My whole-hearted thanks to you and your team. Related to approach 2: If you are updating 2 properties only then another properties value is 0 default value store into DB. I am confused. Please clear! What if tried to change the value and reverting the same value and trying to commit at last? So will the Hibernate execute and make change in DB without modifying any columns? Please consider disabling your ad blocker for Java4s.
November 5, at AM. Ganesh says:. December 19, at PM. Java4s says:. December 22, at PM. Raghu says:. January 7, at AM. Bhagwan singh says:. August 1, at AM. December 22, at AM. To see how the merge method works consider the following example which persists a Book entity in one transaction, then it modifies it while the entity is in the detached state, and pass the detached entity to merge in a subsequence Persistence Context. Notice that the entity reference returned by merge is different than the detached one we passed to the merge method.
For this reason, you should prefer using update when you are sure that there is no entity reference already attached to the currently running Persistence Context and that the detached entity has been modified. If you enjoyed this article, I bet you are going to love my Book and Video Courses as well.
To persist an entity, you should use the JPA persist method. To copy the detached entity state, merge should be preferred. The update method is useful for batch processing tasks only.
The save and saveOrUpdate are just aliases to update and you should not probably use them at all. Some developers call save even when the entity is already managed, but this is a mistake and triggers a redundant event since, for managed entities, the UPDATE is automatically handled at the Persistence context flush time. Your email address will not be published. Notify me of follow-up comments by email. This site uses Akismet to reduce spam. Linux PinePhone Pro. Google Green Messages.
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Rudi Wijaya 1 1 gold badge 9 9 silver badges 23 23 bronze badges. Add a comment. Active Oldest Votes. Stefan Steinegger Stefan Steinegger I don't think that the problem is in the code to get the entity from the database. It is in the entity itself. To find the problem, turn on dynamic update using org. Check the update statement again.
You see only the modified fields being updated. This helps finding the field that accidentally changed. Check your code where these changes may happen. Many thanks Stefan. I know why the update statement is always called when selecting the data because its value is null.
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