Web hosting compare - CHAPTER 12 Modifying objects efficiently Table 12.1 Hibernate
CHAPTER 12 Modifying objects efficiently Table 12.1 Hibernate and Java Persistence entity association cascading options (continued) all javax.persistence.CascadeType.ALL This setting includes and enables all cascading options listed previously. XML attribute Annotation Description delete- orphan org.hibernate.annotations.CascadeType.DELETE_ORPHAN This extra and special setting enables deletion of associated objects when they re removed from the association, that is, from a collection. If you enable this setting on an entity collection, you re telling Hibernate that the associated objects don t have shared references and can be safely deleted when a reference is removed from the collection. cascade attribute. The delete-orphan setting, however, is applicable only to collections. Obviously, you never have to enable transitive persistence for a collection that references value-typed classes here the lifecycle of the associated objects is dependent and implicit. Fine-grained control of dependent lifecycle is relevant and available only for associations between entities. FAQ What is the relationship between cascade and inverse? There is no relationship; both are different notions. The noninverse end of an association is used to generate the SQL statements that manage the association in the database (insertion and update of the foreign key column(s)). Cascading enables transitive object state changes across entity class associations. Here are a few examples of cascading options in XML mapping files. Note that this code isn t from a single entity mapping or a single class, but only illustrative:
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