ADF - Locking the record ???

Question

I am using Jdeveloper 11.1.2.3.0. I am very new to ADF environment.
In my use case. There are 2 systems, from both the users can access the candidate records concurrently. one system is implemented in ADF and other is in Forms.
From forms environment when a candidate record is opened and when the same record is tried to open in the ADF system it throws a message saying "Record Locked".
My requirement is to issue the same kind of error message when the candidate record is first opened in the ADF system and tried to open from other system.
Could some one guide me ???
Thanks in advance.
Edited by: 977844 on Jan 14, 2013 9:24 AM

Answer 1

Hi.
By default, ADF 11.2 uses optimistic locking. This means instead of locking a row as soon as it is changed, the framework waits until the changed row is committed before attempting to obtain a lock.
What you need is pessimistic locking: If anyone else tries to get a lock of the same row during this process, he will be forced to wait until the first transaction has completed. You can enable it by editing the adf-config.xml file.
You need to be careful, however. Every time an application module is recycled, a rollback is issued on the JDBC connection. This releases all the current locks established through the connection. Thus, all changes that were posted but not commited are lost. One possible way to mitigate that would be to disable JDBC connection pooling (jbo.doconnectionpooling = false).The jbo.doconnectionpooling configuration parameter is set by checking the Disconnect Application Module Upon Release property on the Pooling and Scalability tab of the Business Components Configuration dialog. This will severely limit the scalability of you application, however. You will consume more resources on the database server, also, since you will hold on more database connections than really needed.
Best Regards,
Frédéric.