问题
I have seen a little of this in stack overflow but I am wondering if there is any reason to use the DB entity model and what the specific pros and cons of using on or the other are.
I have read the ndb is a little faster and that it helps with caching. They have a good bit of info in the docs but don't really straight out say that ndb is better. At least I haven't found that yet.
回答1:
As far as I can tell ndb is an evolution of db, kept seperate to maintain compatability.
Have a look at the cheat sheet, it details the main differences
https://docs.google.com/document/d/1AefylbadN456_Z7BZOpZEXDq8cR8LYu7QgI7bt5V0Iw/mobilebasic
But it does not mention the other features such as computed properties.
If you are starting a new project I see no reason not to use ndb and every reason to.
EDIT: Alt link for document: https://docs.google.com/document/d/1AefylbadN456_Z7BZOpZEXDq8cR8LYu7QgI7bt5V0Iw/edit#
来源：https://stackoverflow.com/questions/12852442/pros-and-cons-of-db-and-ndb-in-google-app-engine