Java Query Language

This project is a mini relational database engine built in Java, using string processing and regex.

Main Features

• Table creation and deletion
• Row insertion, update, and deletion
• Filtering with custom expressions (e.g., grade > 15)
• Support for basic data types: int, str, dbl, time
• Grouping and counting based on field combinations
• Custom field selection and arithmetic operations in queries
• Interactive command-line interface
• Graceful error handling with meaningful messages

Example Commands:

create students[id int, name str, grade dbl, approved int]
add students{id=40211343, name='mani'}
get students(grade > 15.0)
set students(id=40210000){approved=1}
del students(name='mani', grade=18.5)   

Full Project Specification

For the full project instructions (in Persian), please refer to the link in the Website section of this repository's About panel (top-right).