[google-appengine] JDOObjectNotFound exception when using getObjectById
Hi All,
I am stuck with a very weird case here while using getObjectById() function,
I have a persistent class called Category and i am saving it to appengine
datastore using JDO.
I have tried to fetch a particular entry using query and getObjectById()
method, the query is passing and returning me the correct results but
getObjectById is throwing exception JDOObjectNotFound.
The Category class have a primary key field called id, a parent key and a
child key. the child and parent are actually primary key of other Category
instances.( I am trying to buuld a heirarchy of similar objects here. I am
using unowned one to many relationship here.)
// In following code we get the Id of parent and remove the child's
information from it.
Long id = e.getParent(); // returns parent Id.
Query query = pm.newQuery(Category.class);
query.setFilter(id == cat_id); // get the Category with primary key id =
cat_id.
query.declareParameters(Long cat_id);
ListCategory results = (ListCategory) query.execute(id); // get parent
category. results contain the expected information.
if (results.iterator().hasNext()) {
for (Category e3 : results) {
SetLong child = e3.getChildrens(); // get the childrens.
}
}
Category e2 = (Category) pm.getObjectById(id); // throws JDOObjectNotFound
exception. It is expected to contain the same information as in results 1st
element.
e2.removeChildren(e.getId());
pm.deletePersistent(e);
As you must have seen in the code i am fetching same id using the query and
it returning me the expected objects while
the getObjectById is throwing the exception JDOObjectNotFound. Any clues why
it is throwing that exception.
I tried to google it but could not find any obvious reason,
Can somebody help me figuring out where I am doing it wrong.
Regards,
Vijay
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[google-appengine] JDOObjectNotFound exception when using getObjectById
Hi All,
I am stuck with a very weird case here while using getObjectById() function,
I have a persistent class called Category and i am saving it to appengine
datastore using JDO.
I have tried to fetch a particular entry using query and getObjectById()
method, the query is passing and returning me the correct results but
getObjectById is throwing exception JDOObjectNotFound.
The Category class have a primary key field called id, a parent key and a
child key. the child and parent are actually primary key of other Category
instances.( I am trying to buuld a heirarchy of similar objects here. I am
using unowned one to many relationship here.)
// In following code we get the Id of parent and remove the child's
information from it.
Long id = e.getParent(); // returns parent Id.
Query query = pm.newQuery(Category.class);
query.setFilter(id == cat_id); // get the Category with primary key id =
cat_id.
query.declareParameters(Long cat_id);
ListCategory results = (ListCategory) query.execute(id); // get parent
category. results contain the expected information.
if (results.iterator().hasNext()) {
for (Category e3 : results) {
SetLong child = e3.getChildrens(); // get the childrens.
}
}
Category e2 = (Category) pm.getObjectById(id); // throws JDOObjectNotFound
exception. It is expected to contain the same information as in results 1st
element.
e2.removeChildren(e.getId());
pm.deletePersistent(e);
As you must have seen in the code i am fetching same id using the query and
it returning me the expected objects while
the getObjectById is throwing the exception JDOObjectNotFound. Any clues why
it is throwing that exception.
I tried to google it but could not find any obvious reason,
Can somebody help me figuring out where I am doing it wrong.
Regards,
Vijay
--~--~-~--~~~---~--~~
You received this message because you are subscribed to the Google Groups
Google App Engine group.
To post to this group, send email to google-appengine@googlegroups.com
To unsubscribe from this group, send email to
google-appengine+unsubscr...@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/google-appengine?hl=en
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