java - 在 AppEngine 上删除实体时出错

Question

我在尝试从数据库中删除实体时遇到了一些问题。我有一个接口(interface)可以从我的业务对象中抽象出 AppEngine 实体。我可以轻松地插入和更新，但是当我尝试删除时出现错误:

java.lang.UnsupportedOperationException: Non-owned relationships are not currently supported at org.datanucleus.store.appengine.DatastoreFKListStoreSpecialization.clearWit houtDelete(DatastoreFKListStoreSpecialization.java: 123) at org.datanucleus.sco.backed.List.clear(List.java:817) at org.datanucleus.store.mapped.mapping.CollectionMapping.preDelete(Collection Mapping.java: 299) at org.datanucleus.store.appengine.DependentDeleteRequest.execute(DependentDel eteRequest.java: 71) ...

我得到了界面...

public interface ICompany extends IEntityBean { 
  // Getters 
  public List<IUser> getUsers(); 
  public List<IDepartment> getDepartments(); 
  public ICurrency getCurrency() throws Exception; 
} 

...实现...

public class GAECompany extends GAEEntityBean implements ICompany { 
  @Override 
  @OneToMany(mappedBy = "company") 
  public List<IUser> getUsers() { 
    return this.users; 
  } 

  @Override 
  @OneToMany(mappedBy = "company") 
  public List<IDepartment> getDepartments() { 
     return this.departments; 
  } 

  @Transient 
  public ICurrency getCurrency() throws Exception { 
  return this.currency; 
  } 
} 

以及要删除的代码...

  // Get the entity manager 
  EntityManager em = this.getDBManager(); 

  IEntityBean persistent = em.find(obj.getClass(), obj.getId()); 
  em.remove(persistent); 
  em.flush(); 

我没有任何依赖对象 我刚刚创建了一个公司，现在我正试图删除它。我假设映射是正确的，因为我能够插入更新公司。但不删除!难道我做错了什么？？

Answer 1

解决了!

我刚刚将 Google JDO/JPA 的版本更新到 2.0，它运行良好!