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Spring Data JPA projections (#6733)

This commit is contained in:
nguyennamthai 2019-04-16 01:05:18 +07:00 committed by Grzegorz Piwowarek
parent 6796ec3af7
commit 4ca3d5049d
10 changed files with 249 additions and 0 deletions
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57
persistence-modules/spring-data-jpa-2/src/main/java/com/baeldung/projection/model/Address.java Normal file
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package com.baeldung.projection.model;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.OneToOne;
@Entity
public class Address {
@Id
private Long id;
@OneToOne
private Person person;
private String state;
private String city;
private String street;
private String zipCode;
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getState() {
return state;
}
public void setState(String state) {
this.state = state;
}
public String getCity() {
return city;
}
public void setCity(String city) {
this.city = city;
}
public String getStreet() {
return street;
}
public void setStreet(String street) {
this.street = street;
}
public String getZipCode() {
return zipCode;
}
public void setZipCode(String zipCode) {
this.zipCode = zipCode;
}
}

47
persistence-modules/spring-data-jpa-2/src/main/java/com/baeldung/projection/model/Person.java Normal file
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package com.baeldung.projection.model;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.OneToOne;
@Entity
public class Person {
@Id
private Long id;
private String firstName;
private String lastName;
@OneToOne(mappedBy = "person")
private Address address;
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
public Address getAddress() {
return address;
}
public void setAddress(Address address) {
this.address = address;
}
}

11
persistence-modules/spring-data-jpa-2/src/main/java/com/baeldung/projection/repository/AddressRepository.java Normal file
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package com.baeldung.projection.repository;
import com.baeldung.projection.view.AddressView;
import com.baeldung.projection.model.Address;
import org.springframework.data.repository.Repository;
import java.util.List;
public interface AddressRepository extends Repository<Address, Long> {
List<AddressView> getAddressByState(String state);
}

14
persistence-modules/spring-data-jpa-2/src/main/java/com/baeldung/projection/repository/PersonRepository.java Normal file
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package com.baeldung.projection.repository;
import com.baeldung.projection.model.Person;
import com.baeldung.projection.view.PersonDto;
import com.baeldung.projection.view.PersonView;
import org.springframework.data.repository.Repository;
public interface PersonRepository extends Repository<Person, Long> {
PersonView findByLastName(String lastName);
PersonDto findByFirstName(String firstName);
<T> T findByLastName(String lastName, Class<T> type);
}

7
persistence-modules/spring-data-jpa-2/src/main/java/com/baeldung/projection/view/AddressView.java Normal file
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package com.baeldung.projection.view;
public interface AddressView {
String getZipCode();
PersonView getPerson();
}

34
persistence-modules/spring-data-jpa-2/src/main/java/com/baeldung/projection/view/PersonDto.java Normal file
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package com.baeldung.projection.view;
import java.util.Objects;
public class PersonDto {
private final String firstName;
private final String lastName;
public PersonDto(String firstName, String lastName) {
this.firstName = firstName;
this.lastName = lastName;
}
public String getFirstName() {
return firstName;
}
public String getLastName() {
return lastName;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
PersonDto personDto = (PersonDto) o;
return Objects.equals(firstName, personDto.firstName) && Objects.equals(lastName, personDto.lastName);
}
@Override
public int hashCode() {
return Objects.hash(firstName, lastName);
}
}

12
persistence-modules/spring-data-jpa-2/src/main/java/com/baeldung/projection/view/PersonView.java Normal file
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package com.baeldung.projection.view;
import org.springframework.beans.factory.annotation.Value;
public interface PersonView {
String getFirstName();
String getLastName();
@Value("#{target.firstName + ' ' + target.lastName}")
String getFullName();
}

63
persistence-modules/spring-data-jpa-2/src/test/java/com/baeldung/projection/JpaProjectionIntegrationTest.java Normal file
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package com.baeldung.projection;
import com.baeldung.projection.model.Person;
import com.baeldung.projection.repository.AddressRepository;
import com.baeldung.projection.repository.PersonRepository;
import com.baeldung.projection.view.AddressView;
import com.baeldung.projection.view.PersonDto;
import com.baeldung.projection.view.PersonView;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.autoconfigure.orm.jpa.DataJpaTest;
import org.springframework.test.context.jdbc.Sql;
import org.springframework.test.context.junit4.SpringRunner;
import static org.assertj.core.api.Assertions.assertThat;
import static org.springframework.test.context.jdbc.Sql.ExecutionPhase.AFTER_TEST_METHOD;
@DataJpaTest
@RunWith(SpringRunner.class)
@Sql(scripts = "/projection-insert-data.sql")
@Sql(scripts = "/projection-clean-up-data.sql", executionPhase = AFTER_TEST_METHOD)
public class JpaProjectionIntegrationTest {
@Autowired
private AddressRepository addressRepository;
@Autowired
private PersonRepository personRepository;
@Test
public void whenUsingClosedProjections_thenViewWithRequiredPropertiesIsReturned() {
AddressView addressView = addressRepository.getAddressByState("CA").get(0);
assertThat(addressView.getZipCode()).isEqualTo("90001");
PersonView personView = addressView.getPerson();
assertThat(personView.getFirstName()).isEqualTo("John");
assertThat(personView.getLastName()).isEqualTo("Doe");
}
@Test
public void whenUsingOpenProjections_thenViewWithRequiredPropertiesIsReturned() {
PersonView personView = personRepository.findByLastName("Doe");
assertThat(personView.getFullName()).isEqualTo("John Doe");
}
@Test
public void whenUsingClassBasedProjections_thenDtoWithRequiredPropertiesIsReturned() {
PersonDto personDto = personRepository.findByFirstName("John");
assertThat(personDto.getFirstName()).isEqualTo("John");
assertThat(personDto.getLastName()).isEqualTo("Doe");
}
@Test
public void whenUsingDynamicProjections_thenObjectWithRequiredPropertiesIsReturned() {
Person person = personRepository.findByLastName("Doe", Person.class);
PersonView personView = personRepository.findByLastName("Doe", PersonView.class);
PersonDto personDto = personRepository.findByLastName("Doe", PersonDto.class);
assertThat(person.getFirstName()).isEqualTo("John");
assertThat(personView.getFirstName()).isEqualTo("John");
assertThat(personDto.getFirstName()).isEqualTo("John");
}
}

2
persistence-modules/spring-data-jpa-2/src/test/resources/projection-clean-up-data.sql Normal file
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DELETE FROM address;
DELETE FROM person;

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persistence-modules/spring-data-jpa-2/src/test/resources/projection-insert-data.sql Normal file
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INSERT INTO person(id,first_name,last_name) VALUES (1,'John','Doe');
INSERT INTO address(id,person_id,state,city,street,zip_code) VALUES (1,1,'CA', 'Los Angeles', 'Standford Ave', '90001');