On-lock Trigger not working properly.

Question

Hi Everyone,
I need to use on-lock trigger to satisfy the requirement.
The requirement is - for a given supplier name and supplier profile the form should be locked.Normally forms locks row by row. But my requirement is if any user doing some changes on a specific supplier and supplier profile then no other user can change for that supplier and supplier profile. If any user opens that then we need to show that it has been locked by some other user.
But the 2nd user can open the same form for some other supplier and supplier profile.
I need to write an on-lock trigger.
Can you please suggest what should I write in on-lock trigger ?
let table name is SUPPLIER  sp.
THEN
sp.supplier_name = :blk1.supplier_name
and sp.supplier_prof = :blk1.supplier_prof
The above condition should be locked.
Please help me out.

Answer 1

Ok, so whenever you select a new supplier/profile in your blk1, you want to lock that supplier/profile.
What you could do:
1. lock the supplier immediately after the selection. I guess your block blk1 is not a db-block, so you would ad the locking at the end of your selection-procedure
2. lock the supplier as soon as you start editing one of the country-rows, here you could use the ON-LOCK-trigger.
An example of how the Locking-code looks is here Re: [Block based on From Query] On-Lock Trigger
You have to do some additional steps, in the exception case (lock failed) you have to disable the whole county-block (with using SET_BLOCK_PROPERTY)
Hope this helps