大约有 48,000 项符合查询结果（耗时：0.0408秒） [XML]
Select distinct values from a table field
...els.CharField(max_length=150)
# some of your models may have explicit ordering
class Meta:
ordering = ('city')
Since you may have the Meta class ordering attribute set, you can use order_by() without parameters to clear any ordering when using distinct(). See the documentation und...
What does SynchronizationContext do?
...t be executed normally, without passing it to a SynchronizationContext. In order to decide that, you must know the rules and requirements of the framework you're programming against — Windows Forms in this case.
So remember this simple rule for Windows Forms: DO NOT access controls or forms from a...
When to use extern in C++
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How to get last N records with activerecord?
...method:
Record.last(N)
Example:
User.last(5)
Returns 5 users in descending order by their id.
Deprecated (Old Answer)
An active record query like this I think would get you what you want ('Something' is the model name):
Something.find(:all, :order => "id desc", :limit => 5).reverse
edit: As n...
Position of least significant bit that is set
... i++) {
unsigned int value = nums[i];
// note that order to check indices will depend whether you are on a big
// or little endian machine. This is for little-endian
unsigned char *bytes = (unsigned char *)&value;
if (bytes[0])
...
Clear the cache in JavaScript
...eshs[j] + 'k=' + key );
scripts[i].src = new_src; // change src in order to refresh js
}
}
}
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How to assign from a function which returns more than one value?
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edited the question in order to include your remarks. thanks. giving names to things like r[1] can help to make things more clear (all right, not if names like a come in their place).
– mariotomo
Dec 1 '09 at...
SET versus SELECT when assigning variables?
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+1 It is better to run once in order to understand, check, play, memorize that to just read but other answers are just text
– Gennady Vanin Геннадий Ванин
Oct 16 '10 at 7:36
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Yellow fade effect with JQuery
... comments, effects.core.js and effects.highlight.js need to be included in order to use this.
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Is there a way to suppress warnings in Xcode?
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In order to surpress a warning for an individual file do the following:
select the file in the xcode project.
press get info
go to the page with build options
enter -Wno- to negate a warning:
-Wno-
e.g.
-Wno-unused-pa...