Python Syntax

Installing “python-mysql” connector

To use MySQL with Python, you typically need to install a MySQL connector or library. Here are the general steps to install it −

Step 1: Install MySQL Server

Make sure you have MySQL Server installed on your machine or have access to a remote MySQL server.

Step 2: Install MySQL Connector for Python

Open a command prompt or terminal and use the following command to install the MySQL Connector for Python using pip, which is the package installer for Python:

pip install mysql-connector-python

If you are using Python 3, you might need to use ‘pip3’ instead of ‘pip’.

Step 3: Verify Installation

After the installation is complete, you can verify that the library is installed by opening a Python interactive shell and trying to import the connector:

import mysql.connector

Python Functions to Access MySQL

When working with MySQL in Python, the ‘mysql-connector-python’ library provides various functions to interact with a MySQL database. Here are some important functions commonly used −

S.No	Function & Description
1	connect()Establishes a connection to the MySQL server.
2	cursor()Creates a cursor object to execute SQL queries.
3	execute(query, params=None)Executes a SQL query. ‘params’ is an optional parameter for query parameters.
4	fetchone()Fetches the next row from the result set.
5	fetchall()Fetches all rows from the result set.
6	commit()Commits the current transaction to the database.
7	rollback()Rolls back the current transaction, undoing any changes since the last commit.
8	close()Closes the cursor and the connection to the database.
9	executemany()Executes a SQL command against all parameter sequences in the provided list.

Basic Example

To connect and communicate with a MySQL database using Python, you can follow these steps −

• Use ‘pip install mysql-connector-python’ to install the MySQL Connector for Python.
• Import the MySQL Connector module in your Python script: “import mysql.connector”.
• Create a connection using “mysql.connector.connect()” with your database details.
• Create a cursor using “connection.cursor()”.
• Use the cursor’s “execute()” method to run SQL queries.
• If applicable, use “fetchone()” or “fetchall()” to retrieve query results.
• If you modify data, commit changes using “connection.commit()”.
• Close the cursor and connection with “cursor.close()” and “connection.close()”.

The following example shows a generic syntax of a Python program to call any MySQL query −

import mysql.connector # Establish connection connection = mysql.connector.connect(host='localhost', user='user', password='pass', database='db')# Create cursor cursor = connection.cursor()# Execute query cursor.execute("SELECT * FROM table")# Fetch and print results rows = cursor.fetchall()print(rows)# Close cursor and connection cursor.close() connection.close()Print Page