Inheritance Mapping We can map the inheritance hierarchy classes with the table of the database. There are several inheritance mapping strategies defined in the JPA specification : MappedSuperclass : the parent classes, can’t be entities Single Table : the entities from different classes with a common ancestor are placed in a single table Joined Table : […]
What Is Cascading ? Entity relationships often depend on the existence of another entity. Cascading is the way to achieve this. When we perform some action on the target entity, the same action will be applied to the associated entity. JPA Cascade Type All JPA-specific cascade operations are represented by the javax.persistence.CascadeType enum containing entries: ALL […]
JPA ASSOCIATIONS : Il existe plusieurs type d’associations entre entités :• One to One (1:1) -Unidirectionnelle / Bidirectionnelle• One to Many (1:N) -Unidirectionnelle / Bidirectionnelle• Many to One (N:1) -Unidirectionnelle / Bidirectionnelle• Many to Many (N:M) -Unidirectionnelle / Bidirectionnelle– TP : Mise en oeuvre des différentes associations JPA ASSOCIATIONS : • One To One entre […]
Why in “One to Many” Mapping hibernate data is getting inserted in child table while updating parent table ? Solution : You are using cascade = CascadeType.ALL in both @OneToMany mappings of your Sets. This means that whatever operation done on the parent entity, will be propagate also to the child entity That is when […]