Hvordan administrerer man brugerroller i en database?

Du bruger en jointabel:role_id og permission_id til at identificere, hvilke tilladelser der er knyttet til hvilke roller

EDIT:

Eksempeltabeller

ROLE-tabel

Role_ID Role_Name
1       Standard User
2       Super User
3       Guest

TILLADELSESTabel

Permission_ID Permission_Name
1             View User List
2             Update Own User Account
3             Update Any User Account

ROLE_PERMISSION-tabel

Role_ID Permission_ID
1       1    // Role 1 (Standard User) grants View User List
1       2    //        and Update Own User Account
2       1    // Role 2 (Super User) grants View User List,
2       2    //        Update Own User Account,
2       3    //        and Update Any User Account
3       1    // Role 3 (Guest) grants View User List

Visning af tilladelserne for et angivet Role_ID

select R.role_id,
       P.permission_id,
       P.permission_name
  from role R,
       permission P,
       role_permission RP
 where RP.permission_id = P.permission_id
   and RP.role_id = R.role_id
   and R.role_id = 1