Chapter 3. Database Abstraction Layer

In this chapter, we will cover the following recipes:

• Creating a new model

• Creating a model from a csv file

• Batch upload of your data

• Moving your data from one database to another

• Creating a model from existing MySQL and PostgreSQL databases

• Efficiently searching by tag

• Accessing your database from multiple applications

• Hierarchical category tree

• Creating records on demand

• OR, LIKE, BELONGS, and more on Google App Engine

• Replacing slow virtual fields with DB views