Am i clear? Let me know if not.
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Record Lock in Java
Hi All
I have question on Record Lock in Java.
I have this Situation.
In our web application, a user can login and search all the (some product )cases which are open.
He opens up this case, see the details and click on EDIT button to edit the case.
At the same time another user logins and tries to edit or delete.
Then a message should pop up saying, the record is locked.
How do i lock the record for one particular user, and unlock after he is done updating ?
Tha application is built on Struts.
Thanks
Vinay
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Answers
What happens if the first User clicks on Edit and then he never actually saves the updated values(or the browser dies, network goes down etc etc). The Record will be locked on forever and no one would unlock the record.
A good approach is to have concurrency check in the system using version numbers. Have a version number column in the database table. Both Users A and B get the record say with version 6. A updates the record and saves it. The version is updated to 7. Now B saves the record. The versin of B is 6 and in db is 7. If the versions do not match, throw an error indicating the same and do not update the record.
Locking the Record on clicking the Edit button will have the problem that I mentioned above. There is no guaranteed way of unlocking the record.
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by: alexander_ivanovPosted on 2006-02-25 at 02:14:31ID: 16044886
Hello,
I see two solutions. First one is lock record on database level, you have to do some tuning on database and lock correspondent record(s) when user start edit. Then when another user tries to edit same record exception will be thrown, your programm will catch this exception and inform second user. This way is most sure, because of database will forbid any concurrent modifications.
Second solution is to keep opened records in static ArrayList(for example) and every time user try to edit something programm will check if this record exists in that ArrayList. When record is not in list then add it into list and allow edit, or show alert otherwise.