hibernate one to one 映射到两种方式

最新推荐文章于 2025-11-29 09:26:02 发布

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#Hibernate #XML #Myeclipse #.net #SQL

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本文详细解析了使用MyEclipse Persistence Tools生成的数据库映射配置XML文件，包括Account、User、Address实体的映射规则及主键关联方式。

Account.hbm.xml<?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">
<!-- 
    Mapping file autogenerated by MyEclipse Persistence Tools
-->
<hibernate-mapping>
    <class name="com.hibernate.entity.Account" table="account" catalog="hibernate">
        <id name="accountId" type="java.lang.Long">
            <column name="ACCOUNT_ID" precision="10" scale="0" />
            <generator class="assigned" />
        </id>
        <property name="accountNumber" type="java.lang.String">
            <column name="ACCOUNT_NUMBER" />
        </property>
        <!-- 注意使用完整类名 -->
        <one-to-one name="user" class="com.hibernate.entity.User" property-ref="account"></one-to-one>
    </class>
</hibernate-mapping>

User.hbm.xml

<?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="com.hibernate.entity.User" table="user" catalog="hibernate">
        <id name="userId" type="java.lang.Long">
            <column name="USER_ID" precision="10" scale="0" />
            <generator class="assigned" />
        </id>
        <property name="name" type="java.lang.String">
            <column name="NAME" not-null="true" />
        </property>
        <!-- 共享主键方式映射 one to one 注意 class 要用完整类名-->
        <one-to-one name="relAddress" class="com.hibernate.entity.Address" cascade="save-update"></one-to-one>
        <!-- 单独列外键通过many to one + unique 属性方式映射 one to one 注意 class 要用完整类名-->
        <many-to-one name="account" class="com.hibernate.entity.Account" column="USER_ACCOUNT_ID" unique="true" cascade="save-update"></many-to-one>
         
    </class>
</hibernate-mapping>

Address.hbm.xml

<?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="com.hibernate.entity.Address" table="address" catalog="hibernate">
        <id name="addressId" type="java.lang.Long">
            <column name="ADDRESS_ID" />
            <generator class="foreign">
            <param name="property">user</param>
            </generator>
        </id>
        <property name="street" type="java.lang.String">
            <column name="STREET" not-null="true" />
        </property>
        <!-- 映射 one to one 注意 class 要用完整类名-->
        <one-to-one name="user" class="com.hibernate.entity.User" constrained="true" ></one-to-one>
    </class>
</hibernate-mapping>

工程文件已经打包，包含数据库生成.SQL