Hibernate merge not updating

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But In updation what i want to do is I Only want to update only those field which has been changed, e.g in my example only update_time and update_user will be changed, so only this columns should be updated not the create_user, and create_update query is also running and it is updating all the fields like,update role... The dynamic-update option only works when the entity was loaded by the session.

Hibernate must know the initial state, otherwise it can't detect which properties that has been changed.

if it is not the defualt value then leave it as it is, why r u setting it to defualt Value.

and if you find other value then the stored one then update that you agree with that?

There is a possibility that the following may work if dynamic-update has been enabled, but I am not 100% that there are no side-effects if things are more complicated than simple properties.In my previous and current project, I have run into cases where I needed to save an object to database using hibernate, and from time to time, I run into some sort of Hibernate Session Exception.I did a bit of google search, and it turns out that when saving an object, I needed to make sure the object was attached to Hibernate session.However, I have no idea what you should do if you ever want to store a null value in the database...The dynamic-update="true" option will also affect performance negative since Hibernate needs to rebuild the SQL for every update instead of using a pre-generated SQL. String, and by some property(in hbm) i tell hibernate that this will be my default value, so whenever you are going to update a tuple then check whether it is a default value or any other value?

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