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Developer tools · #sqlalchemy
A decision guide for SQLAlchemy ORM loading strategies in paginated endpoints, explaining why selectinload prevents N+1 queries and row duplication.
Stop the N+1 query bottleneck in SQLAlchemy. Learn when to use joinedload, subqueryload, and selectinload to optimize database performance without causing Cartesian products.
Hybrid properties in SQLAlchemy let a single attribute act as both a Python property and a SQL expression. Learn how to define, use, and index them for clean, efficient queries.
Compare Offset and Keyset pagination in SQLAlchemy. Learn when to use .offset() versus .filter() to avoid performance degradation in large datasets.
Stop leaking database connections in FastAPI. Learn how to use 'yield' dependencies to automate session setup and teardown for every request.
Google Colab ↔ Cloud SQL: Diagnosing Intermittent Connection Pool Exhaustion In a Colab notebook that uses SQLAlchemy to query a Cloud SQL instance, the default pool_size of five often leads to “Connection pool exhausted” errors when several threads issue queries concurrently. The Cloud SQL instance has a max_connections limit that may be reached if the pool
Goal: Determine whether SQLAlchemy offers a unified mechanism to enforce hostname verification for SSL/TLS connections when using different database backends such as PostgreSQL (psycopg2) and MySQL (PyMySQL/mysqlclient). Constraint: SQLAlchemy passes SSL-related keys in connect_args directly to the underlying DBAPI, which interprets them differently; there i
Symptom A server-side paginated listing built on SQLAlchemy ORM (2.0-style select() with Session.execute() ) needs to show page numbers plus a total result count. The query applies limit() / offset() and also eager-loads a one-to-many collection with joinedload() . Observed behavior to diagnose With SQL echoing enabled, the generated statement wraps everythi
Goal The goal is to run SQLAlchemy integration tests that exercise ORM behavior without exposing any production database credentials. Constraints and uncertainty Tests must remain isolated, avoid credential leakage in logs, and run quickly in CI. Using an in‑memory SQLite engine (sqlite:///:memory:) satisfies the credential‑free requirement but lacks Postgre
python
fastapi
googlecolab
mysql
sqlite