When you want to connect to a database in SQLAlchemy, you need a connection string. It usually has the form
Quite often, the
root and the
Once you have the valid connection string, you can test if it works via this script:
import sqlalchemy engine = sqlalchemy.create_engine(SQLALCHEMY_DATABASE_URI, echo=True) print(engine.table_names())
SQLALCHEMY_DATABASE_URI = 'sqlite:///absolute_filepath' # Example: SQLALCHEMY_DATABASE_URI = 'sqlite:////tmp/test.db'
The first two slashes come from the seperator of dialect and driver, the third one from the separation between credentials+host and dbname, the fourth one is the path which is kind of the name of the database.
If you want an in-memory SQLite DB, just specify an empty URL (source):
SQLALCHEMY_DATABASE_URI = 'sqlite://'
MySQL and MariaDB
SQLALCHEMY_DATABASE_URI = 'mysql+pymysql://user:[email protected]/dbname'
There are a lot of other MySQL drivers:
mysqldb: C extension; does not work with Python 3 (reasons for pymysql)
mysqlconnector: Officially provided by MySQL; worst performance and not downloadable via PyPI (source)
I haven't tried it, but sqlalchemy lists more like Oracle, Microsoft SQL Server and Sybase.