Hibernate - 查询缓存/二级缓存不适用于包含子项的值对象

发布于 2024-08-20 10:46:07 字数 1348 浏览 12 评论 0原文

我一直在努力解决以下问题：
我有一个包含不同面板的值对象。每个面板都有一个字段列表。

映射：

<class name="com.aviseurope.core.application.RACountryPanels" table="CTRY" schema="DBDEV1A" where="PEARL_CTRY='Y'" lazy="join">
<cache usage="read-only"/>
<id name="ctryCode">
<column name="CTRY_CD_ID" sql-type="VARCHAR2(2)" not-null="true"/>
</id>
<bag name="panelPE" table="RA_COUNTRY_MAPPING" fetch="join" where="MANDATORY_FLAG!='N'">
<key column="COUNTRY_LOCATION_ID"/>
<many-to-many class="com.aviseurope.core.application.RAFieldVO" column="RA_FIELD_MID" where="PANEL_ID='PE'"/>
</bag>
</class>

我使用以下条件来获取值对象：

Session m_Session = HibernateUtil.currentSession();
            m_Criteria = m_Session.createCriteria(RACountryPanels.class);
            m_Criteria.add(Expression.eq("ctryCode", p_Country));
            m_Criteria.setCacheable(true);

正如我所看到的，查询缓存仅包含主要选择，例如

select * from CTRY where ctry_cd_id=?

RACountryPanels 和 RAFieldVO 都是二级缓存。如果我检查二级缓存内容，我可以看到它也包含 RAFields 和 RACountryPanels，并且我还可以在查询缓存区域中看到 select .. from CTRY where ctry_cd_id=... 。

当我调用 servlet 时，它似乎正在使用缓存，但第二次则没有。 如果我使用 JMX 检查缓存的内容，一切似乎都正常，但是当我测量对象访问时间时，它似乎并不总是使用缓存。

干杯佐尔坦

原文

I have been struggling with the following problem:
I have a value object containing different panels. Each panel has a list of fields.

Mapping:

<class name="com.aviseurope.core.application.RACountryPanels" table="CTRY" schema="DBDEV1A" where="PEARL_CTRY='Y'" lazy="join">
<cache usage="read-only"/>
<id name="ctryCode">
<column name="CTRY_CD_ID" sql-type="VARCHAR2(2)" not-null="true"/>
</id>
<bag name="panelPE" table="RA_COUNTRY_MAPPING" fetch="join" where="MANDATORY_FLAG!='N'">
<key column="COUNTRY_LOCATION_ID"/>
<many-to-many class="com.aviseurope.core.application.RAFieldVO" column="RA_FIELD_MID" where="PANEL_ID='PE'"/>
</bag>
</class>

I use the following criteria to get the value object:

Session m_Session = HibernateUtil.currentSession();
            m_Criteria = m_Session.createCriteria(RACountryPanels.class);
            m_Criteria.add(Expression.eq("ctryCode", p_Country));
            m_Criteria.setCacheable(true);

As I see the query cache contains only the main select like

select * from CTRY where ctry_cd_id=?

Both RACountryPanels and RAFieldVO are second level cached.
If I check the 2nd level cache content I can see that it cointains the RAFields and the RACountryPanels as well and I can see the select .. from CTRY where ctry_cd_id=... in query cache region as well.

When I call the servlet it seems that it is using the cache, but second time not.
If I check the content of the cache using JMX, everything seems to be ok, but when I measure the object access time, it seems that it does not always use the cache.

Cheers
Zoltan

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暮年慕年 2024-08-27 10:46:07

我认为您还需要缓存关联：

<bag name="panelPE" table="RA_COUNTRY_MAPPING" fetch="join" where="MANDATORY_FLAG!='N'">

  <cache usage="read-write"/>

  <key column="COUNTRY_LOCATION_ID"/>
  <many-to-many class="com.aviseurope.core.application.RAFieldVO" column="RA_FIELD_MID" where="PANEL_ID='PE'"/>
</bag>

I think that you need to also cache the association:

<bag name="panelPE" table="RA_COUNTRY_MAPPING" fetch="join" where="MANDATORY_FLAG!='N'">

  <cache usage="read-write"/>

  <key column="COUNTRY_LOCATION_ID"/>
  <many-to-many class="com.aviseurope.core.application.RAFieldVO" column="RA_FIELD_MID" where="PANEL_ID='PE'"/>
</bag>

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