hibernate 级联更新时为什么只能更新一个表

最新推荐文章于 2023-09-06 22:43:12 发布

原创最新推荐文章于 2023-09-06 22:43:12 发布 · 723 阅读

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本文详细解析了在使用Hibernate进行级联更新时，为何只能更新一个表而另一个表直接插入数据的原因，涉及一对多和多对一关联配置。

hibernate 级联更新时为什么只能更新一个表，而另外一个表是直接插入了数据。。并没有更新。谁知道是为什么

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping>
    <class name="com.accp.entity.VoteOption" table="VOTE_OPTION">
        <id name="id" type="java.lang.Short">
            <column name="VO_ID"/>
           <generator class="sequence">
            <param name="sequence">vote_seq</param>
            </generator>
        </id>
        <property name="option" type="java.lang.String">
            <column name="VO_OPTION" length="10" not-null="true"/>
        </property>
       <many-to-one name="subject" class="com.accp.entity.VoteSubject" lazy="false" cascade="all">
         <column name="VS_ID"></column>
       </many-to-one>
    </class>
</hibernate-mapping>

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping>
    <class name="com.accp.entity.VoteSubject" table="VOTE_SUBJECT">
        <id name="id" type="java.lang.Integer">
            <column name="ID"/>
            <generator class="sequence">
            <param name="sequence">vote_seq</param>
            </generator>
        </id>
        <property name="title" type="java.lang.String">
            <column name="VS_TITLE" length="10" not-null="true"/>
        </property>
        <property name="type" type="java.lang.Short">
            <column name="VS_TYPE" length="10" not-null="true"/>
        </property>

        <set name="option" table="VOTE_OPTION" cascade="all" inverse="true" lazy="false">
        <key>
          <column name="VS_ID"></column>
        </key>
        <one-to-many class="com.accp.entity.VoteOption"/>
        </set>
    </class>
</hibernate-mapping>

我这两个表是配置的双向关联。。一对多和多对一关联。也设置了级联。

Hibernate: insert into VOTE_OPTION (VO_OPTION, VS_ID, VO_ID) values (?, ?, ?)
Hibernate: insert into VOTE_OPTION (VO_OPTION, VS_ID, VO_ID) values (?, ?, ?)
Hibernate: insert into VOTE_OPTION (VO_OPTION, VS_ID, VO_ID) values (?, ?, ?)
Hibernate: insert into VOTE_OPTION (VO_OPTION, VS_ID, VO_ID) values (?, ?, ?)
Hibernate: insert into VOTE_OPTION (VO_OPTION, VS_ID, VO_ID) values (?, ?, ?)
Hibernate: insert into VOTE_OPTION (VO_OPTION, VS_ID, VO_ID) values (?, ?, ?)
Hibernate: insert into VOTE_OPTION (VO_OPTION, VS_ID, VO_ID) values (?, ?, ?)
Hibernate: insert into VOTE_OPTION (VO_OPTION, VS_ID, VO_ID) values (?, ?, ?)
Hibernate: insert into VOTE_OPTION (VO_OPTION, VS_ID, VO_ID) values (?, ?, ?)
Hibernate: insert into VOTE_OPTION (VO_OPTION, VS_ID, VO_ID) values (?, ?, ?)
Hibernate: insert into VOTE_OPTION (VO_OPTION, VS_ID, VO_ID) values (?, ?, ?)
Hibernate: insert into VOTE_OPTION (VO_OPTION, VS_ID, VO_ID) values (?, ?, ?)
Hibernate: insert into VOTE_OPTION (VO_OPTION, VS_ID, VO_ID) values (?, ?, ?)
Hibernate: insert into VOTE_OPTION (VO_OPTION, VS_ID, VO_ID) values (?, ?, ?)
Hibernate: insert into VOTE_OPTION (VO_OPTION, VS_ID, VO_ID) values (?, ?, ?)
Hibernate: insert into VOTE_OPTION (VO_OPTION, VS_ID, VO_ID) values (?, ?, ?)
Hibernate: insert into VOTE_OPTION (VO_OPTION, VS_ID, VO_ID) values (?, ?, ?)
Hibernate: update VOTE_SUBJECT set VS_TITLE=?, VS_TYPE=? where ID=?

控制台只输出了一条 update语句

public String updateVoteSubject(){  //更新投票内容
  int id = Integer.parseInt(ServletActionContext.
    getRequest().getParameter("SubjectId"));
  VoteSubject subject = new VoteSubject();
  subject.setId(id);
  subject.setTitle(this.subject.getTitle());
  subject.setType(new Short(this.subject.getType()));
   for(int i = 0; i<options.length; i++){
    VoteOption option = new VoteOption();
    option.setOption(options[i]);
    option.setSubject(subject);
    subject.getOption().add(option);
   }

   new VoteSubjectDaoImpl().voteUpdate(subject);
  return "update";
}