RDBMSResolver.updateMode

"umUsingAll"

Uses the old values of all of the modified fields to identify the record to be updated. This is the safest value to use for updating, because it guarantees that another user has not modified any field of the record since you retrieved it. However, this approach is more time consuming and generates a larger update packet.

"umUsingModified"

Uses the old values of all of the fields modified to identify the record to be updated. This value guarantees that another user has not modified the same fields in the record since you retrieved it.

"umUsingKey"

The default value. This setting uses the old value of the key fields. This implies an "optimistic concurrency" model, which most database systems today employ, and guarantees that you are modifying the same record that you retrieved from the database. Your changes overwrite any other user's changes to the same data.