PostgreSQL is a powerful, open source object-relational database system. PostgreSQL runs on all major operating systems. PostgreSQL follows ACID property of DataBase system and has the support of triggers, updatable views and materialized views, foreign keys.
To connect PostgreSQL we use psycopg2 . It is the best and most friendly Database adapter in python language. It is both Unicode and Python3 friendly.
Installation Required –
pip install psycopg2
Let’s get started and understand PostgreSQL connection in parts.
import psycopg2 conn = psycopg2.connect(database ="gfgdb", user = "gfguser", password = "passgeeks", host = "52.33.0.1", port = "5432") print("Connection Successful to PostgreSQL") |
Step #2: Declare Cursor
Allows Python code to execute PostgreSQL command in a database session.
cur = conn.cursor() |
Step #3: Write your SQL Query and execute it.
query = """select name, email from geeks_members;"""cur.execute(query) rows = cur.fetchall() # Now 'rows' has all data for x in rows: print(x[0], x[1]) |
Step #4: Close the connection
conn.close() print('Connection closed') |
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