Tree Help

Question

Hi,
I'm wondering if anyone can help me. I'm looking to use a tree for the following structure (keys put in to show how the tables work):
We have three main tables:
* users (pk:user_id)
* roles (pk:role_id)
* groups (pk:group_id)
A user can have many roles, a role can have many groups, so there are two joining tables:
* users_roles (pk:ur_id,fk:user_id,fk:role_id)
* group_roles(pk:gr_id,fk:group_id,gk:role_id)
I want to have a tree which has a list of users which I can then expand to show me a list of roles that user has. Then, I can expand the role and see the groups assigned to that role. Is this at all possible?
I have the SQL which does the table joins etc (so I can see what roles a user is in, groups in those roles) however I am unable to map this into the tree component.
Any help is very much appreciated.
Thanks,

Answer 1

EXCELLENT! :) Thank-you very much.
I had to make a few modifications and put the whole thing in a view, but got it working in the end! Here is my code in case anyone is interested:
CREATE OR REPLACE VIEW xxtest AS
SELECT
  1 id,
  NULL pid,
  'Users' title,
  NULL link
FROM
  dual
UNION ALL
SELECT
  user_id + 1000000 id,
  1 pid,
  user_name title,
  NULL
FROM
  xxapx_fnd_user xfu
WHERE
  TRUNC(sysdate) BETWEEN xfu.effective_start_date AND xfu.effective_end_date AND
  NVL(xfu.account_locked,'N')='N'
UNION ALL
SELECT
  xfur.role_id+2000000 id,
  xfur.user_id+1000000 pid,
  xfr.name title,
  NULL
FROM
  xxapx_fnd_user_roles xfur,
  xxapx_fnd_roles xfr
WHERE
  xfr.role_id=xfur.role_id AND
  TRUNC(sysdate) BETWEEN xfur.effective_start_date AND xfur.effective_end_date
UNION ALL
SELECT
  xfgr.group_id+3000000 id,
  xfgr.role_id+2000000 pid,
  xfg.group_name title,
  NULL
FROM
  xxapx_fnd_group_roles xfgr,
  xxapx_fnd_groups xfg
WHERE
  xfg.group_id=xfgr.group_id AND
  NVL(xfgr.enabled,'N')='Y'
)My only issue now is that the tree defaults to be expanded. I want it to default to being collapsed and then expand each node individually as clicked. I'm sure it's a small setting somewhere but I can't find it at the moment! :( (late in the day!)