Reject user from SQL-DB

[JB]

Hi,

I'm afraid I'm currently not seeing the wood for the trees, please  
help me out. ;-)

I'm using stored procedures in MySQL to query for check and reply  
items for users. I don't need (or want) user groups so there's always  
a positive Fall-Through attribute returned.

There are quite a few possibilities why a user can get rejected: Wrong  
login, banned from this location, generally blocked, session time/ 
timespan exceeded and so on...
As a result of the information gathered in these stored procedures I  
know whether the user may connect or not.
My question: What attributes do I have to return from MySQL to reject  
this user??? Am I getting my wires crossed?

Thanks a lot!
JB