如何将输出参数传递给存储过程？

Question

我用以下格式编写了一个存储过程:

ALTER PROCEDURE usp_data_migration 
   (@sourceDatabase varchar(50),
    @sourceTable varchar(50),
    @targetDatabase varchar(50),
    @targetTable varchar(50),
    @finaloutput varchar(max) output)
AS
BEGIN
----Set of SQL Blocks


END

然后,我正在执行程序:

DECLARE @finaloutput1 varchar(300)

EXEC usp_data_migration 'Yousuf', 'emp', '[City Branch]', 'emp_tgt', @finaloutput1 output 

SELECT @finaloutput1 

通过这种方式执行我没有正确的输出.

当我执行这种方式时:

DECLARE @finaloutput1 varchar(300)

EXEC usp_data_migration @sourceDatabase = 'Yousuf',
                        @sourceTable = 'emp',
                        @targetDatabase = '[City Branch]',
                        @targetTable = 'emp_tgt',
                        @finaloutput1 output 

SELECT @finaloutput1 

我收到一条错误消息:

消息119,级别15,状态1,行41
必须将参数编号5和后续参数作为"@name = value"传递.在使用"@name = value"形式之后,必须以"@name = value"形式传递所有后续参数.

如果我删除了输出参数并执行了该过程,我得到了我想要的输出但是我无法将结果作为输出.

EXEC usp_data_migration @sourceDatabase = 'Yousuf',
                        @sourceTable = 'emp',
                        @targetDatabase = '[City Branch]',
                        @targetTable = 'emp_tgt'

我该怎么办？

提前致谢.

Answer 1

错误消息不言自明 - 您应该为所有参数命名.

DECLARE @finaloutput1 varchar(300);

EXEC dbo.usp_data_migration -- always use schema prefix
  @sourceDatabase = 'Yousuf',
  @sourceTable = 'emp',
  @targetDatabase = '[City Branch]',
  @targetTable = 'emp_tgt',
  @finaloutput = @finaloutput1 OUTPUT;

SELECT @finaloutput1;

Answer 2

你必须像这样选择

例1

  create procedure p1
    (
    @id INT,
    @name varchar(20) OUTPUT,
    @company varchar(20) OUTPUT
    )
    AS
     BEGIN
    Set @name = 'name'
    Set @company = 'company'
        select @name , @company from table1 where id = @id;
     END
    GO

例2

CREATE PROCEDURE Myproc
    @parm varchar(10),
    @parm1OUT varchar(30) OUTPUT,
    @parm2OUT varchar(30) OUTPUT
    AS
      SELECT @parm1OUT='parm 1' + @parm
     SELECT @parm2OUT='parm 2' + @parm
GO
DECLARE @SQLString NVARCHAR(500)
DECLARE @ParmDefinition NVARCHAR(500)
DECLARE @parmIN VARCHAR(10)
DECLARE @parmRET1 VARCHAR(30)
DECLARE @parmRET2 VARCHAR(30)
SET @parmIN=' returned'
SET @SQLString=N'EXEC Myproc @parm,
                             @parm1OUT OUTPUT, @parm2OUT OUTPUT'
SET @ParmDefinition=N'@parm varchar(10),
                      @parm1OUT varchar(30) OUTPUT,
                      @parm2OUT varchar(30) OUTPUT'

EXECUTE sp_executesql
    @SQLString,
    @ParmDefinition,
    @parm=@parmIN,
    @parm1OUT=@parmRET1 OUTPUT,@parm2OUT=@parmRET2 OUTPUT

SELECT @parmRET1 AS "parameter 1", @parmRET2 AS "parameter 2"
go
drop procedure Myproc

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