7.5. Bidirectional associations with join tables
7.5.1. one-to-many / many-to-one
The following is an example of a bidirectional one-to-many association on a join table. The
inverse="true"
can go on either end of the association, on the collection, or on the join.
<class name="Person"> <id name="id" column="personId"> <generator class="native"/> </id> <set name="addresses" table="PersonAddress"> <key column="personId"/> <many-to-many column="addressId" unique="true" class="Address"/> </set> </class> <class name="Address"> <id name="id" column="addressId"> <generator class="native"/> </id> <join table="PersonAddress" inverse="true" optional="true"> <key column="addressId"/> <many-to-one name="person" column="personId" not-null="true"/> </join> </class>
create table Person ( personId bigint not null primary key ) create table PersonAddress ( personId bigint not null, addressId bigint not null primary key ) create table Address ( addressId bigint not null primary key )