Event.hbm.xml与战斗有一对多的关系
<class name="Event" table="event">
<id name="oid" type="long" column="oid">
<generator class="increment">
<param name="initial_value">1</param>
</generator>
</id>
<property name="address">
<column name="address"/>
</property>
<property name="date">
<column name="date"/>
</property>
<list name="fights" cascade="all">
<key column="eventOid"></key>
<index column="type"></index>
<one-to-many class="Fight"/>
</list>
</class>
检索现有事件
public Event getEvtByDateAddress(String _date, String _address)
{
try
{
if(!session.isOpen())
{
session = HibernateUtil.getSessionFactory().openSession();
}
session.beginTransaction();
Criteria criteria = session.createCriteria(Event.class);
criteria.add(Restrictions.eq("date", _date));
criteria.add(Restrictions.eq("address", _address));
Event evt = (Event)criteria.uniqueResult();
if (evt==null)
{
return null;
}
else
{
return evt;
}
}
catch(Exception e)
{
return null;
}
}
调用此更新。
public int updateEvent(Event _event)
{
try
{
if(!session.isOpen())
{
session = HibernateUtil.getSessionFactory().openSession();
}
Event tmpEvent=new Event();
if((tmpEvent=this.getEvtByDateAddress(_event.getDate(), _event.getAddress()))!=null)
{
tmpEvent.setFights(_event.getFights());
Transaction tx =session.beginTransaction();
session.update(tmpEvent);
session.flush();
tx.commit();
session.close();
return 0;
}
else
{
return -1;
}
}
catch(Exception e){
return -254;
}
}
更新后,结果意外。插入新记录而不是更新记录。
oid boxer1Oid boxer2Oid eventOid type
1 1 3 \N \N
2 2 4 \N \N
3 5 6 \N \N
4 7 8 \N \N
5 1 2 1 0
6 3 4 1 1
7 5 6 1 2
8 7 8 1 3
预期结果
oid boxer1Oid boxer2Oid eventOid type
1 1 2 1 0
2 3 4 1 1
3 5 6 1 2
4 7 8 1 3
我只是检索现有记录并对其进行修改,结果出乎意料。
if((tmpEvent=this.getEvtByDateAddress(_event.getDate(),_event.getAddress()))!=null)
tmpEvent.setFights(_event.getFights());
-------
session.update(tmpEvent);
我错过了什么才能获得预期的结果?
谢谢
答案 0 :(得分:1)
确保this.getEvtByDateAddress
设置oid
返回的实体的getFights
。
此外,请勿创建新事件。 Event tmpEvent=new Event();
可以是Event tmpEvent = null;