SQL Server存储过程复习（一）

 --存储过程学习篇

 --.简单存储过程不带参数的学习
 IF OBJECT_ID('Orders_GetAllOrders','P') IS  NOT NULL
 DROP PROCEDURE Orders_GetAllOrders;
 GO
 CREATE PROC  Orders_GetAllOrders
 AS
 SET NOCOUNT ON;
 SELECT * FROM dbo.Orders
 GO 

 --.简单存储过程，带参数
 IF OBJECT_ID('Orders_GetAllByName','P') IS NOT NULL
 DROP PROCEDURE Orders_GetAllByName;
 GO
 CREATE PROCEDURE Orders_GetAllByName
 @ShipName NVARCHAR()
 AS
 SELECT * FROM dbo.Orders
 WHERE ShipName=@ShipName
 GO 

 --执行带参数的存储过程
 EXEC Orders_GetAllByName @ShipName=N'Hanari Carnes'

 --.使用带有通配符参数的简单存储过程

 IF OBJECT_ID('Employees_GetAllByName','P') IS NOT NULL
 DROP PROCEDURE Employees_GetAllByName;
 GO
 CREATE PROCEDURE Employees_GetAllByName
 @FirstName NVARCHAR()=N'%',
 @LastName  NVARCHAR()=N'D%'
 AS
 SELECT * FROM dbo.Employees
 WHERE FirstName LIKE @FirstName AND LastName LIKE @LastName;

 --执行存储过程
 EXECUTE dbo.Employees_GetAllByName @FirstName = N'Nancy', -- nvarchar()
     @LastName = N'Davolio' -- nvarchar()

 --.返回多个结果集
 IF OBJECT_ID('GetManyResultsCount','P') IS NOT NULL
 DROP PROCEDURE GetManyResultsCount;
 GO
 CREATE PROCEDURE GetManyResultsCount
 AS
 SELECT COUNT(*) FROM dbo.Orders;
 SELECT COUNT(*) FROM dbo.Employees;
 GO  

 --执行存储过程
 EXEC GetManyResultsCount;

 --使用 OUTPUT 参数的存储过程
 IF OBJECT_ID('GetmanyProducts','P') IS NOT NULL
 DROP PROCEDURE GetmanyProducts;
 GO
 CREATE PROCEDURE GetmanyProducts
 @ProductName NVARCHAR(),
 @MaxPrice MONEY,
 @ComparePrice MONEY OUTPUT,
 @UnitPrice MONEY OUTPUT
 AS
 SELECT p.ProductName,p.UnitPrice FROM dbo.Products AS P
 INNER JOIN dbo.Categories AS C ON C.CategoryID = P.CategoryID
 WHERE p.ProductName LIKE @ProductName AND p.UnitPrice<@MaxPrice

 --设置输出参数
 SET @UnitPrice=(
 SELECT  MAX(P.UnitPrice) FROM dbo.Products AS P
 JOIN dbo.Categories AS C ON C.CategoryID = P.CategoryID
 WHERE p.ProductName LIKE @ProductName AND p.UnitPrice<@MaxPrice
 )
 SET @ComparePrice=@MaxPrice;