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.Â
Database table in use:
We are going to use Lazyroar(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 databaseimport mysql.connector  db = mysql.connector.connect(    host="localhost",    user="root",    password="root123",    database="Lazyroar")  # getting the cursor by cursor() methodmycursor = db.cursor()query_1 = "ALTER TABLE person ADD salary int(20);"query_2 = "UPDATE persons SET salary = '145000' where Emp_Id=12;"  # execute the queriesmycursor.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 Connectiondb.close() |
Output:
