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MongoDB inserts float when trying to insert integer
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db.data.update({'name': 'zero'}, {'$set': {'value': NumberInt(0)}})
You can also use NumberLong.
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正则表达式 30 分钟入门教程 - 更多技术 - 清泛网 - 专注C/C++及内核技术
正则表达式 30 分钟入门教程来园子之前写的一篇正则表达式教程，部分翻译自codeproject的The 30 Minute Regex Tutorial。由于评论里有过长的URL,所以本页排版比较...
来园子之前写的一篇正则表达式教程，部分翻译自codeproject的The 30...
How can I make gdb save the command history?
...t answer: echo 'set history save on' >> ~/.gdbinit && chmod 600 ~/.gdbinit
Long answer:
Command history is covered in the GDB manual, 22.3 Command History. Create a file $HOME/.gdbinit, change its permissions to 0600, and add the following content:
set history save on
You can se...
How to get unique values in an array
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Since I went on about it in the comments for @Rocket's answer, I may as well provide an example ...
What replaces cellpadding, cellspacing, valign, and align in HTML5 tables?
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/* cellpadding */
th, td { padding: 5px; }
/* cellspacing */
table { border-collapse: separate...
C#: how to get first char of a string?
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Just MyString[0]. This uses the String.Chars indexer.
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What is the proper way to check if a string is empty in Perl?
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answered Jan 11 '10 at 23:20
Greg HewgillGreg Hewgill
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how to customize `show processlist` in mysql?
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answered May 30 '09 at 12:09
AndomarAndomar
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Does List guarantee insertion order?
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edited Dec 20 '17 at 13:22
UuDdLrLrSs
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html5 - canvas element - Multiple layers
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<div style="position: relative;">
<canvas id="layer1" width="100" height="100"
style="position: absolute; left: 0; top: 0; z-index: 0;"></canvas>
<canvas id="layer2" width="100" height="100"
style="position: absolute; left: 0; top: 0; z-index: 1;"></canvas>...