Formula in Hibernate
By: Dorris in Hibernate Tutorials on 2011-01-01
Sometimes, you want the Database to do some computation for you rather than in the JVM, you might also create some kind of virtual column. You can use a SQL fragment (aka formula) instead of mapping a property into a column. This kind of property is read only (its value is calculated by your formula fragment).
@Formula("obj_length * obj_height * obj_width") public long getObjectVolume()
The SQL fragment can be as complex as you want and even include subselects.
This policy contains information about your privacy. By posting, you are declaring that you understand this policy:
- Your name, rating, website address, town, country, state and comment will be publicly displayed if entered.
- Aside from the data entered into these form fields, other stored data about your comment will include:
- Your IP address (not displayed)
- The time/date of your submission (displayed)
- Your email address will not be shared. It is collected for only two reasons:
- Administrative purposes, should a need to contact you arise.
- To inform you of new comments, should you subscribe to receive notifications.
- A cookie may be set on your computer. This is used to remember your inputs. It will expire by itself.
This policy is subject to change at any time and without notice.
These terms and conditions contain rules about posting comments. By submitting a comment, you are declaring that you agree with these rules:
- Although the administrator will attempt to moderate comments, it is impossible for every comment to have been moderated at any given time.
- You acknowledge that all comments express the views and opinions of the original author and not those of the administrator.
- You agree not to post any material which is knowingly false, obscene, hateful, threatening, harassing or invasive of a person's privacy.
- The administrator has the right to edit, move or remove any comment for any reason and without notice.
Failure to comply with these rules may result in being banned from submitting further comments.
These terms and conditions are subject to change at any time and without notice.
- Data Science
- React Native
- Cloud Computing
- Java Beans
- Mac OS X
- Office 365
- Tech Reviews
Step by Step Hibernate - Your First Hibernate Application
A sample Hibernate Web Application using Servlets
Programmatic configuration in Hibernate
Tutorial Using the Java Persistence API (JPA) in Hibernate
Primary keys assigned by triggers in Hibernate
Assigned identifiers in Hibernate
Identity columns and sequences in Hibernate
EntityNameResolvers in Hibernate
Tuplizers (org.hibernate.tuple.Tuplizer) in Hibernate
equals() and hashCode() in Hibernate
Fetching strategies in Hibernate
Hibernate Configuration Properties