hibernate - Spring OpenSessionInViewFilter : can't save object

Question

我遇到了 spring + hibernate 的常见错误，但无法修复它。我有 2 个具有一对多关系的表:每个 Bsc 有许多 Cell

我的 hibernate 配置:

<class name="Bsc" table="bsc">
    <id name="id" column="id">
        <generator class="native" />
    </id>
    <property name="name" />
    <set name="cells">
        <key column="bsc_id" />
        <one-to-many class="Cell" />
    </set>
</class>

    <class name="Cell" table="cell">
    <id name="id" column="id">
        <generator class="native" />
    </id>
    <property name="name" column="name" />
    <many-to-one name="bsc" column="bsc_id" not-null="true" />
</class>

我的道:

public class BscDaoImpl extends HibernateDaoSupport implements BscDao {

@Override
public Bsc get(int id) {
    return (Bsc) getHibernateTemplate().get(Bsc.class, id);
}

@Override
public void save(Bsc bsc) {
    getHibernateTemplate().saveOrUpdate(bsc);
}
}

我的 Controller :

public class BscFormController extends SimpleFormController {

private BscDao bscDao;

public void setBscDao(BscDao bscDao) {
    this.bscDao = bscDao;
}

protected Object formBackingObject(HttpServletRequest request)
        throws Exception {
    String id = request.getParameter("id");

    if (!StringUtils.isBlank(id)) {
        return bscDao.get(new Integer(id));
    }

    return new Bsc();
}

public ModelAndView onSubmit(HttpServletRequest request,
        HttpServletResponse response, Object command, BindException errors)
        throws Exception {

    Bsc bsc = (Bsc) command;
    String success = getSuccessView();

    bscDao.save(bsc);

    return new ModelAndView(success);
}
}

在我看来，我有一个用于创建/编辑 bsc 信息的表单。另外，我想列出这个bsc的所有单元格，所以我在web.xml中配置延迟加载

<filter>
    <filter-name>openSessionInViewFilter</filter-name>
    <filter-class>org.springframework.orm.hibernate3.support.OpenSessionInViewFilter</filter-class>
    <init-param>
        <param-name>singleSession</param-name>
        <param-value>true</param-value>
    </init-param>
    <init-param>
        <param-name>flushMode</param-name>
        <param-value>AUTO</param-value>
    </init-param>
    <init-param>
        <param-name>sessionFactoryBeanName</param-name>
        <param-value>mySessionFactory</param-value>
    </init-param>
</filter>

我的问题:按下“保存”按钮时无法保存对象(如果删除 OpenSessionInViewFilter 配置，它就可以保存)。

---

我添加了 TransactionManager 配置:

<bean id="transactionManager"     class="org.springframework.orm.hibernate3.HibernateTransactionManager">
    <property name="sessionFactory" ref="mySessionFactory"/>
</bean>

但是还是不行。我错过了什么吗？

Answer 1

我已经通过在 web.xml 中设置 OpenSessionInViewFilter 解决了这个问题

<filter>
        <filter-name>lazyLoadingFilter</filter-name>
        <filter-class>org.springframework.orm.hibernate3.support.OpenSessionInViewFilter</filter-class>
            <init-param>
            <param-name>flushMode</param-name>
            <param-value>AUTO</param-value>
        </init-param>
</filter>

问候