[转]hibernate-xml配置模板

【Group.hbm.xml文件如下：】

<hibernate-mapping>

<classname="com.dragon.hibernate.Group"table="t_group">

<idname="id">

<generatorclass="native"/>

</id>

<propertyname="name"/>

</class>

</hibernate-mapping>

【User.hbm.xml文件如下：】

<hibernate-mapping>

<classname="com.dragon.hibernate.User"table="t_user">

<idname="id">

<generatorclass="native"/>

</id>

<propertyname="name"/>

<many-to-onename="group"column="groupid"/>

</class>

</hibernate-mapping>

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2．多对多双向映射（User<-Role）

【User.hbm.xml文件如下】

<hibernate-mapping>

<classname="com.dragon.hibernate.User"table="t_user">

<idname="id">

<generatorclass="native"/>

</id>

<propertyname="name"/>

<setname="roles"table="t_user_role">

<keycolumn="userid"/>

<many-to-manyclass="com.dragon.hibernate.Role"column="roleid"/>

</set>

</class>

</hibernate-mapping>

【Role.hbm.xml文件如下】

<hibernate-mapping>

<classname="com.dragon.hibernate.Role"table="t_role">

<idname="id">

<generatorclass="native"/>

</id>

<propertyname="name"/>

<setname="users"table="t_user_role">

<keycolumn="roleid"/>

<many-to-manyclass="com.dragon.hibernate.User"column="userid"/>

</set>

</class>

</hibernate-mapping>

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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】

<hibernate-mapping>

<classname="com.dragon.hibernate.Role"table="t_role">

<idname="id">

<generatorclass="native"/>

</id>

<propertyname="name"/>

</class>

</hibernate-mapping>

【User.hbm.xml文件如下】

<hibernate-mapping>

<classname="com.dragon.hibernate.User"table="t_user">

<idname="id">

<generatorclass="native"/>

</id>

<propertyname="name"/>

<setname="roles"table="t_user_role">

<keycolumn="userid"/>

<many-to-manyclass="com.dragon.hibernate.Role"column="roleid"/>

</set>

</class>

</hibernate-mapping>

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4.一对一主键双向（Person?->IdCard）

【Person.hbm.xml文件如下】

<hibernate-mapping>

<classname="com.dragon.hibernate.Person"table="t_person">

<idname="id">

<generatorclass="foreign">

<paramname="property">idcard</param>

</generator>

</id>

<propertyname="name"/>

<one-to-onename="idcard"constrained="true"/>

</class>

</hibernate-mapping>

【Idcard.hbm.xml文件如下】

<hibernate-mapping>

<classname="com.dragon.hibernate.IdCard"table="t_idcard">

<idname="id">

<generatorclass="native"/>

</id>

<propertyname="idno"/>

<one-to-onename="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。

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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：

<hibernate-mapping>

<classname="com.dragon.hibernate.IdCard"table="t_idcard">

<idname="id">

<generatorclass="native"/>

</id>

<propertyname="idno"/>

</class>

</hibernate-mapping>

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

6.一对一外键单向（Person-->IdCard）

IdCard.hbm.xml文件如下：

<hibernate-mapping>

<classname="com.dragon.hibernate.IdCard"table="t_idcard">

<idname="id">

<generatorclass="native"/>

</id>

<propertyname="idno"/>

</class>

</hibernate-mapping>

Person.hbm.xml文件如下：

<hibernate-mapping>

<classname="com.dragon.hibernate.Person"table="t_person">

<idname="id">

<generatorclass="native"/>

</id>

<propertyname="name"/>

<many-to-onename="idcard"column="idcardid"unique="true"/>

</class>

</hibernate-mapping>

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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：

<hibernate-mapping>

<classname="com.dragon.hibernate.IdCard"table="t_idcard">

<idname="id">

<generatorclass="native"/>

</id>

<propertyname="name"/>

<one-to-onename="person"proper-ref=“idcard”/>

</class>

</hibernate-mapping>

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8.一对多单向（Group-->User）

注意，在key中的外键<keycolumn="groupid"/>要一致不然要生成中间表

【Group.hbm.xml文件如下】

<hibernate-mappingpackage="com.dragon.hibernate">

<classname="Group"table="t_group">

<idname="id">

<generatorclass="native"/>

</id>

<propertyname="name"/>

<setname="users">

<keycolumn="groupid"/>

<one-to-manyclass="User"/>

</set>

</class>

</hibernate-mapping>

【User.hbm.xml文件如下】

<hibernate-mapping>

<classname="com.dragon.hibernate.User"table="t_user">

<idname="id">

<generatorclass="native"/>

</id>

<propertyname="name"/>

</class>

</hibernate-mapping>

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9.一对多双向（Group<-->User）

【Group.hbm.xml文件如下】

<hibernate-mappingpackage="com.dragon.hibernate">

<classname="Group"table="t_group">

<idname="id">

<generatorclass="native"/>

</id>

<propertyname="name"/>

<setname="users"cascade="all">

<keycolumn="groupid"/>

<one-to-manyclass="User"/>

</set>

</class>

</hibernate-mapping>

【User.hbm.xml文件如下：】

<hibernate-mapping>

<classname="com.dragon.hibernate.User"table="t_user">

<idname="id">

<generatorclass="native"/>

</id>

<propertyname="name"/>

<many-to-onename="groups"column="groupid"/>

</class>

</hibernate-mapping>

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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：

<hibernate-mappingpackage="com.dragon.hibernate">

<classname="Animal"table="t_extends">

<idname="id">

<generatorclass="native"/>

</id>

<discriminatorcolumn="type"type="string"/>

<propertyname="name"/>

<propertyname="sex"/>

<subclassname="Pig"discriminator-value="P">

<propertyname="weight"/>

</subclass>

<subclassname="Bird"discriminator-value="B">

<propertyname="height"/>

</subclass>

</class>

</hibernate-mapping>

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11.继承映射（Pig和Bird继承Animal）--每个具体类映射成一张表joined-classs

extends.hbm.xml文件如下：

<hibernate-mappingpackage="com.dragon.hibernate">

<classname="Animal"table="t_animal">

<idname="id">

<generatorclass="native"/>

</id>

<propertyname="name"/>

<propertyname="sex"/>

<joined-subclassname="Pig"table="t_pig">

<keycolumn="pid"/>

<propertyname="weight"></property>

</joined-subclass>

<joined-subclassname="Bird"table="t_bird">

<keycolumn="bid"/>

<propertyname="height"></property>

</joined-subclass>

</class>

</hibernate-mapping>

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12.继承映射（Pig和Bird继承Animal）--每个子类类映射成一张表union-subclass

extends.hbm.xml文件如下：

<hibernate-mappingpackage="com.dragon.hibernate">

<classname="Animal"table="t_animal">

<idname="id">

<generatorclass="uuid"/>

</id>

<propertyname="name"/>

<propertyname="sex"/>

<union-subclassname="Pig"table="t_pig">

<propertyname="weight"/>

</union-subclass>

<union-subclassname="Bird"table="t_bird">

<propertyname="height"/>

</union-subclass>

</class>

</hibernate-mapping>

**注释在使用<idname="id">

<generatorclass="uuid"/>

</id>是不能将<generatorclass="uuid"/>改写成<generatorclass="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<classname="Animal"table="t_animal">中添加Abstract="true"可以使hibernate不生成表t_animal

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13.component映射

component.hbm.xml文件如下：

<hibernate-mapping>

<classname="com.bjsxt.hibernate.User"table="t_user">

<idname="id">

<generatorclass="native"/>

</id>

<propertyname="name"/>

<componentname="contact">

<propertyname="email"/>

<propertyname="address"/>

<propertyname="zipCode"/>

<propertyname="contactTel"/>

</component>

</class>

</hibernate-mapping>

User类中有以下属性：

privateintid;

privateStringname;

privateContactcontact;它不再是一种引用了

14.Set,Map,Arrary[],List映射

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CollectionMapping.hbm.xml文件如下：

<hibernate-mapping>

<classname="com.bjsxt.hibernate.CollectionMapping"table="t_CollectionMapping">

<idname="id">

<generatorclass="native"/>

</id>

<propertyname="name"/>

<setname="setValue"table="t_set_value">

<keycolumn="set_id"/>

<elementtype="string"column="set_value"/>

</set>

<listname="listValue"table="t_list_value">

<keycolumn="list_id"/>

<list-indexcolumn="list_index"/>

<elementtype="string"column="list_value"/>

</list>

<arrayname="arrayValue"table="t_array_value">

<keycolumn="array_id"/>

<list-indexcolumn="array_index"/>

<elementtype="string"column="array_value"/>

</array>

<mapname="mapValue"table="t_map_value">

<keycolumn="map_id"/>

<map-keytype="string"column="map_key"/>

<elementtype="string"column="map_value"/>

</map>

</class>

</hibernate-mapping>