Sqlalchemy Configuration Development Tutorials, Guides & Insights
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Configuring SQLAlchemy with PostgreSQL on Heroku: A Quick Guide
- SQLAlchemy (especially when using the
psycopg2driver for PostgreSQL) requires the URI to be in the formatpostgresql+psycopg2://. - This prefix specifies the dialect (
postgresql) and the driver (psycopg2) explicitly, which SQLAlchemy uses to establish the connection.
Heroku's DATABASE_URL uses the older postgres:// scheme, which isn't compatible with the latest SQLAlchemy requirements. Starting with SQLAlchemy 1.4, postgres:// is considered deprecated and no longer supported. The explicit postgresql+psycopg2:// scheme is required.
Nov 08, 2024
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