How do you access a database in Python?

Python >   Python Database Connectivity >   Database Connectivity 1- Connect to Database and create Table  

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Answer:

There are several ways to access a database in Python, depending on the type of database and your specific needs. Some of the most common ways are:

1. Using a database API: Many databases have a specific API that you can use to interact with the database. For example, if you're using a relational database like MySQL or PostgreSQL, you can use a Python library like MySQL Connector or psycopg2 to connect to the database and perform CRUD (Create, Read, Update, Delete) operations.

2. Using an Object-Relational Mapping (ORM) library: An ORM library allows you to interact with the database using objects, rather than writing raw SQL statements. Python has several popular ORM libraries, including SQLAlchemy, Django ORM, and peewee.

3. Using raw SQL statements: You can also interact with the database using raw SQL statements, either by executing them directly in the database or by using a Python library like sqlite3 to execute the statements.

Here is an example of how you can use the sqlite3 library to access a SQLite database in Python:

import sqlite3

# Connect to the database
conn = sqlite3.connect("example.db")

# Create a cursor
cursor = conn.cursor()

# Execute a SQL query
cursor.execute("SELECT * FROM users")

# Fetch the results
results = cursor.fetchall()

# Loop through the results
for row in results:
    print(row)

# Commit the changes and close the connection
conn.commit()
conn.close()

This example connects to an SQLite database, creates a cursor, executes a SELECT query, and fetches the results. The results are then looped through and printed to the console. Finally, the changes are committed and the connection is closed.

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