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MaiklinsMaiklins
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Merge pull request #17844 from Michaelin007/jpaguide
https://jira.baeldung.com/browse/BAEL-8679
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‎persistence-modules/spring-jpa-2/src/main/java/com/baeldung/spring/jpa/guide/JpaGuideApp.java

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package com.baeldung.spring.jpa.guide;
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import com.baeldung.spring.jpa.guide.model.Publishers;
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import com.baeldung.spring.jpa.guide.repository.PublisherRepository;
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import org.springframework.boot.CommandLineRunner;
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import org.springframework.boot.SpringApplication;
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import org.springframework.boot.autoconfigure.SpringBootApplication;
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import org.springframework.context.annotation.Bean;
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@SpringBootApplication
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public class JpaGuideApp {
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public static void main(String[] args) {
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SpringApplication.run(JpaGuideApp.class, args);
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}
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@Bean
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public CommandLineRunner demo(PublisherRepository publisherRepository) {
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return (args) -> {
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publisherRepository.save(new Publishers("Spring", "Dallas", 10));
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};
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}
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}

‎persistence-modules/spring-jpa-2/src/main/java/com/baeldung/spring/jpa/guide/PublisherController.java

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package com.baeldung.spring.jpa.guide;
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import com.baeldung.spring.jpa.guide.model.Publishers;
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import com.baeldung.spring.jpa.guide.service.PublisherService;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.http.ResponseEntity;
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import org.springframework.web.bind.annotation.*;
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import java.util.List;
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@RestController
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@RequestMapping("/publishers")
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public class PublisherController {
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private final PublisherService publisherService;
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@Autowired
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public PublisherController(PublisherService publisherService) {
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this.publisherService = publisherService;
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}
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@PostMapping("/save")
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public ResponseEntity<Publishers> save(@RequestBody Publishers publishers) {
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Publishers savedPublisher = publisherService.save(publishers);
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return ResponseEntity.ok(savedPublisher);
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}
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@GetMapping("/all")
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public ResponseEntity<List<Publishers>> findAll() {
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List<Publishers> publishersList = publisherService.findAll();
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return ResponseEntity.ok(publishersList);
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}
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@GetMapping("/{id}")
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public ResponseEntity<Publishers> findById(@PathVariable int id) {
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Publishers publisher = publisherService.findById(id);
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return ResponseEntity.ok(publisher);
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}
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@PutMapping("/update")
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public ResponseEntity<Publishers> update(@RequestBody Publishers publishers) {
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Publishers updatedPublisher = publisherService.update(publishers);
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return ResponseEntity.ok(updatedPublisher);
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}
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@DeleteMapping("/{id}")
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public ResponseEntity<Void> delete(@PathVariable int id) {
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publisherService.delete(id);
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return ResponseEntity.noContent()
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.build();
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}
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@GetMapping("/location/{location}")
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public ResponseEntity<List<Publishers>> findAllByLocation(@PathVariable String location) {
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List<Publishers> publishersList = publisherService.findAllByLocation(location);
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return ResponseEntity.ok(publishersList);
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}
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@GetMapping("/min-journals")
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public ResponseEntity<List<Publishers>> findPublishersWithMinJournalsInLocation(@RequestParam int minJournals, @RequestParam String location) {
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List<Publishers> publishersList = publisherService.findPublishersWithMinJournalsInLocation(minJournals, location);
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return ResponseEntity.ok(publishersList);
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}
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}

‎persistence-modules/spring-jpa-2/src/main/java/com/baeldung/spring/jpa/guide/model/Publishers.java

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package com.baeldung.spring.jpa.guide.model;
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import jakarta.persistence.Entity;
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import jakarta.persistence.GeneratedValue;
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import jakarta.persistence.GenerationType;
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import jakarta.persistence.Id;
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@Entity
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public class Publishers {
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@Id
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@GeneratedValue(strategy = GenerationType.IDENTITY)
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private int id;
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private String name;
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private String location;
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private int journals;
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public Publishers() {
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}
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public Publishers(String name, String location, int journals) {
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this.name = name;
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this.location = location;
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this.journals = journals;
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}
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public int getId() {
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return id;
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}
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public void setId(int id) {
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this.id = id;
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}
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public String getName() {
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return name;
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}
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public void setName(String name) {
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this.name = name;
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}
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public String getLocation() {
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return location;
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}
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public void setLocation(String location) {
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this.location = location;
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}
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public int getJournals() {
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return journals;
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}
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public void setJournals(int journals) {
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this.journals = journals;
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}
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}

‎persistence-modules/spring-jpa-2/src/main/java/com/baeldung/spring/jpa/guide/repository/PublisherRepository.java

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package com.baeldung.spring.jpa.guide.repository;
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import com.baeldung.spring.jpa.guide.model.Publishers;
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import org.springframework.data.jpa.repository.JpaRepository;
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import org.springframework.data.jpa.repository.Query;
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import java.util.List;
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public interface PublisherRepository extends JpaRepository<Publishers, Integer> {
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List<Publishers> findAllByLocation(String location);
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@Query("SELECT p FROM Publishers p WHERE p.journals > :minJournals AND p.location = :location")
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List<Publishers> findPublishersWithMinJournalsInLocation(int minJournals, String location);
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}

‎persistence-modules/spring-jpa-2/src/main/java/com/baeldung/spring/jpa/guide/service/PublisherService.java

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package com.baeldung.spring.jpa.guide.service;
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import com.baeldung.spring.jpa.guide.model.Publishers;
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import com.baeldung.spring.jpa.guide.repository.PublisherRepository;
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import org.springframework.stereotype.Service;
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import java.util.List;
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@Service
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public class PublisherService {
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private final PublisherRepository publisherRepository;
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public PublisherService(PublisherRepository publisherRepository) {
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this.publisherRepository = publisherRepository;
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}
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public Publishers save(Publishers publishers) {
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return publisherRepository.save(publishers);
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}
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public List<Publishers> findAll() {
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return publisherRepository.findAll();
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}
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public Publishers findById(int id) {
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return publisherRepository.findById(id)
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.orElseThrow(() -> new RuntimeException("Publisher not found"));
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}
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public void delete(int id) {
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publisherRepository.deleteById(id);
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}
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public Publishers update(Publishers publishers) {
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return publisherRepository.save(publishers);
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}
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public List<Publishers> findAllByLocation(String location) {
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return publisherRepository.findAllByLocation(location);
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}
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public List<Publishers> findPublishersWithMinJournalsInLocation(int minJournals, String location) {
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return publisherRepository.findPublishersWithMinJournalsInLocation(minJournals, location);
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}
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}

‎persistence-modules/spring-jpa-2/src/main/resources/application-h2.properties

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spring.datasource.driver-class-name=org.h2.Driver
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spring.datasource.username=sa
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spring.datasource.password=
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spring.datasource.url=jdbc:h2:mem:db;DB_CLOSE_DELAY=-1
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spring.jpa.hibernate.ddl-auto=update
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spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.H2Dialect

‎persistence-modules/spring-jpa-2/src/main/resources/application.properties

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spring.datasource.username=sa
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spring.datasource.password=
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spring.datasource.url=jdbc:h2:mem:db;DB_CLOSE_DELAY=-1
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spring.profiles.active=h2
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# MySQL
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#spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver

‎persistence-modules/spring-jpa-2/src/test/java/com/baeldung/jpaguide/JpaGuideUnitTest.java

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package com.baeldung.jpaguide;
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import com.baeldung.spring.jpa.guide.model.Publishers;
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import com.baeldung.spring.jpa.guide.repository.PublisherRepository;
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import com.baeldung.spring.jpa.guide.service.PublisherService;
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import org.junit.Test;
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import java.util.Arrays;
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import java.util.List;
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import java.util.Optional;
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import static org.junit.Assert.assertEquals;
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import static org.junit.Assert.assertNotNull;
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import static org.mockito.Mockito.mock;
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import static org.mockito.Mockito.spy;
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import static org.mockito.Mockito.times;
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import static org.mockito.Mockito.verify;
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import static org.mockito.Mockito.when;
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import static org.mockito.ArgumentMatchers.any;
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import static org.mockito.ArgumentMatchers.anyInt;
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import static org.mockito.ArgumentMatchers.anyString;
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public class JpaGuideUnitTest {
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@Test
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public void givenPublisher_whenSave_thenPublisherIsSaved() {
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PublisherRepository publisherRepository = mock(PublisherRepository.class);
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PublisherService publisherService = spy(new PublisherService(publisherRepository));
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Publishers publishers = new Publishers("Springer", "Dallas", 10);
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when(publisherRepository.save(any(Publishers.class))).thenReturn(publishers);
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publisherService.save(publishers);
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verify(publisherRepository, times(1)).save(any(Publishers.class));
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}
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@Test
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public void givenPublishers_whenFindAll_thenReturnAllPublishers() {
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PublisherRepository publisherRepository = mock(PublisherRepository.class);
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PublisherService publisherService = new PublisherService(publisherRepository);
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List<Publishers> publishersList = Arrays.asList(new Publishers("Springer", "Dallas", 10), new Publishers("O'Reilly", "San Francisco", 20));
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when(publisherRepository.findAll()).thenReturn(publishersList);
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List<Publishers> result = publisherService.findAll();
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assertEquals(2, result.size());
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verify(publisherRepository, times(1)).findAll();
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}
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@Test
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public void givenPublisherId_whenFindById_thenReturnPublisher() {
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PublisherRepository publisherRepository = mock(PublisherRepository.class);
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PublisherService publisherService = new PublisherService(publisherRepository);
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Publishers publisher = new Publishers("Springer", "Dallas", 10);
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when(publisherRepository.findById(anyInt())).thenReturn(Optional.of(publisher));
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Publishers result = publisherService.findById(1);
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assertNotNull(result);
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verify(publisherRepository, times(1)).findById(anyInt());
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}
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@Test
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public void givenPublisher_whenUpdate_thenPublisherIsUpdated() {
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PublisherRepository publisherRepository = mock(PublisherRepository.class);
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PublisherService publisherService = new PublisherService(publisherRepository);
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Publishers publisher = new Publishers("Springer", "Dallas", 10);
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when(publisherRepository.save(any(Publishers.class))).thenReturn(publisher);
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Publishers result = publisherService.update(publisher);
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assertNotNull(result);
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verify(publisherRepository, times(1)).save(any(Publishers.class));
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}
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@Test
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public void givenLocation_whenFindAllByLocation_thenReturnPublishersInLocation() {
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PublisherRepository publisherRepository = mock(PublisherRepository.class);
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PublisherService publisherService = new PublisherService(publisherRepository);
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List<Publishers> publishersList = Arrays.asList(new Publishers("Springer", "Dallas", 10), new Publishers("O'Reilly", "Dallas", 20));
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when(publisherRepository.findAllByLocation(anyString())).thenReturn(publishersList);
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List<Publishers> result = publisherService.findAllByLocation("Dallas");
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assertEquals(2, result.size());
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verify(publisherRepository, times(1)).findAllByLocation(anyString());
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}
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@Test
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public void givenMinJournalsAndLocation_whenFindPublishersWithMinJournalsInLocation_thenReturnPublishers() {
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PublisherRepository publisherRepository = mock(PublisherRepository.class);
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PublisherService publisherService = new PublisherService(publisherRepository);
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List<Publishers> publishersList = Arrays.asList(new Publishers("Springer", "Dallas", 10), new Publishers("O'Reilly", "Dallas", 20));
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when(publisherRepository.findPublishersWithMinJournalsInLocation(anyInt(), anyString())).thenReturn(publishersList);
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List<Publishers> result = publisherService.findPublishersWithMinJournalsInLocation(5, "Dallas");
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assertEquals(2, result.size());
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verify(publisherRepository, times(1)).findPublishersWithMinJournalsInLocation(anyInt(), anyString());
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}
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}

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