谈谈sqlserver自定义函数与存储过程的区别 |
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一、自定义函数： 1. 可以返回表变量 二、存储过程 1. 不能返回表变量 create procedure sp_query_bankMoney as select * from bankMoney go exec sp_query_bankMoney 注* 在使用过程中只需要把T-Sql中的SQL语句替换为存储过程名，就可以了很方便吧！ 加入一笔记录到表bankMoney，并查询此表中userID= Zhangsan的所有存款的总金额 。 Create proc insert_bank @param1 char(10),@param2 varchar(20),@param3 varchar(20),@param4 int,@param5 int output with encryption ---------加密 as insert into bankMoney (id,userID,sex,Money) Values(@param1,@param2,@param3, @param4) select @param5=sum(Money) from bankMoney where userID=Zhangsan go 在SQL Server查询分析器中执行该存储过程的方法是： declare @total_price int exec insert_bank 004,Zhangsan,男,100,@total_price output print 总余额为+convert(varchar,@total_price) go 在这里再啰嗦一下存储过程的3种传回值（方便正在看这个例子的朋友不用再去查看语法内容）: 传回值的区别: output和return都可在批次程式中用变量接收,而recordset则传回到执行批次的客户端中 。
USE pubs
IF EXISTS (SELECT name FROM sysobjects
WHERE name = au_info_all AND type = P)
DROP PROCEDURE au_info_all
GO
CREATE PROCEDURE au_info_all
AS
SELECT au_lname, au_fname, title, pub_name
FROM authors a INNER JOIN titleauthor ta
ON a.au_id = ta.au_id INNER JOIN titles t
ON t.title_id = ta.title_id INNER JOIN publishers p
ON t.pub_id = p.pub_id
GO
au_info_all 存储过程可以通过以下方法执行：
EXECUTE au_info_all
-- Or
EXEC au_info_all
如果该过程是批处理中的第一条语句，则可使用：
au_info_all
实例4：使用带有参数的简单过程 CREATE PROCEDURE au_info @lastname varchar(40), @firstname varchar(20) AS SELECT au_lname, au_fname, title, pub_name FROM authors a INNER JOIN titleauthor ta ON a.au_id = ta.au_id INNER JOIN titles t ON t.title_id = ta.title_id INNER JOIN publishers p ON t.pub_id = p.pub_id WHERE au_fname = @firstname AND au_lname = @lastname GO au_info 存储过程可以通过以下方法执行： EXECUTE au_info Dull, Ann -- Or EXECUTE au_info @lastname = Dull, @firstname = Ann -- Or EXECUTE au_info @firstname = Ann, @lastname = Dull -- Or EXEC au_info Dull, Ann -- Or EXEC au_info @lastname = Dull, @firstname = Ann -- Or EXEC au_info @firstname = Ann, @lastname = Dull 如果该过程是批处理中的第一条语句，则可使用： au_info Dull, Ann -- Or au_info @lastname = Dull, @firstname = Ann -- Or au_info @firstname = Ann, @lastname = Dull 实例5：使用带有通配符参数的简单过程 CREATE PROCEDURE au_info2 @lastname varchar(30) = D%, @firstname varchar(18) = % AS SELECT au_lname, au_fname, title, pub_name FROM authors a INNER JOIN titleauthor ta ON a.au_id = ta.au_id INNER JOIN titles t ON t.title_id = ta.title_id INNER JOIN publishers p ON t.pub_id = p.pub_id WHERE au_fname LIKE @firstname AND au_lname LIKE @lastname GO au_info2 存储过程可以用多种组合执行 。下面只列出了部分组合： EXECUTE au_info2 -- Or EXECUTE au_info2 Wh% -- Or EXECUTE au_info2 @firstname = A% -- Or EXECUTE au_info2 [CK]ars[OE]n -- Or EXECUTE au_info2 Hunter, Sheryl -- Or EXECUTE au_info2 H%, S% = proc2 实例6：if...else --下面是if……else的存储过程： if exists (select 1 from sysobjects where name = Student and type =u ) drop table Student go if exists (select 1 from sysobjects where name = spUpdateStudent and type =p ) drop proc spUpdateStudent go create table Student ( fName nvarchar (10), fAge smallint , fDiqu varchar (50), fTel int ) go insert into Student values (X.X.Y , 28, Tesing , 888888) go create proc spUpdateStudent ( @fCase int , @fName nvarchar (10), @fAge smallint , @fDiqu varchar (50), @fTel int ) as update Student set fAge = @fAge, -- 传 1,2,3 都要更新 fAge 不需要用 case fDiqu = (case when @fCase = 2 or @fCase = 3 then @fDiqu else fDiqu end ), fTel = (case when @fCase = 3 then @fTel else fTel end ) where fName = @fName select * from Student go -- 只改 Age exec spUpdateStudent @fCase = 1, @fName = NX.X.Y , @fAge = 80, @fDiqu = NUpdate , @fTel = 1010101 -- 改 Age 和 Diqu exec spUpdateStudent @fCase = 2, @fName = NX.X.Y , @fAge = 80, @fDiqu = NUpdate , @fTel = 1010101 -- 全改 exec spUpdateStudent @fCase = 3, @fName = NX.X.Y , @fAge = 80, @fDiqu = NUpdate , @fTel = 1010101 |
