休眠：表未更新

Question

I'm having trouble with my hibernate transaction. After execution , table has no values in it and is not updated at all. All my other updates work properly.

Here's the mapping

 <class name="LastDownloadedMessage" table="t_imap_lastmsguid">
    <id name="id" column="id" ><generator class="increment"/></id>
    <property name="lastDownloadedMessageUid"><column name="last_msg_uid" /></property>
    <property name="lastUidNext"><column name="next_msg_uid" /></property>
    <property name="folder"><column name="folder_name" /></property>
     <property name="cred"><column name="credential" /></property>
 </class>

This is the POJO object :

public class LastDownloadedMessage {
    Integer id;
    private String lastDownloadedMessageUid;
    private String lastUidNext;
    private String folder;
    private String cred;

    //GETTERS AND SETTERS HERE

    public LastDownloadedMessage() {
        super();
    }
    public LastDownloadedMessage(String lastDownloadedMessageUid,
            String lastUidNext) {
        super();
        this.lastDownloadedMessageUid = lastDownloadedMessageUid;
        this.lastUidNext = lastUidNext;
    }
}

and this is the function which is doing the update.

    Session ssn=HibernateSessionFactory.openSession();
    Transaction txn = ssn.beginTransaction();
    Query query = ssn.createQuery("update LastDownloadedMessage e set e.lastDownloadedMessageUid = :luid , e.lastUidNext = :nextUid where e.folder =:folder and e.cred = :cred");
    query.setParameter("luid",last_downloaded_msg_uid);
    query.setParameter("nextUid", uid_next);
    query.setParameter("folder", folder);
    query.setParameter("cred", credential);
    int result = query.executeUpate();
    txn.commit();
    ssn.flush();
    ssn.close();

The function appears to execute properly with no errors . What could be the issue ?

Answer 1

Based on the comments, it seems to me you are confusing UPDATE with INSERT. If result is zero, it means your WHERE clause didn't match anything, so there's nothing to update.

Also, why are you trying to issue an UPDATE/INSERT on a known (mapped) entity? All you have to do is set your values on your object (LastDownloadedMessage) and then execute a persist on your EntityManager. Browse around the web for EntityManager.persist .