查询Oracle视图时,Hibernate使用空值返回列表

Question

当使用Hibernate 4查询Oracle视图时,我得到一个大小大于0的列表,表示在SQL Developer中运行相同查询时获得的元素数.当我遍历列表时,我只获得空值.

我的hibernate.cfg.xml看起来像:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
    "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
    "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
    <property name="hibernate.connection.driver_class">oracle.jdbc.driver.OracleDriver</property>

    <property name="hibernate.connection.url">jdbc:oracle:thin:@127.0.0.1:1521:OUT</property>
    <property name="hibernate.connection.username">username</property>
    <property name="hibernate.connection.password">password</property>
    <property name="hibernate.default_schema">schema</property>

    <property name="hibernate.dialect">org.hibernate.dialect.Oracle10gDialect</property>

    <property name="hibernate.connection.pool_size">1</property>

    <property name="hibernate.current_session_context_class">thread</property>

    <property name="hibernate.cache.provider_class">org.hibernate.cache.NoCacheProvider</property>
    <property name="hibernate.hbm2ddl.auto">update</property>

    <mapping resource="be/comp/model/db/VwPersoneelslid.hbm.xml"/>
</session-factory>

VwPersoneelslid.hbm.xml看起来像:

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<!-- Generated 9-aug-2013 10:13:31 by Hibernate Tools 4.0.0 -->
<hibernate-mapping>
<class name="be.comp.model.db.VwPersoneelslid" table="VW_PERSONEELSLID">
    <composite-id name="id" class="be.comp.model.db.VwPersoneelslidId">
        <key-property name="pkVwPersoneelslid" type="double">
            <column name="PK_VW_PERSONEELSLID" precision="126" scale="0" />
        </key-property>
        <key-property name="fkVwFunctie" type="double">
            <column name="FK_VW_FUNCTIE" precision="126" scale="0" />
        </key-property>
        <key-property name="familienaam" type="string">
            <column name="FAMILIENAAM" length="80" />
        </key-property>
        <key-property name="voornaam" type="string">
            <column name="VOORNAAM" length="80" />
        </key-property>
        <key-property name="code" type="string">
            <column name="CODE" length="10" />
        </key-property>

    </composite-id>
</class>

查询的功能是:

public List<VwPersoneelslid> findByCode(String code)
{
    Session session = HibernateUtil.getSessionFactoryNeptunus().getCurrentSession();
    session.beginTransaction();

    List<VwPersoneelslid> list = new ArrayList();

    Query query = session.createQuery("FROM VwPersoneelslid WHERE code = :code"); 
    query.setParameter("code", code);
    list = query.list();

    session.getTransaction().commit();

    return list;
}

该函数转换为本机SQL:

public List<VwPersoneelslid> findByCode(String code)
{
    Session session = HibernateUtil.getSessionFactoryNeptunus().getCurrentSession();
    session.beginTransaction();

    List<VwPersoneelslid> list = new ArrayList();

    Query query = session.createSQLQuery("SELECT * FROM CIPALII.VW_PERSONEELSLID WHERE code = :code").addEntity(VwPersoneelslid.class)
            .setParameter("code", code);

    list = query.list();

    session.getTransaction().commit();

    return list;
}

如果您需要更多信息以了解可能存在的问题,请告诉我并添加更多代码.VwPersoneelslid.hbm.xml文件由Eclipse自动生成.谢谢.

Answer 1

我设法创建了一个解决方法。至少对我来说，问题在于 Hibernate 工具创建了 composite-id 。如果不跳过几个环节，我就无法正常工作。所以我设法摆脱了 compoto-id 。在我的 reveng.xml 文件中我添加了：

<table name="VW_PERSONEELSLID">
    <primary-key>
        <key-column name="PK_VW_PERSONEELSLID" />
    </primary-key>
</table>

这会生成一个 id (PK_VW_PERSONEELSLID)，它允许我继续使用 Hibernate 工具。我不知道这是否是一个肮脏的修复。可能会在几天内发现这一点。