大约有 36,010 项符合查询结果（耗时：0.0269秒） [XML]
Retain cycle on `self` with blocks
...
Strictly speaking, the fact that it's a const copy has nothing to do with this problem. Blocks will retain any obj-c values that are captured when they are created. It just so happens that the workaround for the const-copy issue is identical to the workaround for the retain issue; namely, u...
How do you validate a URL with a regular expression in Python?
...e it, and look at the pieces to see if they're displeasing in some way.
Do you want the scheme to always be "http"? Do you want the netloc to always be "www.somename.somedomain"? Do you want the path to look unix-like? Or windows-like? Do you want to remove the query string? Or preserve it?
...
What's the best way to iterate an Android Cursor?
...tly see code which involves iterating over the result of a database query, doing something with each row, and then moving on to the next row. Typical examples are as follows.
...
git add, commit and push commands in one?
...
Restart not needed, just do "source .bashrc"
– Sambit Tripathy
May 14 '15 at 19:09
26
...
Meteor test driven development [closed]
I don't see how to do test driven development in meteor.
13 Answers
13
...
When to use std::size_t?
...
@EntangledLoops ssize_t does not have the full range of size_t. It just is the signed variant of whatever size_t would translate into. This means, that the full range of the memory is not usable with ssize_t and integer overflows could happen when d...
Make an existing Git branch track a remote branch?
I know how to make a new branch that tracks remote branches, but how do I make an existing branch track a remote branch?
2...
How do I check in JavaScript if a value exists at a certain array index?
...because of JavaScript's comparison rules, my last example can be optimised down to this:
if (array[index] != null) {
// The == and != operators consider null equal to only null or undefined
}
share
|
...
The mysql extension is deprecated and will be removed in the future: use mysqli or PDO instead [dupl
...s, there are two other MySQL extensions that you can consider: MySQLi and PDO_MySQL, either of which can be used instead of ext/mysql. Both have been in PHP core since v5.0, so if you're using a version that is throwing these deprecation errors then you can almost certainly just start using them ri...
How do I add a foreign key to an existing SQLite table?
...FOREIGN KEY (parent_id)
REFERENCES parent(id);
SQLite doesn't support the ADD CONSTRAINT variant of the ALTER TABLE command (sqlite.org: SQL Features That SQLite Does Not Implement).
Therefore, the only way to add a foreign key in sqlite 3.6.1 is during CREATE TABLE as follows...