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Python | Getting started with psycopg2-PostGreSQL

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  • Last Updated : 20 Feb, 2019
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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.

Step #1: Connection to PostGreSQL




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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