hibernate 各种映射的配置文件总结

1．多对一单向映射（User-Group） 

Group.hbm.xml文件如下： 

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="com.dragon.hibernate.Group" table="t_group">
<id name="id">
<generator class="native"/>
</id>
<property name="name"/>
</class>
</hibernate-mapping>

User.hbm.xml文件如下： 

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="com.dragon.hibernate.User" table="t_user">
<id name="id">
<generator class="native"/>
</id>
<property name="name"/>
<property name="password"/>
<property name="createTime"/>
<many-to-one name="group" column="groupid"/>
</class>
</hibernate-mapping>

2．多对多双向映射（User<-Role）

User.hbm.xml文件如下： 

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="com.dragon.hibernate.User" table="t_user">
<id name="id">
<generator class="native"/>
</id>
<property name="name"/>
<property name="password"/>
<property name="createTime"/>
<set name="roles" table="t_user_role">
<key column="userid"/>
<many-to-many class="com.dragon.hibernate.Role" column="roleid"/>
</set>
</class>
</hibernate-mapping>

Role.hbm.xml文件如下： 

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="com.dragon.hibernate.Role" table="t_role">
<id name="id">
<generator class="native"/>
</id>
<property name="name"/>
<set name="users" table="t_user_role">
<key column="roleid"/>
<many-to-many class="com.dragon.hibernate.User" column="userid"/>
</set>
</class>
</hibernate-mapping>

3.多对多单向映射（User<-Role）

在User端使用set 引用role 维持关系，则User.hbm.xml文件同上面的双向一样，只有Role.hbm.xml文件稍微有所小小的不同，比双向更简单。

Role.hbm.xml文件如下： 

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="com.dragon.hibernate.Role" table="t_role">
<id name="id">
<generator class="native"/>
</id>
<property name="name"/>
</class>
</hibernate-mapping>

4.一对一主键双向（Person?-> IdCard）

Person.hbm.xml文件如下： 

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="com.dragon.hibernate.Person" table="t_person">
<id name="id">
<generator class="foreign">
<param name="property"> idcard</param>
</generator>
</id>
<property name="name"/>
<one-to-one name="idcard" constrained="true"/>
</class>
</hibernate-mapping>

Idcard.hbm.xml文件如下： 

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="com.dragon.hibernate.IdCard" table="t_idcard">
<id name="id">
<generator class="native"/>
</id>
<property name="idno"/>
<one-to-one name="person"> </one-to-one>
</class>
</hibernate-mapping>

One-to-one标签指示hibernate如何加载关联对象，默认是根据主键加载；

constrained="true"表示当前主键存在一个约束，person的主键作为外键参照idcard。 

5.一对一主键单向（Person--> IdCard） 

Person.hbm.xml文件如下相同

Idcard.hbm.xml文件如下： 

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="com.dragon.hibernate.IdCard" table="t_idcard">
<id name="id">
<generator class="native"/>
</id>
<property name="idno"/>
</class>
</hibernate-mapping>

与双向的只是少了这句<one-to-one name="person"> </one-to-one> 

6.一对一外键单向（Person--> IdCard）

IdCard.hbm.xml文件如下： 

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="com.dragon.hibernate.IdCard" table="t_idcard">
<id name="id">
<generator class="native"/>
</id>
<property name="idno"/>
</class>
</hibernate-mapping>

Person.hbm.xml文件如下： 

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="com.dragon.hibernate.Person" table="t_person">
<id name="id">
<generator class="native"/>
</id>
<property name="name"/>
<many-to-one name="idcard" column="idcardid" unique="true"/>
</class>
</hibernate-mapping>

7.一对一外键双向（Person<--> IdCard）

Person.hbm.xml文件与单向一样

IdCard.hbm.xml文件如下： 

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="com.dragon.hibernate.Person" table="t_person">
<id name="id">
<generator class="native"/>
</id>
<property name="name"/>
<one-to-one name="person" proper-ref=“idcard”/>
</class>
</hibernate-mapping>

8.一对多单向（Group--> User）

Group.hbm.xml文件如下： 

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="com.dragon.hibernate">
<class name="Group" table="t_group">
<id name="id">
<generator class="native"/>
</id>
<property name="name"/>
<set name="users">
<key column="groupid"/>
<one-to-many class="User"/>
</set>
</class>
</hibernate-mapping>

User.hbm.xml文件如下： 

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="com.dragon.hibernate.User" table="t_user">
<id name="id">
<generator class="native"/>
</id>
<property name="name"/>
</class>
</hibernate-mapping>

9.一对多双向（Group<--> User）

Group.hbm.xml文件如下： 

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="com.dragon.hibernate">
<class name="Group" table="t_group">
<id name="id">
<generator class="native"/>
</id>
<property name="name"/>
<set name="users" cascade="all">
<key column="groupid"/>
<one-to-many class="User"/>
</set>
</class>
</hibernate-mapping>

User.hbm.xml文件如下： 

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="com.dragon.hibernate.User" table="t_user">
<id name="id">
<generator class="native"/>
</id>
<property name="name"/>
<many-to-one name="groups" column="groupid"/>
</class>
</hibernate-mapping>

10.继承映射（Pig和Bird 继承Animal）

--一棵继承树映射成一张表

extends.hbm.xml文件如下： 

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="com.dragon.hibernate">
<class name="Animal" table="t_extends">
<id name="id">
<generator class="native"/>
</id>
<discriminator column="type" type="string"/>
<property name="name"/>
<property name="sex"/>
<subclass name="Pig" discriminator-value="P">
<property name="weight"/>
</subclass>
<subclass name="Bird" discriminator-value="B">
<property name="height"/>
</subclass>
</class>
</hibernate-mapping>

11.继承映射（Pig和Bird 继承Animal）

--每个具体类映射成一张表

extends.hbm.xml文件如下： 

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="com.dragon.hibernate">
<class name="Animal" table="t_animal">
<id name="id">
<generator class="native"/>
</id>
<property name="name"/>
<property name="sex"/>
<joined-subclass name="Pig" table="t_pig">
<key column="pid"/>
<property name="weight"> </property>
</joined-subclass>
<joined-subclass name="Bird" table="t_bird">
<key column="bid"/>
<property name="height"> </property>
</joined-subclass>
</class>
</hibernate-mapping>

12.继承映射（Pig和Bird 继承Animal）

--每个子类类映射成一张表

extends.hbm.xml文件如下： 

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="com.dragon.hibernate">
<class name="Animal" table="t_animal">
<id name="id">
<generator class="uuid"/>
</id>
<property name="name"/>
<property name="sex"/>
<union-subclass name="Pig" table="t_pig">
<property name="weight"/>
</union-subclass>
<union-subclass name="Bird" table="t_bird">
<property name="height"/>
</union-subclass>
</class>
</hibernate-mapping>

**注释在使用<id name="id">

<generator class="uuid"/>

</id> 是不能将<generator class="uuid"/> 改写成<generator class="native"/> ，不然会出错。相应的Animal类中的id字段类型也要该为String.

如果在<class name="Animal" table="t_animal"> 中添加Abstract="true"可以使hibernate不生成表t_animal

13. component映射

component.hbm.xml文件如下： 

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="com.bjsxt.hibernate.User" table="t_user">
<id name="id">
<generator class="native"/>
</id>
<property name="name"/>
<component name="contact">
<property name="email"/>
<property name="address"/>
<property name="zipCode"/>
<property name="contactTel"/>
</component>
</class>
</hibernate-mapping>

User类中有以下属性：

private int id;

private String name;

private Contact contact;它不再是一种引用了 

14. Set,Map,Arrary[],List映射

CollectionMapping.hbm.xml文件如下： 

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="com.bjsxt.hibernate.CollectionMapping" table="t_CollectionMapping">
<id name="id">
<generator class="native"/>
</id>
<property name="name"/>
<set name="setValue" table="t_set_value">
<key column="set_id"/>
<element type="string" column="set_value"/>
</set>
<list name="listValue" table="t_list_value">
<key column="list_id"/>
<list-index column="list_index"/>
<element type="string" column="list_value"/>
</list>
<array name="arrayValue" table="t_array_value">
<key column="array_id"/>
<list-index column="array_index"/>
<element type="string" column="array_value"/>
</array>
<map name="mapValue" table="t_map_value">
<key column="map_id"/>
<map-key type="string" column="map_key"/>
<element type="string" column="map_value"/>
</map>
</class>
</hibernate-mapping>