大约有 22,000 项符合查询结果（耗时：0.0336秒） [XML]
PostgreSQL “DESCRIBE TABLE”
...so on)
The SQL standard way, as shown here:
select column_name, data_type, character_maximum_length, column_default, is_nullable
from INFORMATION_SCHEMA.COLUMNS where table_name = '<name of table>';
It's supported by many db engines.
...
Get the first item from an iterable that matches a condition
...for x in the_iterable if x > 3), default_value)
Note that you need an extra pair of parentheses around the generator expression in this case − they are needed whenever the generator expression isn't the only argument.
I see most answers resolutely ignore the next built-in and so I assume tha...
How to unzip a file using the command line? [closed]
...zip
Complete set of options for the jar tool available here.
Examples:
Extract jar file
jar x[v]f jarfile [inputfiles] [-Joption]
jar x[v] [inputfiles] [-Joption]
share
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improve this ...
Should I always return IEnumerable instead of IList?
...ormation but once again, why would you throw away information? If you know extra information about something, pass it on.
– Mel
Oct 20 '11 at 12:13
...
CHECK constraint in MySQL is not working
...GER `test_before_insert` BEFORE INSERT ON `Test`
FOR EACH ROW
BEGIN
IF CHAR_LENGTH( NEW.ID ) < 4 THEN
SIGNAL SQLSTATE '12345'
SET MESSAGE_TEXT := 'check constraint on Test.ID failed';
END IF;
END$$
DELIMITER ;
Prior to MySQL 5.5 you had to cause an error, e.g. ca...
efficient circular buffer?
... return(self._data[key])
def __repr__(self):
"""Return string representation"""
return self._data.__repr__() + ' (' + str(len(self._data))+' items)'
[Edited]: Added optional data parameter to allow initialization from existing lists, e.g.:
circularlist(4, [1, 2, 3, 4, ...
List or IList [closed]
...interfaces really shine. Say I have a function that returns IEnumerable<string>, inside the function I may use a List<string> for an internal backing store to generate my collection, but I only want callers to enumerate it's contents, not add or remove. Accepting an interface as a parame...
How do I expand a tuple into variadic template function's arguments?
...{
typedef void (T::*F)( Args... args );
public:
Message( const std::string& name,
T& obj,
F pFunc,
Args... args );
private:
virtual void doDispatch( );
T* pObj_;
F pFunc_;
std::tr1::tuple<Args...> args_;
};
//----------------------...
Difference between framework vs Library vs IDE vs API vs SDK vs Toolkits? [closed]
... (software development kit) is a library or group of libraries (often with extra tool applications, data files and sample code) that aid you in developing code that uses a particular system (e.g. extension code for using features of an operating system (Windows SDK), drawing 3D graphics via a partic...
How to copy a row and insert in same table with a autoincrement field in MySQL?
...INFORMATION_SCHEMA ... I wonder if you could do it as a sub-query and some string functions? Hmmm...
– Yzmir Ramirez
Feb 6 '12 at 6:35
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