Hibernate issuing automaic updates

chinnareddy123 · **Joined:** Wed Oct 01, 2008 1:57 pm **Posts:** 2

HI All,
I have some persistent and some non persistent fileds in my POJO class.
After reading the data from the database, if i update any non persistent filed in the POJO class the hibernate issuing the update command for that record.It supposed to issue update command when i update only the pursistent filed.

Below is the sample update query issued by the hibernate

update DDDR.TABLE1 set ASSET_NUM=?, ASSET_TYPE_CD=?, ASSET_DOMAIN_CD=?, QUOTE_ID=?, PARTITION_ID=?, CREATE_TS=?, UPDATE_TS=?, STATE_CD=?, POLICY_NUMBER=?, COMP_ID=?, AFFINITY_ACCT_CD=? where ASSET_ID=?

Bacuse of these updates i am getting deadlock exceptions and unable to read the data also.

Thanks in advacne.

gonzao_diaz · **Joined:** Mon Nov 26, 2007 2:29 pm **Posts:** 443

chinnareddy123,

This statement of yours worries me:

Quote:

After reading the data from the database, if i update any non persistent filed in the POJO class the hibernate issuing the update command for that record

I suspect you don't quite understand what the states of a Hibernate object are (persistent / transient /detached), and what is the purpose of the update() method.

Please read my article here

http://hibernar.org/articulos_en/persis ... ethods.php

and then we can discuss.

chinnareddy123 · **Joined:** Wed Oct 01, 2008 1:57 pm **Posts:** 2

Hi ,
Thanks for your reply.

what I mean to say is, i am using some other variables in the POJO class which are not mapped to any of the persistent filed.

What my understanding in this problem is,
when we change any value in the POJO object and use flush() method
the hibernate will issue the update query to that record with the same values.

Thanks

gonzao_diaz · **Joined:** Mon Nov 26, 2007 2:29 pm **Posts:** 443

Don't worry about hibernate persisting non-mapped fields, that won't happen.

Session.flush() just "levels" the contents of the session, executing whatever SQL statements are necessary so that the database has the same information the session has.
By itself, session.flush() doesn't "generate" any update.

The update() method it is not used "to generate an UPDATE SQL statement". It is used to reconnect a disconnected object back into a session.