执行动态sql返回参数

ref: https://support.microsoft.com/en-us/kb/262499

DECLARE @SQLString NVARCHAR(500)
DECLARE @ParmDefinition NVARCHAR(500)
DECLARE @IntVariable INT
DECLARE @Lastlname varchar(30)
SET @SQLString = N'SELECT @LastlnameOUT = max(lname)
                   FROM pubs.dbo.employee WHERE job_lvl = @level'
SET @ParmDefinition = N'@level tinyint,
                        @LastlnameOUT varchar(30) OUTPUT'
SET @IntVariable = 35
EXECUTE sp_executesql
    @SQLString,
    @ParmDefinition,
    @level = @IntVariable,
    @LastlnameOUT=@Lastlname OUTPUT
SELECT @Lastlname

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CREATE PROCEDURE Myproc
    @parm nvarchar(10),
    @parm1OUT nvarchar(30) OUTPUT,
    @parm2OUT nvarchar(30) OUTPUT
AS
    SELECT @parm1OUT=N'参数1parm 1' + @parm
    SELECT @parm2OUT=N'参数2parm 2' + @parm
GO

DECLARE @SQLString NVARCHAR(500)
DECLARE @ParmDefinition NVARCHAR(500)
DECLARE @parmIN nvarchar(10)
DECLARE @parmRET1 nvarchar(30)
DECLARE @parmRET2 nvarchar(30)
SET @parmIN=' returned'
SET @SQLString=N'EXEC Myproc @parm,
                             @parm1OUT OUTPUT, @parm2OUT OUTPUT'
SET @ParmDefinition=N'@parm nvarchar(10),
                      @parm1OUT nvarchar(30) OUTPUT,
                      @parm2OUT nvarchar(30) OUTPUT'
/*
EXECUTE sp_executesql
    @SQLString,
    @ParmDefinition,
    @parm1OUT=@parmRET1 OUTPUT,@parm2OUT=@parmRET2 OUTPUT,
    @parm=@parmIN  
*/
--可以不指定参数名，但位置要正确
EXECUTE sp_executesql
    @SQLString,
    @ParmDefinition,
    @parmIN,  @parmRET1 OUTPUT, @parmRET2 OUTPUT
SELECT @parmRET1 AS "parameter 1", @parmRET2 AS "parameter 2"
GO

drop procedure Myproc