大约有 40,000 项符合查询结果（耗时：0.0280秒） [XML]
SQLAlchemy: cascade delete
... This is well explained in the current doc docs.sqlalchemy.org/en/rel_0_9/orm/cascades.html
– Epoc
Feb 28 '15 at 19:47
1
...
What's the difference between deque and list STL containers?
...that a horse works like a dog because they both implement attack() and make_noise().
share
|
improve this answer
|
follow
|
...
#1071 - Specified key was too long; max key length is 1000 bytes
...per column as you define the index. For example:
...
KEY `index` (`parent_menu_id`,`menu_link`(50),`plugin`(50),`alias`(50))
...
But what's the best prefix length for a given column? Here's a method to find out:
SELECT
ROUND(SUM(LENGTH(`menu_link`)<10)*100/COUNT(`menu_link`),2) AS pct_leng...
How to check if a file exists in Documents folder?
... Or just [0] via index accessing
– temporary_user_name
Dec 16 '14 at 0:09
firstObject is more safe than [0] a...
Automatically import modules when entering the python or ipython interpreter
...roduction scripts.
For Ipython, see this tutorial on how to make a ipython_config file
share
|
improve this answer
|
follow
|
...
Create subdomains on the fly with .htaccess (PHP)
...P
Then in your PHP scripts you can find out the domain by looking in the $_SERVER super global variable. Here is an example of grabbing the subdomain in PHP:
preg_match('/([^.]+)\.example\.org/', $_SERVER['SERVER_NAME'], $matches);
if(isset($matches[1])) {
$subdomain = $matches[1];
}
I have ...
Preferred method to store PHP arrays (json_encode vs serialize)
...() you need to add extra parameter to keep UTF-8 characters untouched: json_encode($array, JSON_UNESCAPED_UNICODE) (otherwise it converts UTF-8 characters to Unicode escape sequences).
JSON will have no memory of what the object's original class was (they are always restored as instances of stdClas...
Sleep for milliseconds
... facilities:
#include <chrono>
#include <thread>
std::this_thread::sleep_for(std::chrono::milliseconds(x));
Clear and readable, no more need to guess at what units the sleep() function takes.
share
...
How to loop backwards in python? [duplicate]
...
for x in reversed(whatever):
do_something()
This works on basically everything that has a defined order, including xrange objects and lists.
share
|
imp...
How do you split a list into evenly sized chunks?
...
@Nhoj_Gonk Oops it's not an infinite loop, but chunks(L, 0) would raise a ValueError without the max(). Instead, the max() turns anything less than 1 into a 1.
– Bob Stein
Apr 27 at 9:58
...