如何存储复杂的对象?在调用makePersistent(person)对象时,在子对象的子对象列表中有一个对象有四个子对象列表。帮帮我!!!!!!!!!!!!Google App Engine JDO问题
我打电话给pm.makePersistent();但列表
@Persistent
private List<ChoosedElementEntity> choosedElements = new ArrayList<ChoosedElementEntity>();
@Persistent
private List<PleasantElementEntity> pleasantElements = new ArrayList<PleasantElementEntity>();
@Persistent
private List<UnpleasantElementEntity> unpleasantElements = new ArrayList<UnpleasantElementEntity>();
@Persistent
private List<SetViewElementEntity> setViewElements = new ArrayList<SetViewElementEntity>();
未保存!!!
例如:
@PersistenceCapable(table = "persons", identityType = IdentityType.APPLICATION)
public class PersonEntity {
@PrimaryKey
@Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
private Long id;
@Persistent
private List<OfferEntity> offers = new ArrayList<OfferEntity>();
}
@PersistenceCapable(table = "offers", identityType = IdentityType.APPLICATION)
public class OfferEntity {
@PrimaryKey
@Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
private Key id;
@Persistent
private List<ChoosedElementEntity> choosedElements = new ArrayList<ChoosedElementEntity>();
@Persistent
private List<PleasantElementEntity> pleasantElements = new ArrayList<PleasantElementEntity>();
@Persistent
private List<UnpleasantElementEntity> unpleasantElements = new ArrayList<UnpleasantElementEntity>();
@Persistent
private List<SetViewElementEntity> setViewElements = new ArrayList<SetViewElementEntity>();
}
@PersistenceCapable(table = "offer_selections", identityType = IdentityType.APPLICATION)
public class ChoosedElementEntity {
@PrimaryKey
@Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
private Key id;
@Persistent
private String code;
@Persistent
private Text cmComments;
}
@PersistenceCapable(table = "offer_selections", identityType = IdentityType.APPLICATION)
public class PleasantElementEntity {
@PrimaryKey
@Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
private Key id;
@Persistent
private String code;
@Persistent
private Text cmComments;
}
@PersistenceCapable(table = "offer_selections", identityType = IdentityType.APPLICATION)
public class UnpleasantElementEntity {
@PrimaryKey
@Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
private Key id;
@Persistent
private String code;
@Persistent
private Text cmComments;
}
请阅读我的回答,您的注释显然不正确,正如Google文档中所述。 – corydoras 2010-07-21 00:45:34
请告诉我如何正确! – Artem 2010-07-21 05:01:32