🚀 Loved this tutorial? Subscribe to Ram N Java for more easy-to-follow coding guides! 🌟
Understanding Layered Architecture in Spring Boot
In this tutorial, we dive into how to retrieve employee records from a database using Spring Boot and JdbcTemplate. The key to building professional applications is a "Layered Architecture," which keeps your code clean and organized. We break it down into three simple parts:
- Controller Layer: This is the entry point that handles incoming requests (like from Postman).
- Service Layer: This is where the business logic lives, acting as a bridge between the controller and the data.
- Repository Layer: This layer talks directly to your database (MySQL) to fetch the actual data.
Step-by-Step Implementation
1. Configuration & Database
We start by setting up our application.properties with the database URL, username, and password. This allows Spring Boot to establish a connection to your MySQL server automatically.
2. The Employee Model
We create a simple Java class called Employee with properties like ID, Name, Age, and Salary. We include getters, setters, and a toString method to make the data easy to work with.
3. Using JdbcTemplate & RowMapper
The JdbcTemplate is a powerful tool that simplifies database operations. We use the queryForObject method to execute a SQL SELECT statement. To map the database rows to our Java Employee object, we implement the RowMapper interface.
4. Testing with Postman
Once the layers are connected, we run the Spring Boot application and use Postman to send a GET request. You'll see the flow of data from the Controller, through the Service, into the Repository, and finally back to you as a clean JSON response!
Watch More Tutorials
Check out these other helpful videos from my channel:
No comments:
Post a Comment