大约有 40,000 项符合查询结果（耗时：0.0389秒） [XML]
Rails create or update magic?
...ils - you have to separate it into two Ruby statements, one for the object selection and one for the attribute update.
– sameers
Sep 23 '14 at 5:08
...
Understanding the difference between Object.create() and new SomeFunction()
...y when you create a object by using 'Object.create',you get the ability to select the object that should be its prototype.
– Anshul
Sep 2 '14 at 18:52
...
How to change time and timezone in iPhone simulator?
...tiple different time zones: add a TZ setting for each one, but remember to select only one at a time. I just added America/Chicago, Europe/Istanbul, Asia/Hong_Kong, and Pacific/Honolulu to get an assortment so I can track down a timezone-dependent bug. This will NOT work if you need to capture scree...
How to prevent SIGPIPEs (or handle them properly)
...? Is there a way to check if the other side of the line is still reading? (select() doesn't seem to work here as it always says the socket is writable). Or should I just catch the SIGPIPE with a handler and ignore it?
...
What is the difference between mutex and critical section?
...
The 'fast' Windows equal of critical selection in Linux would be a futex, which stands for fast user space mutex. The difference between a futex and a mutex is that with a futex, the kernel only becomes involved when arbitration is required, so you save the over...
How does “cat
...1. Assign multi-line string to a shell variable
$ sql=$(cat <<EOF
SELECT foo, bar FROM db
WHERE foo='baz'
EOF
)
The $sql variable now holds the new-line characters too. You can verify with echo -e "$sql".
2. Pass multi-line string to a file in Bash
$ cat <<EOF > print.sh
#!/bin...
How can I extract a good quality JPEG image from a video file with ffmpeg?
...be console output can tell you if your input is MJPEG:
$ ffprobe -v error -select_streams v:0 -show_entries stream=codec_name -of default=nw=1 input.avi
codec_name=mjpeg
Then you can extract the frames using the mjpeg2jpeg bitstream filter:
$ ffmpeg -i input.avi -codec:v copy -bsf:v mjpeg2jpeg outp...
Launching Google Maps Directions via an intent on Android
...o set the default transit mode in the intent. By default the car option is selected. Can I set Walking as the default mode?
– Bear
Jan 7 '13 at 17:32
6
...
find all unchecked checkbox in jquery
...
As the error message states, jQuery does not include a :unchecked selector.
Instead, you need to invert the :checked selector:
$("input:checkbox:not(:checked)")
share
|
improve this answe...
How to fix the Hibernate “object references an unsaved transient instance - save the transient insta
...
For merge, it runs a SELECT query. Otherwise, it checks the id and the version.
– Vlad Mihalcea
Sep 4 at 3:46
add a comme...