In this article, we will discuss how to Insert a Python list into PostgreSQL database using pyscopg2 module.
Psycopg2 is the most popular PostgreSQL adapter for the Python programming language. Psycopg2 is a DB API 2.0 compliant PostgreSQL driver that is actively developed. It is designed for multi-threaded applications and manages its own connection pool. This module can be installed using the given command:
pip install psycopg2
To insert all records the list is traversed and the values are inserted one by one.
Syntax :
list = [(),(),.....,()]
for d in list:
cursor.execute("INSERT into table_name(
column1,column2, column3.....) VALUES (%s, %s, %s,.....)", d)
First import all the required libraries into the working space and establish database connection. Set auto-commit to false and create a cursor object. Now, create a list of data to be inserted into the table. Loop through the list and insert values. Commit and close connection.
Example: Inserting list values to database
Python3
# importing psycopg2 moduleimport psycopg2# establishing the connectionconn = psycopg2.connect( database="postgres", user='postgres', password='password', host='localhost', port='5432')# creating a cursor objectcursor = conn.cursor()# creating tablesql = '''CREATE TABLE employee( id SERIAL NOT NULL, name varchar(20) not null, state varchar(20) not null)'''# list that contain records to be inserted into tabledata = [('Babita', 'Bihar'), ('Anushka', 'Hyderabad'), ('Anamika', 'Banglore'), ('Sanaya', 'Pune'), ('Radha', 'Chandigarh')]# inserting record into employee tablefor d in data: cursor.execute("INSERT into employee(name, state) VALUES (%s, %s)", d)print("List has been inserted to employee table successfully...")# Commit your changes in the databaseconn.commit()# Closing the connectionconn.close() |
Output:
List has been inserted into employee table successfully
Example: Check whether data is being shown in the employee table or not.
Python3
# importing psycopg2 moduleimport psycopg2# establishing the connectionconn = psycopg2.connect( database="postgres", user='postgres', password='password', host='localhost', port='5432')# creating cursor objectcursor = conn.cursor()# query to sort table by namesql2 = 'select * from employee;'# executing querycursor.execute(sql2)# fetching the resultprint(cursor.fetchall())# Commit your changes in the databaseconn.commit()# Closing the connectionconn.close() |
Output
[(1, ‘Babita’, ‘Bihar’), (2, ‘Anushka’, ‘Hyderabad’), (3, ‘Anamika’, ‘Banglore’), (4, ‘Sanaya’, ‘Pune’), (5, ‘Radha’, ‘Chandigarh’)]
