JAVA-66: New module spring-data-jpa-query

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sampadawagde 2020-07-19 14:31:01 +05:30
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## Spring Data JPA - Query
This module contains articles about querying data using Spring Data JPA
### Relevant Articles:
- [Query Entities by Dates and Times with Spring Data JPA](https://www.baeldung.com/spring-data-jpa-query-by-date)
- [The Exists Query in Spring Data](https://www.baeldung.com/spring-data-exists-query)
- [Customizing the Result of JPA Queries with Aggregation Functions](https://www.baeldung.com/jpa-queries-custom-result-with-aggregation-functions)
- [Limiting Query Results with JPA and Spring Data JPA](https://www.baeldung.com/jpa-limit-query-results)
- [Sorting Query Results with Spring Data](https://www.baeldung.com/spring-data-sorting)
- [Spring Data JPA Query by Example](https://www.baeldung.com/spring-data-query-by-example)
- [JPA Join Types](https://www.baeldung.com/jpa-join-types)
- [Spring Data JPA and Named Entity Graphs](https://www.baeldung.com/spring-data-jpa-named-entity-graphs)
### Eclipse Config
After importing the project into Eclipse, you may see the following error:
"No persistence xml file found in project"
This can be ignored:
- Project -> Properties -> Java Persistance -> JPA -> Error/Warnings -> Select Ignore on "No persistence xml file found in project"
Or:
- Eclipse -> Preferences - Validation - disable the "Build" execution of the JPA Validator

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<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<artifactId>spring-data-jpa-query</artifactId>
<name>spring-data-jpa-query</name>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-boot-2</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-boot-2</relativePath>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
</dependency>
<dependency>
<groupId>net.ttddyy</groupId>
<artifactId>datasource-proxy</artifactId>
<version>${datasource-proxy.version}</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-oxm</artifactId>
</dependency>
</dependencies>
<properties>
<datasource-proxy.version>1.4.1</datasource-proxy.version>
</properties>
</project>

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package com.baeldung;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}

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package com.baeldung.aggregation.model;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.ManyToOne;
import java.util.Objects;
@Entity
public class Comment {
@Id
private Integer id;
private Integer year;
private boolean approved;
private String content;
@ManyToOne
private Post post;
public Comment() {
}
public Comment(int id, int year, boolean approved, String content, Post post) {
this.id = id;
this.year = year;
this.approved = approved;
this.content = content;
this.post = post;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public Integer getYear() {
return year;
}
public void setYear(Integer year) {
this.year = year;
}
public boolean isApproved() {
return approved;
}
public void setApproved(boolean approved) {
this.approved = approved;
}
public String getContent() {
return content;
}
public void setContent(String content) {
this.content = content;
}
public Post getPost() {
return post;
}
public void setPost(Post post) {
this.post = post;
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (!(o instanceof Comment)) {
return false;
}
Comment comment = (Comment) o;
return getId().equals(comment.getId());
}
@Override
public int hashCode() {
return Objects.hash(getId());
}
}

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package com.baeldung.aggregation.model;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.OneToMany;
import java.util.List;
import java.util.Objects;
@Entity
public class Post {
@Id
private Integer id;
private String title;
private String content;
@OneToMany(mappedBy = "post")
private List<Comment> comments;
public Post() {
}
public Post(Integer id, String title, String content) {
this.id = id;
this.title = title;
this.content = content;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getContent() {
return content;
}
public void setContent(String content) {
this.content = content;
}
public List<Comment> getComments() {
return comments;
}
public void setComments(List<Comment> comments) {
this.comments = comments;
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (!(o instanceof Post)) {
return false;
}
Post post = (Post) o;
return getId().equals(post.getId());
}
@Override
public int hashCode() {
return Objects.hash(getId());
}
}

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package com.baeldung.aggregation.model.custom;
public class CommentCount {
private Integer year;
private Long total;
public CommentCount(Integer year, Long total) {
this.year = year;
this.total = total;
}
public Integer getYear() {
return year;
}
public void setYear(Integer year) {
this.year = year;
}
public Long getTotal() {
return total;
}
public void setTotal(Long total) {
this.total = total;
}
}

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package com.baeldung.aggregation.model.custom;
public interface ICommentCount {
Integer getYearComment();
Long getTotalComment();
}

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package com.baeldung.aggregation.repository;
import com.baeldung.aggregation.model.Comment;
import com.baeldung.aggregation.model.custom.CommentCount;
import com.baeldung.aggregation.model.custom.ICommentCount;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.Query;
import org.springframework.stereotype.Repository;
import java.util.List;
@Repository
public interface CommentRepository extends JpaRepository<Comment, Integer> {
@Query("SELECT c.year, COUNT(c.year) FROM Comment AS c GROUP BY c.year ORDER BY c.year DESC")
List<Object[]> countTotalCommentsByYear();
@Query("SELECT new com.baeldung.aggregation.model.custom.CommentCount(c.year, COUNT(c.year)) FROM Comment AS c GROUP BY c.year ORDER BY c.year DESC")
List<CommentCount> countTotalCommentsByYearClass();
@Query("SELECT c.year AS yearComment, COUNT(c.year) AS totalComment FROM Comment AS c GROUP BY c.year ORDER BY c.year DESC")
List<ICommentCount> countTotalCommentsByYearInterface();
@Query(value = "SELECT c.year AS yearComment, COUNT(c.*) AS totalComment FROM comment AS c GROUP BY c.year ORDER BY c.year DESC", nativeQuery = true)
List<ICommentCount> countTotalCommentsByYearNative();
}

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package com.baeldung.boot.daos;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.Query;
import org.springframework.data.repository.query.Param;
import com.baeldung.boot.domain.Article;
import java.util.Date;
import java.util.List;
public interface ArticleRepository extends JpaRepository<Article, Integer> {
List<Article> findAllByPublicationDate(Date publicationDate);
List<Article> findAllByPublicationTimeBetween(Date publicationTimeStart,
Date publicationTimeEnd);
@Query("select a from Article a where a.creationDateTime <= :creationDateTime")
List<Article> findAllWithCreationDateTimeBefore(
@Param("creationDateTime") Date creationDateTime);
}

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package com.baeldung.boot.domain;
import javax.persistence.*;
import java.util.Date;
@Entity
public class Article {
@Id
@GeneratedValue
private Integer id;
@Temporal(TemporalType.DATE)
private Date publicationDate;
@Temporal(TemporalType.TIME)
private Date publicationTime;
@Temporal(TemporalType.TIMESTAMP)
private Date creationDateTime;
public Integer getId() {
return id;
}
}

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package com.baeldung.boot.passenger;
import java.util.List;
interface CustomPassengerRepository {
List<Passenger> findOrderedBySeatNumberLimitedTo(int limit);
}

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package com.baeldung.boot.passenger;
import javax.persistence.Basic;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import java.util.Objects;
@Entity
class Passenger {
@Id
@GeneratedValue
@Column(nullable = false)
private Long id;
@Basic(optional = false)
@Column(nullable = false)
private String firstName;
@Basic(optional = false)
@Column(nullable = false)
private String lastName;
@Basic(optional = false)
@Column(nullable = false)
private Integer seatNumber;
private Passenger(String firstName, String lastName, Integer seatNumber) {
this.firstName = firstName;
this.lastName = lastName;
this.seatNumber = seatNumber;
}
static Passenger from(String firstName, String lastName, Integer seatNumber) {
return new Passenger(firstName, lastName, seatNumber);
}
@Override
public boolean equals(Object object) {
if (this == object)
return true;
if (object == null || getClass() != object.getClass())
return false;
Passenger passenger = (Passenger) object;
return getSeatNumber() == passenger.getSeatNumber() && Objects.equals(getFirstName(), passenger.getFirstName())
&& Objects.equals(getLastName(), passenger.getLastName());
}
@Override
public int hashCode() {
return Objects.hash(getFirstName(), getLastName(), getSeatNumber());
}
@Override
public String toString() {
final StringBuilder toStringBuilder = new StringBuilder(getClass().getSimpleName());
toStringBuilder.append("{ id=").append(id);
toStringBuilder.append(", firstName='").append(firstName).append('\'');
toStringBuilder.append(", lastName='").append(lastName).append('\'');
toStringBuilder.append(", seatNumber=").append(seatNumber);
toStringBuilder.append('}');
return toStringBuilder.toString();
}
Long getId() {
return id;
}
String getFirstName() {
return firstName;
}
String getLastName() {
return lastName;
}
Integer getSeatNumber() {
return seatNumber;
}
}

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package com.baeldung.boot.passenger;
import java.util.List;
import org.springframework.data.domain.Sort;
import org.springframework.data.jpa.repository.JpaRepository;
interface PassengerRepository extends JpaRepository<Passenger, Long>, CustomPassengerRepository {
Passenger findFirstByOrderBySeatNumberAsc();
Passenger findTopByOrderBySeatNumberAsc();
List<Passenger> findByOrderBySeatNumberAsc();
List<Passenger> findByFirstNameIgnoreCase(String firstName);
List<Passenger> findByLastNameOrderBySeatNumberAsc(String lastName);
List<Passenger> findByLastName(String lastName, Sort sort);
}

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package com.baeldung.boot.passenger;
import org.springframework.stereotype.Repository;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import java.util.List;
@Repository
class PassengerRepositoryImpl implements CustomPassengerRepository {
@PersistenceContext
private EntityManager entityManager;
@Override
public List<Passenger> findOrderedBySeatNumberLimitedTo(int limit) {
return entityManager.createQuery("SELECT p FROM Passenger p ORDER BY p.seatNumber",
Passenger.class).setMaxResults(limit).getResultList();
}
}

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package com.baeldung.entitygraph.model;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
@Entity
public class Characteristic {
@Id
private Long id;
private String type;
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn
private Item item;
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
public Item getItem() {
return item;
}
public void setItem(Item item) {
this.item = item;
}
}

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package com.baeldung.entitygraph.model;
import java.util.ArrayList;
import java.util.List;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.NamedAttributeNode;
import javax.persistence.NamedEntityGraph;
import javax.persistence.OneToMany;
@Entity
@NamedEntityGraph(name = "Item.characteristics",
attributeNodes = @NamedAttributeNode("characteristics")
)
public class Item {
@Id
private Long id;
private String name;
@OneToMany(mappedBy = "item")
private List<Characteristic> characteristics = new ArrayList<>();
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public List<Characteristic> getCharacteristics() {
return characteristics;
}
public void setCharacteristics(List<Characteristic> characteristics) {
this.characteristics = characteristics;
}
}

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package com.baeldung.entitygraph.repository;
import org.springframework.data.jpa.repository.EntityGraph;
import org.springframework.data.jpa.repository.JpaRepository;
import com.baeldung.entitygraph.model.Characteristic;
public interface CharacteristicsRepository extends JpaRepository<Characteristic, Long> {
@EntityGraph(attributePaths = {"item"})
Characteristic findByType(String type);
}

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package com.baeldung.entitygraph.repository;
import org.springframework.data.jpa.repository.EntityGraph;
import org.springframework.data.jpa.repository.EntityGraph.EntityGraphType;
import org.springframework.data.jpa.repository.JpaRepository;
import com.baeldung.entitygraph.model.Item;
public interface ItemRepository extends JpaRepository<Item, Long> {
@EntityGraph(value = "Item.characteristics", type = EntityGraphType.FETCH)
Item findByName(String name);
}

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package com.baeldung.exists;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
/**
* @author paullatzelsperger
* @since 2019-03-20
*/
@Entity
public class Car {
@Id
@GeneratedValue
private int id;
private Integer power;
private String model;
Car() {
}
public Car(int power, String model) {
this.power = power;
this.model = model;
}
public Integer getPower() {
return power;
}
public void setPower(Integer power) {
this.power = power;
}
public String getModel() {
return model;
}
public void setModel(String model) {
this.model = model;
}
public int getId() {
return id;
}
}

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package com.baeldung.exists;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.Query;
import org.springframework.data.repository.query.Param;
import org.springframework.stereotype.Repository;
/**
* @author paullatzelsperger
* @since 2019-03-20
*/
@Repository
public interface CarRepository extends JpaRepository<Car, Integer> {
boolean existsCarByPower(int power);
boolean existsCarByModel(String model);
@Query("select case when count(c)> 0 then true else false end from Car c where c.model = :model")
boolean existsCarExactCustomQuery(@Param("model") String model);
@Query("select case when count(c)> 0 then true else false end from Car c where lower(c.model) like lower(:model)")
boolean existsCarLikeCustomQuery(@Param("model") String model);
}

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package com.baeldung.joins.model;
import java.util.List;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.OneToMany;
@Entity
public class Department {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private long id;
private String name;
@OneToMany(mappedBy = "department")
private List<Employee> employees;
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public List<Employee> getEmployees() {
return employees;
}
public void setEmployees(List<Employee> employees) {
this.employees = employees;
}
}

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package com.baeldung.joins.model;
import java.util.List;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.ManyToOne;
import javax.persistence.OneToMany;
import javax.persistence.Table;
@Entity
@Table(name = "joins_employee")
public class Employee {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private long id;
private String name;
private int age;
@ManyToOne
private Department department;
@OneToMany(mappedBy = "employee")
private List<Phone> phones;
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public Department getDepartment() {
return department;
}
public void setDepartment(Department department) {
this.department = department;
}
public List<Phone> getPhones() {
return phones;
}
public void setPhones(List<Phone> phones) {
this.phones = phones;
}
}

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package com.baeldung.joins.model;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.ManyToOne;
@Entity
public class Phone {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private long id;
private String number;
@ManyToOne
private Employee employee;
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
public String getNumber() {
return number;
}
public void setNumber(String number) {
this.number = number;
}
public Employee getEmployee() {
return employee;
}
public void setEmployee(Employee employee) {
this.employee = employee;
}
}

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<?xml version="1.0" encoding="UTF-8"?>
<fruit>
<id>1</id>
<name>apple</name>
<color>red</color>
</fruit>

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spring.datasource.data=classpath:db/import_joins.sql

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spring.jpa.show-sql=true

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INSERT INTO department (id, name) VALUES (1, 'Infra');
INSERT INTO department (id, name) VALUES (2, 'Accounting');
INSERT INTO department (id, name) VALUES (3, 'Management');
INSERT INTO joins_employee (id, name, age, department_id) VALUES (1, 'Baeldung', '35', 1);
INSERT INTO joins_employee (id, name, age, department_id) VALUES (2, 'John', '35', 2);
INSERT INTO joins_employee (id, name, age, department_id) VALUES (3, 'Jane', '35', 2);
INSERT INTO phone (id, number, employee_id) VALUES (1, '111', 1);
INSERT INTO phone (id, number, employee_id) VALUES (2, '222', 1);
INSERT INTO phone (id, number, employee_id) VALUES (3, '333', 1);
COMMIT;

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[
{
"_class": "com.baeldung.entity.Fruit",
"name": "apple",
"color": "red",
"id": 1
},
{
"_class": "com.baeldung.entity.Fruit",
"name": "guava",
"color": "green",
"id": 2
}
]

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<?xml version="1.0" encoding="UTF-8"?>
<fruit>
<id>2</id>
<name>guava</name>
<color>green</color>
</fruit>

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insert into Article(id, publication_date, publication_time, creation_date_time) values(1, TO_DATE('01/01/2018', 'DD/MM/YYYY'), TO_DATE('15:00', 'HH24:MI'), TO_DATE('31/12/2017 07:30', 'DD/MM/YYYY HH24:MI'));
insert into Article(id, publication_date, publication_time, creation_date_time) values(2, TO_DATE('01/01/2018', 'DD/MM/YYYY'), TO_DATE('15:30', 'HH24:MI'), TO_DATE('15/12/2017 08:00', 'DD/MM/YYYY HH24:MI'));
insert into Article(id, publication_date, publication_time, creation_date_time) values(3, TO_DATE('15/12/2017', 'DD/MM/YYYY'), TO_DATE('16:00', 'HH24:MI'), TO_DATE('01/12/2017 13:45', 'DD/MM/YYYY HH24:MI'));

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package com.baeldung.aggregation;
import com.baeldung.aggregation.model.custom.CommentCount;
import com.baeldung.aggregation.model.custom.ICommentCount;
import com.baeldung.aggregation.repository.CommentRepository;
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 java.util.List;
import static org.hamcrest.CoreMatchers.is;
import static org.junit.Assert.assertThat;
@RunWith(SpringRunner.class)
@DataJpaTest
@Sql(scripts = "/test-aggregation-data.sql")
public class SpringDataAggregateIntegrationTest {
@Autowired
private CommentRepository commentRepository;
@Test
public void whenQueryWithAggregation_thenReturnResult() {
List<Object[]> commentCountsByYear = commentRepository.countTotalCommentsByYear();
Object[] countYear2019 = commentCountsByYear.get(0);
assertThat(countYear2019[0], is(Integer.valueOf(2019)));
assertThat(countYear2019[1], is(1l));
Object[] countYear2018 = commentCountsByYear.get(1);
assertThat(countYear2018[0], is(Integer.valueOf(2018)));
assertThat(countYear2018[1], is(2l));
Object[] countYear2017 = commentCountsByYear.get(2);
assertThat(countYear2017[0], is(Integer.valueOf(2017)));
assertThat(countYear2017[1], is(1l));
}
@Test
public void whenQueryWithAggregation_thenReturnCustomResult() {
List<CommentCount> commentCountsByYear = commentRepository.countTotalCommentsByYearClass();
CommentCount countYear2019 = commentCountsByYear.get(0);
assertThat(countYear2019.getYear(), is(Integer.valueOf(2019)));
assertThat(countYear2019.getTotal(), is(1l));
CommentCount countYear2018 = commentCountsByYear.get(1);
assertThat(countYear2018.getYear(), is(Integer.valueOf(2018)));
assertThat(countYear2018.getTotal(), is(2l));
CommentCount countYear2017 = commentCountsByYear.get(2);
assertThat(countYear2017.getYear(), is(Integer.valueOf(2017)));
assertThat(countYear2017.getTotal(), is(1l));
}
@Test
public void whenQueryWithAggregation_thenReturnInterfaceResult() {
List<ICommentCount> commentCountsByYear = commentRepository.countTotalCommentsByYearInterface();
ICommentCount countYear2019 = commentCountsByYear.get(0);
assertThat(countYear2019.getYearComment(), is(Integer.valueOf(2019)));
assertThat(countYear2019.getTotalComment(), is(1l));
ICommentCount countYear2018 = commentCountsByYear.get(1);
assertThat(countYear2018.getYearComment(), is(Integer.valueOf(2018)));
assertThat(countYear2018.getTotalComment(), is(2l));
ICommentCount countYear2017 = commentCountsByYear.get(2);
assertThat(countYear2017.getYearComment(), is(Integer.valueOf(2017)));
assertThat(countYear2017.getTotalComment(), is(1l));
}
@Test
public void whenNativeQueryWithAggregation_thenReturnInterfaceResult() {
List<ICommentCount> commentCountsByYear = commentRepository.countTotalCommentsByYearNative();
ICommentCount countYear2019 = commentCountsByYear.get(0);
assertThat(countYear2019.getYearComment(), is(Integer.valueOf(2019)));
assertThat(countYear2019.getTotalComment(), is(1l));
ICommentCount countYear2018 = commentCountsByYear.get(1);
assertThat(countYear2018.getYearComment(), is(Integer.valueOf(2018)));
assertThat(countYear2018.getTotalComment(), is(2l));
ICommentCount countYear2017 = commentCountsByYear.get(2);
assertThat(countYear2017.getYearComment(), is(Integer.valueOf(2017)));
assertThat(countYear2017.getTotalComment(), is(1l));
}
}

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package com.baeldung.boot.daos;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import java.text.SimpleDateFormat;
import java.util.Arrays;
import java.util.List;
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.junit4.SpringRunner;
import com.baeldung.boot.domain.Article;
@RunWith(SpringRunner.class)
@DataJpaTest(properties="spring.datasource.data=classpath:import_entities.sql")
public class ArticleRepositoryIntegrationTest {
@Autowired
private ArticleRepository repository;
@Test
public void givenImportedArticlesWhenFindAllByPublicationDateThenArticles1And2Returned()
throws Exception {
List<Article> result = repository.findAllByPublicationDate(
new SimpleDateFormat("yyyy-MM-dd").parse("2018-01-01")
);
assertEquals(2, result.size());
assertTrue(result.stream()
.map(Article::getId)
.allMatch(id -> Arrays.asList(1, 2).contains(id))
);
}
@Test
public void givenImportedArticlesWhenFindAllByPublicationTimeBetweenThenArticles2And3Returned()
throws Exception {
List<Article> result = repository.findAllByPublicationTimeBetween(
new SimpleDateFormat("HH:mm").parse("15:15"),
new SimpleDateFormat("HH:mm").parse("16:30")
);
assertEquals(2, result.size());
assertTrue(result.stream()
.map(Article::getId)
.allMatch(id -> Arrays.asList(2, 3).contains(id))
);
}
@Test
public void givenImportedArticlesWhenFindAllWithCreationDateTimeBeforeThenArticles2And3Returned() throws Exception {
List<Article> result = repository.findAllWithCreationDateTimeBefore(
new SimpleDateFormat("yyyy-MM-dd HH:mm").parse("2017-12-15 10:00")
);
assertEquals(2, result.size());
assertTrue(result.stream()
.map(Article::getId)
.allMatch(id -> Arrays.asList(2, 3).contains(id))
);
}
}

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package com.baeldung.boot.passenger;
import org.junit.Before;
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.data.domain.Example;
import org.springframework.data.domain.ExampleMatcher;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Sort;
import org.springframework.test.context.junit4.SpringRunner;
import com.baeldung.boot.passenger.Passenger;
import com.baeldung.boot.passenger.PassengerRepository;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import java.util.List;
import java.util.Optional;
import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.Matchers.contains;
import static org.hamcrest.core.IsNot.not;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
@DataJpaTest
@RunWith(SpringRunner.class)
public class PassengerRepositoryIntegrationTest {
@PersistenceContext
private EntityManager entityManager;
@Autowired
private PassengerRepository repository;
@Before
public void before() {
entityManager.persist(Passenger.from("Jill", "Smith", 50));
entityManager.persist(Passenger.from("Eve", "Jackson", 95));
entityManager.persist(Passenger.from("Fred", "Bloggs", 22));
entityManager.persist(Passenger.from("Ricki", "Bobbie", 36));
entityManager.persist(Passenger.from("Siya", "Kolisi", 85));
}
@Test
public void givenSeveralPassengersWhenOrderedBySeatNumberLimitedToThenThePassengerInTheFirstFilledSeatIsReturned() {
Passenger expected = Passenger.from("Fred", "Bloggs", 22);
List<Passenger> passengers = repository.findOrderedBySeatNumberLimitedTo(1);
assertEquals(1, passengers.size());
Passenger actual = passengers.get(0);
assertEquals(expected, actual);
}
@Test
public void givenSeveralPassengersWhenFindFirstByOrderBySeatNumberAscThenThePassengerInTheFirstFilledSeatIsReturned() {
Passenger expected = Passenger.from("Fred", "Bloggs", 22);
Passenger actual = repository.findFirstByOrderBySeatNumberAsc();
assertEquals(expected, actual);
}
@Test
public void givenSeveralPassengersWhenFindPageSortedByThenThePassengerInTheFirstFilledSeatIsReturned() {
Passenger expected = Passenger.from("Fred", "Bloggs", 22);
Page<Passenger> page = repository.findAll(PageRequest.of(0, 1,
Sort.by(Sort.Direction.ASC, "seatNumber")));
assertEquals(1, page.getContent().size());
Passenger actual = page.getContent().get(0);
assertEquals(expected, actual);
}
@Test
public void givenPassengers_whenOrderedBySeatNumberAsc_thenCorrectOrder() {
Passenger fred = Passenger.from("Fred", "Bloggs", 22);
Passenger ricki = Passenger.from("Ricki", "Bobbie", 36);
Passenger jill = Passenger.from("Jill", "Smith", 50);
Passenger siya = Passenger.from("Siya", "Kolisi", 85);
Passenger eve = Passenger.from("Eve", "Jackson", 95);
List<Passenger> passengers = repository.findByOrderBySeatNumberAsc();
assertThat(passengers, contains(fred, ricki, jill, siya, eve));
}
@Test
public void givenPassengers_whenFindAllWithSortBySeatNumberAsc_thenCorrectOrder() {
Passenger fred = Passenger.from("Fred", "Bloggs", 22);
Passenger ricki = Passenger.from("Ricki", "Bobbie", 36);
Passenger jill = Passenger.from("Jill", "Smith", 50);
Passenger siya = Passenger.from("Siya", "Kolisi", 85);
Passenger eve = Passenger.from("Eve", "Jackson", 95);
List<Passenger> passengers = repository.findAll(Sort.by(Sort.Direction.ASC, "seatNumber"));
assertThat(passengers, contains(fred, ricki, jill, siya, eve));
}
@Test
public void givenPassengers_whenFindByExampleDefaultMatcher_thenExpectedReturned() {
Example<Passenger> example = Example.of(Passenger.from("Fred", "Bloggs", null));
Optional<Passenger> actual = repository.findOne(example);
assertTrue(actual.isPresent());
assertEquals(Passenger.from("Fred", "Bloggs", 22), actual.get());
}
@Test
public void givenPassengers_whenFindByExampleCaseInsensitiveMatcher_thenExpectedReturned() {
ExampleMatcher caseInsensitiveExampleMatcher = ExampleMatcher.matchingAll().withIgnoreCase();
Example<Passenger> example = Example.of(Passenger.from("fred", "bloggs", null),
caseInsensitiveExampleMatcher);
Optional<Passenger> actual = repository.findOne(example);
assertTrue(actual.isPresent());
assertEquals(Passenger.from("Fred", "Bloggs", 22), actual.get());
}
@Test
public void givenPassengers_whenFindByExampleCustomMatcher_thenExpectedReturned() {
Passenger jill = Passenger.from("Jill", "Smith", 50);
Passenger eve = Passenger.from("Eve", "Jackson", 95);
Passenger fred = Passenger.from("Fred", "Bloggs", 22);
Passenger siya = Passenger.from("Siya", "Kolisi", 85);
Passenger ricki = Passenger.from("Ricki", "Bobbie", 36);
ExampleMatcher customExampleMatcher = ExampleMatcher.matchingAny().withMatcher("firstName",
ExampleMatcher.GenericPropertyMatchers.contains().ignoreCase()).withMatcher("lastName",
ExampleMatcher.GenericPropertyMatchers.contains().ignoreCase());
Example<Passenger> example = Example.of(Passenger.from("e", "s", null),
customExampleMatcher);
List<Passenger> passengers = repository.findAll(example);
assertThat(passengers, contains(jill, eve, fred, siya));
assertThat(passengers, not(contains(ricki)));
}
@Test
public void givenPassengers_whenFindByIgnoringMatcher_thenExpectedReturned() {
Passenger jill = Passenger.from("Jill", "Smith", 50);
Passenger eve = Passenger.from("Eve", "Jackson", 95);
Passenger fred = Passenger.from("Fred", "Bloggs", 22);
Passenger siya = Passenger.from("Siya", "Kolisi", 85);
Passenger ricki = Passenger.from("Ricki", "Bobbie", 36);
ExampleMatcher ignoringExampleMatcher = ExampleMatcher.matchingAny().withMatcher("lastName",
ExampleMatcher.GenericPropertyMatchers.startsWith().ignoreCase()).withIgnorePaths("firstName", "seatNumber");
Example<Passenger> example = Example.of(Passenger.from(null, "b", null),
ignoringExampleMatcher);
List<Passenger> passengers = repository.findAll(example);
assertThat(passengers, contains(fred, ricki));
assertThat(passengers, not(contains(jill)));
assertThat(passengers, not(contains(eve)));
assertThat(passengers, not(contains(siya)));
}
@Test
public void givenPassengers_whenMatchingIgnoreCase_thenExpectedReturned() {
Passenger jill = Passenger.from("Jill", "Smith", 50);
Passenger eve = Passenger.from("Eve", "Jackson", 95);
Passenger fred = Passenger.from("Fred", "Bloggs", 22);
Passenger siya = Passenger.from("Siya", "Kolisi", 85);
Passenger ricki = Passenger.from("Ricki", "Bobbie", 36);
List<Passenger> passengers = repository.findByFirstNameIgnoreCase("FRED");
assertThat(passengers, contains(fred));
assertThat(passengers, not(contains(eve)));
assertThat(passengers, not(contains(siya)));
assertThat(passengers, not(contains(jill)));
assertThat(passengers, not(contains(ricki)));
}
}

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package com.baeldung.entitygraph;
import static org.assertj.core.api.Assertions.assertThat;
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 com.baeldung.entitygraph.model.Characteristic;
import com.baeldung.entitygraph.model.Item;
import com.baeldung.entitygraph.repository.CharacteristicsRepository;
import com.baeldung.entitygraph.repository.ItemRepository;
@DataJpaTest
@RunWith(SpringRunner.class)
@Sql(scripts = "/entitygraph-data.sql")
public class EntityGraphIntegrationTest {
@Autowired
private ItemRepository itemRepo;
@Autowired
private CharacteristicsRepository characteristicsRepo;
@Test
public void givenEntityGraph_whenCalled_shouldRetrunDefinedFields() {
Item item = itemRepo.findByName("Table");
assertThat(item.getId()).isEqualTo(1L);
}
@Test
public void givenAdhocEntityGraph_whenCalled_shouldRetrunDefinedFields() {
Characteristic characteristic = characteristicsRepo.findByType("Rigid");
assertThat(characteristic.getId()).isEqualTo(1L);
}
}

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package com.baeldung.exists;
import com.baeldung.Application;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.data.domain.Example;
import org.springframework.data.domain.ExampleMatcher;
import org.springframework.test.context.junit4.SpringRunner;
import java.util.Arrays;
import java.util.List;
import static org.assertj.core.api.Assertions.assertThat;
import static org.springframework.data.domain.ExampleMatcher.GenericPropertyMatchers.ignoreCase;
@RunWith(SpringRunner.class)
@SpringBootTest(classes = {Application.class})
public class CarRepositoryIntegrationTest {
@Autowired
private CarRepository repository;
private int searchId;
@Before
public void setup() {
List<Car> cars = repository.saveAll(Arrays.asList(new Car(200, "BMW"), new Car(300, "Audi")));
searchId = cars.get(0).getId();
}
@After
public void teardown() {
repository.deleteAll();
}
@Test
public void whenIdIsCorrect_thenExistsShouldReturnTrue() {
assertThat(repository.existsById(searchId)).isTrue();
}
@Test
public void givenExample_whenExists_thenIsTrue() {
ExampleMatcher modelMatcher = ExampleMatcher.matching()
.withIgnorePaths("id") // must explicitly ignore -> PK
.withMatcher("model", ignoreCase());
Car probe = new Car();
probe.setModel("bmw");
Example<Car> example = Example.of(probe, modelMatcher);
assertThat(repository.exists(example)).isTrue();
}
@Test
public void givenPower_whenExists_thenIsFalse() {
assertThat(repository.existsCarByPower(200)).isTrue();
assertThat(repository.existsCarByPower(800)).isFalse();
}
@Test
public void existsByDerivedQuery_byModel() {
assertThat(repository.existsCarByModel("Audi")).isTrue();
assertThat(repository.existsCarByModel("audi")).isFalse();
assertThat(repository.existsCarByModel("AUDI")).isFalse();
assertThat(repository.existsCarByModel("")).isFalse();
}
@Test
public void givenModelName_whenExistsExact_thenIsTrue() {
assertThat(repository.existsCarExactCustomQuery("BMW")).isTrue();
assertThat(repository.existsCarExactCustomQuery("Bmw")).isFalse();
assertThat(repository.existsCarExactCustomQuery("bmw")).isFalse();
assertThat(repository.existsCarExactCustomQuery("")).isFalse();
}
@Test
public void givenModelName_whenExistsLike_thenIsTrue() {
assertThat(repository.existsCarLikeCustomQuery("BMW")).isTrue();
assertThat(repository.existsCarLikeCustomQuery("Bmw")).isTrue();
assertThat(repository.existsCarLikeCustomQuery("bmw")).isTrue();
assertThat(repository.existsCarLikeCustomQuery("")).isFalse();
}
}

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package com.baeldung.joins;
import static org.assertj.core.api.Assertions.assertThat;
import com.baeldung.joins.model.Department;
import com.baeldung.joins.model.Phone;
import java.util.Collection;
import java.util.List;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.TypedQuery;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.boot.test.autoconfigure.orm.jpa.DataJpaTest;
import org.springframework.test.context.ActiveProfiles;
import org.springframework.test.context.junit4.SpringRunner;
@RunWith(SpringRunner.class)
@DataJpaTest
@ActiveProfiles("joins")
public class JpaJoinsIntegrationTest {
@PersistenceContext
private EntityManager entityManager;
@Test
public void whenPathExpressionIsUsedForSingleValuedAssociation_thenCreatesImplicitInnerJoin() {
TypedQuery<Department> query = entityManager.createQuery("SELECT e.department FROM Employee e", Department.class);
List<Department> resultList = query.getResultList();
assertThat(resultList).hasSize(3);
assertThat(resultList).extracting("name")
.containsOnly("Infra", "Accounting", "Accounting");
}
@Test
public void whenJoinKeywordIsUsed_thenCreatesExplicitInnerJoin() {
TypedQuery<Department> query = entityManager.createQuery("SELECT d FROM Employee e JOIN e.department d", Department.class);
List<Department> resultList = query.getResultList();
assertThat(resultList).hasSize(3);
assertThat(resultList).extracting("name")
.containsOnly("Infra", "Accounting", "Accounting");
}
@Test
public void whenInnerJoinKeywordIsUsed_thenCreatesExplicitInnerJoin() {
TypedQuery<Department> query = entityManager.createQuery("SELECT d FROM Employee e INNER JOIN e.department d", Department.class);
List<Department> resultList = query.getResultList();
assertThat(resultList).hasSize(3);
assertThat(resultList).extracting("name")
.containsOnly("Infra", "Accounting", "Accounting");
}
@Test
public void whenEntitiesAreListedInFromAndMatchedInWhere_ThenCreatesJoin() {
TypedQuery<Department> query = entityManager.createQuery("SELECT d FROM Employee e, Department d WHERE e.department = d", Department.class);
List<Department> resultList = query.getResultList();
assertThat(resultList).hasSize(3);
assertThat(resultList).extracting("name")
.containsOnly("Infra", "Accounting", "Accounting");
}
@Test
public void whenEntitiesAreListedInFrom_ThenCreatesCartesianProduct() {
TypedQuery<Department> query = entityManager.createQuery("SELECT d FROM Employee e, Department d", Department.class);
List<Department> resultList = query.getResultList();
assertThat(resultList).hasSize(9);
assertThat(resultList).extracting("name")
.containsOnly("Infra", "Accounting", "Management", "Infra", "Accounting", "Management", "Infra", "Accounting", "Management");
}
@Test
public void whenCollectionValuedAssociationIsJoined_ThenCanSelect() {
TypedQuery<Phone> query = entityManager.createQuery("SELECT ph FROM Employee e JOIN e.phones ph WHERE ph LIKE '1%'", Phone.class);
List<Phone> resultList = query.getResultList();
assertThat(resultList).hasSize(1);
}
@Test
public void whenMultipleEntitiesAreListedWithJoin_ThenCreatesMultipleJoins() {
TypedQuery<Phone> query = entityManager.createQuery("SELECT ph FROM Employee e JOIN e.department d JOIN e.phones ph WHERE d.name IS NOT NULL", Phone.class);
List<Phone> resultList = query.getResultList();
assertThat(resultList).hasSize(3);
assertThat(resultList).extracting("number")
.containsOnly("111", "222", "333");
}
@Test
public void whenLeftKeywordIsSpecified_thenCreatesOuterJoinAndIncludesNonMatched() {
TypedQuery<Department> query = entityManager.createQuery("SELECT DISTINCT d FROM Department d LEFT JOIN d.employees e", Department.class);
List<Department> resultList = query.getResultList();
assertThat(resultList).hasSize(3);
assertThat(resultList).extracting("name")
.containsOnly("Infra", "Accounting", "Management");
}
@Test
public void whenFetchKeywordIsSpecified_ThenCreatesFetchJoin() {
TypedQuery<Department> query = entityManager.createQuery("SELECT d FROM Department d JOIN FETCH d.employees", Department.class);
List<Department> resultList = query.getResultList();
assertThat(resultList).hasSize(3);
assertThat(resultList).extracting("name")
.containsOnly("Infra", "Accounting", "Accounting");
}
@Test
public void whenLeftAndFetchKeywordsAreSpecified_ThenCreatesOuterFetchJoin() {
TypedQuery<Department> query = entityManager.createQuery("SELECT d FROM Department d LEFT JOIN FETCH d.employees", Department.class);
List<Department> resultList = query.getResultList();
assertThat(resultList).hasSize(4);
assertThat(resultList).extracting("name")
.containsOnly("Infra", "Accounting", "Accounting", "Management");
}
@Test
public void whenCollectionValuedAssociationIsSpecifiedInSelect_ThenReturnsCollections() {
TypedQuery<Collection> query = entityManager.createQuery("SELECT e.phones FROM Employee e", Collection.class);
List<Collection> resultList = query.getResultList();
assertThat(resultList).extracting("number").containsOnly("111", "222", "333");
}
}

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INSERT INTO Item(id,name) VALUES (1,'Table');
INSERT INTO Item(id,name) VALUES (2,'Bottle');
INSERT INTO Characteristic(id,item_id, type) VALUES (1,1,'Rigid');
INSERT INTO Characteristic(id,item_id,type) VALUES (2,1,'Big');
INSERT INTO Characteristic(id,item_id,type) VALUES (3,2,'Fragile');
INSERT INTO Characteristic(id,item_id,type) VALUES (4,2,'Small');

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DELETE FROM address;
DELETE FROM person;

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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');

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INSERT INTO post (id, title, content) VALUES (1, 'Comment 1', 'Content 1');
INSERT INTO post (id, title, content) VALUES (2, 'Comment 2', 'Content 2');
INSERT INTO post (id, title, content) VALUES (3, 'Comment 3', 'Content 3');
INSERT INTO comment (id, year, approved, content, post_id) VALUES (1, 2019, false, 'Comment 1', 1);
INSERT INTO comment (id, year, approved, content, post_id) VALUES (2, 2018, true, 'Comment 2', 1);
INSERT INTO comment (id, year, approved, content, post_id) VALUES (3, 2018, true, 'Comment 3', 2);
INSERT INTO comment (id, year, approved, content, post_id) VALUES (4, 2017, false, 'Comment 4', 3);

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truncate table fruit;
insert into fruit(id,name,color) values (1,'apple','red');
insert into fruit(id,name,color) values (2,'custard apple','green');
insert into fruit(id,name,color) values (3,'mango','yellow');
insert into fruit(id,name,color) values (4,'guava','green');