大约有 45,000 项符合查询结果（耗时：0.0715秒） [XML]
What is the difference between NULL, '\0' and 0?
In C, there appear to be differences between various values of zero -- NULL , NUL and 0 .
11 Answers
...
Fragment lifecycle - which method is called upon show / hide?
...
Similar to activity lifecycle, Android calls onStart() when fragment becomes visible. onStop() is normally called when fragment becomes invisible, but it can also be called later in time.
Depending on your layout Android can call onStart() even,...
How to debug a GLSL shader?
...ally distinctive to the screen. For example you can paint something a specific color only if you reach the point of your code where you want add a printf. If you need to printf a value you can set the color according to that value.
...
How to determine if a record is just created or updated in after_save
The #new_record? function determines if a record has been saved. But it is always false in the after_save hook. Is there a way to determine whether the record is a newly created record or an old one from update?
...
Check if passed argument is file or directory in Bash
... pass it either a filename or a directory, and be able to do something specific when it's a file, and something else when it's a directory. The problem I'm having is when the directory name, or probably files too, has spaces or other escapable characters are in the name.
...
PHP + MySQL transactions examples
... transaction
$db->beginTransaction();
// A set of queries; if one fails, an exception should be thrown
$db->query('first query');
$db->query('second query');
$db->query('third query');
// If we arrive here, it means that no exception was thrown
// i....
How do I use the ternary operator ( ? : ) in PHP as a shorthand for “if / else”?
...
The
(condition) ? /* value to return if condition is true */
: /* value to return if condition is false */ ;
syntax is not a "shorthand if" operator (the ? is called the conditional operator) because you cannot execute code in the same manner as i...
Parse v. TryParse
What is the difference between Parse() and TryParse()?
8 Answers
8
...
How to get the last value of an ArrayList
...st implements):
E e = list.get(list.size() - 1);
E is the element type. If the list is empty, get throws an IndexOutOfBoundsException. You can find the whole API documentation here.
share
|
impro...
How can I delete a query string parameter in JavaScript?
... parameter ‘bar’ would match:
?a=b&foobar=c
Also, it would fail if parameter contained any characters that are special in RegExp, such as ‘.’. And it's not a global regex, so it would only remove one instance of the parameter.
I wouldn't use a simple RegExp for this, I'd parse the pa...