I have the following tables:
The following classes:
Code:
public class Parent {
private int id;
private Set<Child> children;
// getters and setters
}
public class Child {
private int id;
private String attr;
// getters and setters
public int hashCode() {
return this.getId();
}
public boolean equals(Object obj) {
return obj instanceof Child && this.getId() == ((Child)obj).getId();
}
}
And the following Hibernate mapping:
Code:
<class name="Parent" table="parent">
<id name="id" column="id"/>
<set name="children" table="child">
<key column="id_parent"/>
<composite-element class="Child">
<property name="id" column="id"/>
<property name="attr" column="attr"/>
</composite-element>
</set>
</class>
Whenever I change
attr attribute from a
Child or add/remove a
Child to/from the collection and commit the transaction, the entire collection is deleted and the remaining children are reinserted with the new attribute values.
Is this because I'm using an entity (
Parent) and a component class (
Child) instead of using two entities in a one-to-many relationship?
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