<id name="userid" type="java.lang.Integer">
<column name="userid" />
<!-- 主键关联，将主键生成策略改为foreign，表明由关联类来生成主键，
即直接使用另外关联类的主键值，该实体类不能生成主键 -->
<generator class="foreign" />
<para name="property">address</para><!-- -->
</id>
<property name="name" type="java.lang.String">
<column name="name" length="12" />
</property>
<property name="password" type="java.lang.String">
<column name="password" length="16" />
</property>
<one-to-one name="address" class="Address" constrained="true"></one-to-one></span>
Addrss.hbm.xml文件配置
<id name="addressid" type="java.lang.Integer">
<column name="addressid" />
<generator class="identity" />
</id>
<property name="addressinfo" type="java.lang.String">
<column name="addressinfo" length="12" />
</property>
<!-- class属性：另外个实体类，将其的address属性映射为address表的外键address_id,
unique指定一对一映射
-->
<many-to-one name="address" class="Address" unique="true">
<!-- 外键 -->
<column name="address_id"></column>
</many-to-one>
private Set<Address> setAddress = new HashSet<Address>();
public Set<Address> getSetAddress() {
return setAddress;
}
public void setSetAddress(Set<Address> setAddress) {
this.setAddress = setAddress;
}
第二步：在Address.java表示一
private User user;
public User getUser() {
return user;
}
public void setUser(User user) {
this.user = user;
}
<!--set集合名称 -->
<!--hibernate机制，双向维护外键 columen 外键名称-->
<key column="user_address"></key>
<one-to-many class="Address全路径"/>
</set>
第五步：在多的配置文件（Address.hbm.xml）配置一的一方
<!--name属性 写address.java表示的user-->
<many-to-one name="user" class="User全路径" column="外键名"></many-to-one>
private Set<Role> setRole = new HashSet<Role>();
public Set<Role> getSetRole() {
return setRole;
}
public void setSetRole(Set<Role> setRole) {
this.setRole = setRole;
}
role.java表示user
private Set<User> setUser = new HashSet<User>();
public Set<User> getSetUser() {
return setUser;
}
public void setSetUser(Set<User> setUser) {
this.setUser = setUser;
}
<!--
name 角色set集合名称
table 第三张表的名称
-->
<set name="setRole" table="t_ub">
<!-- 配置当前映射文件在第三张表外键名称 -->
<key column="uid"></key>
<many-to-many class="路径" column="rid"></many-to-many>
</set>
role配置user
<!--
name 角色set集合名称
table 第三张表的名称
-->
<set name="setUser" table="t_ub">
<!-- 配置当前映射文件在第三张表外键名称 -->
<key column="bid"></key>
<many-to-many class="路径" column="uid"></many-to-many>
</set>
Hibernate学习笔记（3）---hibernate关联关系映射
原文：http://www.cnblogs.com/durui/p/7582281.html