SQLAlchemy ORM – Declaring Mapping The main objective of the Object Relational Mapper API of SQLAlchemy is to facilitate associating user-defined Python classes with database tables, and objects of those classes with rows in their corresponding tables. Changes in states of objects and rows are synchronously matched with each other. SQLAlchemy enables expressing database queries […]
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SQLAlchemy ORM – Adding Objects In the previous chapters of SQLAlchemy ORM, we have learnt how to declare mapping and create sessions. In this chapter, we will learn how to add objects to the table. We have declared Customer class that has been mapped to customers table. We have to declare an object of this […]
SQLAlchemy ORM – Creating Session In order to interact with the database, we need to obtain its handle. A session object is the handle to database. Session class is defined using sessionmaker() – a configurable session factory method which is bound to the engine object created earlier. from sqlalchemy.orm import sessionmaker Session = sessionmaker(bind = […]