SQLite数据库建立主键/外键的方法

create table t_group  
(  
    id integer,  
    primary key (id)  
);  
create table t_user  
(  
    id integer,  
    name text,  
    groupId integer,  
    primary key(id),  
    foreign key (groupId) references  t_group(id) on delete cascade on update cascade  
);  

insert into t_group values(1);  
insert into t_group values(2);  
insert into t_user values(1,"j",2);  
insert into t_user values(2,"a",3);