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Foreign Key to non-primary key
... Related to your last question... I have a situation where I'd like composite candidate keys to be the primary key just because it semantically has more importance and describes my model best. I too would like to have a foreign key reference a newly created surrogate key for the sake of perf...
Make a div fill the height of the remaining screen space
...Note: Though CSS Flexible Boxes Layout specification is at the Candidate Recommendation stage, not all browsers have implemented it. WebKit implementation must be prefixed with -webkit-; Internet Explorer implements an old version of the spec, prefixed with -ms-; Opera 12.10 implements the latest ve...
Performing user authentication in Java EE / JSF using j_security_check
...ser authentication for a web application making use of JSF 2.0 (and if any components do exist) and Java EE 6 core mechanisms (login/check permissions/logouts) with user information hold in a JPA entity. The Oracle Java EE tutorial is a bit sparse on this (only handles servlets).
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Is it possible to select the last n items with nth-child?
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Is there any way to not return something using CoffeeScript?
...
Or:
fun = ->
doSomething()
undefined
This is what the doc recommends, when using comprehensions:
Be careful that you're not accidentally returning the results of the comprehension in these cases, by adding a meaningful return value — like true — or null, to the bottom of your ...
What does flushing the buffer mean?
...byte at a time, then each write of a byte is going to be very costly. So a common way to improve performance is to store the data that you are writing in a temporary buffer. Only when there is a lot of data is the buffer written to the file. By postponing the writes, and writing a large block in one...
How to use SCNetworkReachability in Swift
...Note also that registering a notifier callback is possible as of
Swift 2, compare Working with C APIs from Swift and Swift 2 - UnsafeMutablePointer<Void> to object.
Update for Swift 3/4:
Unsafe pointers cannot be simply be converted to a pointer of a
different type anymore (see - SE-0107...
常用Git命令汇总 - 开源 & Github - 清泛网 - 专注C/C++及内核技术
...obal user.name "xxxx" #用户名
git config --global user.email "xxxx@xxx.com" #邮箱
git config --global core.editor vim #编辑器
git config --global alias.st status #按这种方法，配置别名
git config -l #列举所有配置
Git中3种状态的一些操作
#将工作区的修改...