大约有 32,293 项符合查询结果（耗时：0.0607秒） [XML]
What is the “N+1 selects problem” in ORM (Object-Relational Mapping)?
...ntages to single select is that you get all the data up front which may be what you ultimately desire. The advantages to N+1 is query complexity is reduced and you can use lazy loading where the child result sets are only loaded upon first request.
...
Best practice for creating millions of small temporary objects
What are the "best practices" for creating (and releasing) millions of small objects?
13 Answers
...
How to clone all remote branches in Git?
...nch 'experimental'
That last line throws some people: "New branch" - huh?
What it really means is that the branch is taken from the index and created locally for you. The previous line is actually more informative as it tells you that the branch is being set up to track the remote branch, which us...
ES6 class variable alternatives
...same attributes as if they appeared in an object literal.
This means that what you're asking for was considered, and explicitly decided against.
but... why?
Good question. The good people of TC39 want class declarations to declare and define the capabilities of a class. Not its members. An ES6 clas...
How to force an entire layout View refresh?
...
Thanks ! This runs okay, but I do not see what I expected. Just before running your code I run Activity.setTheme(newtheme) but this invalidate() call does not cause the theme to change (e.g. from Dark to Light). Should invalidate() be able to do that ?
...
Is recursion ever faster than looping?
...ng.
In short, the answer depends on the code and the implementation. Use whatever style you prefer. If you're using a functional language, recursion might be faster. If you're using an imperative language, iteration is probably faster. In some environments, both methods will result in the same ...
Setup a Git server with msysgit on Windows [closed]
...
For the record, from what I can tell, at point 5.5 in Tim's instructions, you need to insert the extra command BEFORE the #, not after (otherwise it remains commented out).
– Benjol
May 4 '10 at 12:21
...
What is the difference between isinstance('aaa', basestring) and isinstance('aaa', str)?
...
Really what you're asking is the difference between the basestring and str class.
Str is a class that inherits from basestr. But unicode strings also exist, as could other ones, if you wanted to make one.
>>> a = u'aaaa'...
What is the purpose of static keyword in array parameter of function like “char s[static 10]”?
...
That link appears to have rotten away, is this what it was pointing to? pic.dhe.ibm.com/infocenter/zos/v1r12/…
– Ross Aiken
Oct 24 '13 at 17:44
13
...
Timing a command's execution in PowerShell
...cess to, like $t.Milliseconds, $t.TotalSeconds, etc. Then we can write to whatever output we want, for instance, Write-Host That command took $t.TotalSeconds to complete.
– Baodad
Jan 21 '14 at 19:49
...