sql - SQL Server 转换失败

Question

Possible Duplicate:
using dynamic IN clause in MSSQL

我有一个 SQL 语句，其中包含诸如 @StartRow, @StartEnd, @CategoryIds 之类的参数.

SELECT * FROM StackOverFlow
WHERE
StartRow = @StartRow
AND StartEnd = @StartEnd
AND CategoryId IN (@CategoryIds)

当我设置如下参数时:

DECLARE  @StartRow INT = 1;
DECLARE  @StartRow INT = 10;
DECLARE  @CategoryId NVARCHAR(50);
set @CategoryId ='124,125'

失败的消息是:

Conversion failed when converting the nvarchar value '124,125' to data type int.

当我手动设置 SQL where 语句时，如下所示:

WHERE
StartRow = @StartRow
AND StartEnd = @StartEnd
AND CategoryId IN (124, 125)

它有效。

如何解决转换问题？

Answer 1

您需要使用dynamic SQL为了这。所以你会写

DECLARE  @StartRow INT = 1;
DECLARE  @StartRow INT = 10;
DECLARE @CatogoryIds NVARCHAR(50);
SET @CatogoryIds = N'124, 125';
DECLARE @SQL NVARCHAR(MAX);
SET @SQL = N'
    SELECT * 
    FROM StackOverFlow
    WHERE
        StartRow = ' + @StartRow + 
      N' AND StartEnd = ' + @StartEnd + 
      N' AND CategoryId IN (' + @CategoryIds + N');';
EXEC(@SQL);
GO

我希望这会有所帮助。