[英]How to write stored procedure passing select statement as input parameter?
I have a stored procedure that outputs a select statement as you see below: 我有一个存储过程,输出一个选择语句,如下所示:
select case when count(*) > 10 then ''A1'' else ''B1'' end as id, name, address from database.dbo.student
Now I want to write a stored procedure that takes such a select
statement as string input, and return all the above outputs. 现在,我想编写一个存储过程,将一个
select
语句作为字符串输入,并返回所有上述输出。 I'm not sure where to assign the output variables. 我不确定在哪里分配输出变量。
ALTER PROCEDURE dbo.selectAttributes
@select_statement Nvarchar(MAX),
@id Nvarchar(255) OUT,
@name nvarchar(255) OUT,
@address nvarchar(255) OUT
AS
BEGIN
DECLARE @query nvarchar(MAX)
SET @query = @select_statement
EXEC sp_executesql @query,
N'@select_statement Nvarchar(MAX),
@idOUT Nvarchar(255) OUTPUT,
@nameOUT nvarchar(255) OUTPUT,
@addressOUT nvarchar(255) OUTPUT',
@select_statement, @id OUTPUT, @name OUTPUT, @address OUTPUT
END
I think you are close: 我认为您很亲密:
ALTER PROCEDURE dbo.selectAttributes (
@select_statement Nvarchar(MAX),
@id Nvarchar(255) OUTPUT,
@name nvarchar(255) OUTPUT,
@address nvarchar(255) OUTPUT
) AS
BEGIN
EXEC sp_executesql @select_statement,
N'@id Nvarchar(255) OUTPUT, @name nvarchar(255) OUTPUT, @address nvarchar(255) OUTPUT',
@id = @id OUTPUT,
@name = @name OUTPUT,
@address = @address OUTPUT
END;
In other words: 换一种说法:
OUTPUT
keyword everywhere. OUTPUT
关键字放在任何地方。
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