[appengine-java] Re: how to build same entity group
Thanks to Chau Huynh. as you said, how to find all the list of telephone( has belong to a person )? because of these telephone can't sale again. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
[appengine-java] Re: how to build same entity group
now i have done it by part transaction. use case: Person buy three Telephone update Person property(and other sub class property) ---use transaction update three Telephone.person_id=person_id. not use transaction thanks to all -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
[appengine-java] Re: how to build same entity group
for instance, you can just use a Key and reference
the Person in the Telephone.
you are right. and i just do it as you say.
public class Telephone{
@PrimaryKey
@Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
@Extension(vendorName=datanucleus, key=gae.encoded-pk,
value=true)
private String telephone_id;
@Persistent
private String person_id; //this field point to Person
}
my question is
if person have telephone( telephone1,telephone2,telephone3) and user
update person's telephone is telephone2,telephone3,telephone4,how
to implements this?
but in a same transactions , I need update 2 telephone
object .--telephone1.person_id=null
telephone4.person_id=person_id.
and the 2 telephone object is not in same entity group.
the question seem to equalhow to update multi object (same
class) in same transaction?
Thank you for your help
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Re: [appengine-java] Re: how to build same entity group
As a non native English speaker also, let me guess If I got you correctly,
dreamy
You want to manipulate Telephone separately, independent of its-owner-to-be,
so you will have a Telephone class.
Similarly, you will have another class for Person.
Because there're no dependency between creating of Person and Telephone, you
will not need to put those in the same transaction (entity group, you thread
subject was a bit confused) - just check Ikai's explanation above.
Now your need to represent when user buys/exchanges some phones? Can you try
this:
class Person {
ListKey phones;
}
You might need to read relationship link above for more detail.
Thanks
On Thu, Mar 25, 2010 at 7:24 PM, dreamy dreamy2c...@gmail.com wrote:
for instance, you can just use a Key and reference
the Person in the Telephone.
you are right. and i just do it as you say.
public class Telephone{
@PrimaryKey
@Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
@Extension(vendorName=datanucleus, key=gae.encoded-pk,
value=true)
private String telephone_id;
@Persistent
private String person_id; //this field point to Person
}
my question is
if person have telephone( telephone1,telephone2,telephone3) and user
update person's telephone is telephone2,telephone3,telephone4,how
to implements this?
but in a same transactions , I need update 2 telephone
object .--telephone1.person_id=null
telephone4.person_id=person_id.
and the 2 telephone object is not in same entity group.
the question seem to equalhow to update multi object (same
class) in same transaction?
Thank you for your help
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Re: [appengine-java] Re: how to build same entity group
I'd consider why you need them in the same entity group. If you don't need transactions, for instance, you can just use a Key and reference the Person in the Telephone. On Tue, Mar 23, 2010 at 6:54 PM, dreamy dreamy2c...@gmail.com wrote: Hello Ikai L thanks for your reply. You just have to persist the Person first, or create a Person, attach Telephone entities, then call pm.makePersistent() on the Person. but this is problem. Telephone must not belong to Person. Telephone module manaer telephone create/update/delete/query , telphone have many active or property to be managered and then there is no idea of Person I need set Telephone.person only after this person have buy the telephone. there is any other idea ? thanks a lot -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en. -- Ikai Lan Developer Programs Engineer, Google App Engine http://googleappengine.blogspot.com | http://twitter.com/app_engine -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
[appengine-java] Re: how to build same entity group
Hello Ikai L thanks for your reply. You just have to persist the Person first, or create a Person, attach Telephone entities, then call pm.makePersistent() on the Person. but this is problem. Telephone must not belong to Person. Telephone module manaer telephone create/update/delete/query , telphone have many active or property to be managered and then there is no idea of Person I need set Telephone.person only after this person have buy the telephone. there is any other idea ? thanks a lot -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
