表的设计及字段说明

lib_user

字段

数据类型

作用

userid

varchar(50)

主键,学号,可用于登录

userpassword

varchar(50)

密码

username

varchar(50)

用户姓名

userredp

varchar(50)

院系

其他自己扩展

lib_book

$E = mc^2$

字段

数据类型

作用

bookid

int

自增主键

bookname

varchar(50)

xx

bookname

varchar(50)

xx

bookname

varchar(50)

xx

bookname

varchar(50)

xx

bookname

varchar(50)

xx

其他自己扩展

lib_book_borrow

字段

数据类型

作用

borid

int

自增主键

bookid

int

lib_book外键

userid

varchar(50)

lib_user外键

bordate

date

借阅日期

retdate

date

还书日期

borstate

int

借阅状态(正在借阅,已经还书,续借,已经过期)

bookbag

字段

数据类型

作用

bookid

int

lib_book外键

usreid

varchar(50)

lib_user外键

bookbag建表SQL语句

其他类似,暂列一个

CREATE TABLE lib_borinfo

(

userid varchar(50);

bookid int;

FOREIGN KEY (userid) REFERENCES lib_user(userid);

FOREIGN KEY (bookid) REFERENCES lib_book(bookid);

ADD CONSTRAINT unique_bor_book UNIQUE (userid,bookid);

)

用户登录验证SQL语句

select * from lib_user where(userid=@userid, userpassword=@password)

用户密码变更SQL语句

update lib_user set userpassword=@password

图书检索SQL语句

暂且列一个以图书名搜索的,其他类似

select * from lib_user where(bookname=@bookname);

添加到书包SQL语句

use library;

insert into bookbag(userid, bookid) values (@userid, @bookid);

书包查询SQL语句

use library;

select * from lib_book where

(bookid in (select bookid from bookbag where userid=@userid));

从书包删除

use library;

delete from bookbag(userid, bookid) values (@userid, @bookid);

借阅图书

因为书可能是一起借,但是不一定同时还啊,所以必须一本书,对应一个borid.

use library;

insert into lib_borrow(borid,bookid,userid,bordate,retdate,borstate)

values (@borid, @bookid,@userid,@bordate,@retdate,@borstate);

每借阅一本图书,lib_book里面数量减一的触发器

create trigger BookDec1

on lib_borrow

after insert

as

update lib_book set bookres=bookres-1

from lib_book, inserted

where

lib_book.bookid=inserted.bookid;

每借阅一本图书,相应的从bookbag里面删除的触发器

create trigger BookbagDel

on lib_borrow

after insert

as

delete bookbag

where bookid in (select bookid from inserted)

and userid in (select userid from inserted);

还书SQL语句

use library;

update lib_borrow set retdate=@date, borstate='1' where borid=@borid;

lib_book表加一的触发器

create trigger BookbagDel

on lib_borrow

after update

as

update lib_book set bookres=bookres+1

from lib_book, inserted

where

lib_book.bookid=inserted.bookid;

当前借阅信息查询SQL语句

多表查询

use library;

select * from lib_borrow

left join lib_book on lib_book.bookid=lib_borrow.bookid

where lib_borrow.userid=@userid and lib_borrow.borstate=0;

历史借阅信息查询SQL语句

use library;

select * from lib_borrow

left join lib_book on lib_book.bookid=lib_borrow.bookid

where lib_borrow.userid=@userid and lib_borrow.borstate=1;

图书借阅排行榜

select * from

(select bookid, bor_sum=COUNT(lib_borrow.bookid)

from lib_borrow group by lib_borrow.bookid) as A

left join (select * from lib_book) as B

on A.bookid = B.bookid

order by A.bor_sum desc

用户图书借阅排行榜

select * from(select userid, user_sum=COUNT(lib_borrow.userid)

from lib_borrow group by lib_borrow.userid) as A

left join (select userid1=userid,username,usersex,userredp from lib_user) as B

on A.userid = B.userid1 order by A.user_sum desc ;