jpa relationship-Google app engine

Posted by megala on Stack Overflow See other posts from Stack Overflow or by megala
Published on 2010-05-21T06:34:08Z Indexed on 2010/05/21 6:40 UTC
Read the original article Hit count: 165

Filed under:

google-datastore

I created two tables in google appengine datastore using JPA.

Table1:

*groupname pk

*groupid

*groupdesc

*emailper

Table2:

*groupname

*memberid

*membername

My constraint is if i enter data into table2 it check whether group already exists or not in table.If exists than only it store the data into table .How to solve this?

Related posts about google-datastore

Google Datastore w/ JDO: Access Times?

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm hitting what appears (to me) strange behavior when I pull data from the google datastore over JDO. In particular, the query executes quickly (say 100 ms), but finding the size of the resulting List< takes about one second! Indeed, whatever operation I try to perform on the resulting list takes… >>> More
How to upload 6000 record to Google Datastore from csv file

as seen on Stack Overflow - Search for 'Stack Overflow'
http://code.google.com/appengine/docs/python/tools/uploadingdata.html is not clearly understand. Where i should call the bulkloader.py or appcfg.py? Should i import the csv file to local Google App Engine SDK first? How to keep the upload and download data process in existing application for datastore… >>> More
ArrayList throwing exception on retrieval from google datastore (with gwt, java)

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm using Google Web Toolkit with java and google datastore as database. The entity class has arraylist and on trying to retrieve the data from data base I'm getting the exception: Type 'org.datanucleus.sco.backed.ArrayList' was not included in the set of types which can be serialized by this SerializationPolicy… >>> More
google datastore - does it do lazy loading?

as seen on Stack Overflow - Search for 'Stack Overflow'
if I have a Customer object with a list of orders, declared using the db.ReferenceProperty after a while I may have huge amount of orders in there, if I pull the Customer object would I be in danger of pulling the complete set of orders? >>> More
From actionscript to google's datastore through java.

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm working on a flash game written in pure actionscript 3.0 in Flex. I've just finished implementing replays for the game, but want to store the top 10 hiscores' replay data on my google-app-engine'd website. I'm using Java for the app-engine stuff in Eclipse in java but I have no idea how to… >>> More

Developer IT

jpa relationship-Google app engine - Developer IT

jpa relationship-Google app engine

google-datastore

Related posts about google-datastore

Google Datastore w/ JDO: Access Times?

How to upload 6000 record to Google Datastore from csv file

ArrayList throwing exception on retrieval from google datastore (with gwt, java)

google datastore - does it do lazy loading?

From actionscript to google's datastore through java.

Categories cloud