动态SQL基础

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;