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EclipseLink/UserGuide/JPA/Advanced JPA Development/Schema Generation/CascadeOnDelete
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Revision as of 14:25, 31 January 2011 by Unnamed Poltroon (Talk)
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Key API CascadeOnDelete
@CascadeOnDelete
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ON DELETE CASCADE is a database foreign key constraint option that automatically removes the dependent rows.
Use the @CascadeOnDelete annotation or the cascadeOnDelete property to specify that a delete operation performed on a database object is cascaded on secondary or related tables.
'On this..." | CascadeOnDelete does this... |
Entity | Defines that secondary or joined inheritance tables should cascade the delete on the database |
OneToOne mapping | The related object is deleted cascaded on the database. This is only allowed for mappedBy/target-foriegn key OneToOne mappings (because of constraint direction). |
OneToMany mapping | The related objects are deleted cascaded on the database. |
ManyToMany mapping | The join table is deleted cascaded on the database (target objects cannot be cascade even if private because of constraint direction). |
DirectCollection | The direct table is deleted cascaded on the database. |
AggregateCollection | The aggregate table is deleted cascaded on the database. |
@Target(value={METHOD,FIELD,TYPE}) @Retention(value=RUNTIME) public @interface CascadeOnDelete
Config files
In the orm.xml descriptor file, specify cascade on delete as follows:
<entity cascadeOnDelete="true"> <one-to-one cascadeOnDelete="true"> <one-to-many cascadeOnDelete="true"> <many-to-many cascadeOnDelete="true">