vb.org Archive - Permissions structure

I have a project I'm trying to set up but I'm not sure how to go about it.

I have a list of projects in a table ( called projects )

What I want to do is add permissions to this either by adding a field on the projects table or the users table.

I want to have the following scenrios,

User A can see every project except project 1
User B can only see project 2
User C can see everything

I was thinking of having 2 columns in the userstable

Allow
Deny

in these fields would be a list of project id's.

any suggestions on the best way of doing this ?

I was thinking of the following way

Code:

if allow is empty {

      if deny is emtpy {

                   select * from project

           } else {

                  select * from project where projectid is not in Deny

     } else {

select * from project where projectid is in Allow

}

hopefully that makes sense, can someone think of a better way of doing this ? seems a little messy i think

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