Comments on: SaveOrUpdate versus Merge in Hibernate

By: SJJ

SJJ — Sat, 21 Aug 2010 09:06:34 +0000

Thanks for the useful information

By: Harish

Harish — Sat, 10 Jul 2010 10:13:29 +0000

Its a very good tutorial. It helped me a lot in understanding the difference between merge and update method.

By: Suresh

Suresh — Thu, 10 Jun 2010 22:58:49 +0000

Thanks for the great tutorial.

I want to comment on merge(), it works fine on updating the object as long as object does not have BLOB data fields.

I have a table with BLOB columns and other data type columns.

1st Scenario:
if I use merge() method all other columns will update successfully with modified data except BLOB columns.

2nd Scenario:
if I use update() method, it updates the BLOB columns as well, n my UI I don’t show all the columns from table. In such case, it updates with null values.

Any ideas or suggestions to fix this issue?

Very much appreciated…

By: sampath

sampath — Fri, 28 May 2010 12:57:57 +0000

yah its good for the developers they got any exception these method is very help full

By: Ramanathan

Ramanathan — Wed, 26 May 2010 05:04:15 +0000

Excellent write up. Got this page exactly at the time I needed.
Most of the books provide the (boring) theory of the APIs but not the practical usage. Your chronicle gave a clean insight on where to use it with a simple example.

Thanks much.

ps: Do post more of such articles.

By: Sujatha

Sujatha — Mon, 07 Dec 2009 09:34:13 +0000

Hi really very helpful….Thanks for ur article

By: Surya

Surya — Thu, 22 Oct 2009 06:36:16 +0000

Excellent ..

By: Siddiq

Siddiq — Fri, 14 Aug 2009 16:03:51 +0000

Hi ,

I am not able to update the database when using merge. and when use update hibernate throws non-Unique object exception.
I need to update the Case table , in which I need to get the case by a case id , and set the new values and then update the object to the database, while updating if I use merge, updated data is not reflecting in the DB and when using update or save , hibernate throws non-unique object exception.

Any idea why merge is not updating the database. ?

By: nyuby

nyuby — Fri, 10 Jul 2009 02:59:53 +0000

Hello, it’s good tutorial, but i have a little confuse, if i using merge and using session with getCurrentTransaction, why i must be commit transaction manually ? I see if i have getCurrentTransaction the transaction will be closed and commit automatically, in this case, why did’nt work … could you give me some explanation please ?

By: raja

raja — Wed, 01 Jul 2009 12:25:59 +0000

Hi Raffy
Can you please advise my case which i expalined few days back. Since I am not getting that exception and wondering whts the use of merge(). Your thoughts will be appreciated