2011/4/21 Vik
> Hie
>
> We are a NGO which runs online blood donor system. We want to send
> appreciation e-certificate to the person who donates blood in the form of
> PDF.
>
> So exactly what we can use to generate such certificates on the fly and
> mail to the donor whenever our system receive
2011/3/21 Jan Willies :
> I need to move a variable in my bean from type boolean to String. How
> would I do that in GAE/J? Are there any common practices?
>
> Also, how would I deal with the situation when I need to add a
> variable of type boolean or int? They are NULL for old
I need to move a variable in my bean from type boolean to String. How
would I do that in GAE/J? Are there any common practices?
Also, how would I deal with the situation when I need to add a
variable of type boolean or int? They are NULL for old entities which
were stored previously and therefore
2011/2/6 Cyrille Vincey
> Some time ago, relationships between entities of same kind were not
> supported by the datastore.
> This was annoying in particular when trying to movel tree structures
> (@OneToMany relationship between MyClass and MyClass).
> The datastore documentation was pretty clea
2011/1/27 Jan Willies
> Hi,
>
> I can't have my child-object have an order. The following code fails
> with:
>
> javax.jdo.JDOFatalUserException: Detected attempt to establish
> Topic(2) as the parent of SubTopic(9) but the entity identified by
> SubTopic(9) has alr
Hi,
I can't have my child-object have an order. The following code fails
with:
javax.jdo.JDOFatalUserException: Detected attempt to establish
Topic(2) as the parent of SubTopic(9) but the entity identified by
SubTopic(9) has already been persisted without a parent. A parent
cannot be established
