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Configuring SQLAlchemy with PostgreSQL on Heroku: A Quick Guide

Code November 08, 2024
python

  • When you provision a PostgreSQL database on Heroku, it sets an environment variable called DATABASE_URL with the connection string for your database.
  • This URI uses the format postgres://.
  • SQLAlchemy (especially when using the psycopg2 driver for PostgreSQL) requires the URI to be in the format postgresql+psycopg2://.
  • This prefix specifies the dialect (postgresql) and the driver (psycopg2) explicitly, which SQLAlchemy uses to establish the connection.

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