByAddingPercentEscapes(
nil,
self,
nil,
"!*'();:@&=+$,/?%#[]",
CFStringBuiltInEncodings.UTF8.rawValue
)
}
}// end extension String
Here I present an alternative way to detect a browser, based on feature availability.
To detect only IE, you can use this:
if(/*@cc_on!@*/false || typeof ScriptEngineMajorVersion === "function")
{
//You are using IE>=4 (unreliable for IE11)
}
else
{
//You are using other browser
}
To detect the most popular browsers:
if(/*@cc_on!@*/false || typeof ScriptEngineMajorVersion === "function")
{
//You are using IE >= 4 (unreliable for IE11!!!)
}
else if(window.chrome)
{
//You are using Chrome or Chromium
}
else if(window.opera)
{
//You are using Opera >= 9.2
}
else if('MozBoxSizing' in document.body.style)
{
//You are using Firefox or Firefox based >= 3.2
}
else if({}.toString.call(window.HTMLElement).indexOf('Constructor')+1)
{
//You are using Safari >= 3.1
}
else
{
//Unknown
}
This answer was updated because IE11 no longer supports conditional compilation (the /*@cc_on!@*/false
trick).
You can check Did IE11 remove javascript conditional compilation? for more informations regarding this topic.
I've used the suggestion they presented there.
Alternatively, you can use typeof document.body.style.msTransform == "string"
or document.body.style.msTransform !== window.undefined
or even 'msTransform' in document.body.style
.
It's actually Document Object Model. HTML is used to build the DOM which is an in-memory representation of the page (while closely related to HTML, they are not exactly the same thing). Things like CSS and Javascript interact with the DOM.
The cleanest method would be to add a class with pointer-events:none when you want to disable a click. It would function like a normal label.
.disableClick{
pointer-events: none;
}
Evaluation of main answers with a performance benchmark which confirms concerns that the current chosen answer makes costly regex operations under the hood
To date the provided answers come in 3 main styles (ignoring the JavaScript answer ;) ):
In terms of code size clearly the String.replace is the most terse. The simple Java implementation is slightly smaller and cleaner (IMHO) than the Lambda (don't get me wrong - I use Lambdas often where they are appropriate)
Execution speed was, in order of fastest to slowest: simple Java implementation, Lambda and then String.replace() (that invokes regex).
By far the fastest implementation was the simple Java implementation tuned so that it preallocates the StringBuilder buffer to the max possible result length and then simply appends chars to the buffer that are not in the "chars to delete" string. This avoids any reallocates that would occur for Strings > 16 chars in length (the default allocation for StringBuilder) and it avoids the "slide left" performance hit of deleting characters from a copy of the string that occurs is the Lambda implementation.
The code below runs a simple benchmark test, running each implementation 1,000,000 times and logs the elapsed time.
The exact results vary with each run but the order of performance never changes:
Start simple Java implementation
Time: 157 ms
Start Lambda implementation
Time: 253 ms
Start String.replace implementation
Time: 634 ms
The Lambda implementation (as copied from Kaplan's answer) may be slower because it performs a "shift left by one" of all characters to the right of the character being deleted. This would obviously get worse for longer strings with lots of characters requiring deletion. Also there might be some overhead in the Lambda implementation itself.
The String.replace implementation, uses regex and does a regex "compile" at each call. An optimization of this would be to use regex directly and cache the compiled pattern to avoid the cost of compiling it each time.
package com.sample;
import java.util.function.BiFunction;
import java.util.stream.IntStream;
public class Main {
static public String deleteCharsSimple(String fromString, String charsToDelete)
{
StringBuilder buf = new StringBuilder(fromString.length()); // Preallocate to max possible result length
for(int i = 0; i < fromString.length(); i++)
if (charsToDelete.indexOf(fromString.charAt(i)) < 0)
buf.append(fromString.charAt(i)); // char not in chars to delete so add it
return buf.toString();
}
static public String deleteCharsLambda(String fromString1, String charsToDelete)
{
BiFunction<String, String, String> deleteChars = (fromString, chars) -> {
StringBuilder buf = new StringBuilder(fromString);
IntStream.range(0, buf.length()).forEach(i -> {
while (i < buf.length() && chars.indexOf(buf.charAt(i)) >= 0)
buf.deleteCharAt(i);
});
return (buf.toString());
};
return deleteChars.apply(fromString1, charsToDelete);
}
static public String deleteCharsReplace(String fromString, String charsToDelete)
{
return fromString.replace(charsToDelete, "");
}
public static void main(String[] args)
{
String str = "XXXTextX XXto modifyX";
String charsToDelete = "X"; // Should only be one char as per OP's requirement
long start, end;
System.out.println("Start simple");
start = System.currentTimeMillis();
for (int i = 0; i < 1000000; i++)
deleteCharsSimple(str, charsToDelete);
end = System.currentTimeMillis();
System.out.println("Time: " + (end - start));
System.out.println("Start lambda");
start = System.currentTimeMillis();
for (int i = 0; i < 1000000; i++)
deleteCharsLambda(str, charsToDelete);
end = System.currentTimeMillis();
System.out.println("Time: " + (end - start));
System.out.println("Start replace");
start = System.currentTimeMillis();
for (int i = 0; i < 1000000; i++)
deleteCharsReplace(str, charsToDelete);
end = System.currentTimeMillis();
System.out.println("Time: " + (end - start));
}
}
Yes. You need to use the "Searched" form rather than the "Simple" form of the CASE
expression
SELECT CASE
WHEN c.Number IN ( '1121231', '31242323' ) THEN 1
WHEN c.Number IN ( '234523', '2342423' ) THEN 2
END AS Test
FROM tblClient c
render
will be called every time you setState
to re-render the component if there are changes. If you move your call to drawGrid
there rather than calling it in your update*
methods, you shouldn't have a problem.
If that doesn't work for you, there is also an overload of setState
that takes a callback as a second parameter. You should be able to take advantage of that as a last resort.
In rails 5, we need to add 2 lines of code
skip_before_action :verify_authenticity_token
protect_from_forgery prepend: true, with: :exception
The much simpler method is to use the decode
method of Integer
so for example:
int helloInt = Integer.decode(hello);
In your Jest configuration, add setupFilesAfterEnv: ["./setupTests.js"], create that file, and add the code you want to run before the tests:
// setupTests.js
window.crypto = {
.....
};
Reference: setupFilesAfterEnv [array]
I just wanted to extend Alex's great answer to make it appropriate if you happen to want to duplicate an entire set of records:
SET @x=7;
CREATE TEMPORARY TABLE tmp SELECT * FROM invoices;
UPDATE tmp SET id=id+@x;
INSERT INTO invoices SELECT * FROM tmp;
I just had to do this and found Alex's answer a perfect jumping off point!. Of course, you have to set @x to the highest row number in the table (I'm sure you could grab that with a query). This is only useful in this very specific situation, so be careful using it when you don't wish to duplicate all rows. Adjust the math as necessary.
You can use scanf function to read string
scanf("%[^\n]",name);
i don't know about other better options to receive string,
A way to edit the .zshrc file without doing it through iTerm2 or native Terminal on macOS is to use a terminal in another application. For example, I used the terminal as part of VSCode and was able to find and edit the file.
If you are using Jquery 1.6 or above, use prop to access the value.
$(document).prop('scrollHeight')
Previous versions used to get the value from attr but not post 1.6.
Another way to use OVER is to have a result column in your select operate on another "partition", so to say.
This:
SELECT
name,
ssn,
case
when ( count(*) over (partition by ssn) ) > 1
then 1
else 0
end AS hasDuplicateSsn
FROM table;
returns 1 in hasDuplicateSsn for each row whose ssn is shared by another row. Great for making "tags" for data for different error reports and such.
Concision counts: I prefer window.location = "?single";
or window.location += "?single";
You have committed to BRANCH1 and want to get rid of this commit without losing the changes? git reset is what you need. Do:
git branch BRANCH2
if you want BRANCH2 to be a new branch. You can also merge this at the end with another branch if you want. If BRANCH2 already exists, then leave this step out.
Then do:
git reset --hard HEAD~3
if you want to reset the commit on the branch you have committed. This takes the changes of the last three commits.
Then do the following to bring the resetted commits to BRANCH2
git checkout BRANCH2
This source was helpful: https://git-scm.com/docs/git-reset#git-reset-Undoacommitmakingitatopicbranch
I suggest that you give an if to the div than:
$("#my_div_id").html();
BalusC gave a good description about the problem but it lacks a good end to end code that users can pick and test it for themselves.
Best practice is to always store date-time in UTC timezone in DB. Sql timestamp type does not have timezone info.
When writing datetime value to sql db
//Convert the time into UTC and build Timestamp object.
Timestamp ts = Timestamp.valueOf(LocalDateTime.now(ZoneId.of("UTC")));
//use setTimestamp on preparedstatement
preparedStatement.setTimestamp(1, ts);
When reading the value back from DB into java,
Then, change it to your desired timezone. Here I am changing it to Toronto timezone.
ResultSet resultSet = preparedStatement.executeQuery();
resultSet.next();
Timestamp timestamp = resultSet.getTimestamp(1);
ZonedDateTime timeInUTC = timestamp.toLocalDateTime().atZone(ZoneId.of("UTC"));
LocalDateTime timeInToronto = LocalDateTime.ofInstant(timeInUTC.toInstant(), ZoneId.of("America/Toronto"));
To make reading of this page more valuable (for future search results) I made a list of libraries known to me.. As @CommonsWare mentioned there are super-similar questions/answers.. Anyway some libraries that can be used for making charts are:
Open Source:
Paid:
** - means I didn't try those so I can't really recommend it but other users suggested it..
For better browser compatibility you can rely on a regular expression. This will work in all web browsers released in the last 20 years:
String.prototype.equalsci = function(s) {
var regexp = RegExp("^"+this.replace(/[.\\+*?\[\^\]$(){}=!<>|:-]/g, "\\$&")+"$", "i");
return regexp.test(s);
}
"PERSON@Ü.EXAMPLE.COM".equalsci("person@ü.example.com")// returns true
This is different from the other answers found here because it takes into account that not all users are using modern web browsers.
Note: If you need to support unusual cases like the Turkish language you will need to use localeCompare because i and I are not the same letter in Turkish.
"I".localeCompare("i", undefined, { sensitivity:"accent"})===0// returns true
"I".localeCompare("i", "tr", { sensitivity:"accent"})===0// returns false
In addition to above answers,
Just make sure you set estimatedItemSize property of UICollectionViewFlowLayout to some size and do not implement sizeForItem:atIndexPath delegate method.
That's it.
Here is the angularJs source code for parsing url query parameters into an Object :
function tryDecodeURIComponent(value) {_x000D_
try {_x000D_
return decodeURIComponent(value);_x000D_
} catch (e) {_x000D_
// Ignore any invalid uri component_x000D_
}_x000D_
}_x000D_
_x000D_
function isDefined(value) {return typeof value !== 'undefined';}_x000D_
_x000D_
function parseKeyValue(keyValue) {_x000D_
keyValue = keyValue.replace(/^\?/, '');_x000D_
var obj = {}, key_value, key;_x000D_
var iter = (keyValue || "").split('&');_x000D_
for (var i=0; i<iter.length; i++) {_x000D_
var kValue = iter[i];_x000D_
if (kValue) {_x000D_
key_value = kValue.replace(/\+/g,'%20').split('=');_x000D_
key = tryDecodeURIComponent(key_value[0]);_x000D_
if (isDefined(key)) {_x000D_
var val = isDefined(key_value[1]) ? tryDecodeURIComponent(key_value[1]) : true;_x000D_
if (!hasOwnProperty.call(obj, key)) {_x000D_
obj[key] = val;_x000D_
} else if (isArray(obj[key])) {_x000D_
obj[key].push(val);_x000D_
} else {_x000D_
obj[key] = [obj[key],val];_x000D_
}_x000D_
}_x000D_
}_x000D_
};_x000D_
return obj;_x000D_
}_x000D_
_x000D_
alert(JSON.stringify(parseKeyValue('?a=1&b=3&c=m2-m3-m4-m5')));
_x000D_
You can add this function to window.location
:
window.location.query = function query(arg){
q = parseKeyValue(this.search);
if (!isDefined(arg)) {
return q;
}
if (q.hasOwnProperty(arg)) {
return q[arg];
} else {
return "";
}
}
// assuming you have this url :
// http://www.test.com/t.html?a=1&b=3&c=m2-m3-m4-m5
console.log(window.location.query())
// Object {a: "1", b: "3", c: "m2-m3-m4-m5"}
console.log(window.location.query('c'))
// "m2-m3-m4-m5"
I hear your point at wanting one assembly to stop repeated code but, It would be simplest and reduce code repetition and make it easier to reuse your code in other ways in future if...... you to break it into 3 assemblies.
<?php
$terms = get_the_terms( $post->ID, 'taxonomy');
foreach ( $terms as $term ) {
$termID[] = $term->term_id;
}
echo $termID[0];
?>
Since this answer still gets voted up, I want to point out that you should almost never need to look in the header files. If you want to write reliable code, you're much better served by looking in the standard. A better question than "how is off_t
defined on my machine" is "how is off_t
defined by the standard?". Following the standard means that your code will work today and tomorrow, on any machine.
In this case, off_t
isn't defined by the C standard. It's part of the POSIX standard, which you can browse here.
Unfortunately, off_t
isn't very rigorously defined. All I could find to define it is on the page on sys/types.h
:
blkcnt_t
andoff_t
shall be signed integer types.
This means that you can't be sure how big it is. If you're using GNU C, you can use the instructions in the answer below to ensure that it's 64 bits. Or better, you can convert to a standards defined size before putting it on the wire. This is how projects like Google's Protocol Buffers work (although that is a C++ project).
So, I think "where do I find the definition in my header files" isn't the best question. But, for completeness here's the answer:
On my machine (and most machines using glibc) you'll find the definition in bits/types.h
(as a comment says at the top, never directly include this file), but it's obscured a bit in a bunch of macros. An alternative to trying to unravel them is to look at the preprocessor output:
#include <stdio.h>
#include <sys/types.h>
int main(void) {
off_t blah;
return 0;
}
And then:
$ gcc -E sizes.c | grep __off_t
typedef long int __off_t;
....
However, if you want to know the size of something, you can always use the sizeof()
operator.
Edit: Just saw the part of your question about the __
. This answer has a good discussion. The key point is that names starting with __
are reserved for the implementation (so you shouldn't start your own definitions with __
).
Ok, finally found the solution.
Probably due to lack of experience with ReactJS and web development...
var Task = React.createClass({
render: function() {
var percentage = this.props.children + '%';
....
<div className="ui-progressbar-value ui-widget-header ui-corner-left" style={{width : percentage}}/>
...
I created the percentage variable outside in the render function.
I've started a project to help people making their first GitHub pull request. You can do the hands-on tutorial to make your first PR here
The workflow is simple as
git clone <clone url you copied earlier>
git checkout -b branch-name
git commit
git push origin branch-name
Compare and pull request
buttonEvery class has a nil?
method:
if a_variable.nil?
# the variable has a nil value
end
And strings have the empty?
method:
if a_string.empty?
# the string is empty
}
Remember that a string does not equal nil
when it is empty, so use the empty?
method to check if a string is empty.
Here is a very simple way to create an IP certificate that Chrome will trust.
The ssl.conf file...
[ req ]
default_bits = 4096
distinguished_name = req_distinguished_name
req_extensions = req_ext
prompt = no
[ req_distinguished_name ]
commonName = 192.168.1.10
[ req_ext ]
subjectAltName = IP:192.168.1.10
Where, of course 192.168.1.10 is the local network IP we want Chrome to trust.
Create the certificate:
openssl genrsa -out key1.pem
openssl req -new -key key1.pem -out csr1.pem -config ssl.conf
openssl x509 -req -days 9999 -in csr1.pem -signkey key1.pem -out cert1.pem -extensions req_ext -extfile ssl.conf
rm csr1.pem
On Windows import the certificate into the Trusted Root Certificate Store on all client machines. On Android Phone or Tablet download the certificate to install it. Now Chrome will trust the certificate on windows and Android.
On windows dev box the best place to get openssl.exe is from "c:\Program Files\Git\usr\bin\openssl.exe"
I don't use the same version, but uninstall actions are the same: Looking for file uninstall-postgresql inside directory
/Library/PostgreSQL/9.6
then run it.
(Screenshot in macOS 10.13)
then
sudo rm -rf /Library/PostgreSQL/
to delete all unnecessary directory.
=IF(ISNA(INDEX(B:B,MATCH(C2,A:A,0))),"",INDEX(B:B,MATCH(C2,A:A,0)))
Will return the answer you want and also remove the #N/A
result that would appear if you couldn't find a result due to it not appearing in your lookup list.
Ross
We use float, but any flavor of numeric with 6 decimal places should also work.
Based on what I read from different sources:
An await
expression does not block the thread on which it is executing. Instead, it causes the compiler to sign up the rest of the async
method as a continuation on the awaited task. Control then returns to the caller of the async
method. When the task completes, it invokes its continuation, and execution of the async
method resumes where it left off.
To wait for a single task
to complete, you can call its Task.Wait
method. A call to the Wait
method blocks the calling thread until the single class instance has completed execution. The parameterless Wait()
method is used to wait unconditionally until a task completes. The task simulates work by calling the Thread.Sleep
method to sleep for two seconds.
This article is also a good read.
You've probably miss-typed something above that bit of code or created your own class called IPAddress. If you're using the .net one, that function should be available.
Have you tried using System.Net.IPAddress just in case?
System.Net.IPAddress ipaddress = System.Net.IPAddress.Parse("127.0.0.1"); //127.0.0.1 as an example
The docs on Microsoft's site have a complete example which works fine on my machine.
Following the accepted answer by ChrLipp using Android Studio 1.2.2 in Ubuntu 14.04:
This worked for me. Try rebooting your system if it is not working for you.
If possible, you'd be better off handling the load
event within the iframe's document and calling out to a function in the containing document. This has the advantage of working in all browsers and only running once.
In the main document:
function iframeLoaded() {
alert("Iframe loaded!");
}
In the iframe document:
window.onload = function() {
parent.iframeLoaded();
}
This is a sample simplelogger.properties
which you can place on the classpath (uncomment the properties you wish to use):
# SLF4J's SimpleLogger configuration file
# Simple implementation of Logger that sends all enabled log messages, for all defined loggers, to System.err.
# Default logging detail level for all instances of SimpleLogger.
# Must be one of ("trace", "debug", "info", "warn", or "error").
# If not specified, defaults to "info".
#org.slf4j.simpleLogger.defaultLogLevel=info
# Logging detail level for a SimpleLogger instance named "xxxxx".
# Must be one of ("trace", "debug", "info", "warn", or "error").
# If not specified, the default logging detail level is used.
#org.slf4j.simpleLogger.log.xxxxx=
# Set to true if you want the current date and time to be included in output messages.
# Default is false, and will output the number of milliseconds elapsed since startup.
#org.slf4j.simpleLogger.showDateTime=false
# The date and time format to be used in the output messages.
# The pattern describing the date and time format is the same that is used in java.text.SimpleDateFormat.
# If the format is not specified or is invalid, the default format is used.
# The default format is yyyy-MM-dd HH:mm:ss:SSS Z.
#org.slf4j.simpleLogger.dateTimeFormat=yyyy-MM-dd HH:mm:ss:SSS Z
# Set to true if you want to output the current thread name.
# Defaults to true.
#org.slf4j.simpleLogger.showThreadName=true
# Set to true if you want the Logger instance name to be included in output messages.
# Defaults to true.
#org.slf4j.simpleLogger.showLogName=true
# Set to true if you want the last component of the name to be included in output messages.
# Defaults to false.
#org.slf4j.simpleLogger.showShortLogName=false
Even with something like an ArrayList or Vector, where "get" is a simple array lookup, the second loop still has additional overhead that the first one doesn't. I would expect it to be a tiny bit slower than the first.
Different ways to replace NULL in sql server
Replacing NULL value using:
1. ISNULL() function
2. COALESCE() function
3. CASE Statement
SELECT Name as EmployeeName, ISNULL(Bonus,0) as EmployeeBonus from tblEmployee
SELECT Name as EmployeeName, COALESCE(Bonus, 0) as EmployeeBonus
FROM tblEmployee
SELECT Name as EmployeeName, CASE WHEN Bonus IS NULL THEN 0
ELSE Bonus END as EmployeeBonus
FROM tblEmployee
Just to enhance @adivis12 answer, you don't need to do the if
statement. Put it like this:
fig, ax = plt.subplots()
for BAR in dict_of_dfs.keys():
dict_of_dfs[BAR].plot(ax=ax)
It should be as simple as using a list of receiving variables:
scanf("%i %i %i", &var1, &var2, &var3);
I am wondering which one of these is better in practice and why?
I've found that Lock
and Condition
(and other new concurrent
classes) are just more tools for the toolbox. I could do most everything I needed with my old claw hammer (the synchronized
keyword), but it was awkward to use in some situations. Several of those awkward situations became much simpler once I added more tools to my toolbox: a rubber mallet, a ball-peen hammer, a prybar, and some nail punches. However, my old claw hammer still sees its share of use.
I don't think one is really "better" than the other, but rather each is a better fit for different problems. In a nutshell, the simple model and scope-oriented nature of synchronized
helps protect me from bugs in my code, but those same advantages are sometimes hindrances in more complex scenarios. Its these more complex scenarios that the concurrent package was created to help address. But using this higher level constructs requires more explicit and careful management in the code.
===
I think the JavaDoc does a good job of describing the distinction between Lock
and synchronized
(the emphasis is mine):
Lock implementations provide more extensive locking operations than can be obtained using synchronized methods and statements. They allow more flexible structuring, may have quite different properties, and may support multiple associated Condition objects.
...
The use of synchronized methods or statements provides access to the implicit monitor lock associated with every object, but forces all lock acquisition and release to occur in a block-structured way: when multiple locks are acquired they must be released in the opposite order, and all locks must be released in the same lexical scope in which they were acquired.
While the scoping mechanism for synchronized methods and statements makes it much easier to program with monitor locks, and helps avoid many common programming errors involving locks, there are occasions where you need to work with locks in a more flexible way. For example, **some algorithms* for traversing concurrently accessed data structures require the use of "hand-over-hand" or "chain locking": you acquire the lock of node A, then node B, then release A and acquire C, then release B and acquire D and so on. Implementations of the Lock interface enable the use of such techniques by allowing a lock to be acquired and released in different scopes, and allowing multiple locks to be acquired and released in any order.
With this increased flexibility comes additional responsibility. The absence of block-structured locking removes the automatic release of locks that occurs with synchronized methods and statements. In most cases, the following idiom should be used:
...
When locking and unlocking occur in different scopes, care must be taken to ensure that all code that is executed while the lock is held is protected by try-finally or try-catch to ensure that the lock is released when necessary.
Lock implementations provide additional functionality over the use of synchronized methods and statements by providing a non-blocking attempt to acquire a lock (tryLock()), an attempt to acquire the lock that can be interrupted (lockInterruptibly(), and an attempt to acquire the lock that can timeout (tryLock(long, TimeUnit)).
...
public class GetUsers extends AsyncTask {
@Override
protected void onPreExecute() {
super.onPreExecute();
}
private String convertStreamToString(InputStream is) {
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
StringBuilder sb = new StringBuilder();
String line = null;
try {
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return sb.toString();
}
public String connect()
{
HttpClient httpclient = new DefaultHttpClient();
// Prepare a request object
HttpPost htopost = new HttpPost("URL");
htopost.setHeader(new BasicHeader("Authorization","Basic Og=="));
try {
JSONObject param = new JSONObject();
param.put("PageSize",100);
param.put("Userid",userId);
param.put("CurrentPage",1);
htopost.setEntity(new StringEntity(param.toString()));
// Execute the request
HttpResponse response;
response = httpclient.execute(htopost);
// Examine the response status
// Get hold of the response entity
HttpEntity entity = response.getEntity();
if (entity != null) {
// A Simple JSON Response Read
InputStream instream = entity.getContent();
String result = convertStreamToString(instream);
// A Simple JSONObject Creation
json = new JSONArray(result);
// Closing the input stream will trigger connection release
instream.close();
return ""+response.getStatusLine().getStatusCode();
}
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
@Override
protected String doInBackground(String... urls) {
return connect();
}
@Override
protected void onPostExecute(String status){
try {
if(status.equals("200"))
{
Global.defaultMoemntLsit.clear();
for (int i = 0; i < json.length(); i++) {
JSONObject ojb = json.getJSONObject(i);
UserMomentModel u = new UserMomentModel();
u.setId(ojb.getString("Name"));
u.setUserId(ojb.getString("ID"));
Global.defaultMoemntLsit.add(u);
}
userAdapter = new UserAdapter(getActivity(), Global.defaultMoemntLsit);
recycleView.setAdapter(userMomentAdapter);
recycleView.setLayoutManager(mLayoutManager);
}
}
catch (Exception e)
{
e.printStackTrace();
}
}
}
byte b = (byte)0xC8;
int v1 = b; // v1 is -56 (0xFFFFFFC8)
int v2 = b & 0xFF // v2 is 200 (0x000000C8)
Most of the time v2 is the way you really need.