CODEWITHSUNDEEP
javahibernatejpa
Ilya
Ilya

Reputation: 29673

Hibernate: Cascade Type

Let's I have entity A and entity B. Entity A have @OneToOne relationship with B.
I want do next:
if I remove A then B must be removed also.
If I remove B then A isn't removed.

In which entity I must set 

@OneToOne(cascade = {CascadeType.MERGE, CascadeType.PERSIST, CascadeType.REFRESH})

and in which side I must set

@OneToOne(cascade = {CascadeType.ALL})

?

Upvotes: 17

Views: 47350

Answers (3)

Vipul
Vipul

Reputation: 836

If Class A has Class B then CascadeType.ALL will be appiled on B. then 

Public Class A
{
  Private B b;
  @OneToOne(cascade = CascadeType.ALL)   
  public B getB() {       
    return this.b;   
   }     
  public void B(B b) {         
    this.b = b;   
  }
}

for more read this example

Upvotes: 0

Lukazoid
Lukazoid

Reputation: 19416

The cascade from A to B should be placed on the field referencing B in class A, the cascade from B to A should be placed on the field referencing A in class B.

public class A {
    @OneToOne(cascade = {CascadeType.ALL})
    B b;
}

Should be in class A, as you want every action to be cascaded to B.

public class B {
    @OneToOne(cascade = {CascadeType.MERGE, CascadeType.PERSIST, CascadeType.REFRESH})
    A a;
}

Should be in class B, as you only want certain actions cascaded to A

Upvotes: 33

heikkim
heikkim

Reputation: 2975

if A "has" B, then you must define CascadeType.ALL in A:

public class A {
  // changes to A cascade to B
  @OneToOne(cascade = {CascadeType.ALL})
  B b
}

Upvotes: 3

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