Step1:
Set up a spring boot, H2 project. Include lombok dependency as well
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>Step2:
- Enable the H2 in the application.properties file
- Prepare data.sql with student records for seeding the h2 DB
Step3:
- Student Entity
@Data
@AllArgsConstructor
@NoArgsConstructor
@Entity
public class Student {
@Id
@GeneratedValue
private Long id;
private String name;
private String course;
private int admissionYear;
}- Repository
public interface StudentRepository extends JpaRepository<Student, Long> {
@Query("select s from Student s where name like %?1%")
Page<Student> findByName(String name, Pageable pageable);
}- Service
@Service
@RequiredArgsConstructor
public class StudentService {
@Autowired
private StudentRepository studentRepository;
public Page<Student> findByName(
Optional<String> name,
Optional<Integer> page,
Optional<String> sortBy) {
return studentRepository.findByName(name.orElse("_"),
PageRequest.of(
page.orElse(0), 5,
Sort.Direction.ASC, sortBy.orElse("id")));
}
}- Controller
@RestController
@RequiredArgsConstructor
public class StudentController {
@Autowired
private final StudentService studentService;
@GetMapping("/students")
public Page<Student> findByName(
@RequestParam Optional<String> name,
@RequestParam Optional<Integer> page,
@RequestParam Optional<String> sortBy)
{
return studentService.findByName(name,page,sortBy);
}
}Step4:
Run the spring boot application and verify the output
http://localhost:8080/students?name=john
http://localhost:8080/students?page=0
http://localhost:8080/students?page=0&sortBy=name
Happy Coding