Hibernate joined-subclass和subclass的配置文件

最新推荐文章于 2017-01-07 18:55:12 发布

原创最新推荐文章于 2017-01-07 18:55:12 发布 · 1.1k 阅读

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文章标签：

#hibernate #myeclipse #generator #encoding #table #class

本文详细介绍了使用Hibernate进行对象关系映射（ORM）的具体配置方法，包括如何定义基本属性及子类属性，适用于多种数据库环境。通过具体示例展示了如何为不同类型的实体设置属性映射。

<?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.rongbin.joinclass.Item" table="Item" schema="dbo" >
        <id name="id" type="java.lang.String">
            <column name="id" length="50" />
            <generator class="assigned" />
        </id>

        <property name="name" type="java.lang.String">
            <column name="name" length="50" not-null="true" ></column>
        </property>
        <property name="manufacturer" type="java.lang.String">
            <column name="manufacturer" length="50" not-null="true" />
        </property>
        <joined-subclass name="com.rongbin.joinclass.Book" table="Book">
        <key column="id"></key>
        <property name="pagecount" type="java.lang.String" column="pagecount"></property>
        </joined-subclass>
        <joined-subclass name="com.rongbin.joinclass.Dvd" table="Dvd">
        <key column="id"></key>
        <property name="regioncode" type="java.lang.String" column="regioncode"></property>
        </joined-subclass>
    </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="com.rongbin.subclass.Item" table="TItem" schema="dbo" >
        <id name="id" type="java.lang.String">
            <column name="id" length="50" />
            <generator class="assigned" />
        </id>
        <discriminator column="category" type="java.lang.String"></discriminator>
        <property name="name" type="java.lang.String">
            <column name="name" length="50" not-null="true" />
        </property>
        <property name="manufacturer" type="java.lang.String">
            <column name="manufacturer" length="50" not-null="true" />
        </property>
        <subclass name="com.rongbin.subclass.Book" discriminator-value="1">
         <property name="pagecount" type="java.lang.String">
            <column name="pagecount" length="50" />
        </property>
        </subclass>
        <subclass name="com.rongbin.subclass.Dvd" discriminator-value="2">
        <property name="regioncode" type="java.lang.String">
            <column name="regioncode" length="50" />
        </property>
        </subclass>
    </class>
</hibernate-mapping>