1.借閱事務
*事務操作借書
*/begin transaction
declare @errorsum int
declare @rid varchar(50)
declare @bid varchar(50)
select @rid=rid from reader where rname='張無忌'
select @bid=bid from book where bname='深入。net平台和c#程式設計'
set @errorsum=0
insert into borrow(rid,bid)values (@rid,@bid)
set @errorsum=@errorsum+@@error
update book set bcount=bcount-1 where bname=' 深入。net平台和c#程式設計'
set @errorsum=@errorsum+@@error
update reader set lendnum=lendnum+1 where rname='張無忌'
set @errorsum=@errorsum+@@error
if @errorsum<>0
rollback transaction
else
commit transaction
go2.罰款事務 /*
*事務操作借書
*/begin transaction
declare @errorsum int
declare @rid varchar(50)
declare @bid varchar(50)
select @rid=rid from reader where rname='劉冰冰'
select @bid=bid from book where bname='西遊記'
set @errorsum=0
insert into penalty(rid,bid,ptype,amount) values(@rid,@bid,'1',5.6)
set @errorsum=@errorsum+@@error
update borrow set returndate=getdate() where bid=@bid
set @errorsum=@errorsum+@@error
update reader set lendnum=lendnum-1 where rname='劉冰冰'
set @errorsum=@errorsum+@@error
update book set bcount=bcount+1 where bid=@bid
set @errorsum=@errorsum+@@error
if @errorsum<>0
rollback transaction
else
commit transaction
go3.檢視
1.--建立索引
2.if exists (select * from sysindexes
3. where name = 'ix_book_bookname')
4. drop index book.ix_book_bookname --刪除索引
5./*--筆試列建立非聚集索引：填充因子為30％--*/
6.create index ix_book_bookname
7. on book(bname)
8. with fillfactor = 30
9.go
10.
11.--建立管理員檢視
12.if exists (select * from sysobjects where name='view_borrow')
13. drop view view_borrow
14.go
15.create view view_borrow
16. as
17. select 圖書名稱=book.bname,到期時間=borrow.willdate,讀者姓名=book.bname
18. from borrow,book
19. with (index = ix_book_bookname)
20. where book.bid=borrow.bid
21. --order by borrow.willdate
22.go
23.
24.select * from view_borrow
25.
26.
27.--建立讀者檢視
28.if exists(select *from sysobjects where name='view_book')
29. drop view view_book
30. go
31.create view view_book
32. as
33. select 圖書名稱=bname,圖書總量=bcount,可借閱量=bcount-(
34. select count(*) from borrow where returndate is null and borrow.bid = book.bid
35. ) from book
36. with (index = ix_book_bookname)
37.go
38.
39.select * from view_book
SQL 第六章簡答題
簡答三 begin transaction declare errorsum int declare rid varchar 50 declare bid varchar 50 select rid rid from reader where rname 張無忌 select bid bid fro...
第六章解答題
begin transaction declare errorsum int declare rid varchar 50 declare bid varchar 50 select rid rid from reader where rname 張無忌 select bid bid from bo...
第六章課後習題
1.this和super各有幾種用法？1.子類的建構函式如果要引用super的話，必須把super放在函式的首位。2.子類中的同名成員變數或方法隱藏了父類的成員變數或方法，需要用到super。3.用super直接傳遞引數。2.子類物件例項化的具體過程是什麼？1.子類在構造物件時候，必須訪問父類的建構...