web-QQ(腾讯)-EMail-QQMsg(仿QQ短信)-数据库设计

-- =============================================
-- ylb;仿QQ短信
-- development time:11:35 2012-04-18
-- =============================================
use master
go
IF EXISTS (SELECT * 
       FROM   master..sysdatabases 
       WHERE  name = N'QQMessage')
    DROP DATABASE QQMessage
GO

CREATE DATABASE QQMessage
GO

use QQMessage
go
-- =============================================
-- ylb;1,Users
-- remark:用户表
-- =============================================
create table Users
(
userId int primary key identity(100,1),    --编号[PK]
nickname varchar(200) not null,        --昵称
userpass varchar(200) not null,        --密码
headImage varchar(200),            --头像地址
username varchar(200),            --备注姓名
flag int default(0) check(flag in(0,1))    --标识，flag=1,说明此用户已注销，0：正常
)

go
-- =============================================
-- ylb;2,Note
-- remark:短信表
-- =============================================
create table Message
(
msgId int primary key identity(200,1),    --编号[PK]
toUserId varchar(200) not null,        --收信人编号[FK]
content varchar(500) not null,        --发新内容
pubdate datetime default(getdate()),    --发送时间
sendUserId int        --发送用户编号[FK]

)
-- =============================================
-- ylb;3,Friend
-- remark:好友表
-- =============================================
create table Friend
(
userId int not null,    --用户编号
friendId int not null    --用户好友编号

)

print '数据创建成功！'

-- =============================================
-- ylb;仿QQ短信
-- development time:11:35 2012-04-18
-- =============================================
use QQMessage

go
--InsertData
insert into Users(nickname,userpass,headImage) values('sunshine','m123','default.jpg')
insert into Users(nickname,userpass,headImage) values('rain','m123','default.jpg')
insert into Users(nickname,userpass,headImage) values('lanchong','m123','default.jpg')
insert into Users(nickname,userpass,headImage) values('sun','m123','default.jpg')

select * from Users


go
--修改备注
update Users set username='袁博' where userId=102
go
--登录
select count(*) from Users where userId=100 and userpass='m123'
go
--删除一组会话
delete Message where toUserId=100 and sendUserId=101 or toUserId=101 and sendUserId=100


go
--1，发送信息
--1,outBox
insert into Message(toUserId,content,sendUserId) values(100,'I is sunshie',101)
--2,inBox
insert into Message(toUserId,content,sendUserId) values(101,'Who are you?',100)

insert into Message(toUserId,content,sendUserId) values(100,'sunshie',101)


go
--2,我的收信列表
--2_1,List
select userId,nickname,headImage,username from Users
where userId in(select sendUserId from Message where toUserId=100) 
or userId in(select toUserId from Message where sendUserId=100)

go
--2_2,附属最近的一条短信
select top 1 msgId,toUserId,content,pubdate,sendUserId from Message 
where toUserId=100 and sendUserId=101 or toUserId=101 and sendUserId=100
order by msgId desc





--最新的回复
select top 1 content from Message where toUserId=101 and sendUserId=100
order by msgId desc

go
select userId,nickname,headImage,username from Users
where userId in(select sendUserId from Message where toUserId=100)

select userId,nickname,headImage,username,content from Users u left join Message m
on u.userId=m.toUserId


go
--3，单机看详细
select * from Users
select * from Message

go
--3_1,获取备注
select nickname from Users where userId=1

go
--3_2,获取列表
select * from Users u left join Message m
on u.userId=m.toUserId
go
--结论
select userId,nickname,headImage,username,msgId,content,pubdate,sendUserId from Users u 
left join Message m on u.userId=m.toUserId
where toUserId=100 and sendUserId=101 or toUserId=101 and sendUserId=100