如何迭代存储过程中的记录集？ [英] How can I iterate over a recordset within a stored procedure?

问题描述

我需要从存储过程迭代一个记录集，并使用每个字段作为参数执行另一个存储过程。我无法在代码中完成此迭代。我在互联网上找到了样本，但它们似乎都在处理一个计数器。我不确定我的问题是否涉及柜台。我需要T-SQL等效于 foreach

I need to iterate over a recordset from a stored procedure and execute another stored procedure using each fields as arguments. I can't complete this iteration in the code. I have found samples on the internets, but they all seem to deal with a counter. I'm not sure if my problem involved a counter. I need the T-SQL equivalent of a foreach

目前，我的第一个存储过程将其记录集存储在临时表#mytemp中。我假设我会像这样调用辅助存储过程：

Currently, my first stored procedure stores its recordset in a temp table, #mytemp. I assume I will call the secondary stored procedure like this:

while (something)
    execute nameofstoredprocedure arg1, arg2, arg3
end

推荐答案

你需要创建一个光标循环遍历记录集。

You need to create a cursor to loop through the record set.

示例表：

CREATE TABLE Customers
(
    CustomerId INT NOT NULL PRIMARY KEY IDENTITY(1,1)
    ,FirstName Varchar(50) 
    ,LastName VARCHAR(40)
)

INSERT INTO Customers VALUES('jane', 'doe')
INSERT INTO Customers VALUES('bob', 'smith')

光标：

DECLARE @CustomerId INT, @FirstName VARCHAR(30), @LastName VARCHAR(50)

DECLARE @MessageOutput VARCHAR(100)

DECLARE Customer_Cursor CURSOR FOR 
    SELECT CustomerId, FirstName, LastName FROM Customers


OPEN Customer_Cursor 

FETCH NEXT FROM Customer_Cursor INTO
    @CustomerId, @FirstName, @LastName

WHILE @@FETCH_STATUS = 0
BEGIN
    SET @MessageOutput = @FirstName + ' ' + @LastName



    RAISERROR(@MessageOutput,0,1) WITH NOWAIT

    FETCH NEXT FROM Customer_Cursor INTO
    @CustomerId, @FirstName, @LastName
END
CLOSE Customer_Cursor
DEALLOCATE Customer_Cursor

这里是MSDN如何创建它们的链接。

Here is a link to MSDN on how to create them.

http：// msdn.microsoft.com/en-us/library/ms180169.aspx

这就是我使用Raise Error而不是PRINT输出的原因。
http：// structuredsight.com/2014/11/24/wait-wait-dont-tell-me-on-second-thought/

This is why I used Raise Error instead of PRINT for output.
http://structuredsight.com/2014/11/24/wait-wait-dont-tell-me-on-second-thought/

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