站内信表结构设计

create table message_sender(
mid int unsigned not null primary key auto_increment comment ‘站内信自增id‘,
from_uid int unsigned not null default 0 comment ‘发信人id‘,
from_username varchar(30) not null default ‘‘ comment ‘发信人姓名‘,
title varchar(200) not null default ‘‘ comment ‘信息标题‘,
content text not null comment ‘信息内容‘,
from_deleted tinyint unsigned not null default 0 comment ‘是否被发信人删除‘,
date_time int unsigned not null default 0 comment ‘发信时间‘
)charset utf8 comment ‘用户站内信发送表‘;

create table message_receiver(
rid int unsigned not null primary key auto_increment comment ‘自增id‘,
mid int unsigned not null default 0 comment ‘关联站内信id‘,
to_uid int unsigned not null default 0 comment ‘收信人id‘,
to_username varchar(30) not null default ‘‘ comment ‘收信人姓名‘,
is_readed  tinyint unsigned not null default 0 comment ‘是否被收信人阅读‘,
is_deleted tinyint unsigned not null default 0 comment ‘是否被收信人删除‘,
)charset utf8 comment ‘用户站内信接收表‘;