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 ;
