动态SQL基础
动态SQL就是我们可以动态构造SQL代码,然后再执行这个批处理。有两种执行动态SQL的方法,分别是EXEC命令和sp_executesql存储过程。下面是示例代码。
USE TSQLFundamentals2008;
GO -- 动态SQL
-- 方法一:EXEC命令(支持普通字符和Unicode字符)
DECLARE @sql AS NVARCHAR(100);
SET @sql=N'PRINT ''这条消息是动态SQL命令打印的.'';';
EXEC(@sql); DECLARE @sql AS NVARCHAR(100);
DECLARE @OrderIDs AS NVARCHAR(50)= '10248,10249,10250';
SET @sql= N'SELECT * FROM Sales.Orders WHERE orderid IN ('+@OrderIDs+');';
EXEC(@sql); -- 方法二:sp_executesql存储过程(只支持Unicode字符)
DECLARE @sql AS NVARCHAR(100);
SET @sql= N'SELECT orderid,custid,empid,orderdate
FROM Sales.Orders
WHERE orderid=@orderid;'; EXEC sys.sp_executesql
@stmt= @sql,
@params= N'@orderid AS INT',
@orderid=10248;
执行结果:
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" 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