What is "name=" for in Google App Engine Data Store Key Field

Question

The User class is defined as below

 @PersistenceCapable(detachable="true")
public class User {
    @PrimaryKey
    @Persistent
    private String email;

    @Persistent
    private String firstname;

    @Persistent
    private String lastname;

In PROD, I added a user with email="[email protected]", firstname=something, lastname=something via JDO. Then in Datastore Viewer, the ID/Name field has a value of "[email protected]". Why was "Name=" added? My program cannot find user with key = "[email protected]". It can in my DEV PC though where there is never "Name=".

[Added source code of retrieving a User instance] It works well in my DEV PC.

    public static User getUser(String email){
    PersistenceManager pm = PMF.get().getPersistenceManager();
    User user, detached = null;
    try {
        user = pm.getObjectById(User.class,
            email);

        // If you're using transactions, you can call
        // pm.setDetachAllOnCommit(true) before committing to automatically
        // detach all objects without calls to detachCopy or detachCopyAll.
        detached = pm.detachCopy(user);
    } 
    catch(Exception e){
        e.printStackTrace();
    }
    finally {
        pm.close();
    }
    return detached;
}

enter image description here

![enter image description here][2]

Hanuman Hanuman · Accepted Answer · 2014-06-30T23:55:47

Since the id can be either an auto-generated number or a custom string, "name=" is there to make it clear the id is a string (otherwise you would get a "id=").

As for not finding the user, the problem must be in how the query is made, so we would need more insight into your code to figure it out.

What is "name=" for in Google App Engine Data Store Key Field

1 Answers