Biblioteca Genero

package com.trifulcas.SpringBootBiblioteca.model;

import jakarta.persistence.Entity;
import jakarta.persistence.GeneratedValue;
import jakarta.persistence.GenerationType;
import jakarta.persistence.Id;
import jakarta.persistence.Table;

@Entity
@Table(name = "genero")
public class Genero {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private int idgenero;

    private String nombre;

    // Constructor vacío
    public Genero() {
    }

    // Constructor con parámetros
    public Genero(String nombre) {
        this.nombre = nombre;
    }

    // Getters y Setters
    public int getIdgenero() {
        return idgenero;
    }

    public void setIdgenero(int idgenero) {
        this.idgenero = idgenero;
    }

    public String getNombre() {
        return nombre;
    }

    public void setNombre(String nombre) {
        this.nombre = nombre;
    }

    // Método toString (opcional)
    @Override
    public String toString() {
        return "Genero{" +
                "idgenero=" + idgenero +
                ", nombre='" + nombre + '\'' +
                '}';
    }
}

package com.trifulcas.SpringBootBiblioteca.repository;

import org.springframework.data.jpa.repository.JpaRepository;

import com.trifulcas.SpringBootBiblioteca.model.Genero;

public interface GeneroRepository extends JpaRepository<Genero, Integer> {

}

package com.trifulcas.SpringBootBiblioteca.controller;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.DeleteMapping;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.PutMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import com.trifulcas.SpringBootBiblioteca.model.Genero;
import com.trifulcas.SpringBootBiblioteca.repository.GeneroRepository;

@RestController
@RequestMapping("/genero")
public class GeneroController {

	@Autowired
	GeneroRepository generoRepository;

	@GetMapping("")
	public List<Genero> getAll() {
		try {
			return generoRepository.findAll();
		} catch (Exception ex) {
			System.out.println(ex.getMessage());
			return null;
		}
	}

	// Poner los valores en la URL, no parámetros nombrados
	@GetMapping("/{id}")
	public ResponseEntity<Genero> getById(@PathVariable int id) {
		System.out.println(id);

		try {
			Genero cat= generoRepository.findById(id).orElse(null);
			if (cat!=null) {
				return new ResponseEntity<>(cat, HttpStatus.OK);
			}
			else {
				return new ResponseEntity<>(HttpStatus.NOT_FOUND);
			}
		} catch (Exception ex) {
			System.out.println(ex.getMessage());
			return null;
		}
	}

	@PostMapping("")
	public Genero add(@RequestBody Genero cat) {
		System.out.println(cat);
		try {
			if (cat.getIdgenero() == 0 && cat.getNombre() != null) {
				return generoRepository.save(cat);
			} else {
				return null;
			}
		} catch (Exception ex) {
			System.out.println(ex.getMessage());
			return null;
		}
	}

	@PutMapping("/{id}")
	public Genero put(@RequestBody Genero cat, @PathVariable int id) {
		System.out.println(cat);
		System.out.println(id);
		try {
			if (cat.getIdgenero() == id) {
				return generoRepository.save(cat);
			} else {
				return null;
			}

		} catch (Exception ex) {
			System.out.println(ex.getMessage());
			return null;
		}
	}

	@DeleteMapping("/{id}")
	public int delete(@PathVariable int id) {
		try {
			System.out.println(id);
			generoRepository.deleteById(id);
			return id;
		} catch (Exception ex) {
			System.out.println(ex.getMessage());
			return 0;
		}
	}
}