https://github.com/nickklos10/sql-client-app

Two-tier Java client-server application that uses JDBC to connect multiple client users with different permissions to a MySQL database.
https://github.com/nickklos10/sql-client-app

database-management java jdbc mysql oop sql

Last synced: 2 months ago
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Two-tier Java client-server application that uses JDBC to connect multiple client users with different permissions to a MySQL database.

• Host: GitHub
• URL: https://github.com/nickklos10/sql-client-app
• Owner: nickklos10
• Created: 2024-10-17T01:33:56.000Z (7 months ago)
• Default Branch: main
• Last Pushed: 2024-11-04T00:43:34.000Z (7 months ago)
• Last Synced: 2025-01-18T02:27:55.846Z (4 months ago)
• Topics: database-management, java, jdbc, mysql, oop, sql
• Language: Java
• Homepage:
• Size: 33.2 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# A Two-Tier Client-Server Application Using MySQL and JDBC

## Overview

This project is designed to create two Java-based GUI applications that interact with a MySQL database via JDBC, focusing on client-server interactions. The first application allows clients to execute SQL commands, while the second is a specialized accountant-level client for querying transaction logs.

## Table of Contents

1. [Objectives](#objectives)

2. [Technologies Used](#technologies-used)

3. [Features](#features)

4. [User Instructions](#user-instructions)

5. [Application Design](#application-design)

    - [Main Client Application](#main-client-application)

    - [Accountant Application](#accountant-application)

6. [Database Setup](#database-setup)

---

## Objectives

The project focuses on developing two-tier Java client-server applications that connect to a MySQL database using JDBC. It emphasizes learning how JDBC handles SQL operations and ensuring that multiple clients with different permissions can interact with a MySQL DB server simultaneously.

## Technologies Used

- **Java**: GUI development (Swing)

- **MySQL**: Database server

- **JDBC**: Database connectivity

- **Properties Files**: Store user credentials and database connection information

- **Git**: Version control

- **NetBeans or IntelliJ IDEA**: IDEs for development

## Features

1. **Multiple Clients**: The application allows multiple client users with different levels of permissions to connect to the MySQL server.

2. **SQL Execution**: Users can execute SQL DML and DDL commands from the GUI (select, insert, update, delete).

3. **Prepared Statements**: The project uses JDBC’s PreparedStatement interface for issuing SQL commands securely.

4. **Transaction Logging**: All SQL operations are logged into a separate `operationslog` database.

5. **Accountant Client**: A specialized GUI for accountant-level users to view transaction logs.

6. **Error Handling**: Users are notified of any SQL execution errors, and invalid credentials prevent connections to the database.

---

## User Instructions

1. **Setting Up the Application**:

   - Download the source code.

   - Use the provided scripts to set up the MySQL databases (`project3` and `operationslog`).

   - Create and configure user accounts in MySQL (root, client1, client2, project3app, theaccountant).

   

2. **Running the Client Application**:

   - Open the `MainClientApplication.java` file and run the application.

   - Enter the appropriate username and password from the GUI.

   - Select a database, enter an SQL command, and press "Execute."

   - The results or status will be displayed in the result area.

3. **Running the Accountant Application**:

   - Open the `AccountantApplication.java` file and run the application.

   - Enter the `theaccountant` credentials, connect to the `operationslog` database, and run queries related to transaction logging.

---

## Application Design

### Main Client Application

- **File**: `MainClientApplication.java`

- **Purpose**: General clients use this application to issue SQL commands on the `project3` and `bikedb` databases.

- **Functionality**:

  - GUI interface for selecting a properties file to establish database connections.

  - Executes SQL queries and displays results.

  - Logs all transactions (successful queries and updates) into the `operationslog` database.

  

### Accountant Application

- **File**: `AccountantApplication.java`

- **Purpose**: This application is specialized for an accountant-level user to monitor transaction logs in the `operationslog` database.

- **Functionality**:

  - Allows querying of the transaction logging database.

  - Does not permit modification or access to other databases.

  

---

## Database Setup

1. **Create Databases**:

   - Run the `project3dbscript.sql` to create the `project3` database.

   - Run the `project3operationslog.sql` to create the `operationslog` database.

2. **Create Client Users**:

   - Execute the `clientCreationScriptProject3.sql` script to create the following MySQL users: `client1`, `client2`, `project3app`, and `theaccountant`.

   

3. **Assign Permissions**:

   - Use the `clientPermissionsScriptProject3.sql` to grant each client specific permissions to interact with the databases:

     - `client1`: Select permissions on `project3` and `bikedb`.

     - `client2`: Select and update permissions on `project3` and `bikedb`.

     - `project3app`: Select, insert, update on `operationslog`.

     - `theaccountant`: Select on `operationslog`.

## Conclusion

This project demonstrates the development of a two-tier Java client-server system using MySQL and JDBC, with multiple client permissions, transaction logging, and a specialized monitoring application for accountant-level users. Follow the setup instructions and ensure that MySQL is configured properly to run the applications successfully.