Hi,
I am new to GAE and especially for Datastore (JDO)
I have an Object Composition : User object has a reference of Contact
object.
I am able to store them in datastore.. but with same username as primary
key.. can someone point out where is the problem in code?
Here is the code snippet..
//User class
@PersistenceCapable (identityType = IdentityType.APPLICATION)
public class User{
@PrimaryKey
@Persistent (valueStrategy = IdGeneratorStrategy.IDENTITY)
String username;
@Persistent
Contact contact;
//getters and setters
}
// Contact class
@PersistenceCapable (identityType = IdentityType.APPLICATION)
public class Contact {
@PrimaryKey
@Persistent (valueStrategy = IdGeneratorStrategy.IDENTITY)
private Key username;
@Persistent
String Phone1;
}
//DAO class
public void register() {
User user = new User();
user.setUserName("abc");
Contact contact=new Contact();
contact.setEmail("[email protected]");
user.setContact(contact);
pm.makePersistent(user);
}
If I call this register method twice ( or equivalent to submit a
registration form twice with same set of username and email id !!) ,the
datastore is not complaining about duplicate key Exception..
Since I am creating "username" as my KEY I am expecting to get duplicate
key Exception. But why this is not happening?
-thanks
Ma
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