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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,这通常是不允许的。

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

控制台错误:
原因:java.sql.BatchUpdateException:批处理条目 0更新 bq_masters set rf q_id=2, id=0 where id=49449 was aborted。调用 getNextException 查看原因。在org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutor Impl.java:1257)在 org.postgresql.core.v3.QueryExecutorImpl
的 org.postgresql.jdbc2.AbstractJdbc2Statement$BatchResultHandler.handle Error(AbstractJdbc2Statement.java:2392) org.hibernate.jdbc.BatchingBatcher.doExecuteBatch( BatchingBatcher.java:58)org.hibernate.execute( QueryExecutorImpl.ja va:334) .jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:195)





... 32 更多

当它试图更新 bq_masters 的 id 时,这似乎很奇怪。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);  

休眠映射:

<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 BQMasters。

有人对解决这个问题有任何线索吗?提前致谢。

4

1 回答 1

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Hibernate 完全按照您在内存中所做的工作。您将 bqmasters 放入 bqMasters 表中,并且将此关系映射到rfq_idbqmasters 中的列,因此它会更新外键。

为此,您必须使用逆。同一列rfq_id用于两个属性,Hibernate 只能使用一个。

您实际上在内存中存在一致性问题。如果将 bqmaster 添加到列表中,还需要更新它的 rfq 属性,因为它持有相同的父子关系,并且还映射到相同的数据库列。

顺便说一句,您不必对会话中已经存在的对象调用更新。Hibernate 将通知对象已更改并将更新它。

于 2009-05-26T10:10:47.120 回答