Hibernate关联关系映射--2

2、基于连接表的单向多对一关联在关联关系可选的情况下应用也很普遍。链接表的主键为多端主键。?

<generator class="native"/>?

</id>?

</class>?

create table Person ( personId bigint not null primary key )?

create table PersonAddress ( personId bigint not null, addressId bigint not null, primary key (personId, addressId) )?

create table Address ( addressId bigint not null primary key )