{"id":10258,"library":"sqlalchemy-vertica","title":"SQLAlchemy Vertica Dialect","description":"SQLAlchemy-Vertica provides a dialect for connecting SQLAlchemy to Vertica databases, leveraging the `vertica-python` driver. It allows users to interact with Vertica using SQLAlchemy's ORM and SQL Expression Language. The current version is 0.0.5, and the project appears to be in maintenance mode with infrequent updates.","status":"maintenance","version":"0.0.5","language":"en","source_language":"en","source_url":"https://github.com/lv10/sqlalchemy-vertica","tags":["database","SQLAlchemy","Vertica","dialect"],"install":[{"cmd":"pip install sqlalchemy-vertica","lang":"bash","label":"Install `sqlalchemy-vertica`"}],"dependencies":[{"reason":"Core ORM and SQL expression language.","package":"SQLAlchemy","optional":false},{"reason":"Underlying Python driver for Vertica connections.","package":"vertica-python","optional":false}],"imports":[{"note":"The `sqlalchemy-vertica` dialect auto-registers upon installation. You typically only need to import `create_engine` from SQLAlchemy itself and specify the dialect in your connection string.","symbol":"create_engine","correct":"from sqlalchemy import create_engine"}],"quickstart":{"code":"import os\nfrom sqlalchemy import create_engine, text\n\n# Replace with your actual Vertica connection details\n# It's recommended to use environment variables for sensitive info.\nVERTICA_USER = os.environ.get(\"VERTICA_USER\", \"dbadmin\")\nVERTICA_PASSWORD = os.environ.get(\"VERTICA_PASSWORD\", \"password\")\nVERTICA_HOST = os.environ.get(\"VERTICA_HOST\", \"localhost\")\nVERTICA_PORT = os.environ.get(\"VERTICA_PORT\", \"5432\")\nVERTICA_DATABASE = os.environ.get(\"VERTICA_DATABASE\", \"VMART\")\n\nconnection_string = (\n    f\"vertica+vertica_python://{VERTICA_USER}:{VERTICA_PASSWORD}\"\n    f\"@{VERTICA_HOST}:{VERTICA_PORT}/{VERTICA_DATABASE}\"\n)\n\ntry:\n    engine = create_engine(connection_string)\n    with engine.connect() as connection:\n        # Example: Execute a simple query\n        result = connection.execute(text(\"SELECT 1 as test_col\"))\n        print(f\"Connection successful! Result: {result.scalar()}\")\nexcept Exception as e:\n    print(f\"Failed to connect or execute query: {e}\")\n","lang":"python","description":"This quickstart demonstrates how to establish a connection to a Vertica database using `sqlalchemy-vertica` and execute a simple SQL query. Ensure `VERTICA_USER`, `VERTICA_PASSWORD`, `VERTICA_HOST`, `VERTICA_PORT`, and `VERTICA_DATABASE` are correctly configured, preferably via environment variables for production systems."},"warnings":[{"fix":"Review GitHub issues/PRs for similar problems or consider contributing fixes. Test against your specific SQLAlchemy and Vertica versions.","message":"The `sqlalchemy-vertica` dialect has not been actively developed since 2021 (v0.0.5). It may not fully support newer features of SQLAlchemy (e.g., 2.0+ specific patterns) or be compatible with very recent Vertica database versions. Users should test thoroughly if using with latest SQLAlchemy or Vertica releases.","severity":"gotcha","affected_versions":"<=0.0.5"},{"fix":"For specific column definitions, explicitly define `sqlalchemy.types` (e.g., `Column('name', String(255))`) instead of relying solely on inferred types.","message":"Vertica's specific data type behaviors, such as `TEXT` often behaving like `VARCHAR(MAX)` or character sets, might lead to unexpected mapping issues with SQLAlchemy's generic types. Explicit type casting or using `sqlalchemy.types.VARCHAR` with a length might be necessary.","severity":"gotcha","affected_versions":"<=0.0.5"},{"fix":"When using Vertica-specific SQL, wrap your statement in `sqlalchemy.text()` and execute it directly via the connection.","message":"Vertica includes non-standard SQL constructs (e.g., `COPY` statements, `CREATE TABLE AS SELECT WITH NO DATA`). These are typically not directly supported by SQLAlchemy's ORM and often require executing raw SQL using `connection.execute(text('YOUR VERTICA SQL HERE'))`.","severity":"gotcha","affected_versions":"<=0.0.5"}],"env_vars":null,"last_verified":"2026-04-17T00:00:00.000Z","next_check":"2026-07-16T00:00:00.000Z","problems":[{"fix":"Ensure `pip install sqlalchemy-vertica` has been run in the active Python environment. Verify that `vertica-python` is also installed.","cause":"The `sqlalchemy-vertica` package (or its dependency `vertica-python`) is not installed or the Python environment is incorrect.","error":"sqlalchemy.exc.NoSuchModuleError: Can't load plugin: sqlalchemy.dialects:vertica.vertica_python"},{"fix":"Check the `VERTICA_HOST` and `VERTICA_PORT` in your connection string. Verify network connectivity to the Vertica server and ensure the server is running and accessible.","cause":"The Vertica database server is not reachable at the specified host and port, or is not running. This could be due to network issues, incorrect hostname/IP, or an inactive database.","error":"OperationalError: (vertica_python.errors.QueryError) failed to connect: [Errno 111] Connection refused"},{"fix":"Double-check the `VERTICA_USER` and `VERTICA_PASSWORD` in your connection string for accuracy.","cause":"Incorrect username or password provided in the connection string.","error":"OperationalError: (vertica_python.errors.QueryError) Password authentication failed for user \"your_user\""}]}