Let us see an example on hibernate update query, update query in hibernate, updating row in hibernate, updating row in database using the hibernate Please consider disabling your ad blocker for Java4s.com, we won't encourage audio ads, popups or any other annoyances at any point, hope you support us:-) Thank you. In the previous tutorials, we had a long discussion about Hibernate select query and how it works.Now we are going to discuss HQL update, delete Queries. If we want to update the multiple records at a time, we can go with HQL update. Jun 11, 2012 Update value of database using hibernate. How to update value of database using hibernate? Hibernate provides facility to update. This by setting the value and calling the update method.
Imagine having a tool that can automatically detect if you are using JPA and Hibernate properly. Hypersistence Optimizer is that tool!
Oracle provides several pseudocolumns, and ROWID is one of them. The ROWID pseudocolumn specifies the address of the underlying database record, and according to Oracle documentation, it’s the fastest way to reference a table row.
As explained on Ask TOM, there are some operations that might lead to a ROWID change (e.g. partitioning or compacting tables). If that’s the case, then you should not rely on the ROWID pseudocolumn since its value iss no longer consistent.
If your database never executes an operation that triggers a ROWID modification, then you should consider using this technique.
Packard bell easynote. In this article, I’m going to show you how you can access a database record by its ROWID when using Hibernate.
The first thing to do is to annotate the JPA entity using the Hibernate-specific @RowId.
Considering that we have the following two entities:
If you wonder about the unusual equals and hashcode implementation choices, then you should read the following article.
The @RowId( 'ROWID' ) mapping tells Hibernate to use the ROWID pseudocolumn when accessing the database record when executing an UPDATE statement.
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Assuming we have the following entities in our database:
When executing the following test case:
Hibernate generates the following SQL statements:
The SELELCT statement includes the ROWID pseudocolumn which is stored in the currently running Persistence Context. During the merge entity state transition, Hibernate copies the detached entity state onto the newly fetched entity versions, and the dirty checking mechanism propagates the changes to the database.
Only the UPDATE statement benefits from the ROWID pseudocolumn, the DELETE statement does not (yet). The HHH-11761 is going to take care of this limitation, but it will only be addressed in 6.0.
So, why would you care about ROWID anyway? After all, every entity has its own identifier, and the underlying Primary Key is indexed as well.
To understand why it’s worth using the ROWID pseudocolumn, it’s better to visualize the Execution Plan for the aforementioned UPDATE statement:
Whereas, when updating a row by its identifier, the Execution Plan is:
Although the Cost is the same in this trivial example, in reality, the TABLE ACCESS BY USER ROWID access path is faster to execute than INDEX UNIQUE SCAN because the Extractor can load the data page directly without having to go to the index to fetch the ROWID.
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Hibernate is not just an ORM tool, but a full-blown data access framework, offering all sorts of performance optimizations. If you are using Oracle and you execute lots of UPDATE statements, it makes a lot of sense to use the @RowId mapping.