MSSQL Transaction[事务] and Procedure[存储过程]

 --事务分三种
 --1.显示事务
 --我们手动begin transaction ...... commit transaction/rollback transaction
 --上面这种写法叫做“显示事务”

 --2.隐式事务
 SET IMPLICIT_TRANSACTIONS { ON | OFF }隐式事务

 --3.自动提交事务，SQL Server默认使用的是自动提交事务.
 --我们每次执行一条sql语句的时候，sql server都会自动帮我们打开一个事务
 --如果该sql语句执行不出错，则sql server自动提交该事务commit
 --如果该sql语句执行出错了，那么sql server则自动回滚该事务。rollback

 --1：创建第一个简单的存储过程
  CREATE PROC usp_helloworld
  AS
  BEGIN
     PRINT 'hello world!'
  END

  EXEC usp_helloworld

  --2:带参数的存储过程
 CREATE PROC usp_showmsg
 @msg nvarchar(300)  ---多个参数使用,隔开。
 AS
 BEGIN
     PRINT @msg
 END

  EXEC usp_showmsg N'XXX'

  EXEC usp_showmsg @msg=N''

  --3：简单的加法存储过程
  CREATE PROC usp_add
  @n int,
  @m int
  AS
  BEGIN
     PRINT @n+@m
  END

  EXEC usp_add 100,200

  DROP PROC usp_add

 --4：带默认值的存储过程
 ALTER PROC usp_add
 @num1 int = 100,  --为参数加默认值
 @num2 int = 200
 AS
 BEGIN
     PRINT @num1 + @num2
 END

 --5：部分带默认值的存储过程
 ALTER PROC usp_add
 @num1 int = 100,  --为参数加默认值
 @num2 int
 AS
 BEGIN
     PRINT @num1 + @num2
 END

 exec usp_add @num2=50

 --6：存储过程中的输出参数
 SELECT * FROM TblStudent

 ALTER PROC usp_selectByAge
 @age int,
 @count int OUTPUT  -- 输出参数
 AS
 BEGIN
     --1. 根据@age进行查询
     SELECT * FROM TblStudent where tSAge>@age

     --2.返回一共查询出了多少条数据
     SET @count=(SELECT COUNT(*) FROM TblStudent where tsage>@age)
 END

 DECLARE @c int
 EXEC usp_selectByAge @age=20,@count=@c OUTPUT
 PRINT @c

 --7：经典写法：转账使用存储过程来编写
 --存储过程
 CREATE PROC usp_transfer
 @from char(4),
 @to char(4),
 @money money,
 @state bit OUTPUT --1表示转账成功，0表示转账失败！
 AS
 BEGIN
     DECLARE @balance money,@sum int=0
     SET @state=0
     --1.查询@from中的余额
     SET @balance=(SELECT balance FROM bank WHERE bank.cId=@from)
     --2.检查余额是否充足
     IF @balance-@money>10 BEGIN
         ----3.开始事务进行转账
         --打开事务
         BEGIN TRANSACTION
             --1.减钱
             UPDATE bank SET balance=bank.balance-@money where bank.cId=@from
             SET @sum=@sum+@@error
             --2.加钱
             UPDATE bank SET balance=bank.balance+@money where bank.cId=@to
             SET @sum=@sum+@@error

             IF @sum=0 BEGIN
                 SET @state=1 --设置转账成功
                 COMMIT TRAN
             END
             ELSE
                 ROLLBACK TRAN

     END
 END
 --调用存储过程
 DECLARE @ok bit
 EXEC usp_transfer @from='',@to='',@money=800,@state=@ok OUTPUT
 SELECT @ok

 SELECT * FROM bank

 --8：经典：分页存储过程
 SELECT * FROM Customers order by Customers.CustomerID asc

 --创建存储过程
 --参数：
     --每页大小pagesize
     --当先用户要查看第几页
     --总页数
     --总条数
 CREATE PROC usp_get_customers_by_page
 @pagesize int=5, --每页多少条
 @pageindex int=1,  --用户当前要看第几页
 @recordcount int OUTPUT, --总记录条数，输出参数
 @pagecont int OUTPUT     --总页数，输出参数
 AS
 BEGIN
     --1. 分页查询语句
     SELECT
         T.CustomerID,
         T.CompanyName,
         T.City,
         T.[Address],
         T.Phone
     FROM (SELECT *,rn=ROW_NUMBER()OVER(ORDER by CustomerID ASC) FROM Customers) AS T
     WHERE T.rn BETWEEN @pagesize*(@pageindex-1)+1 and @pagesize*@pageindex

     --2.返回总条数
     SET @recordcount=(SELECT COUNT(*) FROM Customers)

     --3.计算总页数，并返回
     SET @pagecont=CEILING(@recordcount*1.0/@pagesize);
 END

 --调用存储过程
 DECLARE @pc int,@rc int
 EXEC usp_get_customers_by_page 7,13,@rc OUTPUT,@pc OUTPUT
 PRINT @pc
 PRINT @rc

 --9：增删改查：存储过程
 --insert
 CREATE PROC usp_insert_newperson
 @name nvarchar(50),
 @age int
 AS
 BEGIN
     INSERT into NewPerson VALUES(@name,@age)
 END
 ------------------------------
 --delete
 CREATE PROC usp_delete_newperson
 @autoId int
 AS
 BEGIN
     DELETE from NewPerson where NewPerson.autoId=@autoId
 END
 ------------------------------
 --update
 CREATE PROC usp_update_newperson
 @autoId int,
 @name nvarchar(50),
 @age int
 AS
 BEGIN
     UPDATE NewPerson set uName=@name,age=@age WHERE NewPerson.autoId=@autoId
 END
 ---------------------------------------
 --select
 CREATE PROC usp_select_newperson
 AS
 BEGIN
     SELECT * FROM NewPerson
 END
 -------------------------------------
 CREATE view vw_newperson
 AS
     SELECT * FROM NewPerson

 --10：其它-----
 SELECT * FROM Contacts
 SELECT * FROM deleted

 INSERT into NewPerson (NewPerson.uName,age)
 OUTPUT INSERTED.autoId  VALUES('王子斌',20)

 ----inserted-------------------    deleted-----------------------

 SELECT * FROM Customers

 DELETE from Customers where Customers.CustomerID='CHOPS'

 SELECT TOP 0 * INTO CustomersBak FROM Customers

 SELECT * FROM CustomersBak

 ALTER TRIGGER tri_customers_after_delete ON Customers
 AFTER DELETE
 AS
 BEGIN
     INSERT INTO CustomersBak SELECT * FROM DELETED
 END

 SELECT * FROM Customers

 DELETE from Customers where Customers.CustomerID IN('CACTU','CENTC','ERNSH')

 CREATE TABLE A20140222 ( A VARCHAR(10))

 DECLARE @SQL varchar(500)
 SET @SQL='CREATE TABLE T_'+CONVERT(VARCHAR(10),GETDATE(),112)+' ( A VARCHAR(10))'
 PRINT @SQL
 EXEC(@SQL )

 PRINT CONVERT(VARCHAR(10),GETDATE(),112)