SQL-Database in C++

Author: Samuel Mekonnen

🗂 Project Overview

This is a lightweight SQL-like database engine implemented in C++. It features a command-line interface, custom tokenizer, parser, and binary file-backed table storage. It supports simple SQL commands including SELECT, INSERT, and conditional queries using a custom-built relational engine.

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✅ Features

• Interactive SQL command line interface
• Batch command execution via commands.txt
• Binary file-based table storage (e.g., student.bin, employee.bin)
• Tokenizer and parser with support for basic SQL syntax
• Shunting Yard and Reverse Polish Notation (RPN) evaluation
• Error handling with specific messages
• Modular design using STL and custom components
• Unit tests using GoogleTest

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📁 File Structure

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├── CMakeLists.txt           # Build configuration
├── main.cpp                 # Entry point: handles CLI and batch execution
├── commands.txt             # Batch SQL commands
├── tables.txt               # Table index/config
├── includes/                # All logic: tokenizer, parser, sql engine
├── _tests/                  # Unit test files using GoogleTest
├── *.bin                    # Binary table storage files
└── *.txt                    # Table field descriptions and selected outputs