Dynamic SQL 动态SQL语句的两种用法

Dynamic SQL

从Dynamic SQL 读取返回值

DECLARE @query as nvarchar(200), @count int;
SET @query = N'SELECT @count = COUNT(*)  FROM Orders';

EXEC sp_executesql @query, 
                   N'@count int OUTPUT', 
                   @count OUTPUT

SELECT @count 

向Dynamic SQL传参数

DECLARE @ParmDefinition nvarchar(500)='@ID INT', @SQLCmd nvarchar(max),@ID INT=0

SET @SQLCmd='SELECT * FROM Sales.Orders WHERE OrderID=@ID'

EXEC sp_executesql @SQLCmd,@ParmDefinition,@ID