在sp_executesql中使用LIKE [英] Using LIKE in sp_executesql

问题描述

SET @whereCond = @whereCond +'AND名称类似``％''+ @name +``％'''

SET @whereCond = @whereCond + ' AND name LIKE ''%'' + @name + ''%'''

这里有什么问题吗?生成where条件后，用sp_executesql执行该条件，但没有得到任何结果.当我选择不带sp的相同东西时，就可以了.

Is there something wrong here? After I generate where condition, I execute it with sp_executesql, but I did get anything. When I SELECT the same thing without sp, it's ok.

如何在sp_executesql中使用LIKE?你能举一些例子吗?

How to use LIKE in sp_executesql? Can you bring some examples, please?

谢谢.

更新

declare @name nvarchar(50)

set @name = 'a'

SELECT *
    FROM Tbl_Persons WHERE 1 = 1  AND lastname LIKE '%a%' 

exec sp_executesql 
  N'SELECT *
    FROM Tbl_Persons WHERE 1 = 1  AND lastname LIKE ''%@name%''', 
  N'@name nvarchar(50)',
  @name=@name

第一个查询返回值，第二个查询不返回任何值.

First query returns values, second one doesn't return anything.

有什么区别?

推荐答案

以下对我有用的

declare @name varchar(50)

set @name = 'WAITFOR'


exec sp_executesql 
  N'select * from sys.messages WHERE text  LIKE ''%'' + @name + ''%''', 
  N'@name varchar(50)',
  @name=@name

我认为问题必须出在其他地方.

I think the problem must lie elsewhere.

编辑:更新后，您需要使用

Following your update you need to use

exec sp_executesql 
  N'SET @name = ''%'' + @name + ''%'';
    SELECT *
    FROM Tbl_Persons WHERE 1 = 1  AND lastname LIKE @name', 
  N'@name nvarchar(50)',
  @name=@name

按现状，您正在搜索包含实际子字符串@name

As it stands you are searching for text containing the actual substring @name

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