Question

我有一个存储过程参数，我想使其可选并从表中指定默认值，我该怎么做？

ALTER PROCEDURE [DBO].[Test]

      @planId int = 1  ( This I can do )

但我想做

@planId int = ( Select Id from Table1 Where name = ‘ABC’) ‘ Assign default id from a table

Answer 1

如果你想这样做，最初只需要分配0，并在程序的第一行中将此值写入该变量。

ALTER PROCEDURE [DBO].[Test]
@planId int = 0
AS
BEGIN
SET @planId = ( Select Id from Table1 Where name = ‘ABC’)
...
...
...
END

Answer 2

在存储过程中，您可以声明并设置值。在这种情况下，您可以将@planId设置为您想要的任何内容：

CREATE PROCEDURE procedureName
    @planId int = null output
AS
    IF @planId = null
      Begin
      SET @planId = ( Select Id from Table1 Where name = ‘ABC’) 
      End
    ELSE --> then they gave you the value

存储过程可选参数默认值分配

2 个答案: