user record updates via a cobol program: how to deal with record locks and data changes

What is a good way to handle record locks when a user changes a DB record via a cobol pgm?

Also how to avoid one user's changes from overlaying another user's recent changes.

Is the best way to read with no lock, wait until user enters data into screen, then re-read with a record lock?

And only update the record if there were no changes between the two reads by comparing the entire record strings?


Any other methods that work well?

Maybe read the journal to ensure no one else has changed that particular RRN during the users input?

Thanks!

Joel