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Count Rows in Doctrine QueryBuilder
...
->getSingleScalarResult();
}
In some simple cases using EXTRA_LAZY entity relations is good
http://doctrine-orm.readthedocs.org/projects/doctrine-orm/en/latest/tutorials/extra-lazy-associations.html
share
...
How to force a web browser NOT to cache images
...ile.jpg&some-random-number-262376" />
Script:
// PHP
if( isset( $_GET['img'] ) && is_file( IMG_PATH . $_GET['img'] ) ) {
// read contents
$f = open( IMG_PATH . $_GET['img'] );
$img = $f.read();
$f.close();
// no-cache headers - complete set
// these copied from [php.n...
Why are dates calculated from January 1st, 1970?
...
Astronomers use their own epochal date: http://en.wikipedia.org/wiki/Epoch_(astronomy)
Why? A date has to be chosen to make the math work out. Any random date will work.
A date far in the past avoids negative numbers for the general case.
Some of the smarter packages use the proleptic Gregoria...
How to set default values in Rails?
...ay:
class SetDefault < ActiveRecord::Migration
def self.up
change_column :people, :last_name, :type, :default => "Doe"
end
def self.down
# You can't currently remove default values in Rails
raise ActiveRecord::IrreversibleMigration, "Can't remove the default"
end
end
Be...
Error starting jboss server
...tion. Did you change your JRE version when you reinstalled, say from 1.6.0_17 to _18?
Anyway, the workaround is described in the JIRA issue, and also here. You need to change the content of conf/bootstrap/profile.xml. Look for the definition of the AttachmentStore, and change the constructor line ...
C语言判断文件是否存在 - C/C++ - 清泛网 - 专注C/C++及内核技术
... <stdlib.h>
void main( void )
{
/* Check for existence */
if( (_access( "ACCESS.C", 0 )) != -1 )
{
printf( "File ACCESS.C exists\n" );
/* Check for write permission */
if( (_access( "ACCESS.C", 2 )) != -1 )
printf( "File ACCESS.C has write permission\n"...
Make the current commit the only (initial) commit in a Git repository?
...deleting original master branch, one can rename it git branch -m master old_master and set push mode to current-branch-only git config --local push.default current. This way one can keep historical commits in separate branch and work in sync with repo in the fresh master.
– Sew...
What happens to an open file handle on Linux if the pointed file gets moved or deleted
...-1 is returned, and errno is set
* appropriately.
*/
int check_fd_fine(int fd) {
struct stat _stat;
int ret = -1;
if(!fcntl(fd, F_GETFL)) {
if(!fstat(fd, &_stat)) {
if(_stat.st_nlink >= 1)
ret = 0;
else
p...
how do I make a single legend for many subplots with matplotlib?
...
There is also a nice function get_legend_handles_labels() you can call on the last axis (if you iterate over them) that would collect everything you need from label= arguments:
handles, labels = ax.get_legend_handles_labels()
fig.legend(handles, labels, loc...
Determine what attributes were changed in Rails after_save callback?
I'm setting up an after_save callback in my model observer to send a notification only if the model's published attribute was changed from false to true. Since methods such as changed? are only useful before the model is saved, the way I'm currently (and unsuccessfully) trying to do so is as fol...