/********* USER **********************/
create table USER  www.yisu2017.com  
(
   ID                   int unsigned,
   USERNAME             varchar(10) not null,
   PASSWORD             varchar(32) not null,
   GENDER               tinyint,
   BIRTHDAY             date,  www.yisu2017.com  
   IMAGEURL             varchar(30),
   CREATED_DATE         timestamp,
   STATUS               tinyint default 1
)engine=innodb, default charset=utf8;
alter table USER add constraint PK_USER primary key (ID);
alter table USER modify column ID int unsigned not null auto_increment;
 
create unique index IX_USER_USERNAME on USER (USERNAME);
create index IX_USER_PASSWORD on USER (PASSWORD);
create index IX_USER_CREATED_DATE on USER (CREATED_DATE);
 
/*******   MESSAGE  **************/
create table MESSAGE
(
   ID                   int unsigned,
   USER_ID              int unsigned not null ,                
   CONTENT              varchar(400) not null ,
   CREATED_DATE         timestamp,
   STATUS               tinyint default 1
)engine=innodb, default charset=utf8;
  
alter table MESSAGE add constraint  PK_MESSAGE primary key (ID);
alter table MESSAGE modify column ID int unsigned not null auto_increment;
 
alter table MESSAGE add constraint FK_MESSAGE_USER foreign key(USER_ID) references USER(ID);
 
create index IX_MESSAGE_USER_ID on MESSAGE (USER_ID);
create index IX_MESSAGE_CREATED_DATE on MESSAGE (CREATED_DATE);
//注意设置引擎为innodb，而且USER_ID类型要和USER（ID）类型一致，否则外键是不能添加成功的。