sql - SQL 存储过程 - 删除与输入列表匹配的每一行

Question

我需要创建一个存储过程，该过程采用 userId 和 categoryIds 列表，并从特定表中删除任何匹配的行。

伪代码：

@categorylist int[]
@userId int

foreach(category as c in @categorylist)
{
DELETE FROM HelpWith as h
WHERE c.categoryId = h.categoryId
AND h.userId = @userId
}

现在我知道你不应该在 SQL 中使用循环（不是说这无论如何都会起作用......）有谁知道如何制作一个可以做到这一点的存储过程？

Answer 1

从@Categorylist 中创建一个表变量

@Categorylist table (ID int)

DELETE FROM HelpWith 
WHERE categoryId IN (SELECT ID FROM @Categorylist)
AND userId = @userId

Answer 2

对于 SQL Server 和 2008+ 版本，您可以使用表值参数

CREATE TYPE Categorylist AS TABLE (ID int);
GO

CREATE PROCEDURE DoStuff
   @userId int,
   @list Categorylist READONLY
AS
...
DELETE FROM HelpWith 
      WHERE categoryId IN (SELECT ID FROM @list)
      AND userId = @userId
...