Initial commit: Tablet lending system with user-tablet many-to-many relationship
- Database schema: tablets, users, loans (junction table) - CLI app: minimal_app.py - Web apps: app.py (Flask), simple_app.py (http.server) - Features: loan management, search, user loans view, project notes - Git structure: CONTRIBUTING.md, .gitignore Generated by Mistral Vibe. Co-Authored-By: Mistral Vibe <vibe@mistral.ai>
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ijuanes
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minimal_app.py
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296
minimal_app.py
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#!/usr/bin/env python3
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"""
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Minimal Tablet Lending and Return Management System
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Using only built-in Python modules
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"""
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import sqlite3
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from datetime import datetime
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def init_db():
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"""Initialize database with required tables"""
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conn = sqlite3.connect('tablets.db')
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cursor = conn.cursor()
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# Create tables
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cursor.execute('''
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CREATE TABLE IF NOT EXISTS tablets (
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id INTEGER PRIMARY KEY AUTOINCREMENT,
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brand TEXT NOT NULL,
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model TEXT NOT NULL,
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serial_number TEXT UNIQUE NOT NULL,
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status TEXT DEFAULT 'available'
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)
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''')
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cursor.execute('''
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CREATE TABLE IF NOT EXISTS users (
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id INTEGER PRIMARY KEY AUTOINCREMENT,
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name TEXT NOT NULL,
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identification TEXT UNIQUE
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)
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''')
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cursor.execute('''
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CREATE TABLE IF NOT EXISTS loans (
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id INTEGER PRIMARY KEY AUTOINCREMENT,
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tablet_id INTEGER NOT NULL,
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user_id INTEGER NOT NULL,
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loan_date TEXT NOT NULL,
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return_date TEXT,
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status TEXT DEFAULT 'active',
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FOREIGN KEY (tablet_id) REFERENCES tablets (id),
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FOREIGN KEY (user_id) REFERENCES users (id)
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)
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''')
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conn.commit()
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conn.close()
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def add_tablet(brand, model, serial_number):
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"""Add a new tablet to inventory"""
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conn = sqlite3.connect('tablets.db')
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cursor = conn.cursor()
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try:
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cursor.execute('''
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INSERT INTO tablets (brand, model, serial_number, status)
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VALUES (?, ?, ?, 'available')
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''', (brand, model, serial_number))
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conn.commit()
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print(f"✓ Added tablet: {brand} {model} ({serial_number})")
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except sqlite3.IntegrityError:
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print(f"✗ Error: Serial number {serial_number} already exists")
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finally:
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conn.close()
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def add_user(name, identification):
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"""Add a new user"""
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conn = sqlite3.connect('tablets.db')
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cursor = conn.cursor()
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try:
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cursor.execute('''
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INSERT INTO users (name, identification)
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VALUES (?, ?)
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''', (name, identification))
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conn.commit()
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print(f"✓ Added user: {name} ({identification})")
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except sqlite3.IntegrityError:
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print(f"✗ Error: Identification {identification} already exists")
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finally:
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conn.close()
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def loan_tablet(tablet_id, user_id):
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"""Loan a tablet to a user"""
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conn = sqlite3.connect('tablets.db')
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cursor = conn.cursor()
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# Check if tablet is available
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cursor.execute("SELECT status FROM tablets WHERE id = ?", (tablet_id,))
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result = cursor.fetchone()
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if result and result[0] == 'available':
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# Update tablet status
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cursor.execute("UPDATE tablets SET status = 'loaned' WHERE id = ?", (tablet_id,))
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# Create loan record
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loan_date = datetime.now().strftime('%Y-%m-%d %H:%M:%S')
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cursor.execute('''
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INSERT INTO loans (tablet_id, user_id, loan_date, status)
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VALUES (?, ?, ?, 'active')
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''', (tablet_id, user_id, loan_date))
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conn.commit()
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print(f"✓ Tablet {tablet_id} loaned to user {user_id}")
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else:
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print(f"✗ Error: Tablet {tablet_id} is not available for loan")
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conn.close()
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def return_tablet(loan_id):
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"""Return a loaned tablet"""
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conn = sqlite3.connect('tablets.db')
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cursor = conn.cursor()
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# Get loan information
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cursor.execute("SELECT tablet_id FROM loans WHERE id = ? AND status = 'active'", (loan_id,))
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loan = cursor.fetchone()
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if loan:
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tablet_id = loan[0]
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# Update loan status and return date
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return_date = datetime.now().strftime('%Y-%m-%d %H:%M:%S')
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cursor.execute('''
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UPDATE loans SET status = 'returned', return_date = ? WHERE id = ?
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''', (return_date, loan_id))
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# Update tablet status
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cursor.execute("UPDATE tablets SET status = 'available' WHERE id = ?", (tablet_id,))
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conn.commit()
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print(f"✓ Tablet returned for loan {loan_id}")
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else:
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print(f"✗ Error: Loan {loan_id} not found or already returned")
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conn.close()
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def show_available_tablets():
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"""Show available tablets"""
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conn = sqlite3.connect('tablets.db')
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cursor = conn.cursor()
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cursor.execute("SELECT id, brand, model, serial_number FROM tablets WHERE status = 'available'")
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tablets = cursor.fetchall()
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print("\n=== Available Tablets ===")
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if tablets:
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for tablet in tablets:
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print(f"ID: {tablet[0]}, {tablet[1]} {tablet[2]} ({tablet[3]})")
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else:
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print("No available tablets")
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conn.close()
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def show_active_loans():
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"""Show active loans"""
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conn = sqlite3.connect('tablets.db')
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cursor = conn.cursor()
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cursor.execute('''
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SELECT l.id, t.brand, t.model, t.serial_number, u.name, l.loan_date
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FROM loans l
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JOIN tablets t ON l.tablet_id = t.id
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JOIN users u ON l.user_id = u.id
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WHERE l.status = 'active'
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''')
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loans = cursor.fetchall()
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print("\n=== Active Loans ===")
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if loans:
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for loan in loans:
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print(f"Loan ID: {loan[0]}, Tablet: {loan[1]} {loan[2]} ({loan[3]}), Borrower: {loan[4]}, Loan Date: {loan[5]}")
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else:
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print("No active loans")
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conn.close()
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def show_loan_history():
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"""Show complete loan history"""
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conn = sqlite3.connect('tablets.db')
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cursor = conn.cursor()
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cursor.execute('''
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SELECT l.id, t.brand, t.model, t.serial_number, u.name,
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l.loan_date, l.return_date, l.status
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FROM loans l
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JOIN tablets t ON l.tablet_id = t.id
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JOIN users u ON l.user_id = u.id
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ORDER BY l.loan_date DESC
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''')
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loans = cursor.fetchall()
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print("\n=== Loan History ===")
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if loans:
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for loan in loans:
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return_date = loan[6] or 'Not returned'
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print(f"Loan ID: {loan[0]}, Tablet: {loan[1]} {loan[2]} ({loan[3]}), Borrower: {loan[4]}")
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print(f" Loan Date: {loan[5]}, Return Date: {return_date}, Status: {loan[7]}")
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else:
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print("No loan history")
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conn.close()
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def main():
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"""Main menu"""
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init_db()
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print("=== Tablet Lending and Return Management System ===")
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print("Using SQLite database: tablets.db")
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while True:
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print("\nMenu:")
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print("1. Add Tablet")
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print("2. Add User")
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print("3. Loan Tablet")
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print("4. Return Tablet")
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print("5. Show Available Tablets")
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print("6. Show Active Loans")
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print("7. Show Loan History")
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print("8. Exit")
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choice = input("Enter your choice (1-8): ")
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if choice == '1':
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print("\n=== Add Tablet ===")
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brand = input("Brand: ")
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model = input("Model: ")
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serial_number = input("Serial Number: ")
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add_tablet(brand, model, serial_number)
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elif choice == '2':
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print("\n=== Add User ===")
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name = input("Name: ")
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identification = input("Identification: ")
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add_user(name, identification)
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elif choice == '3':
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print("\n=== Loan Tablet ===")
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show_available_tablets()
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show_users()
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tablet_id = input("Enter Tablet ID to loan: ")
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user_id = input("Enter User ID: ")
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try:
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loan_tablet(int(tablet_id), int(user_id))
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except ValueError:
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print("✗ Error: Invalid ID format")
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elif choice == '4':
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print("\n=== Return Tablet ===")
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show_active_loans()
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loan_id = input("Enter Loan ID to return: ")
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try:
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return_tablet(int(loan_id))
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except ValueError:
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print("✗ Error: Invalid Loan ID format")
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elif choice == '5':
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show_available_tablets()
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elif choice == '6':
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show_active_loans()
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elif choice == '7':
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show_loan_history()
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elif choice == '8':
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print("Goodbye!")
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break
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else:
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print("✗ Invalid choice. Please try again.")
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def show_users():
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"""Show available users"""
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conn = sqlite3.connect('tablets.db')
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cursor = conn.cursor()
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cursor.execute("SELECT id, name, identification FROM users")
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users = cursor.fetchall()
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print("\n=== Available Users ===")
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if users:
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for user in users:
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print(f"ID: {user[0]}, {user[1]} ({user[2]})")
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else:
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print("No users available")
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conn.close()
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if __name__ == '__main__':
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main()
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