In my case I assume that the owner are all correct this because in my specs I have somethig like :
The id value (an 8 digit number) of the customer who has booked this. Note that for this application, you should assume that customers and CSRs know their customer ids. The system you are writing does not interact with these numbers, rather it simply records them. If this field is all blanks, the record is available for sale.
Apropos booking what you do by booking ?
I just modify the last field(Customer holding this record) for the booked record. and on release I "blank" this field.
[ April 20, 2006: Message edited by: Mihai Radulescu ]
For booking, I read the record from the file, make sure the owner field is blank and then set the new owner into it, then call dbMainImpl.update(data)