存储过程和用户​​定义函数之间的区别 [英] Difference between stored procedures and user defined functions

问题描述

任何人都可以解释存储过程和用户​​定义函数之间的确切区别，以及在哪些上下文中有用的是什么。

Can anyone please explain what is the exact difference between stored procedures and user defined functions and in which context what is useful?

推荐答案

p>这是我总是记住：）

This is what i always keep in mind :)

• 过程可以返回零或n值，而函数可以返回一个必须的值


• 过程可以有输入/输出参数，而函数只能有输入参数。


• 过程允许select和DML语句


• 函数可以从过程调用，而不能从函数调用过程。


• 异常可以通过try / catch块在一个过程中，而try-catch块不能在函数中使用。


• 我们可以在过程中进行事务管理，而我们不能进入函数。 >
  
• 程序不能在select语句中使用，而函数可以嵌入到select语句中。


• UDF可以在WHERE / HAVING / SELECT section where as存储过程不能。


• 返回表的UDF可以被视为另一个行集。


• 内联UDF可以是带有参数的视图，可以在JOIN和其他Rowset操作中使用。

• Procedure can return zero or n values whereas function can return one value which is mandatory.
• Procedures can have input/output parameters for it whereas functions can have only input parameters.
• Procedure allows select as well as DML statement in it whereas function allows only select statement in it.
• Functions can be called from procedure whereas procedures cannot be called from function.
• Exception can be handled by try-catch block in a procedure whereas try-catch block cannot be used in a function.
• We can go for transaction management in procedure whereas we can't go in function.
• Procedures can not be utilized in a select statement whereas function can be embedded in a select statement.
• UDF can be used in the SQL statements anywhere in the WHERE/HAVING/SELECT section where as Stored procedures cannot be.
• UDFs that return tables can be treated as another rowset. This can be used in JOINs with other tables.
• Inline UDF's can be though of as views that take parameters and can be used in JOINs and other Rowset operations.

源 http://www.codeproject.com/Tips/286539/Difference-between-stored-procedure-and-function

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