Database design - google app engine

Question

I am working with google app engine and using the low leval java api to access Big Table. I\'m building a SAAS application with 4 layers:

• Client web browser

Answer 1

Here are a few app-engine specific factors that I think you'll have to contend with:

• When querying using an inequality, you can only use an inequality on one property. for example, if you are filtering on an appt date being between July 1st and July 4th, you couldn't also filter by price > 200

• Transactions on app engine are a bit tricky compared to the SQL database you are probably used to. You can only do transactions on entities that are in the same "entity group".