大约有 47,000 项符合查询结果（耗时：0.0375秒） [XML]
Ruby on Rails: How do I add a not null constraint to an existing column using a migration?
In my Rails (3.2) app, I have a bunch of tables in my database but I forgot to add a few not null constraints. I've googled around but I can't find how to write a migration which adds not null to an existing column.
...
Can a for loop increment/decrement by more than one?
Are there other ways to increment a for loop in Javascript besides i++ and ++i ? For example, I want to increment by 3 instead of one.
...
Less aggressive compilation with CSS3 calc
The Less compilers that I'm using ( OrangeBits and dotless 1.3.0.5 ) are aggressively translating
4 Answers
...
C/C++ NaN constant (literal)?
Is this possible to assign a NaN to a double or float in C/C++? Like in JavaScript you do: a = NaN . So later you can check if the variable is a number or no.
...
Maven: how to override the dependency added by a library
...
5 Answers
5
Active
...
How to compare types
Quick question: how to compare a Type type (pun not intended) with another type in C#?
I mean, I've a Type typeField and I want to know if it is System.String , System.DateTime , etc., but typeField.Equals(System.String) doesn't work.
...
Count with IF condition in MySQL query
I have two tables, one is for news and the other one is for comments and I want to get the count of the comments whose status has been set as approved.
...
omp parallel vs. omp parallel for
What is the difference between these two?
6 Answers
6
...
Prevent automatic browser scroll on refresh
If you go to a page a and scroll around then refresh the page will refresh at the spot where you left it. This is great, however this also occurs on pages where there is a anchor location in the url. An example would be if you clicked on a link http://example.com/post/244#comment5 and refreshed th...
how to return index of a sorted list? [duplicate]
I need to sort a list and then return a list with the index of the sorted items in the list. For example, if the list I want to sort is [2,3,1,4,5] , I need [2,0,1,3,4] to be returned.
...