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Inserting data into a new column of an already existing table in MySQL using Python
  • Last Updated : 24 Feb, 2021

Prerequisite: Python: MySQL Create Table

In this article, we are going to see how to Inserting data into a new column of an already existing table in MySQL using Python. Python allows the integration of a wide range of database servers with applications. A database interface is required to access a database from Python. MySQL Connector Python module is an API in python for communicating with a MySQL database. 

Database table in use:

We are going to use geeks(Database name) database and table describing the salary.



Approach:

  • Import module.
  • Make a connection request with the database.
  • Create an object for the database cursor.
  • Execute the following MySQL query:
ALTER TABLE person
ADD salary int(20);
UPDATE persons SET salary = '145000' where Emp_Id=12;
  • And print the result.

Before starting let do the same in SQL:

Step 1: Create a new column with alter command.

ALTER TABLE table_name ADD column_name datatype;

Step 2: Insert data in a new column.

Below is the full implementation in python:

Python3




# Establish connection to MySQL database
import mysql.connector
  
db = mysql.connector.connect(
    host="localhost",
    user="root",
    password="root123",
    database="geeks"
)
  
# getting the cursor by cursor() method
mycursor = db.cursor()
query_1 = "ALTER TABLE person ADD salary int(20);"
query_2 = "UPDATE persons SET salary = '145000' where Emp_Id=12;"
  
# execute the queries
mycursor.execute(query_1)
mycursor.execute(query_2)
  
mycursor.execute("select * from persons;")
myresult = mycursor.fetchall()
for row in myresult:
    print(row)
  
db.commit()
  
# close the Connection
db.close()

Output:


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