大约有 30,000 项符合查询结果（耗时：0.0408秒） [XML]
What are the options for storing hierarchical data in a relational database? [closed]
...mns when inserting new items. well I created a stored procedure for it and called it every time I inserted a new item which was rare in my case but it is really fast.
I got the idea from the Joe Celko's book, and the stored procedure and how I came up with it is explained here in DBA SE
https://dba....
Illegal mix of collations (utf8_unicode_ci,IMPLICIT) and (utf8_general_ci,IMPLICIT) for operation '=
...e:
SET @rUsername = ‘aname’ COLLATE utf8_unicode_ci; -- COLLATE added
CALL updateProductUsers(@rUsername, @rProductID, @rPerm);
Option 2: add COLLATE to the WHERE clause:
CREATE PROCEDURE updateProductUsers(
IN rUsername VARCHAR(24),
IN rProductID INT UNSIGNED,
IN rPerm VARCHAR(1...
Capture HTML Canvas as gif/jpg/png/pdf?
...cation = canvas.toDataURL("image/png");
}
</script>
Theoretically this should create and then navigate to an image with a green square in the middle of it, but I haven't tested.
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What is the difference between _tmain() and main() in C++?
...ve three options when doing Windows programming:
Explicitly use Unicode (call wmain, and for every Windows API function which takes char-related arguments, call the -W version of the function. Instead of CreateWindow, call CreateWindowW). And instead of using char use wchar_t, and so on
Explicitly...
System.currentTimeMillis vs System.nanoTime
...ge in movement is directly proportional to the elapsed time since the last call and I want to be as precise as possible.
10...
How is this fibonacci-function memoized?
...onacci definition, fib n = fib (n-1) + fib (n-2), the function itself gets called, twice from the top, causing the exponential explosion. But with that trick, we set out a list for the interim results, and go "through the list":
fib n = (xs!!(n-1)) + (xs!!(n-2)) where xs = 0:1:map fib [2..]
The t...
Callback when CSS3 transition finishes
...s preferred as of jQuery 1.7. bind()
You can also use off() method on the callback function to ensure it will be fired only once. Here is an example which is equivalent to using one() method:
$("#someSelector")
.on("animationend webkitAnimationEnd oAnimationEnd MSAnimationEnd",
function(e){
/...
Creating PHP class instance with a string
...iable functions & methods.
$func = 'my_function';
$func('param1'); // calls my_function('param1');
$method = 'doStuff';
$object = new MyClass();
$object->$method(); // calls the MyClass->doStuff() method.
share...
How can I create a border around an Android LinearLayout?
...
Sure. You can add a border to any layout you want. Basically, you need to create a custom drawable and add it as a background to your layout. example:
Create a file called customborder.xml in your drawable folder:
<?xml version="1.0" encoding="UTF-8"?>
<shape xmlns:an...
Adding gif image in an ImageView in android
...nimationActivity: -
public class AnimationActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
InputStream stream = null;
try {
stream = getAssets().open("pi...