SQLDelight by square is an Android library that generates Java models from your SQL CREATE TABLE statements (and lots more). This is a full example from initial configuration to final code. Good read.
http://blog.alexsimo.com/delightful-persistence-android/
Tag: DB
My Core Data Stack
Another Core Data stack. This one is simple.
http://martiancraft.com/blog/2015/03/core-data-stack/