大约有 30,300 项符合查询结果（耗时：0.0389秒） [XML]
Select DISTINCT individual columns in django?
...te in the docs about using distinct(). The above example will work but all combinations of distinct() and values() may not.
PS: it is a good idea to use lower case names for fields in a model. In your case this would mean rewriting your model as shown below:
class ProductOrder(models.Model):
...
Multiline syntax for piping a heredoc; is this portable?
...ncludes these definitions:
pipe_sequence : command
| pipe_sequence '|' linebreak command
newline_list : NEWLINE
| newline_list NEWLINE
;
linebreak : newline_list
| /* empty */...
Set Viewbag before Redirect
...
I would like to complete the answer because I am using it and I faced a small problem that is when the TempData is empty for some reason (in my case I only have a message when a conversion is made). So I had to had the test if(TempData["Mess...
Timertask or Handler
...ated tasks on background threads. However, the literature overwhelmingly recommends using Handler over TimerTask in Android (see here, here, here, here, here, and here).
Some of reported problems with TimerTask include:
Can't update the UI thread
Memory leaks
Unreliable (doesn't always work)
Lon...
Do event handlers stop garbage collection from occurring?
...
add a comment
|
9
...
How can I make Visual Studio's build be very verbose?
...++ → General
Change the setting for Suppress Startup Banner to No
The cl command line(s) will be shown in the output window.
share
|
improve this answer
|
follow
...
Viewing all `git diffs` with vimdiff
...onyamo Setting alias should be always based on how often we are using some commands. I am often using git diff than git difftool. So I have aliased d to 'diff' and 'dt' to difftool'. Usability is matter than creating aliases with pattern.
– Habeeb Perwad
Jan 8 ...
Setting a timeout for socket operations
...
add a comment
|
43
...
List of encodings that Node.js supports
...
For those having problems compiling iconv I recommend iconv-lite. It does not require compilation and according to the dev is faster than iconv and it is used by popular tools like Grunt, Nodemailer, Yeoman, ...
– Telémako
...
Is effective C++ still effective?
...alls short in its support for C++0x, the errors are those of omission, not commission.
UPDATE: the new title Effective Modern C++ has been for sale since November 2014 from O'Reilly and Amazon (and many others that you can google for).
...