JPA - How can i add ON DELETE CASCADE constraint ?

Question

I have a three tables.
1. A (name)
2. B (name)
and relationship(manytomany) table of A and B
3. C (a_name,b_name)
I am using 2 JPA entities@Entity
public class A {
     @id
     String name;
     @ManyToMany
     @JoinTable(name="C",
               joinColumns=@JoinColumn(name="a_name"),
               inverseJoinColumns=@JoinColumn(name="b_name"))
     private List<B> bs = new ArrayList<B>();
     //getter setter methos
}and@Entity
public class B {
     @id
     String name;
     @ManyToMany(mappedBy="bs")
     private List<A> as = new ArrayList<A>();
     //getter setter methos
}DDL of table C which is generated by JPA is something like thatCREATE TABLE C (
"a_name" VARCHAR,
"b_name" VARCHAR,
CONSTRAINT "c_a_name_fkey" FOREIGN KEY ("a_name")
REFERENCES a(name)
ON DELETE NO ACTION
ON UPDATE NO ACTION,
CONSTRAINT "c_b_name_fkey" FOREIGN KEY ("b_name")
REFERENCES b(name)
ON DELETE NO ACTION
ON UPDATE NO ACTION
)but i want to add constraint ON DELETE CASCADE* instead of ON DELETE NO ACTION_ in above relationship table C.
how can i do this ?
Thanks in advance.

Answer 1

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