Question

当我尝试更新对象RFQ时，Hibernate倾向于更新其子集合BQMaster并尝试设置和更新BQMaster的标识符，通常不应该允许它。

postgre日志文件：
2009-05-22 11:16:53错误：重复键违反了唯一约束“bq_masters_pkey”
2009-05-22 11:16:53声明：更新bq_masters设置rfq_id = $ 1， id = $ 2 其中 id = $ 3

控制台中

错误：
引起：java.sql.BatchUpdateException：批处理条目0 更新bq_masters设置rf q_id = 2，id = 0，其中id = 49449 被中止。调用getNextException以查看原因
at org.postgresql.jdbc2.AbstractJdbc2Statement $ BatchResultHandler.handle 误差（AbstractJdbc2Statement.java:2392）
at org.postgresql.core.v3.QueryExecutorImpl.processResults（QueryExecutor Impl.java:1257）
at org.postgresql.core.v3.QueryExecutorImpl.execute（QueryExecutorImpl.ja VA：334）
at org.postgresql.jdbc2.AbstractJdbc2Statement.executeBatch（AbstractJdbc） 2Statement.java:2451）
at org.hibernate.jdbc.BatchingBatcher.doExecuteBatch（BatchingBatcher.jav）一：58）
at org.hibernate.jdbc.AbstractBatcher.executeBatch（AbstractBatcher.java： 195）
... 32更多

尝试更新bq_masters的id似乎很奇怪。它应该保留id并仅更新其他字段。

Criteria crit = session.createCriteria(BQMaster.class);
crit.add(Restrictions.eq("project",project);
crit.setFirstResult(5);
crit.setMaxResult(2);
List bqMasters = crit.list();  

RFQ rfq = (RFQ)session.get(RFQ.class, RFQId);
rfq.setBqMasters(bqMasters);
session.update(rfq);

Hibernate映射：

<class name="RFQ" table="rfq">
  <id name="id" column="id">
     <generator class="native">
        <param name="sequence">rfq_id_seq</param>
     </generator>
  </id>

  <property name="reference" column="reference" />
  <property name="status" column="status" />
  <property name="created" column="created" />
  <property name="modified" column="modified" />

  <many-to-one name="project" class="Project" column="project_id" cascade="save-update" />

  <list name="subcons" table="rfq_subcons">
     <key column="rfq_id" />
     <list-index column="id"/>
     <many-to-many class="Subcon" column="subcon_id"/> 
  </list>

  <list name="bqMasters">
     <key column="rfq_id" />
     <list-index column="id"/>
     <one-to-many class="BQMaster"/>
  </list>
</class>  

<class name="BQMaster" table="bq_masters">
  <id name="id" column="id">
     <generator class="native">
        <param name="sequence">bq_masters_id_seq</param>
     </generator>
  </id>

  <property name="reference" column="reference" />
  <property name="description" column="description" />
  <property name="lod" column="lod" />
  <property name="uom" column="uom" />
  <property name="quantity" column="quantity" />
  <property name="parentId" column="parent_id" />
  <property name="groupId" column="group_id" />
  <property name="leaf" column="leaf" />
  <property name="active" column="active" />
  <property name="subcontract" column="subcontract" />
  <property name="created" column="created" />
  <property name="modified" column="modified" />

  <many-to-one name="project" class="Project" column="project_id" cascade="save-update" />

  <many-to-one name="page" class="Page" column="page_id" cascade="save-update" />

  <many-to-one name="rfq" class="RFQ" column="rfq_id" cascade="save-update" />

</class>

数据库结构供参考：

CREATE TABLE rfq
(   
    id bigserial NOT NULL, 
    project_id bigint, 
    reference text, 
    status text, 
    created timestamp without time zone, 
    modified timestamp without time zone, 
    CONSTRAINT rfq_pkey PRIMARY KEY (id), 
    CONSTRAINT rfq_project_id_fkey FOREIGN KEY (project_id) 
    REFERENCES projects (id) MATCH SIMPLE ON UPDATE CASCADE ON DELETE CASCADE
);  

CREATE TABLE bq_masters
(
    id bigserial NOT NULL, 
    reference varchar(100), 
    project_id bigint, 
    page_id bigint, 
    rfq_id bigint,
    description text, 
    lod integer, 
    uom varchar(20), 
    quantity numeric, 
    parent_id bigint, 
    group_id bigint,
    leaf boolean, 
    active boolean, 
    subcontract boolean, 
    created timestamp without time zone, 
    modified timestamp without time zone, 
    CONSTRAINT bq_masters_pkey PRIMARY KEY (id), 
    CONSTRAINT bq_masters_project_id_fkey FOREIGN KEY (project_id) 
    REFERENCES projects (id) MATCH SIMPLE ON UPDATE CASCADE ON DELETE CASCADE, 
    CONSTRAINT bq_masters_page_id_fkey FOREIGN KEY (page_id)
    REFERENCES pages (id) MATCH SIMPLE ON UPDATE CASCADE ON DELETE CASCADE,
    CONSTRAINT bq_masters_rfq_id_fkey FOREIGN KEY (rfq_id)
    REFERENCES rfq (id) MATCH SIMPLE ON UPDATE CASCADE ON DELETE CASCADE
);

我尝试在RFQ一对多映射中添加inverse =“true”但无济于事，因为它不会更新相应RFQ对象的BQMaster。

有没有人有解决这个问题的线索？提前谢谢。

Answer 1

Hibernate正是你在内存中所做的事情。您将bqmasters放入bqMasters表中，并将此关系映射到bqmasters中的rfq_id列，以便更新外键。

你必须使用反向。相同的列rfq_id用于两个属性，Hibernate只能使用一个。

你的内存实际上存在一致性问题。如果将bqmaster添加到列表中，则还需要更新它的rfq属性，因为它保持相同的父子关系并且还映射到同一个数据库列。

顺便说一下，您不必对会话中已有的对象调用update。 Hibernate将通知对象已更改并将更新它。

Hibernate - 子集合标识符在更新中已更改

1 个答案: