Spring data JPA entity update mechanism with database

Question

A {
  @OneToMany(cascade = CascadeType.ALL)
  List<B> listB;
}

Suppose A has a list of B, if I update A using A.setListB(anotherList) , items in the original listB are still in the database, what should I do to automatically delete items B which are not in the new listB when I update A?

Answer 1

尝试在注释上使用orphanRemoval=true

Answer 2

With JPA, you typically do not reassign list/collection variables, as this leads to errors. This is due to the JPA provider "tracking" the collections when you load an object from the database. Rather, you should do this:

listB.clear();
listB.addAll(otherList);

Combined with orphanRemoval=true as suggested by the other answer, it should behave the way that you wish it to.