Python – Import CSV into PostgreSQL

In this article, we will see how to import CSV files into PostgreSQL using the Python package psycopg2.

First, we import the psycopg2 package and establish a connection to a PostgreSQL database using the pyscopg2.connect() method. before importing a CSV file we need to create a table. In the example below, we created a table by executing the “create table” SQL command using the cursor.execute() method.

'''CREATE TABLE DETAILS(employee_id int NOT NULL,
                        employee_name char(20), 
                        employee_email varchar(30),
                        employee_salary float);'''

View of the empty table:

Table Description

After creating the table we need to execute the “copy” command in the SQL form. in the copy command, we need to specify the path of the CSV file. 

CSV File Used:

CSV File Used

'''COPY table_name
FROM 'C:\folder\file.csv' 
DELIMITER ',' 
CSV HEADER;'''

Below is the implementation:

Python3

import psycopg2

conn = psycopg2.connect(database="EMPLOYEE_DATABASE",
                        user='postgres', password='pass',
                        host='127.0.0.1', port='5432'
)

conn.autocommit = True
cursor = conn.cursor()


sql = '''CREATE TABLE DETAILS(employee_id int NOT NULL,\
employee_name char(20),\
employee_email varchar(30), employee_salary float);'''


cursor.execute(sql)

sql2 = '''COPY details(employee_id,employee_name,\
employee_email,employee_salary)
FROM '/private/tmp/details.csv'
DELIMITER ','
CSV HEADER;'''

cursor.execute(sql2)

sql3 = '''select * from details;'''
cursor.execute(sql3)
for i in cursor.fetchall():
    print(i)

conn.commit()
conn.close()

Output:

(1, 'rajesh              ', 'rajesh89@gmail.com', 60000.0)
(2, 'pratyusha           ', 'praty@gmail.com', 75000.0)
(3, 'pratibha            ', 'pratibhaJ@gmail.com', 65000.0)