postgreデータベースpython操作

1. python connect postgre
https://wiki.postgresql.org/wiki/Using_psycopg2_with_PostgreSQL          Using psycopg2 with PostgreSQL

import psycopg2

import pprint




# get a connection, if a connect cannot be made an exception will be raised here

conn = psycopg2.connect("dbname='db1' user='postgres' host='localhost' password='123'")# conn.cursor will return a cursor object, you can use this cursor to perform queries

cursor = conn.cursor()



# execute Query

cursor.execute("SELECT * FROM department")



# retrieve the records from the database

records = cursor.fetchall()

#records = cursor.fetchone()



# print out the records using pretty print

pprint.pprint(records)