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Mercurial for Beginners: The Definitive Practical Guide
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22 Answers
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Return 0 if field is null in MySQL
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332
Use IFNULL:
IFNULL(expr1, 0)
From the documentation:
If expr1 is not NULL, IFNULL() retur...
How to force keyboard with numbers in mobile website in Android
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answered Nov 30 '10 at 12:33
Richard KernahanRichard Kernahan
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How can I remove non-ASCII characters but leave periods and spaces using Python?
...ring. with funny characters'
string.printable on my machine contains:
0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ
!"#$%&\'()*+,-./:;<=>?@[\\]^_`{|}~ \t\n\r\x0b\x0c
EDIT: On Python 3, filter will return an iterable. The correct way to obtain a string back would be:
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ld cannot find an existing library
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edited Nov 8 '12 at 21:05
Yamaneko
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再说WCF Data Contract KnownTypeAttribute - 更多技术 - 清泛网移动版 - 专注C/C++及内核技术
...是指什么。
1). 序列化对象是从期望返回的类型继承；
2). 无法确定当前所使用类型的。例如Object类型，或者接口类型，你需要告诉序列化器去寻找确切的类来进行序列化。
3). 使用泛型类型作为期望返回类型的；
4). 使用像Arr...
Do I need to explicitly call the base virtual destructor?
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answered Mar 24 '09 at 14:23
Lou FrancoLou Franco
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How do I decode a base64 encoded string?
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