Convert sqlite.py to Idempotent DB Setup Script

[princexpoddar]

Fixes #2

Summary

Transformed the basic SQLite script into a robust, idempotent database setup utility with CLI interface and comprehensive error handling.

Key Changes

✅ Idempotent Execution

• Wrapped execution in if __name__ == "__main__" block
• Added CREATE TABLE IF NOT EXISTS to prevent table creation errors
• Implemented INSERT OR IGNORE with unique constraints to prevent duplicate records

✅ CLI Interface

• Added argparse for command-line argument handling
• --db-path: Specify custom database file path (default: student.db)
• --mode: Choose between append (default) or recreate modes
• --no-display: Skip record display after setup

✅ Data Integrity

• Added unique constraint on (NAME, CLASS, SECTION) to prevent duplicates
• Implemented auto-increment ID as primary key
• Used parameterized queries to prevent SQL injection

✅ Error Handling & Robustness

• Comprehensive try-catch blocks with proper rollback on errors
• Type hints for better code maintainability
• Windows-compatible output (fixed Unicode character issues)

✅ Testing Verified

• Script runs multiple times without errors or duplicates
• Both append and recreate modes work correctly
• All CLI flags function as expected

Usage Examples

# Basic usage (append mode)
py sqlite.py

# Recreate mode (clears existing data)
py sqlite.py --mode recreate

# Custom database path
py sqlite.py --db-path my_database.db

# Skip displaying records
py sqlite.py --no-display

# Show help
py sqlite.py --help

Benefits

• Safe to run multiple times without side effects
• Flexible CLI interface for different use cases
• Production-ready error handling and logging
• Maintains backward compatibility with existing data

Files Changed

• sqlite.py - Complete refactor with idempotent functionality

Testing

• ✅ No linter errors
• ✅ Idempotent execution verified
• ✅ CLI flags tested
• ✅ Error handling validated
• ✅ Data integrity confirmed

Before vs After

Before

# Basic script that would fail on multiple runs
connection = sqlite3.connect("student.db")
cursor = connection.cursor()
cursor.execute("create table STUDENT(...)")
cursor.execute("Insert Into STUDENT values(...)")

After

# Idempotent script with CLI interface
if __name__ == "__main__":
    main()

def main():
    parser = argparse.ArgumentParser(...)
    # Robust error handling and idempotent operations

[Neha20072002]

@princexpoddar link your PR to concerned issue

[princexpoddar]

@Neha20072002 I have resolved the issue..kindly see

[Neha20072002]

Accepted