Hibernate 实体关联关系映射----总结

最新推荐文章于 2025-08-08 23:05:48 发布

iteye_21328

最新推荐文章于 2025-08-08 23:05:48 发布

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分类专栏： SSH 文章标签： Hibernate .net XML

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本文介绍了Hibernate框架下各种类型的关联关系映射配置方法，包括一对一、一对多、多对多等关联方式，并提供了详细的XML配置示例。

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Hibernate关联关系映射目录
│
├─单向关联
│ ├─ 一对一外键单向关联
│ ├─ 一对一主键单向关联
│ ├─ 一对一连接表单向关联
│ ├─ 一对多外键单向关联
│ ├─ 一对多连接表单向关联
│ ├─ 多对一外键单向关联
│ ├─ 多对一连接表单向关联
│ └─ 多对多单向关联
└─双向关联
    ├─ 一对一外键双向关联
    ├─ 一对一主键双向关联
    ├─ 一对一连接表双向关联
    ├─ 一对多外键双向关联
    ├─ 一对多连接表双向关联
    └─ 多对多双向关联

Hibernate 一对一外键单向关联

<hibernate-mapping> 
        <class name="com.lavasoft.dx._1_1_fk.Person11fk" table="PERSON_11fk"> 
                <id name="personid"> 
                        <generator class="identity"/> 
                </id> 
                <property name="name"/> 
                <property name="age"/> 
                <!--用来映射关联PO column是Address在该表中的外键列名,增加unique变成“1-1”--> 
                <many-to-one name="address11fk" column="addressId" unique="true"/> 
        </class> 
</hibernate-mapping>

Hibernate 多对多单向关联

<hibernate-mapping> 
    <class name="com.lavasoft.dx._n_n.Personnn" table="PERSON_nn"> 
        <id name="personid"> 
            <generator class="identity"/> 
        </id> 
        <property name="name"/> 
        <property name="age"/> 
        <!--映射集合属性，join_1ntab是连接表表名--> 
        <set name="addresses" 
             table="join_nn" 
                > 
            <!--“column="personid"”确定PERSON_1ntab表关联到连接表的外键列名--> 
            <key column="personid"/> 
            <!--“column="addressid"”关联PERSON_1ntab表的Address1ntab对象的id在连接表中的列名--> 
            <many-to-many 
                    column="addressid" 
                    class="com.lavasoft.dx._n_n.Addressnn"/> 
        </set> 
    </class> 
</hibernate-mapping>

Hibernate 一对一外键双向关联

<?xml version="1.0" encoding="utf-8"?> 
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" 
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"> 

<hibernate-mapping> 
  <class name="entity.Person" table="person"> 
    <id name="id" type="java.lang.Long"> 
      <column name="id" /> 
      <generator class="identity" /> 
    </id> 
    <property name="name" type="java.lang.String"> 
      <column name="name" length="24" not-null="true"> 
        <comment>姓名</comment> 
      </column> 
    </property> 
    <one-to-one name="address" cascade="all" /> 
  </class> 
</hibernate-mapping>

<?xml version="1.0" encoding="utf-8"?> 
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" 
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"> 

<hibernate-mapping> 
  <class name="entity.Address" table="address" catalog="testdb"> 
    <id name="id" type="java.lang.Long"> 
      <column name="id" /> 
      <generator class="identity" /> 
    </id> 
    <property name="detail" type="java.lang.String"> 
      <column name="detail" length="120" not-null="true"> 
        <comment>详细地址</comment> 
      </column> 
    </property> 
    <many-to-one name="person" class="entity.Person" 
      fetch="select" unique="true"> 
      <column name="personid"> 
        <comment>人的ID</comment> 
      </column> 
    </many-to-one> 
  </class> 
</hibernate-mapping>

Hibernate 一对一主键双向关联

<?xml version="1.0" encoding="utf-8"?> 
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" 
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"> 

<hibernate-mapping> 
  <class name="entity.Person" table="person"> 
    <id name="id" type="java.lang.Long"> 
      <column name="id" /> 
      <generator class="identity" /> 
    </id> 
    <property name="name" type="java.lang.String"> 
      <column name="name" length="24" not-null="true"> 
        <comment>姓名</comment> 
      </column> 
    </property> 
    <!-- cascade="all"：在保存person对象的时候，级联保存person对象关联的address对象    --> 
    <one-to-one name="address" cascade="all" /> 
  </class> 
</hibernate-mapping>

<?xml version="1.0" encoding="utf-8"?> 
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" 
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"> 

<hibernate-mapping> 
  <class name="entity.Address" table="address" catalog="mydb"> 
    <id name="id" type="java.lang.Long"> 
      <column name="id" /> 
      <!-- class="foreign": 一对一主键映射中，使用另外一个相关联的对象的标识符 --> 
      <generator class="foreign"> 
        <param name="property">person</param> 
      </generator> 
    </id> 
    <property name="detail" type="java.lang.String"> 
      <column name="detail" length="120" not-null="true"> 
        <comment>详细地址</comment> 
      </column> 
    </property> 
    <!-- 表示在address表存在一个外键约束，外键参考相关联的表person --> 
    <one-to-one name="person" constrained="true" /> 
  </class> 
</hibernate-mapping>

Hibernate 一对一连接表双向关联

<hibernate-mapping> 
    <class name="com.lavasoft.sx._1_1_tab.Person11tab_sx" table="PERSON_11tab_sx"> 
        <id name="personid"> 
            <generator class="identity"/> 
        </id> 
        <property name="name"/> 
        <property name="age"/> 
        <join table="join_11tab_sx" 
              optional="true"> 
            <key column="personid" 
                 unique="true"/> 
            <many-to-one name="address11tab_sx" 
                         column="addressid" 
                         not-null="true" 
                         unique="true"/> 
        </join> 
    </class> 
</hibernate-mapping>

<hibernate-mapping> 
    <class name="com.lavasoft.sx._1_1_tab.Address11tab_sx" table="ADDRESS_11tab_sx"> 
        <id name="addressid"> 
            <generator class="identity"/> 
        </id> 
        <property name="addressdetail"/> 
        <join table="join_11tab_sx" 
              optional="true" 
              inverse="true"> 
            <key column="addressid" 
                 unique="true"/> 
            <many-to-one name="person11tab_sx" column="personid" 
                         not-null="true" unique="true"/> 
        </join> 
    </class> 
</hibernate-mapping>

Hibernate 一对多外键双向关联

hibernate-mapping> 
    <class name="com.lavasoft.sx._1_n_fk.Person1nfk_sx" table="PERSON_1nfk_sx"> 
        <id name="personid"> 
            <generator class="identity"/> 
        </id> 
        <property name="name"/> 
        <property name="age"/> 
        <!--映射集合属性，关联到持久化类--> 
        <set name="addresses" inverse="true" cascade="all"> 
            <!--column用于指定外键列名--> 
            <key column="personid" not-null="true"/> 
            <!--映射关联类--> 
            <one-to-many class="com.lavasoft.sx._1_n_fk.Address1nfk_sx"/> 
        </set> 
    </class> 
</hibernate-mapping>

<hibernate-mapping> 
    <class name="com.lavasoft.sx._1_n_fk.Address1nfk_sx" table="ADDRESS_1nfk_sx"> 
        <id name="addressid"> 
            <generator class="identity"/> 
        </id> 
        <property name="addressdetail"/> 
        <!--映射关联属性，column属性指定外键列名--> 
        <many-to-one name="person1nfk" 
                     class="com.lavasoft.sx._1_n_fk.Person1nfk_sx" 
                     fetch="select" 
                     cascade="save-update"> 
            <column name="personid" not-null="true"/> 
        </many-to-one> 
    </class> 
</hibernate-mapping>

Hibernate 一对多连接表双向关联

<hibernate-mapping> 
    <class name="com.lavasoft.sx._1_n_tab.Person1ntab_sx" table="PERSON_1ntab_sx"> 
        <id name="personid"> 
            <generator class="identity"/> 
        </id> 
        <property name="name"/> 
        <property name="age"/> 
        <!--映射集合属性，关联到持久化类--> 
        <!--table="join_1ntab_sx"指定了连接表的名字--> 
        <set name="addresses" 
             table="join_1ntab_sx" 
             cascade="all"> 
            <!--column="personid"指定连接表中关联当前实体类的列名--> 
            <key column="personid" not-null="true"/> 
            <!--unique="true"表示当前实体类是"1",不是"n"--> 
            <many-to-many column="addressid" 
                          unique="true" 
                          class="com.lavasoft.sx._1_n_tab.Address1ntab_sx"/> 
        </set> 
    </class> 
</hibernate-mapping>

<hibernate-mapping> 
    <class name="com.lavasoft.sx._1_n_tab.Address1ntab_sx" 
           table="ADDRESS_1ntab_sx"> 
        <id name="addressid"> 
            <generator class="identity"/> 
        </id> 
        <property name="addressdetail"/> 
        <!--映射关联属性，column属性指定外键列名--> 
        <join   table="join_1ntab_sx" 
                inverse="true" 
              optional="true"> 
            <key column="addressid"/> 
            <many-to-one name="person1ntab_sx" 
                         column="personid" 
                         cascade="all" 
                         not-null="true"/> 
        </join> 
    </class> 
</hibernate-mapping>

Hibernate 多对多双向关联

<hibernate-mapping> 
    <class name="com.lavasoft.sx._n_n.Personnn_sx" table="PERSON_nn_sx"> 
        <id name="personid"> 
            <generator class="identity"/> 
        </id> 
        <property name="name"/> 
        <property name="age"/> 
        <!--映射集合属性，关联到持久化类--> 
        <!--table="join_1ntab_sx"指定了连接表的名字--> 
        <set name="addresses" 
             table="join_nn_sx" 
             cascade="all"> 
            <!--column="personid"指定连接表中关联当前实体类的列名--> 
            <key column="personid" not-null="true"/> 
            <!--column="addressid"是连接表中关联本实体的外键--> 
            <many-to-many column="addressid" 
                          class="com.lavasoft.sx._n_n.Addressnn_sx"/> 
        </set> 
    </class> 
</hibernate-mapping>

<hibernate-mapping> 
    <class name="com.lavasoft.sx._n_n.Addressnn_sx" 
           table="ADDRESS_nn_sx"> 
        <id name="addressid"> 
            <generator class="identity"/> 
        </id> 
        <property name="addressdetail"/> 
        <!--table="join_nn_sx"是双向多对多的连接表--> 
        <set name="persons" 
             inverse="true" 
             table="join_nn_sx"> 
            <!--column="addressid"是连接表中关联本实体的外键--> 
            <key column="addressid"/> 
            <many-to-many column="personid" 
                          class="com.lavasoft.sx._n_n.Personnn_sx"/> 
        </set> 
    </class> 
</hibernate-mapping>