Question

我正在使用datanucleus JDO API来持久化对象。我的orm文件看起来像这样：

   <class name="MyClass" table="mytable">
        <inheritance strategy="complete-table"/>
        <field name="id" column="id" primary-key="true" value- strategy="AUTO_INCREMENT"/>
   </class>

我有

的继承层次结构

@PersistenceCapable
public class MyClass extends NonAbstractMyClassParent {
}

public class NonAbstractMyClassParent extends AbstractMyClassParent    
{
}

public class AbstractMyClassParent    
{
  private Long id;
}

id在MyClassAbstractParent中定义。 MyClassParent在数据库中没有相应的表。

当我尝试坚持MyClass时，我得到以下错误。我试着让MyClassParent也抽象但我仍然得到同样的错误。有什么见解吗？ TIA

javax.jdo.JDOException: Metadata for member "com.xxx.MyClass.id" is attempting to illegally override the primary-key setting of its "root" metadata definition (annotations or ".jdo" XML file). You must specify primary-key information in the "root" metadata definition at org.datanucleus.api.jdo.JDOPersistenceManagerFactory.initialiseMetaData(JDOPersistenceManagerFactory.java:772) at org.datanucleus.api.jdo.JDOPersistenceManagerFactory.(JDOPersistenceManagerFactory.java:564) at org.datanucleus.api.jdo.JDOPersistenceManagerFactory.createPersistenceManagerFactory(JDOPersistenceManagerFactory.java:308) at org.datanucleus.api.jdo.JDOPersistenceManagerFactory.getPersistenceManagerFactory(JDOPersistenceManagerFactory.java:217) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at javax.jdo.JDOHelper$16.run(JDOHelper.java:1975)

Answer 1

移动

<field name="id" column="id" primary-key="true" value- strategy="AUTO_INCREMENT"/>

定义该字段的类，即AbstractMyClassParent（同时也将其标记为持久性）。

datanucleus - 试图非法覆盖主键

1 个答案: