当通过id加载实体时，Hibernate enableFilter不起作用

本文介绍了当通过id加载实体时，Hibernate enableFilter不起作用的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我有3个类：

• 事件


• PublicEvent extends Event


• PersonalEvent extends Event

我的hibernate映射文件有点像下面这样。我想为 PersonalEvent 添加一个过滤器，并且在加载这个对象之前，我已经启用了这个过滤器。但这不起作用。我的hibernate版本是 4.3.11.Final 。

Event.hbm.xml

 < hibernate-mapping> 
< class name =org.calendar.Event> 
 ... 
< filter name =personalEventAuthorizecondition =person_ID =：personId/> 
< / class> 
< joined-subclass name =org.calendar.PersonalEventextends =org.calendar.Event> 
< key column =idproperty-ref =id/> 
 ... 
 < / joined-subclass> 
< joined-subclass name =org.calendar.PublicEventextends =org.calendar.Event> 
< key column =idproperty-ref =id/> 
 ... 
< / joined-subclass> 
< filter-def name =personEventAuthorize> 
< filter-param name =personIdtype =integer/> 
< / filter-def> 
< / hibernate-mapping> 
  

PersonalEventRepository

  @Override 
 public PersonalEvent load（Long id）{
 Filter filter = getSession（）。enableFilter（personEventAuthorize）; 
 filter.setParameter（personId，getAuthenticatedPersonId（））; 
返回super.loadById（id）; 
} 
  

生成的SQL查询没有我的过滤器。我的问题是什么？为什么hibernate无法为联合子类启用筛选器？
感谢所有...

解决方案

。我更新了Hibernate用户指南，使其更加明显。

当您加载时， @Filter 不适用直接实体：

  Account account1 = entityManager.find（Account.class，1L）; 
帐户account2 = entityManager.find（Account.class，2L）; 
 
 assertNotNull（account1）; 
 assertNotNull（account2）; 
  

虽然它适用于使用实体查询（JPQL，HQL，Criteria API）的情况：

 账户account1 = entityManager.createQuery（
从账户a中选择一个a.id =：id，
 Account.class）
 .setParameter（id，1L）
 .getSingleResult（）; 
 assertNotNull（account1）; 
尝试{
帐户account2 = entityManager.createQuery（
从帐户a中选择一个帐户a.id =：id，
 Account.class）
 .setParameter （id，2L）
 .getSingleResult（）; 
} 
 catch（NoResultException expected）{
 expected.fillInStackTrace（）; 
 
 
 
 
 
 $ b因此，作为解决方法，使用实体查询（JPQL，HQL，Criteria API）加载实体。
 
I have 3 classes:


Event
PublicEvent extends Event
PersonalEvent extends Event


my hibernate mapping file is somethings like bellow. i wanna add one filter for PersonalEvent and before loading this object, i was enabled that's filter. but this is not working. my hibernate version is 4.3.11.Final.

Event.hbm.xml
<hibernate-mapping>
    <class name="org.calendar.Event">
        ...
        <filter name="personalEventAuthorize" condition="person_ID = :personId" />
    </class>
    <joined-subclass name="org.calendar.PersonalEvent" extends="org.calendar.Event">
        <key column="id" property-ref="id" />
        ...
        <many-to-one name="person" column="person_ID" entity-name="org.person.Person" />
     </joined-subclass>
     <joined-subclass name="org.calendar.PublicEvent" extends="org.calendar.Event">
        <key column="id" property-ref="id" />
        ...
     </joined-subclass>
     <filter-def name="personEventAuthorize">
        <filter-param name="personId" type="integer" />
     </filter-def>
</hibernate-mapping>
PersonalEventRepository
@Override
public PersonalEvent load(Long id) {
    Filter filter = getSession().enableFilter("personEventAuthorize");
    filter.setParameter("personId", getAuthenticatedPersonId());
    return super.loadById(id);
}
hibernate generated SQL Query without my filter. what is my problem? why hibernate can not enabled filter for joined-subclass?thanks for all...
 解决方案 
This is not a bug, it's the intended behavior. I updated the Hibernate User Guide to make it more obvious.
The @Filter does not apply when you load the entity directly:
Account account1 = entityManager.find( Account.class, 1L );
Account account2 = entityManager.find( Account.class, 2L );

assertNotNull( account1 );
assertNotNull( account2 );
While it applies if you use an entity query (JPQL, HQL, Criteria API):
Account account1 = entityManager.createQuery(
    "select a from Account a where a.id = :id",
    Account.class)
    .setParameter( "id", 1L )
.getSingleResult();
assertNotNull( account1 );
try {
    Account account2 = entityManager.createQuery(
        "select a from Account a where a.id = :id",
        Account.class)
    .setParameter( "id", 2L )
    .getSingleResult();
}
catch (NoResultException expected) {
    expected.fillInStackTrace();
}
So, as a workaround, use the entity query (JPQL, HQL, Criteria API) to load the entity.
                        
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