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Build CRUD REST API's using Spring Boot, Spring Data JPA and MySQL Database

Pragya Keshap answered on February 10, 2023 Popularity 9/10 Helpfulness 2/10

answer Build CRUD REST API's using Spring Boot, Spring Data JPA and MySQL Database

Build CRUD REST API's using Spring Boot, Spring Data JPA and MySQL Database

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spring.datasource.username & spring.datasource.password properties are the same as your database installation.

Spring Boot uses Hibernate for JPA implementation, we configure MySQL5InnoDBDialect for MySQL or PostgreSQLDialect for PostgreSQL

spring.jpa.hibernate.ddl-auto is used for database initialization. We set the value to update value so that a table will be created in the database automatically corresponding to defined data model. Any change to the model will also trigger an update to the table. For production, this property should be validate

@CrossOrigin(origins = "http://localhost:8081")
@RestController
@RequestMapping("/api")
public class TutorialController {

  @Autowired
  TutorialRepository tutorialRepository;

  @GetMapping("/tutorials")
  public ResponseEntity<List<Tutorial>> getAllTutorials(@RequestParam(required = false) String title) {
    try {
      List<Tutorial> tutorials = new ArrayList<Tutorial>();

      if (title == null)
        tutorialRepository.findAll().forEach(tutorials::add);
      else
        tutorialRepository.findByTitleContaining(title).forEach(tutorials::add);

      if (tutorials.isEmpty()) {
        return new ResponseEntity<>(HttpStatus.NO_CONTENT);
      }

      return new ResponseEntity<>(tutorials, HttpStatus.OK);
    } catch (Exception e) {
      return new ResponseEntity<>(null, HttpStatus.INTERNAL_SERVER_ERROR);
    }
  }

  @GetMapping("/tutorials/{id}")
  public ResponseEntity<Tutorial> getTutorialById(@PathVariable("id") long id) {
    Optional<Tutorial> tutorialData = tutorialRepository.findById(id);

    if (tutorialData.isPresent()) {
      return new ResponseEntity<>(tutorialData.get(), HttpStatus.OK);
    } else {
      return new ResponseEntity<>(HttpStatus.NOT_FOUND);
    }
  }

  @PostMapping("/tutorials")
  public ResponseEntity<Tutorial> createTutorial(@RequestBody Tutorial tutorial) {
    try {
      Tutorial _tutorial = tutorialRepository
          .save(new Tutorial(tutorial.getTitle(), tutorial.getDescription(), false));
      return new ResponseEntity<>(_tutorial, HttpStatus.CREATED);
    } catch (Exception e) {
      return new ResponseEntity<>(null, HttpStatus.INTERNAL_SERVER_ERROR);
    }
  }

  @PutMapping("/tutorials/{id}")
  public ResponseEntity<Tutorial> updateTutorial(@PathVariable("id") long id, @RequestBody Tutorial tutorial) {
    Optional<Tutorial> tutorialData = tutorialRepository.findById(id);

    if (tutorialData.isPresent()) {
      Tutorial _tutorial = tutorialData.get();
      _tutorial.setTitle(tutorial.getTitle());
      _tutorial.setDescription(tutorial.getDescription());
      _tutorial.setPublished(tutorial.isPublished());
      return new ResponseEntity<>(tutorialRepository.save(_tutorial), HttpStatus.OK);
    } else {
      return new ResponseEntity<>(HttpStatus.NOT_FOUND);
    }
  }

  @DeleteMapping("/tutorials/{id}")
  public ResponseEntity<HttpStatus> deleteTutorial(@PathVariable("id") long id) {
    try {
      tutorialRepository.deleteById(id);
      return new ResponseEntity<>(HttpStatus.NO_CONTENT);
    } catch (Exception e) {
      return new ResponseEntity<>(HttpStatus.INTERNAL_SERVER_ERROR);
    }
  }

  @DeleteMapping("/tutorials")
  public ResponseEntity<HttpStatus> deleteAllTutorials() {
    try {
      tutorialRepository.deleteAll();
      return new ResponseEntity<>(HttpStatus.NO_CONTENT);
    } catch (Exception e) {
      return new ResponseEntity<>(HttpStatus.INTERNAL_SERVER_ERROR);
    }

  }

  @GetMapping("/tutorials/published")
  public ResponseEntity<List<Tutorial>> findByPublished() {
    try {
      List<Tutorial> tutorials = tutorialRepository.findByPublished(true);

      if (tutorials.isEmpty()) {
        return new ResponseEntity<>(HttpStatus.NO_CONTENT);
      }
      return new ResponseEntity<>(tutorials, HttpStatus.OK);
    } catch (Exception e) {
      return new ResponseEntity<>(HttpStatus.INTERNAL_SERVER_ERROR);
    }
  }

}

https://www.bezkoder.com/spring-boot-jpa-crud-rest-api/

Popularity 9/10 Helpfulness 2/10 Language java

Source: Grepper

Tags: build crud database java mysql rest spring-data-jpa using

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Contributed on Feb 10 2023

Pragya Keshap

0 Answers Avg Quality 2/10

Build CRUD REST API's using Spring Boot, Spring Data JPA and MySQL Database

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