實驗八T-SQL的使用

實驗六   T_SQL的應用

 

一、實驗目的：

1．掌握在SQL_SERVER2012觸發器的定義和作用。

2．掌握在SQL_SERVER2012存儲過程的定義和作用。

3．掌握在SQL_SERVER2012的事務定義和作用。

 

二、實驗準備

複習課堂筆記中相關內容的介紹，設計相關程序。

 

三、實驗內容

1．驗證如下範例，並記錄結果，分析各個觸發器和存儲過程的作用。

例1：CREATE  TRIGGER tri1

ON sc

FOR insert

AS

update student setcnum=cnum+1

wherestudent.sno=(select sno from inserted where student.sno=inserted.sno)

//-----------------------------------------------------------------------------------------------------------------------------//

例2：CREATE  TRIGGER tri3

ON sc

FOR update

AS

if update(sno)

begin

   update student set cnum=cnum-1

   where student.sno=(select sno from deletedwhere student.sno=deleted.sno) 

   update student set cnum=cnum+1

   where student.sno=(select sno from insertedwhere student.sno=inserted.sno)

end

//-----------------------------------------------------------------------------------------------------------------------------//

例3：CREATE PROCEDURECJCXPROC AS

SELECT STUDENT.SNO,SNAME,COURSE.CNO,CNAME,GRADEFROM

STUDENT,COURSE,SC WHERESTUDENT.SNO=SC.SNO AND  COURSE.CNO=SC.CNO

GO

//-----------------------------------------------------------------------------------------------------------------------------//

例4：CREATE PROCEDURECJCXPROC1 @x char(5)

AS

selectsc.sno,sname,sc.cno,cname,grade from student,course,sc where student.sno=sc.snoand course.cno=sc.cno and sc.sno=@x order by sc.cno

GO

//-----------------------------------------------------------------------------------------------------------------------------//

例5：ZZZ

   end

2．創建一個存儲過程，它的功能是給出一個學生的姓和名，該存儲過程將顯示該學生所學課程名和該課程的分數。定義該過程，並調用運行，觀察結果。

3．在存儲過程中使用事務操作，定義一個存儲過程，該過程作用是向實驗樣例數據庫的Student表中插入一條數據，在插入數據時驗證輸入的學生姓名是否重複。如果不重複，插入數據有效；否則，插入數據無效，回滾事務撤銷操作。

 

 

四、實驗報告內容

記錄上機運行情況記錄，如出錯，分析原因並改正，記錄下正確的命令。

 code:

CREATE  TRIGGER tri1
ON sc
FOR insert
AS
update student set cnum=cnum+1
where student.sno=(select sno from inserted where student.sno=inserted.sno)

CREATE  TRIGGER tri3
ON sc
FOR update
AS
if update(sno)
begin
   update student set cnum=cnum-1
   where student.sno=(select sno from deleted where student.sno=deleted.sno)  
   update student set cnum=cnum+1
   where student.sno=(select sno from inserted where student.sno=inserted.sno)
end


CREATE PROCEDURE CJCXPROC AS
SELECT STUDENT.SNO,SNAME,COURSE.CNO,CNAME,GRADE FROM 
STUDENT,COURSE,SC WHERE STUDENT.SNO=SC.SNO AND  COURSE.CNO=SC.CNO
GO

CREATE PROCEDURE CJCXPROC2 @x char(5)
AS
select sc.sno,sname,sc.cno,cname,grade from student,course,sc where student.sno=sc.sno and course.cno=sc.cno and sc.sno=@x order by sc.cno
GO

begin transaction t11 with mark 'aaa'
declare @x int
set @x=1
delete from student where sno='200215122'
if @x=-1
      begin
            rollback transaction t11
   end
else
   begin
            delete from sc where sno='200215122'
            commit transaction t11
END

 alter PROCEDURE PROC5
  as 
 DECLARE @y CHAR(10)
 set @y = '王敏';

 select student.sno,sc.cno,grade
 from sc,student
 where sname = @y
 return
 go

 exec proc5

 create procedure proc6
    @x1 char(9),@x2 char(20),@x3 char(2),@x4 int,@x5 char(20)
 as
 begin transaction t12 with mark 'aba'
 insert into student values( @x1,@x2,@x3,@x4,@x5)
select * from student

DECLARE @x CHAR(10) 
 select @x = count(sname) from student
       where sname =@x2

if @x>1
   begin
       rollback transaction t12
	   select * from student
   end
else
   begin
       
       commit transaction t12
	   select * from student
   End
   go

   
  exec proc6  '200215131','李勇22','男',20,'cs'

數據庫實驗就此結束，就最後的課程設計了 。