Building a Hotel Management System with PostgreSQL and Spring Boot

Creating a Hotel Management System requires proper planning and integration of backend technologies. This guide takes you through every step: setting up PostgreSQL, configuring Spring Boot, defining entities, implementing APIs, and testing.

Step 1: Install and Set Up PostgreSQL

PostgreSQL is the database engine for our project. Let’s set it up before moving to the Spring Boot application.

Step 2: Setting Up PostgreSQL

After installing PostgreSQL, we need to configure the database for the Hotel Management System. Follow these steps to set up the database and user.

Step 3: Configuring Spring Boot to Connect to PostgreSQL

Now that we have set up PostgreSQL, we need to configure our Spring Boot application to connect to the database. Here’s how you can do it:

1. Add PostgreSQL Dependency in pom.xml

Open your pom.xml file and add the following dependencies for PostgreSQL:

• spring-boot-starter-data-jpa: This dependency is required to work with Spring Data JPA for interacting with the database.

• postgresql: This is the PostgreSQL JDBC driver that allows Spring Boot to connect to the PostgreSQL database.

Here's how your pom.xml should look:

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
    <groupId>org.postgresql</groupId>
    <artifactId>postgresql</artifactId>
</dependency>

2. Configure Database Connection in application.properties

In the src/main/resources directory, open the application.properties file and add the PostgreSQL connection details.

Add the following configuration:

spring.datasource.url=jdbc:postgresql://localhost:5432/hotel_management_db
spring.datasource.username=hotel_admin
spring.datasource.password=your_password
spring.jpa.hibernate.ddl-auto=update
spring.jpa.database-platform=org.hibernate.dialect.PostgreSQLDialect

3. Create JPA Entity Classes

So let's first create an ER diagram with the relationships.

In this step, we will create the necessary entity classes that will represent our tables in the PostgreSQL database. Below is a list of the main entities that need to be created for the Hotel Management System:

• RoomType: Represents the different types of rooms available in the hotel.
• BookingDetails: Contains information about a customer's booking, such as check-in/check-out dates, customer details, and assigned room.
• HouseKeeping: Tracks housekeeping tasks performed in rooms (e.g., cleaning, maintenance).
• Cancellation: Stores details of any cancellations, including refund amounts and cancellation dates.

Once the entities are created, we will proceed with defining the corresponding services to handle the business logic for these entities.

4. Create Service Classes

Next, we will create service classes that contain the business logic for each of the entities. These services will interact with the repository layer and perform operations like adding, updating, retrieving, and deleting data.

• RoomTypeService: Manages operations related to room types.
• BookingDetailsService: Handles booking details, including creating and updating bookings.
• HouseKeepingService: Manages housekeeping tasks like adding new tasks and viewing existing ones.
• CancellationService: Deals with the logic of booking cancellations and refunds.

5. Create Controller Classes

We will then create the controller classes that will handle the API endpoints and map the HTTP requests to the appropriate service methods.

• RoomTypeController: Manages the endpoints for adding, updating, and fetching room types.
• BookingDetailsController: Handles endpoints related to booking details, including viewing and updating bookings.
• HouseKeepingController: Manages housekeeping task-related endpoints.
• CancellationController: Handles cancellation-related endpoints.

6. API Endpoints

Finally, the following API endpoints will be created for each controller to perform CRUD operations:

• RoomTypeController:
  • POST /api/room-types: Add a new room type.
  • GET /api/room-types: Get a list of all room types.
  • GET /api/room-types/{id}: Get details of a specific room type by ID.
• BookingDetailsController:
  • POST /api/bookings: Create a new booking.
  • GET /api/bookings: Get a list of all bookings.
  • GET /api/bookings/{id}: Get details of a specific booking by ID.
• HouseKeepingController:
  • POST /api/housekeeping-tasks: Add a new housekeeping task.
  • GET /api/housekeeping-tasks: Get a list of all housekeeping tasks.
  • GET /api/housekeeping-tasks/{id}: Get details of a specific housekeeping task by ID.
• CancellationController:
  • POST /api/cancellations: Add a new cancellation.
  • GET /api/cancellations: Get a list of all cancellations.
  • GET /api/cancellations/{id}: Get details of a specific cancellation by ID.

These controllers will be responsible for managing requests and responses, and they will interact with the service layer to implement the core business logic of the Hotel Management System.

Conclusion

By following these steps, we have successfully set up a Hotel Management System with PostgreSQL and Spring Boot. This system allows us to manage room types, bookings, housekeeping tasks, and cancellations, with a robust backend structure to support API endpoints.

I have the full code and APIs available on Postman for easy access. If you'd like to explore the full implementation, feel free to reach out to me through the following:

• LinkedIn: https://www.linkedin.com/in/siddharthmehta121212
• GitHub: https://github.com/sid121212
• Email: siddharthmehta121212@gmail.com

Thank you for reading, and happy coding!