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Send and receive messages through NSNotificationCenter in Objective-C?
...
@implementation TestClass
- (void) dealloc
{
// If you don't remove yourself as an observer, the Notification Center
// will continue to try and send notification objects to the deallocated
// object.
[[NSNotificationCenter defaultCenter] removeO...
How to export table as CSV with headings on Postgresql?
...ived in though
– grahamrhay
Sep 23 '15 at 11:09
37
For v9.5, the command is now COPY products_273...
搭建高可用mongodb集群（一）——配置mongodb - 大数据 & AI - 清泛网 - 专...
...看是否成功。
> db.testdb.find();
{ "_id" : ObjectId("5284e5cb1f4eb215b2ecc463"), "test1" : "testval1" }
可以看到主机的同步日志
[initandlisten] connection accepted from 192.168.0.2:37285 #3 (2 connections now open)
[slaveTracking] update local.slaves query: { _id: ObjectId(&rs...
Is there a ceiling equivalent of // operator in Python?
...t shy of an order of magnitude faster than forcing the float division and calling ceil(), provided you care about the speed. Which you shouldn't, unless you've proven through usage that you need to.
>>> timeit.timeit("((5 - 1) // 4) + 1", number = 100000000)
1.7249219375662506
>>>...
How do I read from parameters.yml in a controller in symfony2?
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edited Oct 29 '15 at 11:16
Javier Eguiluz
3,33311 gold badge2020 silver badges3939 bronze badges
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querySelector and querySelectorAll vs getElementsByClassName and getElementById in JavaScript
...w what exactly is the difference between querySelector and querySelectorAll against getElementsByClassName and getElementById ?
...
Effects of changing Django's SECRET_KEY
...t know about 1.4, it's a matter of taking a look at the code. I pointed at all the sources for each point, you can take a look at "protect session data and create random session keys". It's normal you're still logged in but you won't be able to read the data contained in the session as SECRET_KEY is...
Database sharding vs partitioning
...databases. Sharding is one specific type of partitioning, part of what is called horizontal partitioning.
Here you replicate the schema across (typically) multiple instances or servers, using some kind of logic or identifier to know which instance or server to look for the data. An identifier of th...
How to check if a table contains an element in Lua?
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The Elemental of Creation
1151111 bronze badges
answered Sep 2 '13 at 9:15
JamesJames
2111 bronze badge
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Add Text on Image using PIL
...g, font=font);
– WeizhongTu
Jun 12 '15 at 3:25
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