When you have a Connection object associated with a database, you can create a Cursor object.

Because both of these modules use the portable SQL database API interface, they are able to use the code in the doQuery() function without any modifications. This example creates a series of Connection objects that opens the same database using different PostgreSQL modules. M圜onnection = nnect( host=hostname, user=username, password=password, database=database ) M圜onnection = nnect( host=hostname, user=username, password=password, dbname=database ) # Simple routine to run a query on a database and print the results:Ĭur.execute( 'SELECT fname, lname FROM employee' )įor firstname, lastname in cur.fetchall() : In your own code, replace username with the PostgreSQL database username, password with the database user's password, and dbname with the database name: #!/usr/bin/python The sample code works with Python 2.7 and Python 3.x. The following sample Python code demonstrates how to do this, as well as just how easy it is to switch between the different SQL package implementations using the portable SQL database API. To install the PyGreSQL package, type the following command:Ĭode sample using Python's portable SQL database APIĪfter you install a PostgreSQL package in the virtual environment, you are ready to work with actual databases.

To install the psycopg2 package, type the following command:.

Type the command for the package you want to install: To update pip in the virtual environment, type the following command:

If you log out of your SSH session (or deactivate the virtual environment by using the deactivate command), make sure you reactivate the virtual environment before following the steps below and running the sample code. All of the following commands in this procedure assume that you are working within the virtual environment. The command prompt now starts with (sqlenv) to indicate that you are working in a Python virtual environment. To create a virtual environment, type the following commands:.To set up the Python virtual environment and install a PostgreSQL package, follow these steps: Setting up the Python virtual environment and installing a PostgreSQL package This means that if you switch from one module to another, you can reuse almost all of your existing code (the code sample below demonstrates how to do this).

PyGreSQL: This package contains the pgdb module.īoth of these packages support Python's portable SQL database API.

psycopg2: This package contains the psycopg2 module.

Code sample using Python's portable SQL database APIīefore you can access PostgreSQL databases using Python, you must install one (or more) of the following packages in a virtual environment:.

Setting up the Python virtual environment and installing a PostgreSQL package.

Connect postgres to python text editor