大约有 7,100 项符合查询结果（耗时：0.0350秒） [XML]
throwing exceptions out of a destructor
...mory for Object go? Where does the memory the object owned go? Is it still allocated (ostensibly because the destructor failed)? Consider also the object was in stack space, so its obviously gone regardless.
Then consider this case
class Object
{
Object2 obj2;
Object3* obj3;
virtual ~Obj...
Why are Objective-C delegates usually given the property assign instead of retain?
...wner
If B had retained A, A wouldn't be released, as B owns A, thus A's dealloc would never get called, causing both A and B to leak.
You shouldn't worry about A going away because it owns B and thus gets rid of it in dealloc.
...
MySQL error 2006: mysql server has gone away
...y be easier to check if the connection and re-establish it if needed.
See PHP:mysqli_ping for info on that.
share
|
improve this answer
|
follow
|
...
'0000-00-00 00:00:00' can not be represented as java.sql.Timestamp error
...er languages.
So, if I "just change the database", thousands of lines of PHP code will break.
Java programmers need to accept the MySQL zero-date and they need to put a zero date back into the database, when other languages rely on this "feature".
A programmer connecting to MySQL needs to handle...
jQuery, simple polling example
...
function poll(){
$("ajax.php", function(data){
//do stuff
});
}
setInterval(function(){ poll(); }, 5000);
share
|
improve this answ...
Shortcut to exit scale mode in VirtualBox [closed]
...rked like a charm for me.
Source: https://forums.virtualbox.org/viewtopic.php?f=8&t=47821
share
|
improve this answer
|
follow
|
...
Replace transparency in PNG images with white background
...do not forget to do backup. More info here: imagemagick.org/script/mogrify.php
– tro
Jun 22 '17 at 17:28
|
show 4 more comments
...
Smooth scroll to div id jQuery
...
You need to animate the html, body
DEMO http://jsfiddle.net/kevinPHPkevin/8tLdq/1/
$("#button").click(function() {
$('html, body').animate({
scrollTop: $("#myDiv").offset().top
}, 2000);
});
share...
Get current date/time in seconds
...
An application where I needed this was to work with a PHP back end as the time() function already returns this. It's also great for a time stamp as you can easily get the difference between time() being our current time and a time stamp from a previous time that had been stored ...
Create an index on a huge MySQL production table without table locking
...able users add index ddopsonfu (last_name, email, first_name, confirmation_token, current_sign_in_ip);'
echo "Index Update - FINISH"
sleep 0.05
kill $PID
time mysql -uroot website_development -e 'drop index ddopsonfu on users;'
My Server (InnoDB):
Server version: 5.5.25a Source distribution
Out...