大约有 31,100 项符合查询结果（耗时：0.0561秒） [XML]
SQL WHERE.. IN clause multiple columns
...
@sleske: EXISTS is by far better: see my comments in my answer. And test it first,. @mrdenny: I misread your answer at first, I'd use EXISTS too
– gbn
Jul 16 '09 at 8:17
...
Using the scrollwheel in GNU screen
...d-Paste ), so I guess we're both right :-). Anyway, I added "copy mode" to my answer.
– sleske
Dec 9 '14 at 15:03
Grea...
Random record from MongoDB
...sample aggregation pipeline operator:
// Get one random document from the mycoll collection.
db.mycoll.aggregate([{ $sample: { size: 1 } }])
If you want to select the random document(s) from a filtered subset of the collection, prepend a $match stage to the pipeline:
// Get one random document m...
Python int to binary string?
...ency is important you'd probably not choose python to begin with. Still In my experience it happens quite often that code that was written naïvely using an O(N²) algo and tested with a small data set quickly gets used with a much larger data set because "it seems to work". Then all of a sudden you...
Override setter with arc
...
Yes. I realize this. I add comment where I want to add my additional code. Thank you very much for reply.
– rowwingman
Oct 29 '11 at 12:09
4
...
Running python script inside ipython
...
from within the directory of "my_script.py" you can simply do:
%run ./my_script.py
share
|
improve this answer
|
follow
...
Stop handler.postDelayed()
...uld also do like the following:
Handler handler = new Handler()
Runnable myRunnable = new Runnable() {
public void run() {
// do something
}
};
handler.postDelayed(myRunnable,zeit_dauer2);
Then:
handler.removeCallbacks(myRunnable);
Docs
public final void removeCallbacks (Runnable r)
...
“Java DateFormat is not threadsafe” what does this leads to?
... I don't see that that follows at all. I don't make most of my types thread-safe, so I don't expect their instance variables to be thread-safe either, necessarily. It's more reasonable to say that you shouldn't store a DateFormat in a static variable - or if you do, you'll need synchr...
What is the benefit of using $() instead of backticks in shell scripts?
...such warranties or fitness of purpose. I would instead reuse code on SO at my own risk, and vote contributions according to helpfulness, technical merits, etc.
– chrstphrchvz
Feb 11 '17 at 0:23
...
Delete all but the most recent X files in bash
...lanation for why it's generally not a good idea to parse ls output: http://mywiki.wooledge.org/ParsingLs
ls -tp | grep -v '/$' | tail -n +6 | xargs -I {} rm -- {}
The above is inefficient, because xargs has to invoke rm once for each filename.
Your platform's xargs may allow you to solve this pro...