Connecting to SQL Database using SQLAlchemy in Python Last Updated : 21 Mar, 2023 Comments Improve Suggest changes Like Article Like Report In this article, we will see how to connect to an SQL database using SQLAlchemy in Python. To connect to a SQL database using SQLAlchemy we will require the sqlalchemy library installed in our python environment. It can be installed using pip - !pip install sqlalchemyThe create_engine() method of sqlalchemy library takes in the connection URL and returns a sqlalchemy engine that references both a Dialect and a Pool, which together interpret the DBAPI’s module functions as well as the behavior of the database. Syntax: sqlalchemy.create_engine(url, **kwargs) Parameters: url: str The connection URL to the database of type "dialect+driver://username:password@host:port/database". Example 1: For MySQL Database In this example, we have successfully created a connection to the MySQL database. Please note that we have created the database named 'GeekForGeeks' in the local instance of mySQL server with the password set as 'password'. The dialect and driver for establishing the connection to MySQL database are MySQL and pymysql respectively. Python # IMPORT THE SQALCHEMY LIBRARY's CREATE_ENGINE METHOD from sqlalchemy import create_engine # DEFINE THE DATABASE CREDENTIALS user = 'root' password = 'password' host = '127.0.0.1' port = 3306 database = 'GeeksForGeeks' # PYTHON FUNCTION TO CONNECT TO THE MYSQL DATABASE AND # RETURN THE SQLACHEMY ENGINE OBJECT def get_connection(): return create_engine( url="mysql+pymysql://{0}:{1}@{2}:{3}/{4}".format( user, password, host, port, database ) ) if __name__ == '__main__': try: # GET THE CONNECTION OBJECT (ENGINE) FOR THE DATABASE engine = get_connection() print( f"Connection to the {host} for user {user} created successfully.") except Exception as ex: print("Connection could not be made due to the following error: \n", ex) Output: $ Connection to the 127.0.0.1 for user root created successfully.Example 2: For PostgreSQL Database In this example, a sqlalchemy engine connection has been established with the PostgreSQL database. Please note that we have used the pre-existing database named 'postgres' that comes within the local instance of postgresql server. The dialect and driver for establishing the connection to MySQL database is postgres. Python # IMPORT THE SQALCHEMY LIBRARY's CREATE_ENGINE METHOD from sqlalchemy import create_engine # DEFINE THE DATABASE CREDENTIALS user = 'root' password = 'password' host = '127.0.0.1' port = 5432 database = 'postgres' # PYTHON FUNCTION TO CONNECT TO THE POSTGRESQL DATABASE AND # RETURN THE SQLACHEMY ENGINE OBJECT def get_connection(): return create_engine( url="postgresql://{0}:{1}@{2}:{3}/{4}".format( user, password, host, port, database ) ) if __name__ == '__main__': try: # GET THE CONNECTION OBJECT (ENGINE) FOR THE DATABASE engine = get_connection() print( f"Connection to the {host} for user {user} created successfully.") except Exception as ex: print("Connection could not be made due to the following error: \n", ex) Output: $ Connection to the 127.0.0.1 for user root created successfully. 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