Example: Common Operations

import psycopg2

# Common connection modes of psycopg2
1. conn = psycopg2.connect(dbname="postgres", user="user", password="password", host="localhost", port=port)
2. conn = psycopg2.connect("dbname=postgres user=user password=password  host=localhost port=port")

# Create a connection object.
conn=psycopg2.connect(database="postgres",user="user",password="password",host="localhost",port=port)
cur=conn.cursor() # Create a pointer object.

# Create a connection object (using SSL).
conn = psycopg2.connect(dbname="postgres", user="user", password="password", host="localhost", port=port,
         sslmode="verify-ca", sslcert="client.crt",sslkey="client.key",sslrootcert="cacert.pem")
Note: sslcert, sslkey, and sslrootcert indicate the file paths of the user certificate, user private key, and root certificate, respectively. If no value is assigned, the client.crt, client.key, and root.crt files in the ~/.postgresql directory are used by default.

# Create a table.
cur.execute("CREATE TABLE student(id integer,name varchar,sex varchar);")

# Insert data.
cur.execute("INSERT INTO student(id,name,sex) VALUES(%s,%s,%s)",(1,'Aspirin','M'))
cur.execute("INSERT INTO student(id,name,sex) VALUES(%s,%s,%s)",(2,'Taxol','F'))
cur.execute("INSERT INTO student(id,name,sex) VALUES(%s,%s,%s)",(3,'Dixheral','M'))

# Obtain the result.
cur.execute('SELECT * FROM student')
results=cur.fetchall()
print (results)

# Close the connection.
conn.commit()
cur.close()
conn.close()

# Use logs.
import logging
import psycopg2
from psycopg2.extras import LoggingConnection

logging.basicConfig(level=logging.DEBUG) # Log level
logger = logging.getLogger(__name__)

db_settings = {
    "user": "user",
    "password": "password",
    "host": "localhost",
    "database": "postgres",
    "port": port
}
conn = psycopg2.connect(connection_factory=LoggingConnection, **db_settings)
conn.initialize(logger)