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Updating Data with Spring Boot & JdbcTemplate
In our previous tutorials, we learned how to retrieve data. Today, we're taking it a step further by learning how to Update records in a MySQL database using Spring Boot and JdbcTemplate. We will continue following the professional Layered Architecture to ensure our code is scalable and easy to maintain.
The Core Concept: Layered Architecture
To keep things simple for beginners, remember that every request flows through these sections:
- Controller: Handles the web request (the "brain" that receives instructions).
- Service: Handles the business logic (the "logic" that decides what to do).
- Repository: Handles the database communication (the "muscles" that do the heavy lifting).
Step-by-Step Implementation
1. Creating the Update Repository Method
In the Repository layer, we use the jdbcTemplate.update() method. This method is used for all "Data Manipulation Language" (DML) operations like INSERT, UPDATE, and DELETE. We write a standard SQL query: UPDATE employee SET name = ?, age = ? WHERE id = ?.
2. Connecting via the Service Layer
The Service layer acts as the middleman. It receives the updated data from the controller and passes it down to the repository. This is where you would typically add any validation or extra logic before saving the data.
3. Exposing the PUT Endpoint
In the Controller, we use the @PutMapping annotation. This tells Spring Boot that this method should handle HTTP PUT requests, which are standard for updating existing resources.
4. Testing with Postman
Once everything is coded, we jump into Postman. We send a JSON body with the new details for an existing employee ID. If everything is correct, the database updates instantly, and we receive a success confirmation!
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