Hibernate / Hibernate Caching
Explain collection cache in Hibernate.
Second Level Cache caches entities. Also, the second level cache also allows users to cache entity relationship information. Hibernate provides a collection cache, where it caches the primary keys of entities that are members of a collection field in another entity type. Say, for example, we have two entity types, Book and Auther, where an Auther participates in a many-to-one relationship with a Book.
import javax.persistence.*; import org.hibernate.annotations.Cache; import org.hibernate.annotations.CacheConcurrencyStrategy; @Entity @Cache(usage=CacheConcurrencyStrategy.TRANSACTIONAL) public class Book{ @Id private Integer id; private String name; @Cache (usage=CacheConcurrencyStrategy.TRANSACTIONAL) @OneToMany(mappedBy="auther", fetch=FetchType.EAGER, cascade=CascadeType.ALL) private Set authers; ..... }
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