大约有 3,551 项符合查询结果（耗时：0.0319秒） [XML]
GROUP_CONCAT ORDER BY
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@aleroot, Is this query MySQL specific?
– Pacerier
Apr 30 '15 at 20:24
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mysqli or PDO - what are the pros and cons? [closed]
In our place we're split between using mysqli and PDO for stuff like prepared statements and transaction support. Some projects use one, some the other. There is little realistic likelihood of us ever moving to another RDBMS.
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What's the difference between session.Merge and session.SaveOrUpdate?
...class);
configuration.setProperty("connection.driver_class","com.mysql.jdbc.Driver");
configuration.setProperty("hibernate.connection.url", "jdbc:mysql://localhost:3306/hibernate");
configuration.setProperty("hibernate.connection.username", "ro...
When is it appropriate to use C# partial classes?
...and-written code that belong in the same class.
For example since LINQ to SQL uses partial classes you can write your own implementation of certain pieces of functionality (like Many-to-Many relationships) and those pieces of custom code won't get overwritten when you re-generate the code.
The sam...
How do you kill a Thread in Java?
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I use method getConnection() from java.sql.DriverManager. If the connection attemt takes too long I try to kill the corresponding thread by calling Thread.interrupt() but it doesn't influence the thread at all. The Thread.stop() works however, although oracle says...
What is default session timeout in ASP.NET?
...ry/h6bb9cz9(v=vs.80).aspx
<sessionState
mode="[Off|InProc|StateServer|SQLServer|Custom]"
timeout="number of minutes"
cookieName="session identifier cookie name"
cookieless=
"[true|false|AutoDetect|UseCookies|UseUri|UseDeviceProfile]"
regenerateExpiredSessionId="[True|False]"
sqlConnectionS...
Go: panic: runtime error: invalid memory address or nil pointer dereference
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for me one solution for this problem was to add in sql.Open ... sslmode=disable
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Why is debugging better in an IDE? [closed]
...e been a software developer for over twenty years, programming in C, Perl, SQL, Java, PHP, JavaScript, and recently Python. I've never had a problem I could not debug using some careful thought, and well-placed debugging print statements.
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Generating a random & unique 8 character string using MySQL
I'm working on a game which involves vehicles at some point. I have a MySQL table named "vehicles" containing the data about the vehicles, including the column "plate" which stores the License Plates for the vehicles.
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MySQL remove all whitespaces from the entire column
...DATE `table` SET `col_name` = REPLACE(`col_name`, '\n', '')
http://dev.mysql.com/doc/refman/5.0/en/string-functions.html#function_replace
To remove first and last space(s) of column :
UPDATE `table` SET `col_name` = TRIM(`col_name`)
http://dev.mysql.com/doc/refman/5.0/en/string-functions.html#...