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Beginner Tutorials: Relational Databases & RESTful APIs

Master data persistence with SQLite database tutorials and build scalable architectures with REST API standards. Includes interactive Python code sandboxes, flowcharts, unit testing suites, and complete installation guides for Windows, Mac, and Linux.

SQLite Database Tutorials

Select any tutorial script below to inspect its Python source code:

connect_db.py DB Connection
Python 3 Standard Library
Module Purpose: Establishes database connection with sqlite3.connect(), initializes cursor, and closes connections safely. 
"""
SQLite Connection Demonstration Module.

This script demonstrates connecting to an SQLite database, initializing a cursor,
and safely closing the database connection.

Note: Do NOT name python files 'sqlite3.py' to prevent shadowing the standard library module.
"""

import sqlite3
from typing import Optional


def connect_database(db_name: str = "mydatabase.db") -> Optional[sqlite3.Connection]:
    """Connect to SQLite database file.

    Args:
        db_name (str): Database file path or name.

    Returns:
        Optional[sqlite3.Connection]: SQLite connection object if successful.
    """
    try:
        # Establish connection to the database
        connection = sqlite3.connect(db_name)
        # Initialize cursor for executing queries
        cursor = connection.cursor()
        print(f"Successfully connected to database '{db_name}'.")

        # Close database connection
        connection.close()
        print("Database connection closed successfully.")
        return connection
    except sqlite3.Error as error:
        print(f"Error connecting to database: {error}")
        return None


def create_connection(db_name: str = "mydatabase.db"):
    """Create and return an active SQLite connection and cursor.

    Args:
        db_name (str): Database file path or name.

    Returns:
        Tuple[sqlite3.Connection, sqlite3.Cursor]: Active connection and cursor tuple.
    """
    connection = sqlite3.connect(db_name)
    cursor = connection.cursor()
    return connection, cursor


def close_connection(connection: sqlite3.Connection) -> None:
    """Safely close active SQLite connection."""
    if connection:
        connection.close()


if __name__ == "__main__":
    connect_database()
Ready (Python 3.12 Active)
🖥️ Execution Output & Test Results stdout 
Click "▶ Run Code" to execute this SQLite script or "🧪 Run Unit Tests" to verify with pytest.

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