大约有 15,600 项符合查询结果（耗时：0.0274秒） [XML]
How to define two fields “unique” as couple
...
I would say you'll get a "ValidationError" exception. Have a look at the Django docs: Model.validate_unique
– Jens
Apr 10 '10 at 15:09
2
...
Git push rejected after feature branch rebase
...hat case), but as git push performs only fast-forward merges it throws and error.
And what --force option does is just ignoring state of remote branch and setting it to the commit you're pushing into it. So git push --force origin feature-branch simply overrides origin/feature-branch with local fea...
Does Swift support reflection?
...ensive applications, but without the complexity, learning curve or risk of error associated with C++
While Swift is a compiled language, the messaging style of method invocation adds the introspection and dynamism found in modern languages like Ruby and Python, just like Objective-C, but without Obj...
What's wrong with using == to compare floats in Java?
...atically equivalent computations is risky. This is because of the rounding errors and loss of precision when converting from decimal to binary representation. This has been discussed to death on SO.
[*] When I said "standard-compliant JVM" I wanted to exclude certain brain-damaged JVM implementati...
How to determine function name from inside a function
...unction is executing. Assignments to FUNCNAME have no effect and return an error status. If FUNCNAME is unset, it loses its special properties, even if it is subsequently reset.
This variable can be used with BASH_LINENO and BASH_SOURCE. Each element of FUNCNAME has corresponding elements in BASH_LI...
Rails: convert UTC DateTime to another time zone
... In irb, when I try Time.now.in_time_zone('CST'), I get the error "undefined method 'in_time_zone'". Are there rails classes that I need in order to get this to work?
– Drew Johnson
Apr 23 '10 at 2:59
...
LD_LIBRARY_PATH vs LIBRARY_PATH
...
Since I link with gcc why ld is being called, as the error message suggests?
gcc calls ld internally when it is in linking mode.
share
|
improve this answer
|
...
Example for boost shared_mutex (multiple reads/one write)?
...
I'm trying to use this myself but I'm getting an error. missing template arguments before 'lock'. Any ideas?
– Matt
Aug 18 '10 at 2:56
2
...
Only one expression can be specified in the select list when the subquery is not introduced with EXI
...
It doesn't helped me. Gives me the same error. Specifying the column instead of * helped me.
– Mohammedsalim Shivani
Sep 3 '18 at 15:47
...
Why does integer division in C# return an integer and not a float?
...
If you do the following:
int x = 13f / 4f;
You'll receive a compiler error, since a floating-point division (the / operator of 13f) results in a float, which cannot be cast to int implicitly.
If you want the division to be a floating-point division, you'll have to make the result a float:
fl...