用户，角色，功能三者之间的关系视图

假设有如下数据库结构：




create table userinfo(id varchar(20),name varchar(20));


create table roleinfo(id varchar(20),name varchar(20));


create table functioninfo(id varchar(20),name varchar(20));






create table userrole(userid varchar(20),roleid varchar(20));


create table rolefunction(roleid varchar(20),functionid varchar(20));






insert into userinfo values("1","gao1");


insert into userinfo values("2","gao2");


insert into userinfo values("3","gao3");




insert into roleinfo values("1","role1");


insert into roleinfo values("2","role2");


insert into roleinfo values("3","role3");






insert into functioninfo values("1","function1");


insert into functioninfo values("2","function2");


insert into functioninfo values("3","function3");






insert into userrole values("1","1");


insert into userrole values("1","2");


insert into userrole values("2","2");


insert into userrole values("3","1");


insert into userrole values("3","2");


insert into userrole values("3","3");




insert into role function values("1","1");


insert into role function values("1","2");


insert into role function values("2","2");


insert into role function values("3","1");


insert into role function values("3","2");


insert into role function values("3","3");



我们可以根据三者连接的结果建立视图，得出整个权限模型的数据




select u.name as username,r.name as rolename,f.name as functionname


from userrole ur inner join userinfo u on ur.userid=u.id


inner join roleinfo r on ur.roleid=r.id


inner join rolefunction rf on rf.roleid=r.id


inner join functioninfo f on rf.functionid=f.id


order by u.name;

结果：