T-SQL 将 CSV 字符串传递到存储过程时出现问题

问题描述：

我有那个过程，它返回由 ID 与传递的参数关联的行，即 1,5,7,9

I have that procedure which returns rows associated by ID with passed argument, i.e 1,5,7,9

ALTER PROCEDURE [dbo].[get_data]
 @MyCodes as varchar(max) = ''
AS
BEGIN
 DECLARE @query as nvarchar(max)

 set @query = 'SELECT name FROM user WHERE id IN (@p_MyCodes)'

 exec SP_EXECUTESQL @query,
                        N'@p_MyCodes varchar(max)', 
                        @p_MyCodes = @MyCodes
END

该过程产生一个错误:将数据类型 varchar 转换为数字时出错.当我作为参数传递时，例如3,7,5

That procedure generates an error : Error converting data type varchar to numeric. when I pass as an argument e.g. 3,7,5

怎么了?

答

我认为这不会实现您的期望.您遇到的错误是因为它无法将字符串 '3,7,5' 转换为数字(请注意，它不会尝试解析您的各个值).

I don't think this is going to accomplish what you are expecting it to. The error you are getting is because it can't convert the string '3,7,5' to a number (note that it is NOT trying to parse out your individual values).

获得您想要的东西的两种方式:

Two ways to get what you want:

1) 创建一个接受 CSV 字符串并返回结果的表值函数(我确定网上有很多；这是一个相关问题:T-SQL 中的等价拆分函数?).这很好，因为您可以完全摆脱 SP_EXECUTESQL sproc 调用；您的查询变为:

1) Create a table value function that takes a CSV string and returns the results (I'm sure there are many on the web; Here's a related question: Split function equivalent in T-SQL?). This is nice because you can get rid of the SP_EXECUTESQL sproc call entirely; Your query becomes:

SELECT name FROM user where id IN (SELECT value FROM dbo.f_Split(@p_MyCodes))

2) 将您的设置更改为:

2) Change your set to something like:

set @query = 'SELECT name FROM user WHERE id in (' + @p_MyCodes + ')'

我不推荐 #2，它提供了一个 SQL 注入漏洞.

I don't recommend #2, it offers a SQL injection hole.

T-SQL 将 CSV 字符串传递到存储过程时出现问题

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