大约有 1,888 项符合查询结果（耗时：0.0216秒） [XML]
What is the difference between an ORM and an ODM?
... ODM, as far as I understand the concept, ORM (Object Relational Mapper) maps the relations between data, where as ODM (Object Document Mapper) deals with documents. Am I right in assuming that mySQL is an example of ORM and MongoDB is a example of ODM?
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How does a Linux/Unix Bash script know its own PID?
...ess. It might be a bit ugly, but it works. Example:
sleep 1 &
mypid=$(ps -o ppid= -p "$!")
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Revert the `--no-site-packages` option with virtualenv
... include-system-site-packages = false Change this value and call Activate.ps1
– georgik
May 24 '15 at 12:12
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Nohup is not writing log to output file
... > cmd.log &
or
nohup python -u ./cmd.py > cmd.log &
https://docs.python.org/2/using/cmdline.html#cmdoption-u
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Is it possible to delete an object's property in PHP?
...se, unset($object['literal_key']) and unset($object->{'literal_key'})). PS Hm, I may be wrong, though, in thinking the thing I'm editing is an object, not an array
– YakovL
Jan 5 '19 at 13:28
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Why is $$ returning the same id as the parent process?
...was ***
dd if=/dev/diskx of=/dev/disky
Then you would use:
PIDs=$(ps | grep dd | grep if | cut -b 1-5)
What happens here is it pipes all needed unique characters to a field and that field can be echoed using
echo $PIDs
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Difference between Label and TextBlock
...ight than Label and better suited for simpler, noninteractive scenarios.
PS: However, if you want access keys to work or want a more flexible or graphical design, you’ll need to use Label.
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Using HeapDumpOnOutOfMemoryError parameter for heap dump for JBoss
...ith the -XX:HeapDumpPath= option. For
example -XX:HeapDumpPath=/disk2/dumps
will cause the heap dump to be
generated in the /disk2/dumps
directory.
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Reference alias (calculated in SELECT) in WHERE clause
...tly to calculate) you should probably consider a computed column (and perhaps persisted) instead, especially if a lot of queries refer to this same expression.
PS your fears seem unfounded. In this simple example at least, SQL Server is smart enough to only perform the calculation once, even though...
Fast way to get image dimensions (not filesize)
...y handy
php -r "print_r(getimagesize('http://www.google.com/images/logos/ps_logo2.png'));"
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