What is CascadeType remove?

What is CascadeType remove?

The cascade remove is used to specify that if the parent entity is removed then all its related entities will also be removed. The following syntax is used to perform cascade remove operation: – @OneToOne(cascade=CascadeType.REMOVE)

What is CascadeType persist?

The cascade persist is used to specify that if an entity is persisted then all its associated child entities will also be persisted. The following syntax is used to perform cascade persist operation: – @OneToOne(cascade=CascadeType.PERSIST)

Should we use cascade delete?

2 Answers. ON DELETE CASCADE is fine, but only when the dependent rows are really a logical extension of the row being deleted. For example, it’s OK for DELETE ORDERS to delete the associated ORDER_LINES because clearly you want to delete this order, which consists of a header and some lines.

What is CascadeType merge?

In Hibernate CascadeType. MERGE plays the role when more than one entity is associated to each other. CascadeType. MERGE cascades the merge operation to all associated entities merge. If one entity is merged, other associated entities will also be merged in case CascadeType.

How to delete child entities before parent with Entity Framework?

Cascade delete in Entity framework is tricky thing, as you need to be sure about deletion entity object graph.It is better to always write a integration test for these cascade deletes. If you try to delete parent entity in EF, it will try to execute delete statements for any child entities in current dbcontext.

When to delete a dependent / child entity in Cascade?

Both result in deleting dependent/child entities when the relationship to their required principal/parent is severed. For cascade delete, this severing happens because the principal/parent is itself deleted. For orphans, the principal/parent entity still exists, but is no longer related to the dependent/child entities.

Can a hibernate automatically delete a child entity?

Can Hibernate automatically delete the child entity if I remove its association to the parent? Yes, the JPA specification provides the orphanRemoval feature for these use cases. When you activate it on the association, Hibernate removes a child entity when you remove its association to the parent entity.

What happens when a parent entity is deleted?

This entity’s foreign key value must match the primary key value (or an alternate key value) of the related principal/parent entity. If the principal/parent entity is deleted, then the foreign key values of the dependents/children will no longer match the primary or alternate key of any principal/parent.