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Working With SQLAlchemy

Working With SQLAlchemy

Learn how to start using SQL databases in Python.

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Managing database with SQLAlchemy

First, install SQLAlchemy using pipenv install sqlalchemy.

Let’s say we want to track our favorite books. We know each book by its title and author, and also want to track whether it’s available to lend to a friend. First, we create a class that represents the table. Each instance of the class, that is, each object, will be an individual book.

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from sqlalchemy import create_engine, Column, types 
from sqlalchemy.ext.declarative import declarative_base 
from sqlalchemy.orm import sessionmaker
connection_string = "sqlite:///database.db"
db   = create_engine(connection_string)
base = declarative_base()
class Book(base):
  __tablename__ = 'books'
  id = Column(types.Integer, primary_key=True)
  author = Column(types.String(length=50))
  title = Column(types.String(length=120), nullable=False) 
  available = Column(types.Boolean, nullable=False)
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