How do you connect to a database in Python?

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Nazia Khanum · Accepted Answer

Python Training: Connecting to a Database in Python

Introduction: If you're seeking Python Training or Python Training online coaching, you're in the right place. In this article, we will discuss how to connect to a database in Python. UrbanPro.com is the best online coaching platform to find experienced tutors and coaching institutes for Python Training.

I. Understanding Database Connectivity in Python Before diving into the process of connecting to a database in Python, it's essential to understand the basics.

II. Python Database Connectivity Libraries Python offers various libraries to connect to databases, but two of the most popular ones are:

SQLite: A built-in library for working with SQLite databases.
pymysql and mysql-connector-python: Libraries to connect to MySQL databases.
psycopg2: A library for PostgreSQL database connectivity.
pyodbc: For connecting to Microsoft SQL Server.

III. Steps to Connect to a Database: We'll discuss the general steps to connect to a database in Python. The specific steps may vary depending on the chosen database and library.

1. Import the Required Library:

Import the appropriate library based on the database you want to connect to.

2. Establish a Connection:

Use library functions to create a connection object.
Provide necessary connection parameters (e.g., hostname, username, password, database name).

3. Create a Cursor:

A cursor allows you to interact with the database.
Use the cursor() method provided by the library.

4. Execute SQL Queries:

You can execute SQL queries using the cursor object.
Use methods like execute(), fetchall(), and fetchone() to perform database operations.

5. Commit and Close:

After executing queries, commit the changes to the database using the commit() method.
Close the cursor and the connection when you're done.

IV. Code Example for SQLite: Here's a simple example using the SQLite database:

python

import sqlite3 # Establish a connection to a SQLite database (or create a new one) connection = sqlite3.connect("mydatabase.db") # Create a cursor cursor = connection.cursor() # Execute SQL queries cursor.execute("CREATE TABLE IF NOT EXISTS users (id INTEGER PRIMARY KEY, name TEXT)") cursor.execute("INSERT INTO users (name) VALUES ('John')") # Commit changes and close the connection connection.commit() connection.close()

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How do you connect to a database in Python?

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