A good middle-ground between enabling MARS and retrieving the entire result set into memory is to retrieve only IDs in an initial query, and then loop through the IDs materializing each entity as you go.
For example (using the "Blog and Posts" sample entities as in this answer):
using (var context = new BlogContext())
{
// Get the IDs of all the items to loop through. This is
// materialized so that the data reader is closed by the
// time we're looping through the list.
var blogIds = context.Blogs.Select(blog => blog.Id).ToList();
// This query represents all our items in their full glory,
// but, items are only materialized one at a time as we
// loop through them.
var blogs =
blogIds.Select(id => context.Blogs.First(blog => blog.Id == id));
foreach (var blog in blogs)
{
this.DoSomethingWith(blog.Posts);
context.SaveChanges();
}
}
Doing this means that you only pull a few thousand integers into memory, as opposed to thousands of entire object graphs, which should minimize memory usage while enabling you to work item-by-item without enabling MARS.
Another nice benefit of this, as seen in the sample, is that you can save changes as you loop through each item, instead of having to wait until the end of the loop (or some other such workaround), as would be needed even with MARS enabled (see here and here).
.set_title('') can be used to add title to Seaborn Plot
import seaborn as sb
sb.boxplot().set_title('Title')
My which pip
shows the following path:
$ which pip
/home/kmario23/anaconda3/bin/pip
So, whatever package I install using pip install <package-name>
will have to be reflected in the list of packages when the list is exported using:
$ conda list --export > conda_list.txt
But, I don't. So, instead I used the following command as suggested by several others:
# get environment name by
$ conda-env list
# get list of all installed packages by (conda, pip, etc.,)
$ conda-env export -n <my-environment-name> > all_packages.yml
# if you haven't created any specific env, then just use 'root'
Now, I can see all the packages in my all-packages.yml
file.
OK, for example you have the array below:
var num = [1, 2, 3, 4, 5];
And we want to delete number 4. You can simply use the below code:
num.splice(num.indexOf(4), 1); // num will be [1, 2, 3, 5];
If you are reusing this function, you write a reusable function which will be attached to the native array function like below:
Array.prototype.remove = Array.prototype.remove || function(x) {
const i = this.indexOf(x);
if(i===-1)
return;
this.splice(i, 1); // num.remove(5) === [1, 2, 3];
}
But how about if you have the below array instead with a few [5]s in the array?
var num = [5, 6, 5, 4, 5, 1, 5];
We need a loop to check them all, but an easier and more efficient way is using built-in JavaScript functions, so we write a function which use a filter like below instead:
const _removeValue = (arr, x) => arr.filter(n => n!==x);
//_removeValue([1, 2, 3, 4, 5, 5, 6, 5], 5) // Return [1, 2, 3, 4, 6]
Also there are third-party libraries which do help you to do this, like Lodash or Underscore. For more information, look at lodash _.pull, _.pullAt or _.without.
The below made sense for 2013. However, now, I would use the :not()
selector as described below.
CSS can be overwritten.
DEMO: http://jsfiddle.net/persianturtle/J4SUb/
Use this:
.parent {
padding: 50px;
border: 1px solid black;
}
.parent span {
position: absolute;
top: 200px;
padding: 30px;
border: 10px solid green;
}
.parent:hover span {
border: 10px solid red;
}
.parent span:hover {
border: 10px solid green;
}
_x000D_
<a class="parent">
Parent text
<span>Child text</span>
</a>
_x000D_
@SchizoDuckie's answer is very elegant and lightweight, but due to Webkit's lack of implementation for scrollHeight (see here), does not work on Webkit-based browsers (Safari, Chrome, various and sundry mobile platforms).
For this basic idea to work on Webkit along with Gecko and Trident browsers, one need only replace
<body onload='parent.resizeIframe(document.body.scrollHeight)'>
with
<body onload='parent.resizeIframe(document.body.offsetHeight)'>
So long as everything is on the same domain, this works quite well.
You can change the font size in R Markdown with HTML code tags <font size="1"> your text </font>
. This code is added to the R Markdown document and will alter the output of the HTML output.
For example:
<font size="1"> This is my text number1</font> _x000D_
_x000D_
<font size="2"> This is my text number 2 </font>_x000D_
_x000D_
<font size="3"> This is my text number 3</font> _x000D_
_x000D_
<font size="4"> This is my text number 4</font> _x000D_
_x000D_
<font size="5"> This is my text number 5</font> _x000D_
_x000D_
<font size="6"> This is my text number 6</font>
_x000D_
Let's take this:
class Person(val name:String,var age:Int )
def person =new Person("Kumar",12)
person.age=20
println(person.age)
and rewrite it with equivalent code
class Person(val name:String,var age:Int )
def person =new Person("Kumar",12)
(new Person("Kumar", 12)).age_=(20)
println((new Person("Kumar", 12)).age)
See, def
is a method. It will execute each time it is called, and each time it will return (a) new Person("Kumar", 12)
. And these is no error in the "assignment" because it isn't really an assignment, but just a call to the age_=
method (provided by var
).
I noticed that when it's set to false, I'm able to see the value of an item using the debugger. When it was set to true, I was getting an error - item.FullName.GetValue The embedded interop type 'FullName' does not contain a definition for 'QBFC11Lib.IItemInventoryRet' since it was not used in the compiled assembly. Consider casting to object or changing the 'Embed Interop Types' property to true.
Why not fold in the data that you receive with the existing cache? Otherwise it's not really 'refreshing', it's 'starting again' and you might as well drop/delete the SQLLite file and start again (assuming you're not persisting other data as well).
first convert your date string to date
then convert it to timestamp
by using following set of line
Date date=new Date();
Timestamp timestamp = new Timestamp(date.getTime());//instead of date put your converted date
Timestamp myTimeStamp= timestamp;
[ngStyle]="{'opacity': is_mail_sent ? '0.5' : '1' }"
I've created a module called cors-bypass
, that allows you to do this without the need for a server. It uses postMessage
to send cross-domain events, which is used to provide mock HTTP APIs (fetch
, WebSocket
, XMLHTTPRequest
etc.).
It fundamentally does the same as the answer by Endless, but requires no code changes to use it.
Example usage:
import { Client, WebSocket } from 'cors-bypass'
const client = new Client()
await client.openServerInNewTab({
serverUrl: 'http://random-domain.com/server.html',
adapterUrl: 'https://your-site.com/adapter.html'
})
const ws = new WebSocket('ws://echo.websocket.org')
ws.onopen = () => ws.send('hello')
ws.onmessage = ({ data }) => console.log('received', data)
In Python 2.6, using chain.from_iterable()
:
>>> from itertools import chain
>>> list(chain.from_iterable(mi.image_set.all() for mi in h.get_image_menu()))
It avoids creating of intermediate list.
You can try cactoos for that.
final InputStream input = new InputStreamOf("example");
The object is created with new
and not a static method for a reason.
Try adding this in your vhost config:
RewriteEngine On
RewriteRule ^(.*)$ https://%{HTTP_HOST}$1 [R=301,L]
As of feb 2019 .addEventListener()
is not currently work with jQuery .trigger()
or .change()
, you can test it below using Chrome or Firefox.
txt.addEventListener('input', function() {_x000D_
console.log('not called?');_x000D_
})_x000D_
$('#txt').val('test').trigger('input');_x000D_
$('#txt').trigger('input');_x000D_
$('#txt').change();
_x000D_
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>_x000D_
<input type="text" id="txt">
_x000D_
you have to use .dispatchEvent()
instead.
txt.addEventListener('input', function() {_x000D_
console.log('it works!');_x000D_
})_x000D_
$('#txt').val('yes')_x000D_
txt.dispatchEvent(new Event('input'));
_x000D_
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>_x000D_
_x000D_
<input type="text" id="txt">
_x000D_
I changed your solution, so that it works in all modern browsers:
css snippet:
-webkit-transition: height 1s ease-in-out;
-moz-transition: height 1s ease-in-out;
-ms-transition: height 1s ease-in-out;
-o-transition: height 1s ease-in-out;
transition: height 1s ease-in-out;
js snippet:
var clone = $('#this').clone()
.css({'position':'absolute','visibility':'hidden','height':'auto'})
.addClass('slideClone')
.appendTo('body');
var newHeight = $(".slideClone").height();
$(".slideClone").remove();
$('#this').css('height',newHeight + 'px');
here's the full example http://jsfiddle.net/RHPQd/
use below statement if safe_mode
is off
set_time_limit(0);
When you use a blade echo {{ $data }}
it will automatically escape the output. It can only escape strings. In your data $data->ac
is an array and $data
is an object, neither of which can be echoed as is. You need to be more specific of how the data should be outputted. What exactly that looks like entirely depends on what you're trying to accomplish. For example to display the link you would need to do {{ $data->ac[0][0]['url'] }}
(not sure why you have two nested arrays but I'm just following your data structure).
@foreach($data->ac['0'] as $link)
<a href="{{ $link['url'] }}">This is a link</a>
@endforeach
Or without (
and the need to escape it:
find . -not -name "*.exe" -not -name "*.dll"
and to also exclude the listing of directories
find . -not -name "*.exe" -not -name "*.dll" -not -type d
or in positive logic ;-)
find . -not -name "*.exe" -not -name "*.dll" -type f
You're using share folders, so you need to install VirtualBox Guest Additions inside your virtual machine to support that feature.
If you're using Vagrant (OS X: brew cask install vagrant
), run:
vagrant plugin install vagrant-vbguest
vagrant vbguest
In case it fails, check the logs, e.g.
vagrant ssh -c "cat /var/log/vboxadd-install.log"
Maybe you're just missing the kernel header files.
Inside VM, you should install Guest Additions, kernel headers and start the service and double check if kernel extension is running.
This depends on the guest operating system, so here are brief steps:
Install kernel include headers (required by VBoxLinuxAdditions).
sudo apt-get update && sudo apt-get install kernel-devel
sudo yum update && sudo yum -y install kernel-headers kernel-devel
Install Guest Additions (this depends on the operating system).
Ubuntu: sudo apt-get -y install dkms build-essential linux-headers-$(uname -r) virtualbox-guest-additions-iso
If you can't find it, check by aptitude search virtualbox
.
Debian: sudo apt-get -y install build-essential module-assistant virtualbox-ose-guest-utils
If you can't find it, check by dpkg -l | grep virtualbox
.
manually by downloading the iso file inside VM (e.g. wget
) and installing it, e.g.
wget http://download.virtualbox.org/virtualbox/5.0.16/VBoxGuestAdditions_5.0.16.iso -P /tmp
sudo mount -o loop /tmp/VBoxGuestAdditions_5.0.16.iso /mnt
sudo sh -x /mnt/VBoxLinuxAdditions.run # --keep
Extra debug: cd ~/install && sh -x ./install.sh /mnt/VBoxLinuxAdditions.run
Double check that kernel extensions are up and running:
sudo modprobe vboxsf
Start/restart the service:
sudo /opt/VBoxGuestAdditions*/init/vboxadd setup
(add sudo sh -x
to debug)sudo /etc/init.d/vboxadd-service start
sudo /etc/init.d/vboxdrv setup
sudo service VBoxService start
If above didn't work, here are more sophisticated steps to fix it. This assumes that you've already VBoxGuestAdditions installed (as shown above).
The most common reason why mounting shared folder doesn't work may related to building Guest Additions module which failed. If in /var/log/vboxadd-install.log
you've the following error:
The headers for the current running kernel were not found.
this means either you didn't install kernel sources, or they cannot be found.
If you installed them already as instructed above, run this command:
$ sudo sh -x /opt/VBoxGuestAdditions-5.0.16/init/vboxadd setup 2>&1 | grep KERN
+ KERN_VER=2.6.32-573.18.1.el6.x86_64
+ KERN_DIR=/lib/modules/2.6.32-573.18.1.el6.x86_64/build
So basically vboxadd
script is expecting your kernel sources to be available at the following dir:
ls -la /lib/modules/$(uname -r)/build
Check if the kernel dir exists (symbolic link points to the existing folder). If it's not, please install them to the right folder (e.g. in /usr/src/kernels
).
So vboxadd
script can enter your kernel source directory and run make kernelrelease
, get the value and compare with your current kernel version.
Here is the logic:
KERN_VER=`uname -r`
KERN_DIR="/lib/modules/$KERN_VER/build"
if [ -d "$KERN_DIR" ]; then
KERN_REL=`make -sC $KERN_DIR --no-print-directory kernelrelease 2>/dev/null || true`
if [ -z "$KERN_REL" -o "x$KERN_REL" = "x$KERN_VER" ]; then
return 0
fi
fi
If the kernel version doesn't match with the sources, maybe you've to upgrade your Linux kernel (in case the sources are newer than your kernel).
Try:
vagrant plugin install vagrant-vbguest vagrant vbgues
If won't work, try the following manual steps for CentOS:
$ sudo yum update
$ sudo yum install kernel-$(uname -r) kernel-devel kernel-headers # or: reinstall
$ rpm -qf /lib/modules/$(uname -r)/build
kernel-2.6.32-573.18.1.el6.x86_64
$ ls -la /lib/modules/$(uname -r)/build
$ sudo reboot # and re-login
$ sudo ln -sv /usr/src/kernels/$(uname -r) /lib/modules/$(uname -r)/build
$ sudo /opt/VBoxGuestAdditions-*/init/vboxadd setup
Use this for unix if you are transferring using winscp or ftp:
public static void isFileReady(File entry) throws Exception {
long realFileSize = entry.length();
long currentFileSize = 0;
do {
try (FileInputStream fis = new FileInputStream(entry);) {
currentFileSize = 0;
while (fis.available() > 0) {
byte[] b = new byte[1024];
int nResult = fis.read(b);
currentFileSize += nResult;
if (nResult == -1)
break;
}
} catch (Exception e) {
e.printStackTrace();
}
System.out.println("currentFileSize=" + currentFileSize + ", realFileSize=" + realFileSize);
} while (currentFileSize != realFileSize);
}
script(nonce="some-nonce").
console.log("test");
//- Workaround
<script nonce="some-nonce">console.log("test");</script>
Try to use the rack-cors gem. And add the header field in your Ajax call.
To build on Oli's solution (https://stackoverflow.com/a/5056797/2472351) using multimaps, you can replace the two template functions he used with the following:
template <typename A, typename B>
multimap<B, A> flip_map(map<A,B> & src) {
multimap<B,A> dst;
for(map<A, B>::const_iterator it = src.begin(); it != src.end(); ++it)
dst.insert(pair<B, A>(it -> second, it -> first));
return dst;
}
Here is an example program that shows all the key-value pairs being preserved after performing the flip.
#include <iostream>
#include <map>
#include <string>
#include <algorithm>
using namespace std;
template <typename A, typename B>
multimap<B, A> flip_map(map<A,B> & src) {
multimap<B,A> dst;
for(typename map<A, B>::const_iterator it = src.begin(); it != src.end(); ++it)
dst.insert(pair<B, A>(it -> second, it -> first));
return dst;
}
int main() {
map<string, int> test;
test["word"] = 1;
test["spark"] = 15;
test["the"] = 2;
test["mail"] = 3;
test["info"] = 3;
test["sandwich"] = 15;
cout << "Contents of original map:\n" << endl;
for(map<string, int>::const_iterator it = test.begin(); it != test.end(); ++it)
cout << it -> first << " " << it -> second << endl;
multimap<int, string> reverseTest = flip_map(test);
cout << "\nContents of flipped map in descending order:\n" << endl;
for(multimap<int, string>::const_reverse_iterator it = reverseTest.rbegin(); it != reverseTest.rend(); ++it)
cout << it -> first << " " << it -> second << endl;
cout << endl;
}
Result:
var result = from x in entity
join y in entity2
on new { X1= x.field1, X2= x.field2 } equals new { X1=y.field1, X2= y.field2 }
select new
{
/// Columns
};
Before installing libgtk2.0-dev and pkg-config or libqt4-dev. Make sure that you have uninstalled opencv. You can confirm this by running import cv2 on your python shell. If it fails, then install the needed packages and re-run cmake .
Although you must still either explicitly compare an optional with nil
or use optional binding to additionally extract its value (i.e. optionals are not implicitly converted into Boolean values), it's worth noting that Swift 2 has added the guard
statement to help avoid the pyramid of doom when working with multiple optional values.
In other words, your options now include explicitly checking for nil
:
if xyz != nil {
// Do something with xyz
}
Optional binding:
if let xyz = xyz {
// Do something with xyz
// (Note that we can reuse the same variable name)
}
And guard
statements:
guard let xyz = xyz else {
// Handle failure and then exit this code block
// e.g. by calling return, break, continue, or throw
return
}
// Do something with xyz, which is now guaranteed to be non-nil
Note how ordinary optional binding can lead to greater indentation when there is more than one optional value:
if let abc = abc {
if let xyz = xyz {
// Do something with abc and xyz
}
}
You can avoid this nesting with guard
statements:
guard let abc = abc else {
// Handle failure and then exit this code block
return
}
guard let xyz = xyz else {
// Handle failure and then exit this code block
return
}
// Do something with abc and xyz
This is from http://www.herongyang.com/Android/Debug-adb-logcat-Command-Debugging.html
You can use adb:
adb logcat AndroidRuntime:E *:S
Another way to do it:
MEDIA_ROOT = '/home/USER/Projects/REPO/src/PROJECT/APP/static/media/'
MEDIA_URL = '/static/media/'
This would require you to move your media folder to a sub directory of a static folder.
Then in your template you can use:
<img class="scale-with-grid" src="{{object.photo.url}}"/>
You can use DUMPBIN too. Use the /headers
or /all
flag and its the first file header listed.
dumpbin /headers cv210.dll
Microsoft (R) COFF/PE Dumper Version 10.00.30319.01
Copyright (C) Microsoft Corporation. All rights reserved.
Dump of file cv210.dll
PE signature found
File Type: DLL
FILE HEADER VALUES
8664 machine (x64)
6 number of sections
4BBAB813 time date stamp Tue Apr 06 12:26:59 2010
0 file pointer to symbol table
0 number of symbols
F0 size of optional header
2022 characteristics
Executable
Application can handle large (>2GB) addresses
DLL
Microsoft (R) COFF/PE Dumper Version 10.00.30319.01
Copyright (C) Microsoft Corporation. All rights reserved.
Dump of file acrdlg.dll
PE signature found
File Type: DLL
FILE HEADER VALUES
14C machine (x86)
5 number of sections
467AFDD2 time date stamp Fri Jun 22 06:38:10 2007
0 file pointer to symbol table
0 number of symbols
E0 size of optional header
2306 characteristics
Executable
Line numbers stripped
32 bit word machine
Debug information stripped
DLL
'find' can make life slightly easier:
dumpbin /headers cv210.dll |find "machine"
8664 machine (x64)
Using the builtin Date.parse
function which accepts input in ISO8601 format and directly returns the desired integer return value:
var dates_as_int = dates.map(Date.parse);
Calculate the difference between two dates:
$date1=date_create("2013-03-15");
$date2=date_create("2013-12-12");
$diff=date_diff($date1,$date2);
echo $diff->format("%R%a days");
Output: +272 days
The date_diff() function returns the difference between two DateTime objects.
You are the 742342nd user to ask this bash FAQ. The answer also describes the general case of variables set in subshells created by pipes:
E4) If I pipe the output of a command into
read variable
, why doesn't the output show up in$variable
when the read command finishes?This has to do with the parent-child relationship between Unix processes. It affects all commands run in pipelines, not just simple calls to
read
. For example, piping a command's output into awhile
loop that repeatedly callsread
will result in the same behavior.Each element of a pipeline, even a builtin or shell function, runs in a separate process, a child of the shell running the pipeline. A subprocess cannot affect its parent's environment. When the
read
command sets the variable to the input, that variable is set only in the subshell, not the parent shell. When the subshell exits, the value of the variable is lost.Many pipelines that end with
read variable
can be converted into command substitutions, which will capture the output of a specified command. The output can then be assigned to a variable:grep ^gnu /usr/lib/news/active | wc -l | read ngroup
can be converted into
ngroup=$(grep ^gnu /usr/lib/news/active | wc -l)
This does not, unfortunately, work to split the text among multiple variables, as read does when given multiple variable arguments. If you need to do this, you can either use the command substitution above to read the output into a variable and chop up the variable using the bash pattern removal expansion operators or use some variant of the following approach.
Say /usr/local/bin/ipaddr is the following shell script:
#! /bin/sh host `hostname` | awk '/address/ {print $NF}'
Instead of using
/usr/local/bin/ipaddr | read A B C D
to break the local machine's IP address into separate octets, use
OIFS="$IFS" IFS=. set -- $(/usr/local/bin/ipaddr) IFS="$OIFS" A="$1" B="$2" C="$3" D="$4"
Beware, however, that this will change the shell's positional parameters. If you need them, you should save them before doing this.
This is the general approach -- in most cases you will not need to set $IFS to a different value.
Some other user-supplied alternatives include:
read A B C D << HERE $(IFS=.; echo $(/usr/local/bin/ipaddr)) HERE
and, where process substitution is available,
read A B C D < <(IFS=.; echo $(/usr/local/bin/ipaddr))
In case you'd like to paste windows path from other source (say, File Explorer) - you can do so via input()
call in python console:
>>> input()
D:\EP\stuff\1111\this_is_a_long_path\you_dont_want\to_type\or_edit_by_hand
'D:\\EP\\stuff\\1111\\this_is_a_long_path\\you_dont_want\\to_type\\or_edit_by_hand'
Then just copy the result
The following signature will do:
List<Email> findByEmailIdInAndPincodeIn(List<String> emails, List<String> pinCodes);
Spring Data JPA supports a large number of keywords to build a query. IN
and AND
are among them.
You could do the following:
.interrupt
the working threads if they wait for data in some blocking call)writeBatch
in your case) to finish, by calling the Thread.join()
method on the working threads.Some sketchy code:
static volatile boolean keepRunning = true;
In run() you change to
for (int i = 0; i < N && keepRunning; ++i)
writeBatch(pw, i);
In main() you add:
final Thread mainThread = Thread.currentThread();
Runtime.getRuntime().addShutdownHook(new Thread() {
public void run() {
keepRunning = false;
mainThread.join();
}
});
That's roughly how I do a graceful "reject all clients upon hitting Control-C" in terminal.
From the docs:
When the virtual machine begins its shutdown sequence it will start all registered shutdown hooks in some unspecified order and let them run concurrently. When all the hooks have finished it will then run all uninvoked finalizers if finalization-on-exit has been enabled. Finally, the virtual machine will halt.
That is, a shutdown hook keeps the JVM running until the hook has terminated (returned from the run()-method.
You're almost correct, just misplaced a few quotes. Wrapping the whole thing in regular quotes will literally give you the string #demo + {this.state.id}
- you need to indicate which are variables and which are string literals. Since anything inside {}
is an inline JSX expression, you can do:
href={"#demo" + this.state.id}
This will use the string literal #demo
and concatenate it to the value of this.state.id
. This can then be applied to all strings. Consider this:
var text = "world";
And this:
{"Hello " + text + " Andrew"}
This will yield:
Hello world Andrew
You can also use ES6 string interpolation/template literals with ` (backticks) and ${expr}
(interpolated expression), which is closer to what you seem to be trying to do:
href={`#demo${this.state.id}`}
This will basically substitute the value of this.state.id
, concatenating it to #demo
. It is equivalent to doing: "#demo" + this.state.id
.
You are testing against the string minus the last character:
>>> '"xxx"'[:-1]
'"xxx'
Note how the last character, the "
, is not part of the output of the slice.
I think you wanted just to test against the last character; use [-1:]
to slice for just the last element.
However, there is no need to slice here; just use str.startswith()
and str.endswith()
directly.
Here's how I ended up doing this:
<div id="divform">
<form action="/system/wpacert" method="post" enctype="multipart/form-data" name="certform">
<div>Certificate 1: <input type="file" name="cert1"/></div>
<div>Certificate 2: <input type="file" name="cert2"/></div>
<div><input type="button" value="Upload" onclick="closeSelf();"/></div>
</form>
</div>
<div id="closelink" style="display:none">
<a href="javascript:window.close()">Click Here to Close this Page</a>
</div>
function closeSelf(){
document.forms['certform'].submit();
hide(document.getElementById('divform'));
unHide(document.getElementById('closelink'));
}
Where hide()
and unhide()
set the style.display
to 'none'
and 'block'
respectively.
Not exactly what I had in mind, but this will have to do for the time being. Works on IE, Safari, FF and Chrome.
That's what I got:
Scanner scanner = new Scanner(System.in);
System.out.println("Please enter a nickname!");
while (!scanner.hasNext("[a-zA-Z]{3,8}+")) {
System.out.println("Nickname should contain only Alphabetic letters! At least 3 and max 8 letters");
scanner.next();
}
String nickname = scanner.next();
System.out.println("Thank you! Got " + nickname);
Read about regex Pattern here: https://docs.oracle.com/javase/7/docs/api/java/util/regex/Pattern.html
#!/bin/bash
set -e
_onexit() {
[[ $TMPD ]] && rm -rf "$TMPD"
}
TMPD="$(mktemp -d)"
trap _onexit EXIT
_time_2() {
"$@" 2>&3
}
_time_1() {
time _time_2 "$@"
}
_time() {
declare time_label="$1"
shift
exec 3>&2
_time_1 "$@" 2>"$TMPD/timing.$time_label"
echo "time[$time_label]"
cat "$TMPD/timing.$time_label"
}
_time a _do_something
_time b _do_another_thing
_time c _finish_up
This has the benefit of not spawning sub shells, and the final pipeline has it's stderr restored to the real stderr.
public DataSet GetDataSet(string ConnectionString, string SQL)
{
SqlConnection conn = new SqlConnection(ConnectionString);
SqlDataAdapter da = new SqlDataAdapter();
SqlCommand cmd = conn.CreateCommand();
cmd.CommandText = SQL;
da.SelectCommand = cmd;
DataSet ds = new DataSet();
///conn.Open();
da.Fill(ds);
///conn.Close();
return ds;
}
I had the same problem. I had created a file named .env, but in reality the file ended up being .env.txt.
I created a new file, saved it in form of 'No Extension' and boom, the file was real .env and worked perfectly.
Maybe something like this:
<script>
if(!window.jQuery)
{
var script = document.createElement('script');
script.type = "text/javascript";
script.src = "path/to/jQuery";
document.getElementsByTagName('head')[0].appendChild(script);
}
</script>
To make the button is faded when disable, you can set alpha for it. There are two options for you:
First way: If you want to apply for all your buttons in your app, so you can write extension
for UIButton like this:
extension UIButton {
open override var isEnabled: Bool{
didSet {
alpha = isEnabled ? 1.0 : 0.5
}
}
}
Second way: If you just want to apply for some buttons in your app, so you can write a custom class from UIButton like below and use this class for which you want to apply:
class MyButton: UIButton {
override var isEnabled: Bool {
didSet {
alpha = isEnabled ? 1.0 : 0.5
}
}
}
That is very odd.
I went through ItemNotFoundException
's base classes and tested the following multiple catch
es to see what would catch it:
try {
remove-item C:\nonexistent\file.txt -erroraction stop
}
catch [System.Management.Automation.ItemNotFoundException] {
write-host 'ItemNotFound'
}
catch [System.Management.Automation.SessionStateException] {
write-host 'SessionState'
}
catch [System.Management.Automation.RuntimeException] {
write-host 'RuntimeException'
}
catch [System.SystemException] {
write-host 'SystemException'
}
catch [System.Exception] {
write-host 'Exception'
}
catch {
write-host 'well, darn'
}
As it turns out, the output was 'RuntimeException'
. I also tried it with a different exception CommandNotFoundException
:
try {
do-nonexistent-command
}
catch [System.Management.Automation.CommandNotFoundException] {
write-host 'CommandNotFoundException'
}
catch {
write-host 'well, darn'
}
That output 'CommandNotFoundException'
correctly.
I vaguely remember reading elsewhere (though I couldn't find it again) of problems with this. In such cases where exception filtering didn't work correctly, they would catch the closest Type
they could and then use a switch
. The following just catches Exception
instead of RuntimeException
, but is the switch
equivalent of my first example that checks all base types of ItemNotFoundException
:
try {
Remove-Item C:\nonexistent\file.txt -ErrorAction Stop
}
catch [System.Exception] {
switch($_.Exception.GetType().FullName) {
'System.Management.Automation.ItemNotFoundException' {
write-host 'ItemNotFound'
}
'System.Management.Automation.SessionStateException' {
write-host 'SessionState'
}
'System.Management.Automation.RuntimeException' {
write-host 'RuntimeException'
}
'System.SystemException' {
write-host 'SystemException'
}
'System.Exception' {
write-host 'Exception'
}
default {'well, darn'}
}
}
This writes 'ItemNotFound'
, as it should.
dtAll = dtOne.Copy();
dtAll.Merge(dtTwo,true);
The parameter TRUE preserve the changes.
For more details refer to MSDN.
As user @aaracrr pointed out in a comment on another answer probably the best answer is to re-require the package with the same version constraint.
ie.
composer require vendor/package
or specifying a version constraint
composer require vendor/package:^1.0.0
a simple line , after that you can see also a doted line
import java.awt.*;
import javax.swing.*;
import java.awt.Graphics.*;
import java.awt.Graphics2D.*;
import javax.swing.JFrame;
import javax.swing.JPanel;
import java.awt.BasicStroke;
import java.awt.Event.*;
import java.awt.Component.*;
import javax.swing.SwingUtilities;
/**
*
* @author junaid
*/
public class JunaidLine extends JPanel{
//private Graphics Graphics;
private void doDrawing(Graphics g){
Graphics2D g2d=(Graphics2D) g;
float[] dash1 = {2f,0f,2f};
g2d.drawLine(20, 40, 250, 40);
BasicStroke bs1 = new BasicStroke(1,BasicStroke.CAP_BUTT,
BasicStroke.JOIN_ROUND,1.0f,dash1,2f);
g2d.setStroke(bs1);
g2d.drawLine(20, 80, 250, 80);
}
@Override
public void paintComponent(Graphics g){
super.paintComponent( g);
doDrawing(g);
}
}
class BasicStrokes extends JFrame{
public BasicStrokes(){
initUI();
}
private void initUI(){
setTitle("line");
setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
add(new JunaidLine());
setSize(280,270);
setLocationRelativeTo(null);
}
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable(){
@Override
public void run(){
BasicStrokes bs = new BasicStrokes();
bs.setVisible(true);
}
});
}
}
As mentioned in previous answers, both serve almost same purpose. Personally I like git rebase and merge request (as in gitlab). It takes burden off of the reviewer/maintainer, making sure that while adding merge request, the feature branch includes all of the latest commits done on main branch after feature branch is created. Here is a very useful article explaining rebase in detail: https://git-scm.com/book/en/v2/Git-Branching-Rebasing
For me it depends on the component. If you know what you need it to be populated with then you should try to specify exclusively, or multiple types using:
PropTypes.oneOfType
If you want to refer to a React component then you will be looking for
PropTypes.element
Although,
PropTypes.node
describes anything that can be rendered - strings, numbers, elements or an array of these things. If this suits you then this is the way.
With very generic components, who can have many types of children, you can also use the below - though bare in mind that eslint and ts may not be happy with this lack of specificity:
PropTypes.any
UPDATE: this is a bug in spring see here
the application properties outside of your jar must be in one of the following places, then everything should work.
21.2 Application property files
SpringApplication will load properties from application.properties files in the following locations and add them to the Spring Environment:
A /config subdir of the current directory.
The current directory
A classpath /config package
The classpath root
so e.g. this should work, when you dont want to specify cmd line args and you dont use spring.config.location in your base app.props:
d:\yourExecutable.jar
d:\application.properties
or
d:\yourExecutable.jar
d:\config\application.properties
see spring external config doc
Update: you may use \@Configuration together with \@PropertySource. according to the doc here you can specify resources anywhere. you should just be careful, when which config is loaded to make sure your production one wins.
About the Implicit Objects of the Unified Expression Language, the Java EE 5 Tutorial writes:
Implicit Objects
The JSP expression language defines a set of implicit objects:
pageContext
: The context for the JSP page. Provides access to various objects including:
servletContext
: The context for the JSP page’s servlet and any web components contained in the same application. See Accessing the Web Context.session
: The session object for the client. See Maintaining Client State.request
: The request triggering the execution of the JSP page. See Getting Information from Requests.response
: The response returned by the JSP page. See Constructing Responses.- In addition, several implicit objects are available that allow easy access to the following objects:
param
: Maps a request parameter name to a single valueparamValues
: Maps a request parameter name to an array of valuesheader
: Maps a request header name to a single valueheaderValues
: Maps a request header name to an array of valuescookie
: Maps a cookie name to a single cookieinitParam
: Maps a context initialization parameter name to a single value- Finally, there are objects that allow access to the various scoped variables described in Using Scope Objects.
pageScope
: Maps page-scoped variable names to their valuesrequestScope
: Maps request-scoped variable names to their valuessessionScope
: Maps session-scoped variable names to their valuesapplicationScope
: Maps application-scoped variable names to their values
The interesting parts are in bold :)
So, to answer your question, you should be able to access it like this (using EL):
${param.accountID}
Or, using JSP Scriptlets (not recommended):
<%
String accountId = request.getParameter("accountID");
%>
You can use .change
for what you want
$("input[@name='lom']").change(function(){
// Do something interesting here
});
as of jQuery 1.3
you no longer need the '@'. Correct way to select is:
$("input[name='lom']")
These are escape characters which are used to manipulate string.
\t Insert a tab in the text at this point.
\b Insert a backspace in the text at this point.
\n Insert a newline in the text at this point.
\r Insert a carriage return in the text at this point.
\f Insert a form feed in the text at this point.
\' Insert a single quote character in the text at this point.
\" Insert a double quote character in the text at this point.
\\ Insert a backslash character in the text at this point.
Read more about them from here.
http://docs.oracle.com/javase/tutorial/java/data/characters.html
Putting the include /etc/nginx/mime.types;
under location / {
instead of under http {
solved the issue for me.
An old question, I know, however, none of the answers here really do a good job of simply answer the question.
I just played around with php and the solution looks like this:
function myFunction($requiredArgument, $optionalArgument = "default"){
echo $requiredArgument . $optionalArgument;
}
This function can do two things:
If its called with only the required parameter: myFunction("Hi")
It will print "Hi default"
But if it is called with the optional parameter: myFunction("Hi","me")
It will print "Hi me";
I hope this helps anyone who is looking for this down the road.
Usually used for embedding custom data, like pictures or sound data within an XML document.
As others have said, you are likely reading past the end of the file as you're only checking for x != ' '
. Instead you also have to check for EOF in the inner loop (but in this case don't use a char, but a sufficiently large type):
while ( ! file.eof() )
{
std::ifstream::int_type x = file.get();
while ( x != ' ' && x != std::ifstream::traits_type::eof() )
{
word += static_cast<char>(x);
x = file.get();
}
std::cout << word << '\n';
word.clear();
}
But then again, you can just employ the stream's streaming operators, which already separate at whitespace (and better account for multiple spaces and other kinds of whitepsace):
void readFile( )
{
std::ifstream file("program.txt");
for(std::string word; file >> word; )
std::cout << word << '\n';
}
And even further, you can employ a standard algorithm to get rid of the manual loop altogether:
#include <algorithm>
#include <iterator>
void readFile( )
{
std::ifstream file("program.txt");
std::copy(std::istream_iterator<std::string>(file),
std::istream_itetator<std::string>(),
std::ostream_iterator<std::string>(std::cout, "\n"));
}
I think this will be simple and fast -
var scrollWidth= window.innerWidth-$(document).width()
You can do it in a less than a minute with Google Drive (and free, no hassles)
• Bulk Upload all your images on imgur.com
• Copy the Links of all the images together, appended with .jpg. Only imgur lets you do copy all the image links together, do that using the image tab top right.
• Use http://TextMechanic.co to prepend and append each line with this:
Prefix : =image("
AND
Suffix : ", 1)
So that it looks like this =image("URL", 1)
• Copy All
• Paste it in Google Spreadsheet
• Voila!
References :
http://www.labnol.org/internet/images-in-google-spreadsheet/18167/
https://support.google.com/drive/bin/answer.py?hl=en&answer=87037&from=1068225&rd=1
To change the title for each different activity
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_pizza);
setTitle(getResources().getText(R.string.title));
}
You can do that in this way:
ORDER BY `products`.`product_category_id` DESC ,`naam` ASC
Have a look at ORDER BY
Optimization
#include<stdio.h>
#include<string.h>
int main()
{
char s1[50],s2[50];
printf("Enter the character of strings: ");
gets(s1);
printf("\nEnter different character of string to repeat: \n");
while(strcmp(s1,s2))
{
printf("%s\n",s1);
gets(s2);
}
return 0;
}
This is very simple solution in which you will get your output as you want.
@tasseKATT's Answer is great, but if you don't want to make a directive, why not use $document
?
.controller('ExampleController', ['$scope', '$document', function($scope, $document) {
var dumb = function (id) {
var queryResult = $document[0].getElementById(id)
var wrappedID = angular.element(queryResult);
return wrappedID;
};
You can create multiple workspaces in Eclipse. You have to just specify the path of the workspace during Eclipse startup. You can even switch workspaces via File?Switch workspace.
You can then import project to your workspace, copy paste project to your new workspace folder, then
File?Import?Existing project in to workspace?select project.
This thread (dead now) contains really wonderful stuff. But I'm not able to do it right on this page using FF 3.5b99 + FireBug due to "Security Error".
Yipee!! I was able to select whole right hand sidebar with this code hope it helps you:
var r = document.createRange();
var w=document.getElementById("sidebar");
r.selectNodeContents(w);
var sel=window.getSelection();
sel.removeAllRanges();
sel.addRange(r);
PS:- I was not able to use objects returned by jquery selectors like
var w=$("div.welovestackoverflow",$("div.sidebar"));
//this throws **security exception**
r.selectNodeContents(w);
I was having the same exception with node v12.13.1,
Downgraded node to v10.15.3 and it works fine now.
you could use key
value to reset state when need, pass props to state it's not a good practice , because you have uncontrolled and controlled component in one place. Data should be in one place handled
read this
https://reactjs.org/blog/2018/06/07/you-probably-dont-need-derived-state.html#recommendation-fully-uncontrolled-component-with-a-key
If this is a simple Java project, You essentially create a new project and give the location of the existing code. The project wizard will tell you that it will use existing sources.
Also, Eclipse 3.3.2 is ancient history, you guys should really upgrade. This is like using Visual Studio 5.
The httpd dæmon on OpenBSD uses the following stylesheet for all of its error messages, which presumably covers all the Comic Sans variations on non-Windows systems:
http://openbsd.su/src/usr.sbin/httpd/server_http.c#server_abort_http
810 style = "body { background-color: white; color: black; font-family: "
811 "'Comic Sans MS', 'Chalkboard SE', 'Comic Neue', sans-serif; }\n"
812 "hr { border: 0; border-bottom: 1px dashed; }\n";
E.g., try this:
font-family: 'Comic Sans MS', 'Chalkboard SE', 'Comic Neue', sans-serif;
We had this exact problem with fontawesome-webfont.woff2 throwing a 406 error on a shared host (Cpanel). I was working on the elusive "cookie-less domain" for a Wordpress Multisite project and my "www.domain.tld" pages would have the following error (3 times) in Chrome:
Font from origin 'http://static.domain.tld' has been blocked from loading by Cross-Origin Resource Sharing policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://www.domain.tld' is therefore not allowed access.
and in Firefox, a little more detail:
downloadable font: download failed (font-family: "FontAwesome" style:normal weight:normal stretch:normal src index:1): bad URI or cross-site access not allowed source: http://static.domain.tld/wp-content/themes/some-theme-here/fonts/fontawesome-webfont.woff2?v=4.7.0
font-awesome.min.css:4:14 Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at http://static.domain.tld/wp-content/themes/some-theme-here/fonts/fontawesome-webfont.woff?v=4.7.0. (Reason: CORS header ‘Access-Control-Allow-Origin’ missing).
I got to QWANT-ing around (QWANT.com = fantastic) and found this SO post:
Access-Control-Allow-Origin wildcard subdomains, ports and protocols
An hour in chat with different Shared Host support staff (one didn't even know about F12 in a browser...) then waiting for a response to the ticket that got cut after no joy while playing with mod_security. I tried to cobble the code for the .htaccess file together from the post in the meantime, and got this to work to remedy the 406 errors, flawlessly:
<IfModule mod_headers.c>
<IfModule mod_rewrite.c>
SetEnvIf Origin "http(s)?://(.+\.)?domain\.tld(:\d{1,5})?$" CORS=$0
Header set Access-Control-Allow-Origin "%{CORS}e" env=CORS
Header merge Vary "Origin"
</IfModule>
</IfModule>
I added that to the top of my .htaccess at the site root and now I have a new Uncle named Bob. (***of course change the domain.tld parts to whatever your domain that you are working with is...)
My FAVORITE part of this post though is the ability to RegEx OR (|) multiple sites into this CORS "hack" by doing:
To allow Multiple sites:
SetEnvIf Origin "http(s)?://(.+\.)?(othersite\.com|mywebsite\.com)(:\d{1,5})?$" CORS=$0
This fix honestly kind of blew my mind because I've ran into this issue before, working with Dev's at Fortune 500 companies that are MILES above my knowledgebase of Apache and couldn't solve problems like this without getting IT to tweak on Apache settings.
This is kind of the magic bullet to fix all those CDN issues with cookie-less (or near cookie-less if you use CloudFlare...) domains to reduce the amount of unnecessary web traffic from cookies that get sent with every image request only to be ditched like a bad blind date by the server.
Super Secure, Super Elegant. Love it: You don't have to open up your servers bandwidth to resource thieves / hot-link-er types.
Props to a collective effort from these 3 brilliant minds for solving what was once thought to unsolvable with .htaccess, whom I pieced this code together from:
@Noyo https://stackoverflow.com/users/357774/noyo
@DaveRandom https://stackoverflow.com/users/889949/daverandom
@pratap-koritala https://stackoverflow.com/users/4401569/pratap-koritala
<form action="product.php" method="post" name="frmProduct" id="frmProduct" enctype="multipart/form-data">
<input id="submit_value" type="button" name="submit_value" value="">
</form>
<script type="text/javascript">
document.getElementById("submit_value").onclick = submitAction;
function submitAction()
{
document.getElementById("frmProduct").submit();
return false;
}
</script>
EDIT: I accidentally swapped the id's around
In the html tables, <table>
tag expect <tr>
tag right after itself and <tr>
tag expect <td>
tag right after itself. So if you want to put a div in table, you can put it in between <td>
and </td>
tags as data.
<table>_x000D_
<tr>_x000D_
<td>_x000D_
<div>_x000D_
<p>It works well</p>_x000D_
</div>_x000D_
</td>_x000D_
</tr>_x000D_
<table>
_x000D_
The default display
property for a table is display:table;
. The only other useful value is inline-table
. All other display
values are invalid for table elements.
There isn't an auto
option to reset it to default, although if you're working in Javascript, you can set it to an empty string, which will do the trick.
width:auto;
is valid, but isn't the default. The default width for a table is 100%
, whereas width:auto;
will make the element only take up as much width as it needs to.
min-width:auto;
isn't allowed. If you set min-width
, it must have a value, but setting it to zero is probably as good as resetting it to default.
The official naming conventions aren't that strict, they don't even 'forbid' camel case notation except for prefix (com
in your example).
But I personally would avoid upper case letters and hyphenations, even numbers. I'd choose com.stackoverflow.mypackage
like Bragboy suggested too.
(hyphenations '-' are not legal in package names)
EDIT
Interesting - the language specification has something to say about naming conventions too.
In Chapter 7.7 Unique Package Names we see examples with package names that consist of upper case letters (so CamelCase notation would be OK) and they suggest to replace hyphonation by an underscore ("mary-lou" -> "mary_lou") and prefix java keywords with an underscore ("com.example.enum" -> "com.example._enum")
Some more examples for upper case letters in package names can be found in chapter 6.8.1 Package Names.
Netstat:
-o owning process
netstat -bano | findstr "7002"
netstat -ano > ano.txt
The Currports tool helps to search and filter
This is your code:
<?php
define("DB_HOST", "localhost");
define("DB_USER", "root");
define("DB_PASSWORD", "");
define("DB_DATABASE", "databasename");
$db = mysqli_connect(DB_SERVER, DB_USERNAME, DB_PASSWORD, DB_DATABASE);
?>
The only error that causes this message is that:
DB_USER
but you're calling after as DB_USERNAME
.Please be more careful next time.
It is better for an entry-level programmer that wants to start coding in PHP
not to use what he or she does not know very well.
ONLY as advice, please try to use (for the first time) code more ubiquitous.
ex: do not use the define()
statement, try to use variables declaration as $db_user = 'root';
Have a nice experience :)
The task never specified that the program must terminate after 1000.
void f(int n){
printf("%d\n",n);
f(n+1);
}
int main(){
f(1);
}
(Can be shortened to this if you run ./a.out with no extra params)
void main(int n) {
printf("%d\n", n);
main(n+1);
}
If adding google()
into your build.gradle
doesn't work try adding it at first place in your repositories section of node_modules/YOUR_PACKAGE/android/build.gradle
file.
Create a css and set the value style="width:50px;"
in css code. Call the class of CSS in the drop down list. Then it will work.
Handy if you are already in the directory you want to add to PATH:
set PATH=%PATH%;%CD%
It works with the standard Windows cmd, but not in PowerShell.
For PowerShell, the %CD%
equivalent is [System.Environment]::CurrentDirectory
.
To avoid problems of side effects after changing env
, especially using multiple nodes, it is better to set a temporary context.
One safe way to alter the environment is:
withEnv(['MYTOOL_HOME=/usr/local/mytool']) {
sh '$MYTOOL_HOME/bin/start'
}
This approach does not poison the env after the command execution.
You could consider using the es6 import export syntax. In file 1;
export function f1() {...}
And then in file 2;
import { f1 } from "./file1.js";
f1();
Please note that this only works if you're using <script src="./file2.js" type="module">
You will not need two script tags if you do it this way. You simply need the main script, and you can import all your other stuff there.
Double check if you are not able to use keys.
Otherwise use expect:
#!/usr/bin/expect -f
spawn ssh [email protected]
expect "assword:"
send "mypassword\r"
interact
The reason for this is that I am printing these out to a document and I want to use the key name and the value in doing this
Based on the above requirement this is what I would suggest:
keys = mydictionary.keys()
keys.sort()
for each in keys:
print "%s: %s" % (each, mydictionary.get(each))
You can trigger a newline by inserting Chunk.NEWLINE
into your document. Here's an example.
public static void main(String args[]) {
try {
// create a new document
Document document = new Document( PageSize.A4, 20, 20, 20, 20 );
PdfWriter.getInstance( document, new FileOutputStream( "HelloWorld.pdf" ) );
document.open();
document.add( new Paragraph( "Hello, World!" ) );
document.add( new Paragraph( "Hello, World!" ) );
// add a couple of blank lines
document.add( Chunk.NEWLINE );
document.add( Chunk.NEWLINE );
// add one more line with text
document.add( new Paragraph( "Hello, World!" ) );
document.close();
}
catch (Exception e) {
e.printStackTrace();
}
}
Below is a screen shot showing part of the PDF that the code above produces.
Playing with the tsconfig.json You can also targeting es5 like this :
{
"compilerOptions": {
"experimentalDecorators": true,
"module": "commonjs",
"target": "es5"
}
...
An activity populates the ActionBar in its onCreateOptionsMenu()
method.
Instead of using setcustomview()
, just override onCreateOptionsMenu
like this:
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.mainmenu, menu);
return true;
}
If an actions in the ActionBar is selected, the onOptionsItemSelected()
method is called. It receives the selected action as parameter. Based on this information you code can decide what to do for example:
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.menuitem1:
Toast.makeText(this, "Menu Item 1 selected", Toast.LENGTH_SHORT).show();
break;
case R.id.menuitem2:
Toast.makeText(this, "Menu item 2 selected", Toast.LENGTH_SHORT).show();
break;
}
return true;
}
I was also having syntax error: unexpected token <
while posting a form via ajax. Then I used curl to see what it returns:
curl -X POST --data "firstName=a&lastName=a&[email protected]&pass=aaaa&mobile=12345678901&nID=123456789123456789&age=22&prof=xfd" http://handymama.co/CustomerRegistration.php
I got something like this as a response:
<br />
<b>Warning</b>: Cannot modify header information - headers already sent by (output started at /home/handymama/public_html/CustomerRegistration.php:1) in <b>/home/handymama/public_html/CustomerRegistration.php</b> on line <b>3</b><br />
<br />
<b>Warning</b>: Cannot modify header information - headers already sent by (output started at /home/handymama/public_html/CustomerRegistration.php:1) in <b>/home/handymama/public_html/CustomerRegistration.php</b> on line <b>4</b><br />
<br />
<b>Warning</b>: Cannot modify header information - headers already sent by (output started at /home/handymama/public_html/CustomerRegistration.php:1) in <b>/home/handymama/public_html/CustomerRegistration.php</b> on line <b>7</b><br />
<br />
<b>Warning</b>: Cannot modify header information - headers already sent by (output started at /home/handymama/public_html/CustomerRegistration.php:1) in <b>/home/handymama/public_html/CustomerRegistration.php</b> on line <b>8</b><br />
So all I had to do is just change the log level to only errors rather than warning.
error_reporting(E_ERROR);
Short ES6 way with Airbnb code style
Exemple:
const obj = arr.reduce((prevObj, [key, value]) => ({ ...prevObj, [key]: value }), {});
Set libraries search path first:
LINK_DIRECTORIES(${CMAKE_BINARY_DIR}/res)
And then just do
TARGET_LINK_LIBRARIES(GLBall mylib)
If you want to delete any commit then you might need to use git rebase command
git rebase -i HEAD~2
it will show you last 2 commit messages, if you delete the commit message and save that file deleted commit will automatically disappear...
List<WebElement>itemNames = wd.findElements(By.cssSelector("a strong"));
System.out.println("No items in Catalog page: " + itemNames.size());
for (WebElement itemName:itemNames)
{
System.out.println(itemName.getText());
}
just look at cv2.randu() or cv.randn(), it's all pretty similar to matlab already, i guess.
let's play a bit ;) :
import cv2
import numpy as np
>>> im = np.empty((5,5), np.uint8) # needs preallocated input image
>>> im
array([[248, 168, 58, 2, 1], # uninitialized memory counts as random, too ? fun ;)
[ 0, 100, 2, 0, 101],
[ 0, 0, 106, 2, 0],
[131, 2, 0, 90, 3],
[ 0, 100, 1, 0, 83]], dtype=uint8)
>>> im = np.zeros((5,5), np.uint8) # seriously now.
>>> im
array([[0, 0, 0, 0, 0],
[0, 0, 0, 0, 0],
[0, 0, 0, 0, 0],
[0, 0, 0, 0, 0],
[0, 0, 0, 0, 0]], dtype=uint8)
>>> cv2.randn(im,(0),(99)) # normal
array([[ 0, 76, 0, 129, 0],
[ 0, 0, 0, 188, 27],
[ 0, 152, 0, 0, 0],
[ 0, 0, 134, 79, 0],
[ 0, 181, 36, 128, 0]], dtype=uint8)
>>> cv2.randu(im,(0),(99)) # uniform
array([[19, 53, 2, 86, 82],
[86, 73, 40, 64, 78],
[34, 20, 62, 80, 7],
[24, 92, 37, 60, 72],
[40, 12, 27, 33, 18]], dtype=uint8)
to apply it to an existing image, just generate noise in the desired range, and add it:
img = ...
noise = ...
image = img + noise
Ronal, to answer your question in the comment in my answer above:
function wasClicked(str)
{
return str+' def';
}
You should use CREATE TABLE AS SELECT (CTAS) statement to create a directory in HDFS with the files containing the results of the query. After that you will have to export those files from HDFS to your regular disk and merge them into a single file.
You also might have to do some trickery to convert the files from '\001' - delimited to CSV. You could use a custom CSV SerDe or postprocess the extracted file.
Try using "w+"
as the write mode instead of just "w"
:
File.open("out.txt", "w+") { |file| file.write("boo!") }
In your onEditorAction handler, keep in mind that you must return a boolean that indicates if you are handling the action (true) or if you applied some logic and want the normal behaviour (false), as in the following example:
EditText te = ...
te.setOnEditorActionListener(new OnEditorActionListener() {
@Override
public boolean onEditorAction(TextView v, int actionId, KeyEvent event){
if (actionId == EditorInfo.IME_ACTION_NEXT) {
// Some logic here.
return true; // Focus will do whatever you put in the logic.
}
return false; // Focus will change according to the actionId
}
});
I found this when I returned true after performing my logic since focus did not move.
You can check out my PowerfulExtensions library. Currently it's in a very young stage, but already you can use methods like Distinct, Union, Intersect, Except on any number of properties;
This is how you use it:
using PowerfulExtensions.Linq;
...
var distinct = myArray.Distinct(x => x.A, x => x.B);
To add to the accepted answer, I had a similar issue and solved it using a similar approach with the contrived example below. In this case I needed to log some parameters on componentWillUnmount
and as described in the original question I didn't want it to log every time the params changed.
const componentWillUnmount = useRef(false)
// This is componentWillUnmount
useEffect(() => {
return () => {
componentWillUnmount.current = true
}
}, [])
useEffect(() => {
return () => {
// This line only evaluates to true after the componentWillUnmount happens
if (componentWillUnmount.current) {
console.log(params)
}
}
}, [params]) // This dependency guarantees that when the componentWillUnmount fires it will log the latest params
There are also these 'ways':
>>> dict.fromkeys(range(1, 4))
{1: None, 2: None, 3: None}
>>> dict(zip(range(1, 4), range(1, 4)))
{1: 1, 2: 2, 3: 3}
There's one in an old version of the Python docs with itertools
examples:
from itertools import islice
def window(seq, n=2):
"Returns a sliding window (of width n) over data from the iterable"
" s -> (s0,s1,...s[n-1]), (s1,s2,...,sn), ... "
it = iter(seq)
result = tuple(islice(it, n))
if len(result) == n:
yield result
for elem in it:
result = result[1:] + (elem,)
yield result
The one from the docs is a little more succinct and uses itertools
to greater effect I imagine.
I also wouldn't call two many (is_a?
and kind_of?
are aliases of the same method), but if you want to see more possibilities, turn your attention to #class
method:
A = Class.new
B = Class.new A
a, b = A.new, B.new
b.class < A # true - means that b.class is a subclass of A
a.class < B # false - means that a.class is not a subclass of A
# Another possibility: Use #ancestors
b.class.ancestors.include? A # true - means that b.class has A among its ancestors
a.class.ancestors.include? B # false - means that B is not an ancestor of a.class
In your string file use this
<string name="redeem_point"> You currently have %s points(%s points = 1 %s)</string>
And in your code use as accordingly
coinsTextTV.setText(String.format(getContext().getString(R.string.redeem_point), rewardPoints.getReward_points()
, rewardPoints.getConversion_rate(), getString(R.string.rs)));
You can set your activity to use a specific volume. In your activity, use one of the following:
this.setVolumeControlStream(AudioManager.STREAM_MUSIC);
this.setVolumeControlStream(AudioManager.STREAM_RING);
this.setVolumeControlStream(AudioManager.STREAM_ALARM);
this.setVolumeControlStream(AudioManager.STREAM_NOTIFICATION);
this.setVolumeControlStream(AudioManager.STREAM_SYSTEM);
this.setVolumeControlStream(AudioManager.STREAM_VOICECALL);
Following works in Java 8..
List<String[]> addresses = new ArrayList<>();
Here is a filter that will take a date string OR javascript Date() object. It uses Moment.js and can apply any Moment.js transform function, such as the popular 'fromNow'
angular.module('myModule').filter('moment', function () {
return function (input, momentFn /*, param1, param2, ...param n */) {
var args = Array.prototype.slice.call(arguments, 2),
momentObj = moment(input);
return momentObj[momentFn].apply(momentObj, args);
};
});
So...
{{ anyDateObjectOrString | moment: 'format': 'MMM DD, YYYY' }}
would display Nov 11, 2014
{{ anyDateObjectOrString | moment: 'fromNow' }}
would display 10 minutes ago
If you need to call multiple moment functions, you can chain them. This converts to UTC and then formats...
{{ someDate | moment: 'utc' | moment: 'format': 'MMM DD, YYYY' }}
In Designer, activate the centralWidget and assign a layout, e.g. horizontal or vertical layout. Then your QFormLayout will automatically resize.
Always make sure, that all widgets have a layout! Otherwise, automatic resizing will break with that widget!
Controls insist on being too large, and won't resize, in QtDesigner
select this_.code from true.employee this_ where this_.code=?
is what will be sent to your database.
this_
is an alias for that instance of the employee
table.
I solved my z-index
problem by making the body wrapper z-index:-1
and the body z-index:-2
, and the other divs z-index:1
.
And then the later divs didn't work unless I had z-index
200+. Even though I had position:relative
on each element, with the body at default z-index
it wouldn't work.
Hope this helps somebody.
Ah yes. Welcome to Asynchronous execution.
Basically, pausing a script would cause the browser and page to become unresponsive for 3 seconds. This is horrible for web apps, and so isn't supported.
Instead, you have to think "event-based". Use setTimeout to call a function after a certain amount of time, which will continue to run the JavaScript on the page during that time.
Update: note that the currently accepted answer perpetuates a common misunderstanding about the behaviour of git push
, which hasn't been corrected despite a comment pointing it out.
Your summary of what remotes are - like a nickname for the URL of a repository - is correct.
So why does the URL not git://[email protected]/peter/first_app.git but in the other syntax -- what syntax is it? Why must it end with .git? I tried not using .git at the end and it works too. If not .git, what else can it be? The git at the beginner seems to be a user account on the git server?
The two URLs that you've mentioned indicate that two different transport protocols should be used. The one beginning with git://
is for the git protocol, which is usually only used for read-only access to repositories. The other one, [email protected]:peter/first_app.git
, is one of the different ways of specifying access to a repository over SSH - this is the "scp-style syntax" described in the documentation. That the username in the scp-style syntax is git
is because of the way that GitHub deals with identifying users - essentially that username is ignored, and the user is identified based on the SSH key-pair that they used to authenticate.
As for the verbosity of git push origin master
, you've noticed that after the first push, you can then just do git push
. This is because of a series of difficult-to-remember-but-generally-helpful defaults :)
remote.master.url
in your case) is used. If that's not set up, then origin
is used.master
, master:my-experiment
, etc.) specified, then git defaults to pushing every local branch that has the same name as a branch on the remote. If you just have a branch called master
in common between your repository and the remote one, that'll be the same as pushing your master
to the remote master
.Personally, since I tend to have many topic branches (and often several remotes) I always use the form:
git push origin master
... to avoid accidentally pushing other branches.
In reply to your comments on one of the other answers, it sounds to me as if are learning about git in a top-down way very effectively - you've discovered that the defaults work, and your question is asking about why ;) To be more serious, git can be used essentially as simply as SVN, but knowing a bit about remotes and branches means you can use it much more flexibily and this can really change the way you work for the better. Your remark about a semester course makes me think of something Scott Chacon said in a podcast interview - students are taught about all kinds of basic tools in computer science and software engineering, but very rarely version control. Distributed version control systems such as git and Mercurial are now so important, and so flexible, that it would be worth teaching courses on them to give people a good grounding.
My view is that with git
, this learning curve is absolutely worth it - working with lots of topic branches, merging them easily, and pushing and pulling them about between different repositories is fantastically useful once you become confident with the system. It's just unfortunate that:
A very simple way to read an external script into an sqlite database in python is using executescript()
:
import sqlite3
conn = sqlite3.connect('csc455_HW3.db')
with open('ZooDatabase.sql', 'r') as sql_file:
conn.executescript(sql_file.read())
conn.close()
Using the HttpClientBuilder
in HttpClient 4.5.x with a custom HttpClientConnectionManager
with the defaults of HttpClientBuilder
:
SSLConnectionSocketFactory sslConnectionSocketFactory =
new SSLConnectionSocketFactory(SSLContexts.createDefault(),
new String[] { "TLSv1.2" },
null,
SSLConnectionSocketFactory.getDefaultHostnameVerifier());
PoolingHttpClientConnectionManager poolingHttpClientConnectionManager =
new PoolingHttpClientConnectionManager(
RegistryBuilder.<ConnectionSocketFactory> create()
.register("http",
PlainConnectionSocketFactory.getSocketFactory())
.register("https",
sslConnectionSocketFactory)
.build());
// Customize the connection pool
CloseableHttpClient httpClient = HttpClientBuilder.create()
.setConnectionManager(poolingHttpClientConnectionManager)
.build()
Without a custom HttpClientConnectionManager
:
SSLConnectionSocketFactory sslConnectionSocketFactory =
new SSLConnectionSocketFactory(SSLContexts.createDefault(),
new String[] { "TLSv1.2" },
null,
SSLConnectionSocketFactory.getDefaultHostnameVerifier());
CloseableHttpClient httpClient = HttpClientBuilder.create()
.setSSLSocketFactory(sslConnectionSocketFactory)
.build()
Here is how I did this.
I see that in some answers they are setting app.UserCors("xxxPloicy")
and putting [EnableCors("xxxPloicy")]
in controllers. You do not need to do both.
Here are the steps.
In Startup.cs inside the ConfigureServices add the following code.
services.AddCors(c=>c.AddPolicy("xxxPolicy",builder => {
builder.AllowAnyOrigin()
.AllowAnyMethod()
.AllowAnyHeader();
}));
If you want to apply all over the project then add the following code in Configure method in Startup.cs
app.UseCors("xxxPolicy");
Or
If you want to add it to the specific controllers then add enable cors code as shown below.
[EnableCors("xxxPolicy")]
[Route("api/[controller]")]
[ApiController]
public class TutorialController : ControllerBase {}
For more info: see this
With jquery
$("div#id").append('<a href=#>Your LINK TITLE</a>')
With javascript
var new_a = document.createElement('a');
new_a.setAttribute("href", "link url here");
new_a.innerHTML = "your link text";
//add new link to the DOM
document.appendChild(new_a);
After looking at your method, I used this method to solve it.
class Register(forms.Form):
username = forms.CharField(label='???', max_length=32)
email = forms.EmailField(label='??', max_length=64)
password = forms.CharField(label="??", min_length=6, max_length=16)
captcha = forms.CharField(label="???", max_length=4)
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
for field_name in self.fields:
field = self.fields.get(field_name)
self.fields[field_name].widget.attrs.update({
"placeholder": field.label,
'class': "input-control"
})
I don't think there would be an automatic way. You might also want to add a page number to the appendix correctly. Assuming that you already have your pdf document of several pages, you'll have to extract each page first of your pdf document using Adobe Acrobat Professional for instance and save each of them as a separate pdf file. Then you'll have to include each of the the pdf documents as images on an each page basis (1 each page) and use newpage between each page e,g,
\appendix
\section{Quiz 1}\label{sec:Quiz}
\begin{figure}[htp] \centering{
\includegraphics[scale=0.82]{quizz.pdf}}
\caption{Experiment 1}
\end{figure}
\newpage
\section{Sample paper}\label{sec:Sample}
\begin{figure}[htp] \centering{
\includegraphics[scale=0.75]{sampaper.pdf}}
\caption{Experiment 2}
\end{figure}
Now each page will appear with 1 pdf image per page and you'll have a correct page number at the bottom. As shown in my example, you'll have to play a bit with the scale factor for each image to get it in the right size that will fit on a single page. Hope that helps...
These all look a bit more complicated than they need to be. My code is very simple and fast:
def fibonacci(x):
List = []
f = 1
List.append(f)
List.append(f) #because the fibonacci sequence has two 1's at first
while f<=x:
f = List[-1] + List[-2] #says that f = the sum of the last two f's in the series
List.append(f)
else:
List.remove(List[-1]) #because the code lists the fibonacci number one past x. Not necessary, but defines the code better
for i in range(0, len(List)):
print List[i] #prints it in series form instead of list form. Also not necessary
I believe you can diff against files in your index and untracked files by simply supplying the path to both files.
git diff --no-index tracked_file untracked_file
If you have a situation where you are using dynamic columns in your pivot statement you could use the following:
DECLARE @cols NVARCHAR(MAX)
DECLARE @colsWithNoNulls NVARCHAR(MAX)
DECLARE @query NVARCHAR(MAX)
SET @cols = STUFF((SELECT distinct ',' + QUOTENAME(Name)
FROM Hospital
WHERE Active = 1 AND StateId IS NOT NULL
FOR XML PATH(''), TYPE
).value('.', 'NVARCHAR(MAX)')
,1,1,'')
SET @colsWithNoNulls = STUFF(
(
SELECT distinct ',ISNULL(' + QUOTENAME(Name) + ', ''No'') ' + QUOTENAME(Name)
FROM Hospital
WHERE Active = 1 AND StateId IS NOT NULL
FOR XML PATH(''), TYPE
).value('.', 'NVARCHAR(MAX)')
,1,1,'')
EXEC ('
SELECT Clinician, ' + @colsWithNoNulls + '
FROM
(
SELECT DISTINCT p.FullName AS Clinician, h.Name, CASE WHEN phl.personhospitalloginid IS NOT NULL THEN ''Yes'' ELSE ''No'' END AS HasLogin
FROM Person p
INNER JOIN personlicense pl ON pl.personid = p.personid
INNER JOIN LicenseType lt on lt.licensetypeid = pl.licensetypeid
INNER JOIN licensetypegroup ltg ON ltg.licensetypegroupid = lt.licensetypegroupid
INNER JOIN Hospital h ON h.StateId = pl.StateId
LEFT JOIN PersonHospitalLogin phl ON phl.personid = p.personid AND phl.HospitalId = h.hospitalid
WHERE ltg.Name = ''RN'' AND
pl.licenseactivestatusid = 2 AND
h.Active = 1 AND
h.StateId IS NOT NULL
) AS Results
PIVOT
(
MAX(HasLogin)
FOR Name IN (' + @cols + ')
) p
')
Dont write with stability stable
in the command ,
in your composer.json file, put
"minimum-stability": "stable"
before the closing curly bracket.
With text files, maybe the EOF is -1 when using BufferReader.read(), char by char. I made a test with BufferReader.readLine()!=null and it worked properly.
Note this behavior when getting radio input values:
$('input[name="myRadio"]').change(function(e) { // Select the radio input group
// This returns the value of the checked radio button
// which triggered the event.
console.log( $(this).val() );
// but this will return the first radio button's value,
// regardless of checked state of the radio group.
console.log( $('input[name="myRadio"]').val() );
});
So $('input[name="myRadio"]').val()
does not return the checked value of the radio input, as you might expect -- it returns the first radio button's value.
I would suggest keeping a reference within the activity to the Menu object you receive in onCreateOptionsMenu and then using that to retrieve the MenuItem that requires the change as and when you need it. For example, you could do something along the lines of the following:
public class YourActivity extends Activity {
private Menu menu;
private String inBedMenuTitle = "Set to 'In bed'";
private String outOfBedMenuTitle = "Set to 'Out of bed'";
private boolean inBed = false;
@Override
public boolean onCreateOptionsMenu(Menu menu) {
super.onCreateOptionsMenu(menu);
// Create your menu...
this.menu = menu;
return true;
}
private void updateMenuTitles() {
MenuItem bedMenuItem = menu.findItem(R.id.bedSwitch);
if (inBed) {
bedMenuItem.setTitle(outOfBedMenuTitle);
} else {
bedMenuItem.setTitle(inBedMenuTitle);
}
}
}
Alternatively, you can override onPrepareOptionsMenu to update the menu items each time the menu is displayed.
You could also use the <figure>
element to link a heading to your list like this:
<figure>
<figcaption>My favorite fruits</figcaption>
<ul>
<li>Banana</li>
<li>Orange</li>
<li>Chocolate</li>
</ul>
</figure>
Source: https://www.w3.org/TR/2017/WD-html53-20171214/single-page.html#the-li-element (Example 162)
if you just want to check if one or the other element are present you can use this custom helper
Handlebars.registerHelper('if_or', function(elem1, elem2, options) {
if (Handlebars.Utils.isEmpty(elem1) && Handlebars.Utils.isEmpty(elem2)) {
return options.inverse(this);
} else {
return options.fn(this);
}
});
like this
{{#if_or elem1 elem2}}
{{elem1}} or {{elem2}} are present
{{else}}
not present
{{/if_or}}
if you also need to be able to have an "or" to compare function return values I would rather add another property that returns the desired result.
The templates should be logicless after all!
This is the PHP ternary operator (also known as a conditional operator) - if first operand evaluates true, evaluate as second operand, else evaluate as third operand.
Think of it as an "if" statement you can use in expressions. Can be very useful in making concise assignments that depend on some condition, e.g.
$param = isset($_GET['param']) ? $_GET['param'] : 'default';
There's also a shorthand version of this (in PHP 5.3 onwards). You can leave out the middle operand. The operator will evaluate as the first operand if it true, and the third operand otherwise. For example:
$result = $x ?: 'default';
It is worth mentioning that the above code when using i.e. $_GET or $_POST variable will throw undefined index notice and to prevent that we need to use a longer version, with isset
or a null coalescing operator which is introduced in PHP7:
$param = $_GET['param'] ?? 'default';
The answers already explain how attributes and properties are handled differently, but I really would like to point out how totally insane this is. Even if it is to some extent the spec.
It is crazy, to have some of the attributes (e.g. id, class, foo, bar) to retain only one kind of value in the DOM, while some attributes (e.g. checked, selected) to retain two values; that is, the value "when it was loaded" and the value of the "dynamic state". (Isn't the DOM supposed to be to represent the state of the document to its full extent?)
It is absolutely essential, that two input fields, e.g. a text and a checkbox behave the very same way. If the text input field does not retain a separate "when it was loaded" value and the "current, dynamic" value, why does the checkbox? If the checkbox does have two values for the checked attribute, why does it not have two for its class and id attributes? If you expect to change the value of a text *input* field, and you expect the DOM (i.e. the "serialized representation") to change, and reflect this change, why on earth would you not expect the same from an input field of type checkbox on the checked attribute?
The differentiation, of "it is a boolean attribute" just does not make any sense to me, or is, at least not a sufficient reason for this.
Just a fyi for people enabling mod_rewrite on Debian with Apache2:
To check whether mod_rewrite is enabled:
Look in mods_enabled for a link to the module by running
ls /etc/apache2/mods-enabled | grep rewrite
If this outputs rewrite.load
then the module is enabled. (Note: your path to apache2 may not be /etc/, though it's likely to be.)
To enable mod_rewrite if it's not already:
Enable the module (essentially creates the link we were looking for above):
a2enmod rewrite
Reload all apache config files:
service apache2 restart
See this:
history.pushState(null, null, location.href);
window.onpopstate = function () {
history.go(1);
};
it works fine...
Do NOT do that! setNum(num);//fix- until someone fixes your setter. Your getter should not call your setter with the uninitialized value of
num(e.g.
0`).
I suggest making a few small changes -
public static class Vars { private int num = 5; // Default to 5. public void setNum(int x) { this.num = x; // actually "set" the value. } public int getNum() { return num; } }
Without examples of the dataset of staging this is a shot in the dark, but have you tried something like this?
update PRODUCTION p,
staging s
set p.name = s.name
p.count = s.count
where p.id = s.id
This would work assuming the id column matches on both tables.
Include using namespace System.Linq
List<string> stringList = line.Split(',').ToList();
you can make use of it with ease for iterating through each item.
foreach(string str in stringList)
{
}
String.Split()
returns an array, hence convert it to a list using ToList()
The Zend Framework's Zend_Pdf is really good. It's on par with pdflib in terms of control of output and complexity and is more portable because its a pure php solution. That said, its slower and uses more memory than pdflib. Pecl modules are always more efficient than a php solution.
DOMPdf is the easiest way to make a pdf quickly. Like Mike said, feed it html and it outputs a pdf. Under the hood, it has the option to use either r&ospdf or pdflib as the rendering engine.
Placeholder cannot set the default value for text area. You can use
<textarea rows="10" cols="55" name="description"> /*Enter default value here to display content</textarea>
This is the tag if you are using it for database connection. You may use different syntax if you are using other languages than php.For php :
e.g.:
<textarea rows="10" cols="55" name="description" required><?php echo $description; ?></textarea>
required command minimizes efforts needed to check empty fields using php.
@ManyToMany
associationsMost often, you will need to use @JoinTable
annotation to specify the mapping of a many-to-many table relationship:
So, assuming you have the following database tables:
In the Post
entity, you would map this relationship, like this:
@ManyToMany(cascade = {
CascadeType.PERSIST,
CascadeType.MERGE
})
@JoinTable(
name = "post_tag",
joinColumns = @JoinColumn(name = "post_id"),
inverseJoinColumns = @JoinColumn(name = "tag_id")
)
private List<Tag> tags = new ArrayList<>();
The @JoinTable
annotation is used to specify the table name via the name
attribute, as well as the Foreign Key column that references the post
table (e.g., joinColumns
) and the Foreign Key column in the post_tag
link table that references the Tag
entity via the inverseJoinColumns
attribute.
Notice that the cascade attribute of the
@ManyToMany
annotation is set toPERSIST
andMERGE
only because cascadingREMOVE
is a bad idea since we the DELETE statement will be issued for the other parent record,tag
in our case, not to thepost_tag
record.
@OneToMany
associationsThe unidirectional @OneToMany
associations, that lack a @JoinColumn
mapping, behave like many-to-many table relationships, rather than one-to-many.
So, assuming you have the following entity mappings:
@Entity(name = "Post")
@Table(name = "post")
public class Post {
@Id
@GeneratedValue
private Long id;
private String title;
@OneToMany(
cascade = CascadeType.ALL,
orphanRemoval = true
)
private List<PostComment> comments = new ArrayList<>();
//Constructors, getters and setters removed for brevity
}
@Entity(name = "PostComment")
@Table(name = "post_comment")
public class PostComment {
@Id
@GeneratedValue
private Long id;
private String review;
//Constructors, getters and setters removed for brevity
}
Hibernate will assume the following database schema for the above entity mapping:
As already explained, the unidirectional @OneToMany
JPA mapping behaves like a many-to-many association.
To customize the link table, you can also use the @JoinTable
annotation:
@OneToMany(
cascade = CascadeType.ALL,
orphanRemoval = true
)
@JoinTable(
name = "post_comment_ref",
joinColumns = @JoinColumn(name = "post_id"),
inverseJoinColumns = @JoinColumn(name = "post_comment_id")
)
private List<PostComment> comments = new ArrayList<>();
And now, the link table is going to be called post_comment_ref
and the Foreign Key columns will be post_id
, for the post
table, and post_comment_id
, for the post_comment
table.
Unidirectional
@OneToMany
associations are not efficient, so you are better off using bidirectional@OneToMany
associations or just the@ManyToOne
side.
The point is semantics. In assertTrue, you are asserting that the expression is true. If it is not, then it will display the message and the assertion will fail. In assertFalse, you are asserting that an expression evaluates to false. If it is not, then the message is displayed and the assertion fails.
assertTrue (message, value == false) == assertFalse (message, value);
These are functionally the same, but if you are expecting a value to be false then use assertFalse
. If you are expecting a value to be true, then use assertTrue
.
If you're using Entity Framework < v6.0, then use EntityFunctions.TruncateTime
If you're using Entity Framework >= v6.0, then use DbFunctions.TruncateTime
Use either (based on your EF version) around any DateTime
class property you want to use inside your Linq query
Example
var list = db.Cars.Where(c=> DbFunctions.TruncateTime(c.CreatedDate)
>= DbFunctions.TruncateTime(DateTime.UtcNow));
Google is using this to detect whether the device is online or in captive portal.
Shill, the connection manager for Chromium OS, attempts to detect services that are within a captive portal whenever a service transitions to the ready state. This determination of being in a captive portal or being online is done by attempting to retrieve the webpage http://clients3.google.com/generate_204. This well known URL is known to return an empty page with an HTTP status 204. If for any reason the web page is not returned, or an HTTP response other than 204 is received, then shill marks the service as being in the portal state.
Here is the relevant explanation from the Google Chrome Privacy Whitepaper:
In the event that Chrome detects SSL connection timeouts, certificate errors, or other network issues that might be caused by a captive portal (a hotel's WiFi network, for instance), Chrome will make a cookieless request to http://www.gstatic.com/generate_204 and check the response code. If that request is redirected, Chrome will open the redirect target in a new tab on the assumption that it's a login page. Requests to the captive portal detection page are not logged.
More info: http://www.chromium.org/chromium-os/chromiumos-design-docs/network-portal-detection
Range("A1").value = Environ("Username")
This is better than Application.Username
, which doesn't always supply the Windows username. Thanks to Kyle for pointing this out.
Application Username
is the name of the User set in Excel > Tools > Options Environ("Username")
is the name you registered for Windows; see Control Panel >SystemProbably the easiest to hide a div and show a div in PHP based on a variables and the operator.
<?php
$query3 = mysql_query($query3);
$numrows = mysql_num_rows($query3);
?>
<html>
<?php if($numrows > null){ ?>
no meow :-(
<?php } ?>
<?php if($numrows < null){ ?>
lots of meow
<?php } ?>
</html>
Here is my original code before adding your requirements:
<?php
$address = 'meow';
?>
<?php if($address == null){ ?>
no meow :-(
<?php } ?>
<?php if($address != null){ ?>
lots of meow
<?php } ?>
I was able to solve the same issue by setting the timezone in my linux system (Centos6.5).
Reposting from
http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/set-time.html
set timezone in /etc/sysconfig/clock
e.g. set to ZONE="America/Los_Angeles"
sudo ln -sf /usr/share/zoneinfo/America/Phoenix /etc/localtime
To figure out the timezone value try to
ls /usr/share/zoneinfo
and look for the file that represents your timezone.
Once you've set these reboot the machine and try again.
To improve James' excellent answer:
It's better to put BINARY
in front of the constant instead:
SELECT * FROM `table` WHERE `column` = BINARY 'value'
Putting BINARY
in front of column
will prevent the use of any index on that column.
i'll leave this here since i will need to use it later. It's a source for a small binary compatible tool that will work equally well in assembly, C and C++.
GetErrorMessageLib.c (compiled to GetErrorMessageLib.dll)
#include <Windows.h>
/***
* returns 0 if there was enough space, size of buffer in bytes needed
* to fit the result, if there wasn't enough space. -1 on error.
*/
__declspec(dllexport)
int GetErrorMessageA(DWORD dwErrorCode, LPSTR lpResult, DWORD dwBytes)
{
LPSTR tmp;
DWORD result_len;
result_len = FormatMessageA (
FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS | FORMAT_MESSAGE_ALLOCATE_BUFFER,
NULL,
dwErrorCode,
LANG_SYSTEM_DEFAULT,
(LPSTR)&tmp,
0,
NULL
);
if (result_len == 0) {
return -1;
}
// FormatMessage's return is 1 character too short.
++result_len;
strncpy(lpResult, tmp, dwBytes);
lpResult[dwBytes - 1] = 0;
LocalFree((HLOCAL)tmp);
if (result_len <= dwBytes) {
return 0;
} else {
return result_len;
}
}
/***
* returns 0 if there was enough space, size of buffer in bytes needed
* to fit the result, if there wasn't enough space. -1 on error.
*/
__declspec(dllexport)
int GetErrorMessageW(DWORD dwErrorCode, LPWSTR lpResult, DWORD dwBytes)
{
LPWSTR tmp;
DWORD nchars;
DWORD result_bytes;
nchars = dwBytes >> 1;
result_bytes = 2 * FormatMessageW (
FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS | FORMAT_MESSAGE_ALLOCATE_BUFFER,
NULL,
dwErrorCode,
LANG_SYSTEM_DEFAULT,
(LPWSTR)&tmp,
0,
NULL
);
if (result_bytes == 0) {
return -1;
}
// FormatMessage's return is 1 character too short.
result_bytes += 2;
wcsncpy(lpResult, tmp, nchars);
lpResult[nchars - 1] = 0;
LocalFree((HLOCAL)tmp);
if (result_bytes <= dwBytes) {
return 0;
} else {
return result_bytes * 2;
}
}
inline version(GetErrorMessage.h):
#ifndef GetErrorMessage_H
#define GetErrorMessage_H
#include <Windows.h>
/***
* returns 0 if there was enough space, size of buffer in bytes needed
* to fit the result, if there wasn't enough space. -1 on error.
*/
static inline int GetErrorMessageA(DWORD dwErrorCode, LPSTR lpResult, DWORD dwBytes)
{
LPSTR tmp;
DWORD result_len;
result_len = FormatMessageA (
FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS | FORMAT_MESSAGE_ALLOCATE_BUFFER,
NULL,
dwErrorCode,
LANG_SYSTEM_DEFAULT,
(LPSTR)&tmp,
0,
NULL
);
if (result_len == 0) {
return -1;
}
// FormatMessage's return is 1 character too short.
++result_len;
strncpy(lpResult, tmp, dwBytes);
lpResult[dwBytes - 1] = 0;
LocalFree((HLOCAL)tmp);
if (result_len <= dwBytes) {
return 0;
} else {
return result_len;
}
}
/***
* returns 0 if there was enough space, size of buffer in bytes needed
* to fit the result, if there wasn't enough space. -1 on error.
*/
static inline int GetErrorMessageW(DWORD dwErrorCode, LPWSTR lpResult, DWORD dwBytes)
{
LPWSTR tmp;
DWORD nchars;
DWORD result_bytes;
nchars = dwBytes >> 1;
result_bytes = 2 * FormatMessageW (
FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS | FORMAT_MESSAGE_ALLOCATE_BUFFER,
NULL,
dwErrorCode,
LANG_SYSTEM_DEFAULT,
(LPWSTR)&tmp,
0,
NULL
);
if (result_bytes == 0) {
return -1;
}
// FormatMessage's return is 1 character too short.
result_bytes += 2;
wcsncpy(lpResult, tmp, nchars);
lpResult[nchars - 1] = 0;
LocalFree((HLOCAL)tmp);
if (result_bytes <= dwBytes) {
return 0;
} else {
return result_bytes * 2;
}
}
#endif /* GetErrorMessage_H */
dynamic usecase(assumed that error code is valid, otherwise a -1 check is needed):
#include <Windows.h>
#include <Winbase.h>
#include <assert.h>
#include <stdio.h>
int main(int argc, char **argv)
{
int (*GetErrorMessageA)(DWORD, LPSTR, DWORD);
int (*GetErrorMessageW)(DWORD, LPWSTR, DWORD);
char result1[260];
wchar_t result2[260];
assert(LoadLibraryA("GetErrorMessageLib.dll"));
GetErrorMessageA = (int (*)(DWORD, LPSTR, DWORD))GetProcAddress (
GetModuleHandle("GetErrorMessageLib.dll"),
"GetErrorMessageA"
);
GetErrorMessageW = (int (*)(DWORD, LPWSTR, DWORD))GetProcAddress (
GetModuleHandle("GetErrorMessageLib.dll"),
"GetErrorMessageW"
);
GetErrorMessageA(33, result1, sizeof(result1));
GetErrorMessageW(33, result2, sizeof(result2));
puts(result1);
_putws(result2);
return 0;
}
regular use case(assumes error code is valid, otherwise -1 return check is needed):
#include <stdio.h>
#include "GetErrorMessage.h"
#include <stdio.h>
int main(int argc, char **argv)
{
char result1[260];
wchar_t result2[260];
GetErrorMessageA(33, result1, sizeof(result1));
puts(result1);
GetErrorMessageW(33, result2, sizeof(result2));
_putws(result2);
return 0;
}
example using with assembly gnu as in MinGW32(again, assumed that error code is valid, otherwise -1 check is needed).
.global _WinMain@16
.section .text
_WinMain@16:
// eax = LoadLibraryA("GetErrorMessageLib.dll")
push $sz0
call _LoadLibraryA@4 // stdcall, no cleanup needed
// eax = GetProcAddress(eax, "GetErrorMessageW")
push $sz1
push %eax
call _GetProcAddress@8 // stdcall, no cleanup needed
// (*eax)(errorCode, szErrorMessage)
push $200
push $szErrorMessage
push errorCode
call *%eax // cdecl, cleanup needed
add $12, %esp
push $szErrorMessage
call __putws // cdecl, cleanup needed
add $4, %esp
ret $16
.section .rodata
sz0: .asciz "GetErrorMessageLib.dll"
sz1: .asciz "GetErrorMessageW"
errorCode: .long 33
.section .data
szErrorMessage: .space 200
result: The process cannot access the file because another process has locked a portion of the file.
Here is another way, by rotating element
with the scrollbar
for 180deg,
wrapping it's content
into another element, and rotating
that wrapper
for -180deg
.
Check the snippet below
div {_x000D_
display: inline-block;_x000D_
width: 100px;_x000D_
height: 100px;_x000D_
border: 2px solid black;_x000D_
margin: 15px;_x000D_
}_x000D_
#vertical {_x000D_
direction: rtl;_x000D_
overflow-y: scroll;_x000D_
overflow-x: hidden;_x000D_
background: gold;_x000D_
}_x000D_
#vertical p {_x000D_
direction: ltr;_x000D_
margin-bottom: 0;_x000D_
}_x000D_
#horizontal {_x000D_
direction: rtl;_x000D_
transform: rotate(180deg);_x000D_
overflow-y: hidden;_x000D_
overflow-x: scroll;_x000D_
background: tomato;_x000D_
padding-top: 30px;_x000D_
}_x000D_
#horizontal span {_x000D_
direction: ltr;_x000D_
display: inline-block;_x000D_
transform: rotate(-180deg);_x000D_
}
_x000D_
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>_x000D_
<div id=vertical>_x000D_
<p>content_x000D_
<br>content_x000D_
<br>content_x000D_
<br>content_x000D_
<br>content_x000D_
<br>content_x000D_
<br>content_x000D_
<br>content_x000D_
<br>content_x000D_
<br>content_x000D_
<br>content_x000D_
<br>content_x000D_
<br>content</p>_x000D_
</div>_x000D_
<div id=horizontal><span> content_content_content_content_content_content_content_content_content_content_content_content_content_content</span>_x000D_
</div>
_x000D_
tried the above methods but mine stopped auto-compile when it felt like it, due to maximum files to watch have passed the limit.
run cat /proc/sys/fs/inotify/max_user_watches
command .
if it's showing fewer files count including node_modules then open the file
/etc/sysctl.conf
in root privilege and append
fs.inotify.max_user_watches=524288
into the file and save
run again the cat command to see the result. It will work! hopefully!
In some systems, attempts to speed up the assembly of fully resolved '.c' files call the pre-assembly of include files "compiling header files". However, it is an optimization technique that is not necessary for actual C development.
Such a technique basically computed the include statements and kept a cache of the flattened includes. Normally the C toolchain will cut-and-paste in the included files recursively, and then pass the entire item off to the compiler. With a pre-compiled header cache, the tool chain will check to see if any of the inputs (defines, headers, etc) have changed. If not, then it will provide the already flattened text file snippets to the compiler.
Such systems were intended to speed up development; however, many such systems were quite brittle. As computers sped up, and source code management techniques changed, fewer of the header pre-compilers are actually used in the common project.
Until you actually need compilation optimization, I highly recommend you avoid pre-compiling headers.
If you are generating new *.json or modifying existing josn file the use "indent" parameter for pretty view json format.
import json
responseData = json.loads(output)
with open('twitterData.json','w') as twitterDataFile:
json.dump(responseData, twitterDataFile, indent=4)
You won´t believe me! I´ve just removed a comment block from my .sql file and now it works.
CREATE DATABASE IF NOT EXISTS `issga` /*!40100 DEFAULT CHARACTER SET utf8 */;
USE `issga`;
--
-- Table structure for table `protocolo`
--
DROP TABLE IF EXISTS protocolo;
/*!40101 SET @saved_cs_client = @@character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE protocolo (
`idProtocolo` int(11) NOT NULL AUTO_INCREMENT,
`tipo` varchar(30) DEFAULT NULL,
`estado` int(2) DEFAULT 0,
PRIMARY KEY (`idProtocolo`)
) ENGINE=InnoDB AUTO_INCREMENT=142 DEFAULT CHARSET=utf8;
/*!40101 SET character_set_client = @saved_cs_client */;
--
-- Dumping data for table `protocolo`
--
LOCK TABLES protocolo WRITE;
/*!40000 ALTER TABLE protocolo DISABLE KEYS */;
/* INSERT INTO `protocolo` VALUES () */
/*!40000 ALTER TABLE protocolo ENABLE KEYS */;
UNLOCK TABLES;
The deleted comment block was this:
--
-- Table structure for table `protocolo`
--
I´ve left the problematic table alone in the same .sql file. After that I´ve removed comments, the only code was left, and the error disappears.
if some reason two versions of jQuery are loaded (which is not recommended), calling $.noConflict(true)
from the second version will return the globally scoped jQuery variables to those of the first version.
Sometimes it could be issue with older version (or not stable) of JQuery files
Solution use $.noConflict();
<script src="js/jquery.js" type="text/javascript"></script>
<script src="js/jquery.dataTables.js" type="text/javascript"></script>
<script>
$.noConflict();
jQuery( document ).ready(function( $ ) {
$('#myTable').DataTable();
});
// Code that uses other library's $ can follow here.
</script>
You can use strptime
in the datetime
package of Python:
>>> import datetime
>>> datetime.datetime.strptime('24052010', "%d%m%Y").date()
datetime.date(2010, 5, 24)
If you would like a software tool to do this, you might like to check out this step-by-step guide:
"How to Validate and Import Excel spreadsheet to SQL Server database"
dump this into a more specific collection of just the ids you don't want
var notTheseBarIds = filterBars.Select(fb => fb.BarId);
then try this:
fooSelect = (from f in fooBunch
where !notTheseBarIds.Contains(f.BarId)
select f).ToList();
or this:
fooSelect = fooBunch.Where(f => !notTheseBarIds.Contains(f.BarId)).ToList();
sample
As of v0.20.0, you can use pd.DataFrame.sample
, which can be used to return a random sample of a fixed number rows, or a percentage of rows:
df = df.sample(n=k) # k rows
df = df.sample(frac=k) # int(len(df.index) * k) rows
For reproducibility, you can specify an integer random_state
, equivalent to using np.ramdom.seed
. So, instead of setting, for example, np.random.seed = 0
, you can:
df = df.sample(n=k, random_state=0)
If the above solutions are not working for me, one thing to check is that you actually have the public key too (typically id_rsa.pub
). It is unusual not to, but that was the cause for me.
To create your public key from your private key:
ssh-keygen -y -f ~/.ssh/id_rsa > ~/.ssh/id_rsa.pub
-XX:PermSize -XX:MaxPermSize
are used to set size for Permanent Generation.
Permanent Generation: The Permanent Generation is where class files are kept. These are the result of compiled classes and JSP pages. If this space is full, it triggers a Full Garbage Collection. If the Full Garbage Collection cannot clean out old unreferenced classes and there is no room left to expand the Permanent Space, an Out-of- Memory error (OOME) is thrown and the JVM will crash.
value = value.setScale(2, RoundingMode.CEILING)
Reading these answers, I can see a lot relating to Spring version 4.x, I am using version 3.2.0 for various reasons. So things like json support straight from the content()
is not possible.
I found that using MockMvcResultMatchers.jsonPath
is really easy and works a treat. Here is an example testing a post method.
The bonus with this solution is that you're still matching on attributes, not relying on full json string comparisons.
(Using org.springframework.test.web.servlet.result.MockMvcResultMatchers
)
String expectedData = "some value";
mockMvc.perform(post("/endPoint")
.contentType(MediaType.APPLICATION_JSON)
.content(mockRequestBodyAsString.getBytes()))
.andExpect(status().isOk())
.andExpect(MockMvcResultMatchers.jsonPath("$.data").value(expectedData));
The request body was just a json string, which you can easily load from a real json mock data file if you wanted, but I didnt include that here as it would have deviated from the question.
The actual json returned would have looked like this:
{
"data":"some value"
}
Use the python glob module to easily list out the files we need.
import glob
path_csv=glob.glob("../data/subfolrder/*.csv")
Here is another solution if you want to include different browsers in on file. If you and Mac user, from sublime menu go to, Tools > New Plugin. Delete the generated code and past the following:
import sublime, sublime_plugin
import webbrowser
class OpenBrowserCommand(sublime_plugin.TextCommand):
def run(self,edit,keyPressed):
url = self.view.file_name()
if keyPressed == "1":
navegator = webbrowser.get("open -a /Applications/Firefox.app %s")
if keyPressed == "2":
navegator = webbrowser.get("open -a /Applications/Google\ Chrome.app %s")
if keyPressed == "3":
navegator = webbrowser.get("open -a /Applications/Safari.app %s")
navegator.open_new(url)
Save. Then open up User Keybindings. (Tools > Command Palette > "User Key bindings"), and add this somewhere to the list:
{ "keys": ["alt+1"], "command": "open_browser", "args": {"keyPressed": "1"}},
{ "keys": ["alt+2"], "command": "open_browser", "args": {"keyPressed": "2"}},
{ "keys": ["alt+3"], "command": "open_browser", "args": {"keyPressed": "3"}}
Now open any html file in Sublime and use one of the keybindings, which it would open that file in your favourite browser.
For Temporary change use following command
set global sql_mode="NO_BACKSLASH_ESCAPES,STRICT_TRANS_TABLE,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION"
For permanent change : go to config file /etc/my.cnf or /etc/mysql/mysql.conf.d/mysqld.cnf and add following lines then restart mysql service
[mysqld]
sql_mode = "STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION"
A checkbox does not have background color.
But to add the effect, you may wrap each checkbox with a div
that has color:
<div class="evenRow">
<input type="checkbox" />
</div>
<div class="oddRow">
<input type="checkbox" />
</div>
<div class="evenRow">
<input type="checkbox" />
</div>
<div class="oddRow">
<input type="checkbox" />
</div>
On a fresh Debian image, cloning https://github.com/python/cpython and running:
sudo apt-get update
sudo apt-get upgrade
sudo apt-get dist-upgrade
sudo apt-get install build-essential python-dev python-setuptools python-pip python-smbus
sudo apt-get install libncursesw5-dev libgdbm-dev libc6-dev
sudo apt-get install zlib1g-dev libsqlite3-dev tk-dev
sudo apt-get install libssl-dev openssl
sudo apt-get install libffi-dev
Now execute the configure
file cloned above:
./configure
make # alternatively `make -j 4` will utilize 4 threads
sudo make altinstall
Got 3.7 installed and working for me.
Looks like I said I would update this answer with some more explanation and two years later I don't have much to add.
python-dev
might be necessary.altinstall
as opposed to install
argument in the make command.Aside from that I guess the choice would be to either read through the cpython codebase looking for #include
directives that need to be met, but what I usually do is keep trying to install the package and just keep reading through the output installing the required packages until it succeeds.
Reminds me of the story of the Engineer, the Manager and the Programmer whose car rolls down a hill.
I use this technique for pagination. I do not fetch all the rows. For example, if my page needs to display the top 100 rows I fetch only the 100 with where clause. The output of the SQL should have a unique key.
The table has the following:
ID, KeyId, Rank
The same rank will be assigned for more than one KeyId.
SQL is select top 2 * from Table1 where Rank >= @Rank and ID > @Id
For the first time I pass 0 for both. The second time pass 1 & 14. 3rd time pass 2 and 6....
The value of the 10th record Rank & Id is passed to the next
11 21 1
14 22 1
7 11 1
6 19 2
12 31 2
13 18 2
This will have the least stress on the system
On Linux there is also a very neat tool that can tell right away what each error code means. On Ubuntu: apt-get install errno
.
Then if for example you want to get the description of error type 2, just type errno 2
in the terminal.
With errno -l
you get a list with all errors and their descriptions. Much easier that other methods mentioned by previous posters.
You can also use STDIN.each_line
, and STDIN.each_line.to_a
to get it as an array.
e.g.
STDIN.each_line do |line|
puts line
end
It exists, and it's built into Eclipse! Go to the Remote Systems view, and you'll see an entry for "Local". Right-click "Local Shells" and choose "Launch Shell."
You can't launch it directly from the project navigator. But you can right-click in the navigator and choose "Show in Remote Systems view". From there you can right-click the parent folder and choose "Launch Shell."
Aptana also has a Terminal view, and a command to open the selected file in the terminal.
As you can see, the code public Circle(double r).... how is that different from what I did in mine with public CircleR(double r)? For whatever reason, no error is given in the code from the book, however mine says there is an error there.
When defining constructors of a class, they should have the same name as its class. Thus the following code
public class Circle
{
//This part is called the constructor and lets us specify the radius of a
//particular circle.
public Circle(double r)
{
radius = r;
}
....
}
is correct while your code
public class Circle
{
private double radius;
public CircleR(double r)
{
radius = r;
}
public diameter()
{
double d = radius * 2;
return d;
}
}
is wrong because your constructor has different name from its class. You could either follow the same code from the book and change your constructor from
public CircleR(double r)
to
public Circle(double r)
or (if you really wanted to name your constructor as CircleR) rename your class to CircleR.
So your new class should be
public class CircleR
{
private double radius;
public CircleR(double r)
{
radius = r;
}
public double diameter()
{
double d = radius * 2;
return d;
}
}
I also added the return type double in your method as pointed out by Froyo and John B.
Refer to this article about constructors.
HTH.
Swift is statically typed so the performSelector:
methods are to fall by the wayside.
Instead, use GCD to dispatch a suitable block to the relevant queue — in this case it'll presumably be the main queue since it looks like you're doing UIKit work.
EDIT: the relevant performSelector:
is also notably missing from the Swift version of the NSRunLoop
documentation ("1 Objective-C symbol hidden") so you can't jump straight in with that. With that and its absence from the Swiftified NSObject
I'd argue it's pretty clear what Apple is thinking here.
in Manifest file which activity you want to use in "portrait" you must write these code in Activity tag
android:screenOrientation="portrait"
like this
android:icon="@drawable/icon"
android:name="com.zemkoapps.hd.wallpaper.AndroidGridLayoutActivity"
android:screenOrientation="portrait" >
but if u want screen in landscape use this code like this
android:screenOrientation="landscape"
In addition to RAWA answer, this peace of code:
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
startForegroundService(intent)
} else {
startService(intent)
}
You can change to:
ContextCompat.startForegroundService(context, yourIntent);
If you will look inside this method then you can see that this method do all checking work for you.
Just in case you are working on php less then 5.2 you can use this resourse.
http://techblog.willshouse.com/2009/06/12/using-json_encode-and-json_decode-in-php4/
Technically, there's no built-in command to edit an existing symbolic link. It can be easily achieved with a few short commands.
Here's a little bash/zsh function I wrote to update an existing symbolic link:
# -----------------------------------------
# Edit an existing symbolic link
#
# @1 = Name of symbolic link to edit
# @2 = Full destination path to update existing symlink with
# -----------------------------------------
function edit-symlink () {
if [ -z "$1" ]; then
echo "Name of symbolic link you would like to edit:"
read LINK
else
LINK="$1"
fi
LINKTMP="$LINK-tmp"
if [ -z "$2" ]; then
echo "Full destination path to update existing symlink with:"
read DEST
else
DEST="$2"
fi
ln -s $DEST $LINKTMP
rm $LINK
mv $LINKTMP $LINK
printf "Updated $LINK to point to new destination -> $DEST"
}
How come no-one seems to like repr
?
python 3.7.2:
>>> int_list = [1, 2, 3, 4, 5]
>>> print(repr(int_list))
[1, 2, 3, 4, 5]
>>>
Take care though, it's an explicit representation. An example shows:
#Print repr(object) backwards
>>> print(repr(int_list)[::-1])
]5 ,4 ,3 ,2 ,1[
>>>
more info at pydocs-repr
<option value="" selected style="display:none">Please select one item</option>
Using selected
and using display: none;
for hidden item in list.
Just use :
android:backgroundTint="#f816a463"
Instead of:
android:background="#f816a463"
Don't forget to change your Button
to android.support.v7.widget.AppCompatButton
One option is, you can wrap the submit
button with a form
Something like this:
<form action="{% url path.to.request_page %}" method="POST">
<input id="submit" type="button" value="Click" />
</form>
(remove the onclick
and method
)
If you want to load a specific part of the page, without page reload - you can do
<input id="submit" type="button" value="Click" data_url/>
and on a submit
listener
$(function(){
$('form').on('submit', function(e){
e.preventDefault();
$.ajax({
url: $(this).attr('action'),
method: $(this).attr('method'),
success: function(data){ $('#target').html(data) }
});
});
});
Depends ay which point you wish to "catch" the value.
For instance, if you want to catch the value as soon as the user changes the spinner selected item, use the listener approach (provided by jalopaba)
If you rather catch the value when a user performs the final task like clicking a Submit button, or something, then the answer provided by Rich is better.
It also works without jQuery if you do the following changes:
Add type="button"
to the edit button in order not to trigger submission of the form.
Change the name of your function from change()
to anything else.
Don't use hidden="hidden"
, use CSS instead: style="display: none;"
.
The following code works for me:
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<link rel="STYLESHEET" type="text/css" href="dba_style/buttons.css" />
<title>Untitled Document</title>
</head>
<script type="text/javascript">
function do_change(){
document.getElementById("save").style.display = "block";
document.getElementById("change").style.display = "block";
document.getElementById("cancel").style.display = "block";
}
</script>
<body>
<form name="form1" method="post" action="">
<div class="buttons">
<button type="button" class="regular" name="edit" id="edit" onclick="do_change(); return false;">
<img src="dba_images/textfield_key.png" alt=""/>
Edit
</button>
<button type="submit" class="positive" name="save" id="save" style="display:none;">
<img src="dba_images/apply2.png" alt=""/>
Save
</button>
<button class="regular" name="change" id="change" style="display:none;">
<img src="dba_images/textfield_key.png" alt=""/>
change
</button>
<button class="negative" name="cancel" id="cancel" style="display:none;">
<img src="dba_images/cross.png" alt=""/>
Cancel
</button>
</div>
</form>
</body>
</html>
This is so simple. Try:
import datetime
date_time = str(datetime.datetime.now())
date = date_time.split()[0]
time = date_time.split()[1]
This is what i ended up doing
//import ../../Constants;
public class RequestFilter implements Filter {
private static final Logger logger = LoggerFactory.getLogger(RequestFilter.class);
@Override
public void init(FilterConfig filterConfig) throws ServletException {
}
@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain)
throws IOException, ServletException {
try {
CustomHttpServletRequest customHttpServletRequest = new CustomHttpServletRequest((HttpServletRequest) servletRequest);
filterChain.doFilter(customHttpServletRequest, servletResponse);
} finally {
//do something here
}
}
@Override
public void destroy() {
}
public static Map<String, String[]> ADMIN_QUERY_PARAMS = new HashMap<String, String[]>() {
{
put("diagnostics", new String[]{"false"});
put("skipCache", new String[]{"false"});
}
};
/*
This is a custom wrapper over the `HttpServletRequestWrapper` which
overrides the various header getter methods and query param getter methods.
Changes to the request pojo are
=> A custom header is added whose value is a unique id
=> Admin query params are set to default values in the url
*/
private class CustomHttpServletRequest extends HttpServletRequestWrapper {
public CustomHttpServletRequest(HttpServletRequest request) {
super(request);
//create custom id (to be returned) when the value for a
//particular header is asked for
internalRequestId = RandomStringUtils.random(10, true, true) + "-local";
}
public String getHeader(String name) {
String value = super.getHeader(name);
if(Strings.isNullOrEmpty(value) && isRequestIdHeaderName(name)) {
value = internalRequestId;
}
return value;
}
private boolean isRequestIdHeaderName(String name) {
return Constants.RID_HEADER.equalsIgnoreCase(name) || Constants.X_REQUEST_ID_HEADER.equalsIgnoreCase(name);
}
public Enumeration<String> getHeaders(String name) {
List<String> values = Collections.list(super.getHeaders(name));
if(values.size()==0 && isRequestIdHeaderName(name)) {
values.add(internalRequestId);
}
return Collections.enumeration(values);
}
public Enumeration<String> getHeaderNames() {
List<String> names = Collections.list(super.getHeaderNames());
names.add(Constants.RID_HEADER);
names.add(Constants.X_REQUEST_ID_HEADER);
return Collections.enumeration(names);
}
public String getParameter(String name) {
if (ADMIN_QUERY_PARAMS.get(name) != null) {
return ADMIN_QUERY_PARAMS.get(name)[0];
}
return super.getParameter(name);
}
public Map<String, String[]> getParameterMap() {
Map<String, String[]> paramsMap = new HashMap<>(super.getParameterMap());
for (String paramName : ADMIN_QUERY_PARAMS.keySet()) {
if (paramsMap.get(paramName) != null) {
paramsMap.put(paramName, ADMIN_QUERY_PARAMS.get(paramName));
}
}
return paramsMap;
}
public String[] getParameterValues(String name) {
if (ADMIN_QUERY_PARAMS.get(name) != null) {
return ADMIN_QUERY_PARAMS.get(name);
}
return super.getParameterValues(name);
}
public String getQueryString() {
Map<String, String[]> map = getParameterMap();
StringBuilder builder = new StringBuilder();
for (String param: map.keySet()) {
for (String value: map.get(param)) {
builder.append(param).append("=").append(value).append("&");
}
}
builder.deleteCharAt(builder.length() - 1);
return builder.toString();
}
}
}
If you are using unmanaged oracle client (Oracle.DataAccess) then the fastest way is to use OracleBulkCopy, as was pointed by Tarik.
If you are using latest managed oracle client (Oracle.ManagedDataAccess) then the fastest way is to use array binding, as was pointed by Damien. If you wish keep your application code clean from array binding specifics, you could write your own implementation of OracleBulkCopy using array binding.
Here is usage example from real project:
var bulkWriter = new OracleDbBulkWriter();
bulkWriter.Write(
connection,
"BULK_WRITE_TEST",
Enumerable.Range(1, 10000).Select(v => new TestData { Id = v, StringValue=v.ToString() }).ToList());
10K records are inserted in 500ms!
Here is implementation:
public class OracleDbBulkWriter : IDbBulkWriter
{
public void Write<T>(IDbConnection connection, string targetTableName, IList<T> data, IList<ColumnToPropertyMapping> mappings = null)
{
if (connection == null)
{
throw new ArgumentNullException(nameof(connection));
}
if (string.IsNullOrEmpty(targetTableName))
{
throw new ArgumentNullException(nameof(targetTableName));
}
if (data == null)
{
throw new ArgumentNullException(nameof(data));
}
if (mappings == null)
{
mappings = GetGenericMappings<T>();
}
mappings = GetUniqueMappings<T>(mappings);
Dictionary<string, Array> parameterValues = InitializeParameterValues<T>(mappings, data.Count);
FillParameterValues(parameterValues, data);
using (var command = CreateCommand(connection, targetTableName, mappings, parameterValues))
{
command.ExecuteNonQuery();
}
}
private static IDbCommand CreateCommand(IDbConnection connection, string targetTableName, IList<ColumnToPropertyMapping> mappings, Dictionary<string, Array> parameterValues)
{
var command = (OracleCommandWrapper)connection.CreateCommand();
command.ArrayBindCount = parameterValues.First().Value.Length;
foreach(var mapping in mappings)
{
var parameter = command.CreateParameter();
parameter.ParameterName = mapping.Column;
parameter.Value = parameterValues[mapping.Property];
command.Parameters.Add(parameter);
}
command.CommandText = $@"insert into {targetTableName} ({string.Join(",", mappings.Select(m => m.Column))}) values ({string.Join(",", mappings.Select(m => $":{m.Column}")) })";
return command;
}
private IList<ColumnToPropertyMapping> GetGenericMappings<T>()
{
var accessor = TypeAccessor.Create(typeof(T));
var mappings = accessor.GetMembers()
.Select(m => new ColumnToPropertyMapping(m.Name, m.Name))
.ToList();
return mappings;
}
private static IList<ColumnToPropertyMapping> GetUniqueMappings<T>(IList<ColumnToPropertyMapping> mappings)
{
var accessor = TypeAccessor.Create(typeof(T));
var members = new HashSet<string>(accessor.GetMembers().Select(m => m.Name));
mappings = mappings
.Where(m => m != null && members.Contains(m.Property))
.GroupBy(m => m.Column)
.Select(g => g.First())
.ToList();
return mappings;
}
private static Dictionary<string, Array> InitializeParameterValues<T>(IList<ColumnToPropertyMapping> mappings, int numberOfRows)
{
var values = new Dictionary<string, Array>(mappings.Count);
var accessor = TypeAccessor.Create(typeof(T));
var members = accessor.GetMembers().ToDictionary(m => m.Name);
foreach(var mapping in mappings)
{
var member = members[mapping.Property];
values[mapping.Property] = Array.CreateInstance(member.Type, numberOfRows);
}
return values;
}
private static void FillParameterValues<T>(Dictionary<string, Array> parameterValues, IList<T> data)
{
var accessor = TypeAccessor.Create(typeof(T));
for (var rowNumber = 0; rowNumber < data.Count; rowNumber++)
{
var row = data[rowNumber];
foreach (var pair in parameterValues)
{
Array parameterValue = pair.Value;
var propertyValue = accessor[row, pair.Key];
parameterValue.SetValue(propertyValue, rowNumber);
}
}
}
}
NOTE: this implementation uses Fastmember package for optimized access to properties(much faster than reflection)
You are looking for the cp
command. You need to change directories so that you are outside of the directory you are trying to copy.
If the directory you're copying is called dir1
and you want to copy it to your /home/Pictures
folder:
cp -r dir1/ ~/Pictures/
Linux is case-sensitive and also needs the /
after each directory to know that it isn't a file. ~
is a special character in the terminal that automatically evaluates to the current user's home directory. If you need to know what directory you are in, use the command pwd
.
When you don't know how to use a Linux command, there is a manual page that you can refer to by typing:
man [insert command here]
at a terminal prompt.
Also, to auto complete long file paths when typing in the terminal, you can hit Tab after you've started typing the path and you will either be presented with choices, or it will insert the remaining part of the path.
If you are using JDK 9+, you can do this:
java {
sourceCompatibility = JavaVersion.VERSION_1_8
targetCompatibility = JavaVersion.VERSION_1_8
}
tasks.withType<JavaCompile> {
options.compilerArgs.addAll(arrayOf("--release", "8"))
}
You can also see the following related issues:
-release
compiler argumentHere is what you are looking for:
Service hangs up at WaitForExit after calling batch file
It's about a question as to why a service can't execute a file, but it shows all the code necessary to do so.
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<!-- default -->
<item
android:state_pressed="false"
android:state_focused="false">
<shape
android:innerRadiusRatio="1"
android:shape="rectangle" >
<solid android:color="#00a3e2" />
<padding
android:bottom="10dp"
android:left="10dp"
android:right="10dp"
android:top="10dp" />
</shape>
</item>
<!-- button focused -->
<item
android:state_pressed="false"
android:state_focused="true">
<shape
android:innerRadiusRatio="1"
android:shape="rectangle" >
<solid android:color="#5a97f5" />
<padding
android:bottom="5dp"
android:left="10dp"
android:right="10dp"
android:top="5dp" />
</shape></item>
<!-- button pressed -->
<item
android:state_pressed="true"
android:state_focused="false">
<shape
android:innerRadiusRatio="1"
android:shape="rectangle" >
<solid android:color="#478df9"/>
<padding
android:bottom="10dp"
android:left="10dp"
android:right="10dp"
android:top="10dp" />
</shape></item>
</selector>
As described by Eran Chinthaka at http://wso2.com/library/176/
If Axis2 engine cannot find a service and an operation for a message, it immediately fails, sending a fault to the sender. If service not found - "Service Not found EPR is " If service found but not an operation- "Operation Not found EPR is and WSA Action = "
In your case the service is found but the operation not. The Axis2 engine uses SOAPAction in order to figure out the requested operation and, in your example, the SOAPAction is missing, therefore I would try to define the SOAPAction header
One way to control your DialogFragment
's width and height is to make sure its dialog respects your view's width and height if their value is WRAP_CONTENT
.
ThemeOverlay.AppCompat.Dialog
One simple way to achieve this is to make use of the ThemeOverlay.AppCompat.Dialog
style that's included in Android Support Library.
DialogFragment
with Dialog
:
@NonNull
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
LayoutInflater inflater = LayoutInflater.from(getContext());
View view = inflater.inflate(R.layout.dialog_view, null);
Dialog dialog = new Dialog(getContext(), R.style.ThemeOverlay_AppCompat_Dialog);
dialog.setContentView(view);
return dialog;
}
DialogFragment
with AlertDialog
(caveat: minHeight="48dp"
):
@NonNull
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
LayoutInflater inflater = LayoutInflater.from(getContext());
View view = inflater.inflate(R.layout.dialog_view, null);
AlertDialog.Builder builder = new AlertDialog.Builder(getContext(), R.style.ThemeOverlay_AppCompat_Dialog);
builder.setView(view);
return builder.create();
}
You can also set ThemeOverlay.AppCompat.Dialog
as the default theme when creating your dialogs, by adding it to your app's xml theme.
Be careful, as many dialogs do need the default minimum width to look good.
<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
<!-- For Android Dialog. -->
<item name="android:dialogTheme">@style/ThemeOverlay.AppCompat.Dialog</item>
<!-- For Android AlertDialog. -->
<item name="android:alertDialogTheme">@style/ThemeOverlay.AppCompat.Dialog</item>
<!-- For AppCompat AlertDialog. -->
<item name="alertDialogTheme">@style/ThemeOverlay.AppCompat.Dialog</item>
<!-- Other attributes. -->
</style>
DialogFragment
with Dialog
, making use of android:dialogTheme
:
@NonNull
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
LayoutInflater inflater = LayoutInflater.from(getContext());
View view = inflater.inflate(R.layout.dialog_view, null);
Dialog dialog = new Dialog(getContext());
dialog.setContentView(view);
return dialog;
}
DialogFragment
with AlertDialog
, making use of android:alertDialogTheme
or alertDialogTheme
(caveat: minHeight="48dp"
):
@NonNull
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
LayoutInflater inflater = LayoutInflater.from(getContext());
View view = inflater.inflate(R.layout.dialog_view, null);
AlertDialog.Builder builder = new AlertDialog.Builder(getContext());
builder.setView(view);
return builder.create();
}
On Older Android APIs, Dialog
s seem to have some width issues, because of their title (even if you don't set one).
If you don't want to use ThemeOverlay.AppCompat.Dialog
style and your Dialog
doesn't need a title (or has a custom one), you might want to disable it:
@NonNull
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
LayoutInflater inflater = LayoutInflater.from(getContext());
View view = inflater.inflate(R.layout.dialog_view, null);
Dialog dialog = new Dialog(getContext());
dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
dialog.setContentView(view);
return dialog;
}
I was trying to make the dialog respect the width and height of my layout, without specifying a fixed size programmatically.
I figured that android:windowMinWidthMinor
and android:windowMinWidthMajor
were causing the problem. Even though they were not included in the theme of my Activity
or Dialog
, they were still being applied to the Activity
theme, somehow.
I came up with three possible solutions.
Solution 1: create a custom dialog theme and use it when creating the dialog in the DialogFragment
.
<style name="Theme.Material.Light.Dialog.NoMinWidth" parent="android:Theme.Material.Light.Dialog">
<item name="android:windowMinWidthMinor">0dip</item>
<item name="android:windowMinWidthMajor">0dip</item>
</style>
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
return new Dialog(getActivity(), R.style.Theme_Material_Light_Dialog_NoMinWidth);
}
Solution 2: create a custom theme to be used in a ContextThemeWrapper
that will serve as Context
for the dialog. Use this if you don't want to create a custom dialog theme (for instance, when you want to use the theme specified by android:dialogTheme
).
<style name="Theme.Window.NoMinWidth" parent="">
<item name="android:windowMinWidthMinor">0dip</item>
<item name="android:windowMinWidthMajor">0dip</item>
</style>
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
return new Dialog(new ContextThemeWrapper(getActivity(), R.style.Theme_Window_NoMinWidth), getTheme());
}
Solution 3 (with an AlertDialog
): enforce android:windowMinWidthMinor
and android:windowMinWidthMajor
into the ContextThemeWrapper
created by the AlertDialog$Builder
.
<style name="Theme.Window.NoMinWidth" parent="">
<item name="android:windowMinWidthMinor">0dip</item>
<item name="android:windowMinWidthMajor">0dip</item>
</style>
@Override
public final Dialog onCreateDialog(Bundle savedInstanceState) {
View view = new View(); // Inflate your view here.
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
builder.setView(view);
// Make sure the dialog width works as WRAP_CONTENT.
builder.getContext().getTheme().applyStyle(R.style.Theme_Window_NoMinWidth, true);
return builder.create();
}
re.findall finds all the occurrence of the regex in a string and return in a list. Here, you are using a list of strings, you need this to use re.findall
Note - If the regex fails, an empty list is returned.
import re, sys
f = open('picklee', 'r')
lines = f.readlines()
regex = re.compile(r'[A-Z]+')
for line in lines:
print (re.findall(regex, line))
SELECT a.file_name,
substr(A.tablespace_name,1,14) tablespace_name,
trunc(decode(A.autoextensible,'YES',A.MAXSIZE-A.bytes+b.free,'NO',b.free)/1024/1024) free_mb,
trunc(a.bytes/1024/1024) allocated_mb,
trunc(A.MAXSIZE/1024/1024) capacity,
a.autoextensible ae
FROM (
SELECT file_id, file_name,
tablespace_name,
autoextensible,
bytes,
decode(autoextensible,'YES',maxbytes,bytes) maxsize
FROM dba_data_files
GROUP BY file_id, file_name,
tablespace_name,
autoextensible,
bytes,
decode(autoextensible,'YES',maxbytes,bytes)
) a,
(SELECT file_id,
tablespace_name,
sum(bytes) free
FROM dba_free_space
GROUP BY file_id,
tablespace_name
) b
WHERE a.file_id=b.file_id(+)
AND A.tablespace_name=b.tablespace_name(+)
ORDER BY A.tablespace_name ASC;
You can try open a modal dialog with html5 and css3, try this code:
.windowModal {_x000D_
position: fixed;_x000D_
font-family: Arial, Helvetica, sans-serif;_x000D_
top: 0;_x000D_
right: 0;_x000D_
bottom: 0;_x000D_
left: 0;_x000D_
background: rgba(0,0,0,0.8);_x000D_
z-index: 99999;_x000D_
opacity:0;_x000D_
-webkit-transition: opacity 400ms ease-in;_x000D_
-moz-transition: opacity 400ms ease-in;_x000D_
transition: opacity 400ms ease-in;_x000D_
pointer-events: none;_x000D_
}_x000D_
.windowModal:target {_x000D_
opacity:1;_x000D_
pointer-events: auto;_x000D_
}_x000D_
_x000D_
.windowModal > div {_x000D_
width: 400px;_x000D_
position: relative;_x000D_
margin: 10% auto;_x000D_
padding: 5px 20px 13px 20px;_x000D_
border-radius: 10px;_x000D_
background: #fff;_x000D_
background: -moz-linear-gradient(#fff, #999);_x000D_
background: -webkit-linear-gradient(#fff, #999);_x000D_
background: -o-linear-gradient(#fff, #999);_x000D_
}_x000D_
.close {_x000D_
background: #606061;_x000D_
color: #FFFFFF;_x000D_
line-height: 25px;_x000D_
position: absolute;_x000D_
right: -12px;_x000D_
text-align: center;_x000D_
top: -10px;_x000D_
width: 24px;_x000D_
text-decoration: none;_x000D_
font-weight: bold;_x000D_
-webkit-border-radius: 12px;_x000D_
-moz-border-radius: 12px;_x000D_
border-radius: 12px;_x000D_
-moz-box-shadow: 1px 1px 3px #000;_x000D_
-webkit-box-shadow: 1px 1px 3px #000;_x000D_
box-shadow: 1px 1px 3px #000;_x000D_
}_x000D_
_x000D_
.close:hover { background: #00d9ff; }
_x000D_
<a href="#divModal">Open Modal Window</a>_x000D_
_x000D_
<div id="divModal" class="windowModal">_x000D_
<div>_x000D_
<a href="#close" title="Close" class="close">X</a>_x000D_
<h2>Modal Dialog</h2>_x000D_
<p>This example shows a modal window without using javascript only using html5 and css3, I try it it¡</p>_x000D_
<p>Using javascript, with new versions of html5 and css3 is not necessary can do whatever we want without using js libraries.</p>_x000D_
</div>_x000D_
</div>
_x000D_
Models don't exist in isolation. The structures you'd define for a simulation of cars entering a car park, an embedded system which guides you to a free space, a car parking billing system or for the automated gates/ticket machines usual in car parks are all different.
If you have a custom template and view you may exclude the field and use {{ modelform.instance.field }}
to get the value.
also you may prefer to use in the view:
form.fields['field_name'].widget = forms.HiddenInput()
but I'm not sure it will protect save method on post.
Hope it helps.