大约有 43,000 项符合查询结果（耗时：0.0422秒） [XML]
What is the most efficient/elegant way to parse a flat table into a tree?
...lution is called Nested Sets, and it can be stored in the same table too. Read "Trees and Hierarchies in SQL for Smarties" by Joe Celko for a lot more information on these designs.
I usually prefer a design called Closure Table (aka "Adjacency Relation") for storing tree-structured data. It requi...
Why should I learn Lisp? [closed]
...idn't say its only used for AI, I said one of its main uses is AI. Did you read it?
– Justin Bennett
Sep 18 '08 at 12:11
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PHP mkdir: Permission denied problem
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I know this is an old thread, but it needs a better answer. You shouldn't need to set the permissions to 777, that is a security problem as it gives read and write access to the world. It may be that your apache user does not have read/write permiss...
Total memory used by Python process?
...child) process usage.
If you care only about Linux, you can alternatively read the /proc/self/status or /proc/self/statm file as described in other answers for this question and this one too.
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Pythonic way to check if a file exists? [duplicate]
...en(fd, 'w')
This should open your file for writing if it doesn't exist already, and return a file-object. If it does exists, it will print "Ooops" and return None (untested, and based solely on reading the python documentation, so might not be 100% correct).
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What's the difference between Perl's backticks, system, and exec?
...d run simultaneously.
This can be accomplished with open.
It allows you to read STDOUT/STDERR and write to STDIN of your command.
It is platform dependent though.
There are also several modules which can ease this tasks.
There is IPC::Open2 and IPC::Open3 and IPC::Run, as well as
Win32::Process::Cr...
Which characters make a URL invalid?
...rcent-encoded as "%25" for that octet to be used as data within a URI." I read that as saying that a "%" may only appear if it is followed by two hex digits. How do you read it?
– Leif Wickland
Jan 5 '12 at 0:00
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Access to the path is denied
...You are opening the website to all kinds of vulnerabilities. You just want read/write permissions to the Images directory for the user/identity that is running the website (you will need to ask your host provider about that).
– Oded
Nov 21 '15 at 9:39
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Infinite Recursion with Jackson JSON and Hibernate JPA issue
...properties (during serialization), or ignore processing of JSON properties read (during deserialization). If this is not what you're looking for, please keep reading below.
(Thanks to As Zammel AlaaEddine for pointing this out).
JsonManagedReference and JsonBackReference
Since Jackson 1.6 you c...
Generating CSV file for Excel, how to have a newline inside a value
...rrectly, and row structure is not damaged, and all national characters are read properly (they were trashed when reading without UTF8 BOM). Excel have not even displayed the text-import wizard. Currently, that CSV now has EFBBBF header, uses 0A as row separator, and 0D0A as new line inside strings i...