Hibernate Criteria, Hibernate Query, Hibernate, Example, Code, Tutorial, Article

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Tags/Keywords : Hibernate Criteria, Hibernate Query, Hibernate, Example, Code, Tutorial, Article
Author : Amit
Date (Year/Month/Date): 2009-05-25 Question on Hibernate Criteria Suppose there is a one to many mapping between person and role. While quering Person based on certain role, if a filter criteria is required based on role only, Is there any ways one can do such mapping with some filter criteria?? Or any other ways of doing Hibernate Query criteria on dependent objects?? Let me discuss this scenario with this example, A person can have many roles such as Manager, Assistant manager, general manager, secretary, Architect etc. So when this person object is queried, then roles to be queried should have Manager roles only, like Manager, Assistant manager, general manager and not Secretary and Achitect. One way it can be by providing a Hibernate named query and other way could be by creating Hibernate Criteria and providing appropriate Restrictions in Java code. Can someone take this as a task and complete this example with a very simple example on Hibernate Criteria and publish this Hibernate Criteria example in this Page? As we are discussing about using filters with Hibernate Entities, then one can look more towards the Hibernate Filters, such as <filter-def> Tag in Hibernate mapping file. It can be used along with a class Tag and/or with collection tags as well. This <filter-def> tag can use parameters begining with : and these parameters can be used in code to set values. Session has method enableFilter(FILTER_NAME) to get Filter object. All parameters value can be set on this Filter object, in order to provide a filter criteria to the mapping. To the best of my understanding, using Hibernate to form query based on certain filter criterias, one can use Hibernate Session api, methods like

createCriteria(ENTITY_NAME) to get a Criteria, and work with Restrictions to come up with query filter requirements

createQuery(QUERY_NAME) to get a Query and work to set appropriate values to parameters and then executeUpdate or list all the results of this query.

getNamedQuery(QUERY_NAME) to get Query as defined in HBM mapping file, to be executed to retrieve appropriate values from Resultset.

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