java - hibernate 不加载关联对象

Question

我正在尝试加载一个 hibernate 对象 ForumMessage，但其中包含另一个对象 Users，而该 Users 对象未被加载。

我的论坛消息映射文件:

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- Generated Jan 4, 2011 10:10:29 AM by Hibernate Tools 3.4.0.Beta1 -->
<hibernate-mapping>
    <class name="com.BiddingSystem.Models.ForumMessage" table="FORUMMESSAGE">
        <id name="ForumMessageId" type="long">
            <column name="FORUMMESSAGEID" />
            <generator class="native" />
        </id>
        <property name="ForumMessage" type="java.lang.String">
            <column name="FORUMMESSAGE" />
        </property>
        <many-to-one name="User" class="com.BiddingSystem.Models.Users" fetch="join">
            <column name="UserId" />
        </many-to-one>
        <property name="DatePosted" type="java.util.Date">
            <column name="DATEPOSTED" />
        </property>
        <many-to-one name="Topic" class="com.BiddingSystem.Models.ForumTopic" fetch="join">
            <column name="TopicId" /> 
        </many-to-one>
    </class>
</hibernate-mapping>

我正在使用以下代码:

Session session = gileadHibernateUtil.getSessionFactory().openSession();

            SQL="from ForumMessage";


    System.out.println(SQL);
    Query query=session.createQuery(SQL);
    System.out.println(query.list().size());
    return new LinkedList <ForumMessage>(query.list());

Answer 1

<many-to-one name="User" class="com.BiddingSystem.Models.Users" fetch="join" lazy="false">

您还需要添加 lazy="false"。