Question

我有一个现有的Oracle DB，其中有2个表对应于下面的类。在DB中，已存在FK b / w AllCodes和AllCodesHistory，以便AllCodesHistory中的ALLCODES列包含来自AllCodes的主键。

但是，当我执行下面的代码时，

[code]
PersistenceManager pm = JdoPersistenceManager.getPersistenceManagerFacotry().getPersistenceManager();
        Object[] o = null;
        Transaction tx = pm.currentTransaction();
        try
        {
            tx.begin();

            System.out.println("Quering....");
            int objectId = 1234;
            q = pm.newQuery("SELECT  FROM AllCodesHistoryJdoImpl where allcodes == " + objectId);
            obj = (List)q.execute();
            System.out.println(obj);
            //System.out.println("Detaching....done");
            tx.commit();
        }
        finally
        {
            if (tx.isActive())
            {
                tx.rollback();
            }
            pm.close();
        }
[/code]

我得到以下异常：

[code]
Exception in thread "main" javax.jdo.JDOUserException: Variable allcodes is unbound and cannot be determined
    at org.datanucleus.api.jdo.NucleusJDOHelper.getJDOExceptionForNucleusException(NucleusJDOHelper.java:549)
    at org.datanucleus.api.jdo.JDOQuery.execute(JDOQuery.java:230)
    at test.Test.main(Test.java:38)
[/code]

为什么我收到此错误的任何想法？最后给出了类定义和映射。

在使用Data nucleus中的schemaTool（并将输出重定向到文件）时，我看到DN不承认FK已经创建并映射到ALLCODES的PK，而是尝试创建自己的专栏和FK。

ALTER TABLE ALLCODESHISTORY ADD ALLCODES_OBJECTID_OID NUMBER (38) NULL;
ALTER TABLE ALLCODESHISTORY ADD CONSTRAINT ALLCODESHISTORY_FK1 FOREIGN KEY (ALLCODES_OBJECTID_OID) REFERENCES ALLCODES (OBJECTID) INITIALLY DEFERRED ;

这可以避免吗？在此先感谢。

[code]
public class AllCodesJdoImpl {
  public int objectId;
  public String code;

   public AllCodesJdoImpl() {

  }

    public void setMasterCode(String value) throws appException {
        this.masterCode = value;
    }


    public String getCode() throws appException {   
        return this.masterCode;
    }



    public int getObjectId() throws appException {
        // TODO Auto-generated method stub
        return objectId;
    }
}


public class AllCodesHistoryJdoImpl implements AllCodesHistory {


      //
      public String oldValue;
      public int objectId;
      public AllCodesJdoImpl allCodes;

    public AllCodesHistoryJdoImpl() {

    }


    public String getOldValue() throws appException {

        return null;
    }


    public void setOldValue(String value) throws appException {
                      return oldValue;

    }



    public AllCodes getAllCodes() throws appException {

        return allCodes;
    }


    public void setAllCodes(AllCodes value) throws appException {

        allCodes = (AllCodesJdoImpl)value;

    }


 public int getObjectId() throws appException {
                // TODO Auto-generated method stub
                return objectId;
        }


}

The corresponding mapping is as below:
        <class name="AllCodesJdoImpl" table="ALLCODES">
            <field name="code" >
            <column name="CODE" length="35" jdbc-type="VARCHAR" />
            </field>
            <field name="objectId" primary-key="true">
            <column name="OBJECTID" length="38" jdbc-type="INTEGER" />
            </field>
        </class>

        <class name="AllCodesHistoryJdoImpl" table="ALLCODESHISTORY">
            <field name="oldValue" >
            <column name="OLDVALUE" length="255" jdbc-type="VARCHAR" />
            </field>
            <field name="allCodes" >
                <element column="ALLCODES"/>            
            </field>
            <field name="objectId" primary-key="true">
            <column name="OBJECTID" length="38" jdbc-type="INTEGER" />
            </field>
        </class> 

[/code]

Answer 1

你拼错了字段名称。 Java区分大小写

用于1-1关系和JDO映射的现有Oracle数据库

1 个答案: