How to Create Todo List API using Spring Boot and MySQL?

Creating a Todo List API using Spring Boot and MySQL involves several steps. Below is a condensed walkthrough:

Prerequisites:

IntelliJ IDEA (or any IDE of your choice)
Java Development Kit (JDK)
MySQL Server running locally (or a remote connection)
Maven or Gradle (for dependency management)

Step-by-Step Guide:

1. Create a New Spring Boot Project

Using IntelliJ IDEA or Spring Initializr, create a new Spring Boot project. Add these dependencies: Spring Web, Spring Data JPA, and MySQL Driver.

2. Configure the Database Connection

In src/main/resources/application.properties, add the following:

spring.datasource.url=jdbc:mysql://localhost:3306/tododb?useSSL=false&serverTimezone=UTC
spring.datasource.username=YOUR_DB_USERNAME
spring.datasource.password=YOUR_DB_PASSWORD
spring.jpa.hibernate.ddl-auto=update

Replace YOUR_DB_USERNAME and YOUR_DB_PASSWORD with your MySQL credentials.

3. Create the Todo Entity

@Entity
public class Todo {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    private String title;

    private Boolean completed = false;

    // Constructors, getters, setters
}

4. Create the Repository Interface

@Repository
public interface TodoRepository extends JpaRepository<Todo, Long> {
}

5. Create the Service

@Service
public class TodoService {

    @Autowired
    private TodoRepository todoRepository;

    public List<Todo> findAll() {
        return todoRepository.findAll();
    }

    public Todo findById(Long id) {
        return todoRepository.findById(id).orElse(null);
    }

    public Todo save(Todo todo) {
        return todoRepository.save(todo);
    }

    public void deleteById(Long id) {
        todoRepository.deleteById(id);
    }
}

6. Create the API Controller

@RestController
@RequestMapping("/api/todos")
public class TodoController {

    @Autowired
    private TodoService todoService;

    @GetMapping
    public List<Todo> getAllTodos() {
        return todoService.findAll();
    }

    @GetMapping("/{id}")
    public Todo getTodoById(@PathVariable Long id) {
        return todoService.findById(id);
    }

    @PostMapping
    public Todo createTodo(@RequestBody Todo todo) {
        return todoService.save(todo);
    }

    @PutMapping("/{id}")
    public Todo updateTodo(@PathVariable Long id, @RequestBody Todo todo) {
        Todo existingTodo = todoService.findById(id);
        BeanUtils.copyProperties(todo, existingTodo, "id");
        return todoService.save(existingTodo);
    }

    @DeleteMapping("/{id}")
    public void deleteTodo(@PathVariable Long id) {
        todoService.deleteById(id);
    }
}

7. Run the Application

Run the application from your IDE or command line (mvn spring-boot:run for Maven). This will start the Spring Boot server, and the application will connect to the database, creating the todos table based on the Todo entity.

You now have a basic Todo List API! Use tools like Postman or CURL to interact with your API. Remember, this is a basic guide, and in a production application, you'd need to add more features like error handling, security, validation, etc.

Creating RESTful endpoints for a Todo List application in Spring Boot:

Description: Design and implement RESTful endpoints for Todo List operations.

Java Code:

@RestController
@RequestMapping("/api/todos")
public class TodoController {

    @Autowired
    private TodoService todoService;

    @GetMapping
    public List<Todo> getAllTodos() {
        return todoService.getAllTodos();
    }

    // Implement other CRUD operations
}

Configuring Spring Boot for MySQL database integration:

Description: Set up Spring Boot to connect to a MySQL database.

Properties (application.properties):

spring.datasource.url=jdbc:mysql://localhost:3306/todo_db
spring.datasource.username=root
spring.datasource.password=your_password
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver

Implementing CRUD operations for Todo items with Spring Boot:

Description: Create service methods for CRUD operations on Todo items.

Java Code:

@Service
public class TodoService {

    @Autowired
    private TodoRepository todoRepository;

    public List<Todo> getAllTodos() {
        return todoRepository.findAll();
    }

    // Implement other CRUD methods
}

Handling task prioritization and categories in a Spring Boot Todo List API:
- Description: Add fields for task prioritization and categories in the Todo entity.
- Entity (Todo.java):
```
// Add fields like priority and category
```
Securing a Todo List API with Spring Boot security features:
- Description: Add security features to protect Todo List endpoints.
- Java Code (SecurityConfig.java):
```
// Configure security settings
```
Enabling pagination and sorting in the Todo List API with Spring Boot:
- Description: Implement pagination and sorting for the Todo List API.
- Java Code:
```
// Implement pagination and sorting in controller methods
```
Handling user authentication and authorization in Spring Boot:
- Description: Implement user authentication and authorization for secure operations.
- Java Code:
```
// Implement authentication and authorization logic
```
Configuring validation and error handling in the API:
- Description: Implement validation for request payloads and handle errors gracefully.
- Java Code:
```
// Implement validation annotations and exception handlers
```
Implementing search functionality in a Spring Boot Todo List API:
- Description: Allow users to search for Todo items based on specific criteria.
- Java Code:
```
// Implement search methods in the controller
```
Using Spring Data JPA for database interactions in Todo List application:
- Description: Leverage Spring Data JPA for simplified database interactions.
- Repository (TodoRepository.java):
```
// Extend JpaRepository for basic CRUD operations
```
Handling asynchronous operations in a Spring Boot Todo List API:
- Description: Implement asynchronous operations for improved performance.
- Java Code:
```
// Use @Async or CompletableFuture for asynchronous tasks
```