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difference between primary key and unique key
... there are so many physical entities (such as people, resources, machines, etc.) and virtual entities (their Tasks, transactions, activities).
Typically, business needs to record and process information of those business entities.
These business entities are identified within a whole business doma...
How do you manage databases in development, test, and production?
...elopment, and a maintenance branch for bug fixes, short term enhancements, etc. Inevitably, the need arose to make changes to the schema in the branch. At this point, we already had dbChanges_n+1.sql in the Trunk, so we ended up going with a scheme like the following:
dbChanges_n.1.sql
dbChanges_n...
Why doesn't django's model.save() call full_clean()?
...orms with excluded fields, models with default values, pre_save() signals, etc.
Sources you might be intrested in:
http://code.djangoproject.com/ticket/13100
http://groups.google.com/group/django-developers/browse_frm/thread/b888734b05878f87
...
How do I reference a javascript object property with a hyphen in it?
Using this script to make a style object of all the inherited etc styles.
11 Answers
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NSNotificationCenter addObserver in Swift
...velDidChange, .UIApplicationDidFinishLaunching, .UITextFieldTextDidChange, etc.
You can extend Notification.Name with your own custom notifications in order to stay consistent with the system notifications:
// Definition:
extension Notification.Name {
static let yourCustomNotificationName = No...
Number of processors/cores in command line
...
The most simplest tool comes with glibc and is called getconf:
$ getconf _NPROCESSORS_ONLN
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Regular expression to allow spaces between words
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Nice Regex, much simpler then a lot of [0-9a-z] etc
– George
Jul 6 '16 at 1:16
I found in m...
Windows应用程序异常：异常代码: 0xc0000005 - C/C++ - 清泛网 - 专注C/C++及内核技术
...溃，没有留下任何痕迹，追踪困难。这时可以打开Windows的应用程序日志，查看崩溃信息。操作方法，我的电脑右键管理：错 有时应用程序异常崩溃，没有留下任何痕迹，追踪困难。这时可以打开Windows的应用程序日志，查看崩...
stl 字符串std::string作为std::map主键key的实例 - C/C++ - 清泛网 - 专注C/C++及内核技术
stl 字符串std::string作为std::map主键key的实例本文通过一个实例介绍std::map字符串作为key的常见用法，并使用find_if实现map按value值查找。代码如下：
#include <map>
#include <string>
#include <algorithm>
using namespace std;
class map_value_finder
{...
js页面跳转window.location.href很多浏览器不支持的解决方法 - C/C++ - 清...
js页面跳转window.location.href很多浏览器不支持的解决方法在js里用window.location.href（"xxxxx"）;来实现页面直接跳转功能。如：window.location.href(" index.html");IE内核浏览器木有问题。火狐...在js里用window.location.href（"xxxxx"）;来实现页面直...