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在我的谷歌应用引擎应用程序中，我在下面坚持了一段时间的 jdo，

package com.acti.JDO;

import javax.jdo.annotations.IdGeneratorStrategy;
import javax.jdo.annotations.PersistenceCapable;
import javax.jdo.annotations.Persistent;
import javax.jdo.annotations.PrimaryKey;

import com.google.appengine.api.datastore.Key;

@PersistenceCapable
public class Subscription {

@PrimaryKey
@Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
private Key key ;

public Key getKey() {
    return key;
}

public void setKey(Key key) {
    this.key = key;
}

@Persistent
private String email;

@Persistent
private String clientID;

public String getEmail() {
    return email;
}

public void setEmail(String email) {
    this.email = email;
}

public String getClientID() {
    return clientID;
}

public void setClientID(String clientID) {
    this.clientID = clientID;
}
}

后来我想将clientID更改为clientId，

@Persistent
private String clientId;

public String getClientId() {
    return clientId;
}

public void setClientID(String clientId) {
    this.clientId = clientId;
}

并相应地进行了更改并删除了以前的 jdo 实体并开始使用新的“clientId”键持久化 jdo。虽然我只能在 Datastore 中看到 clientId，但是当我检索订阅 jdos 时，我得到的键是“ClientID”

我试图获取 jdo 实体的代码如下

   public ArrayList<Subscription> getSubscriptionJDOs(String    queryParam)
   {
    ArrayList<Subscription> subscriptionJDOList = null;
    PersistenceManager          persistentManager  = null;
    Query                                   query  = null;

    try
    {
        subscriptionJDOList   = new ArrayList<Subscription>();  
        persistentManager     = JdoUtil.get().getPersistenceManager();
        query                 = persistentManager.newQuery(Subscription.class, queryParam);

        subscriptionJDOList.addAll((List<Subscription>) query.execute());
    }
    catch(Exception ex)
    {
        log.info("Subscription Exception while getting the the subscription JDOs ::"+ex.getMessage());
    }

return subscriptionJDOList;
}

但是我试图获取的 jdos 具有关键的 clientID，而不是 clientId。我试图杀死应用引擎实例并再次尝试。仍然没有解决。任何人都知道为什么会这样。

提前致谢！

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