Merge branch 'master' into bael-16656

persistence-modules/spring-data-jpa-2/README.md

@@ -0,0 +1,11 @@
+### Relevant Articles: 
+- [Spring Data JPA – Derived Delete Methods](https://www.baeldung.com/spring-data-jpa-deleteby)
+- [JPA Join Types](https://www.baeldung.com/jpa-join-types)
+- [Case Insensitive Queries with Spring Data Repository](https://www.baeldung.com/spring-data-case-insensitive-queries)
+- [The Exists Query in Spring Data](https://www.baeldung.com/spring-data-exists-query)
+- [Spring Data JPA Repository Populators](https://www.baeldung.com/spring-data-jpa-repository-populators)
+- [Spring Data JPA and Null Parameters](https://www.baeldung.com/spring-data-jpa-null-parameters)
+- [Spring Data JPA Projections](https://www.baeldung.com/spring-data-jpa-projections)
+- [JPA @Embedded And @Embeddable](https://www.baeldung.com/jpa-embedded-embeddable)
+- [Spring Data JPA Delete and Relationships](https://www.baeldung.com/spring-data-jpa-delete)
+- [Spring Data JPA and Named Entity Graphs](https://www.baeldung.com/spring-data-jpa-named-entity-graphs)

persistence-modules/spring-data-jpa-2/pom.xml

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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>
+
+    <groupId>com.baeldung</groupId>
+    <artifactId>spring-data-jpa-2</artifactId>
+    <name>spring-data-jpa-2</name>
+
+    <parent>
+        <artifactId>parent-boot-2</artifactId>
+        <groupId>com.baeldung</groupId>
+        <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>

persistence-modules/spring-data-jpa-2/src/main/java/com/baeldung/Application.java

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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);
+    }
+
+}

persistence-modules/spring-data-jpa-2/src/main/java/com/baeldung/config/JpaPopulators.java

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+package com.baeldung.config;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.core.io.ClassPathResource;
+import org.springframework.core.io.Resource;
+import org.springframework.data.repository.init.Jackson2RepositoryPopulatorFactoryBean;
+import org.springframework.data.repository.init.UnmarshallerRepositoryPopulatorFactoryBean;
+import org.springframework.oxm.jaxb.Jaxb2Marshaller;
+
+import com.baeldung.entity.Fruit;
+
+@Configuration
+public class JpaPopulators {
+
+    @Bean
+    public Jackson2RepositoryPopulatorFactoryBean getRespositoryPopulator() throws Exception {
+        Jackson2RepositoryPopulatorFactoryBean factory = new Jackson2RepositoryPopulatorFactoryBean();
+        factory.setResources(new Resource[] { new ClassPathResource("fruit-data.json") });
+        return factory;
+    }
+
+    @Bean
+    public UnmarshallerRepositoryPopulatorFactoryBean repositoryPopulator() {
+
+        Jaxb2Marshaller unmarshaller = new Jaxb2Marshaller();
+        unmarshaller.setClassesToBeBound(Fruit.class);
+
+        UnmarshallerRepositoryPopulatorFactoryBean factory = new UnmarshallerRepositoryPopulatorFactoryBean();
+        factory.setUnmarshaller(unmarshaller);
+        factory.setResources(new Resource[] { new ClassPathResource("apple-fruit-data.xml"), new ClassPathResource("guava-fruit-data.xml") });
+        return factory;
+    }
+
+}

persistence-modules/spring-data-jpa-2/src/main/java/com/baeldung/datajpadelete/entity/Book.java

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+package com.baeldung.datajpadelete.entity;
+
+import javax.persistence.*;
+
+@Entity
+public class Book {
+
+    @Id
+    @GeneratedValue
+    private Long id;
+    private String title;
+
+    @ManyToOne
+    private Category category;
+
+    public Book() {
+    }
+
+    public Book(String title) {
+        this.title = title;
+    }
+
+    public Book(String title, Category category) {
+        this.title = title;
+        this.category = category;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getTitle() {
+        return title;
+    }
+
+    public void setTitle(String title) {
+        this.title = title;
+    }
+
+    public Category getCategory() {
+        return category;
+    }
+
+    public void setCategory(Category category) {
+        this.category = category;
+    }
+}

persistence-modules/spring-data-jpa-2/src/main/java/com/baeldung/datajpadelete/entity/Category.java

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+package com.baeldung.datajpadelete.entity;
+
+import javax.persistence.*;
+import java.util.List;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+@Entity
+public class Category {
+
+    @Id
+    @GeneratedValue
+    private Long id;
+    private String name;
+
+    @OneToMany(mappedBy = "category", cascade = CascadeType.ALL, orphanRemoval = true)
+    private List<Book> books;
+
+    public Category() {
+    }
+
+    public Category(String name) {
+        this.name = name;
+    }
+
+    public Category(String name, Book... books) {
+        this.name = name;
+        this.books = Stream.of(books).collect(Collectors.toList());
+        this.books.forEach(x -> x.setCategory(this));
+    }
+
+    public Category(String name, List<Book> books) {
+        this.name = name;
+        this.books = books;
+    }
+
+    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<Book> getBooks() {
+        return books;
+    }
+
+    public void setBooks(List<Book> books) {
+        this.books = books;
+    }
+}

persistence-modules/spring-data-jpa-2/src/main/java/com/baeldung/datajpadelete/repository/BookRepository.java

@@ -0,0 +1,19 @@
+package com.baeldung.datajpadelete.repository;
+
+import com.baeldung.datajpadelete.entity.Book;
+import org.springframework.data.jpa.repository.Modifying;
+import org.springframework.data.jpa.repository.Query;
+import org.springframework.data.repository.CrudRepository;
+import org.springframework.data.repository.query.Param;
+import org.springframework.stereotype.Repository;
+
+@Repository
+public interface BookRepository extends CrudRepository<Book, Long> {
+
+    long deleteByTitle(String title);
+
+    @Modifying
+    @Query("delete from Book b where b.title=:title")
+    void deleteBooks(@Param("title") String title);
+
+}

persistence-modules/spring-data-jpa-2/src/main/java/com/baeldung/datajpadelete/repository/CategoryRepository.java

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+package com.baeldung.datajpadelete.repository;
+
+import com.baeldung.datajpadelete.entity.Category;
+import org.springframework.data.repository.CrudRepository;
+import org.springframework.stereotype.Repository;
+
+@Repository
+public interface CategoryRepository extends CrudRepository<Category, Long> {
+}

persistence-modules/spring-data-jpa-2/src/main/java/com/baeldung/embeddable/model/Company.java

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+package com.baeldung.embeddable.model;
+
+import javax.persistence.AttributeOverride;
+import javax.persistence.AttributeOverrides;
+import javax.persistence.Column;
+import javax.persistence.Embedded;
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.Id;
+
+@Entity
+public class Company {
+
+    @Id
+    @GeneratedValue
+    private Integer id;
+
+    private String name;
+
+    private String address;
+
+    private String phone;
+
+    @Embedded
+    @AttributeOverrides(value = {
+        @AttributeOverride( name = "firstName", column = @Column(name = "contact_first_name")),
+        @AttributeOverride( name = "lastName", column = @Column(name = "contact_last_name")),
+        @AttributeOverride( name = "phone", column = @Column(name = "contact_phone"))
+    })
+    private ContactPerson contactPerson;
+
+    public Integer getId() {
+        return id;
+    }
+
+    public void setId(Integer id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getAddress() {
+        return address;
+    }
+
+    public void setAddress(String address) {
+        this.address = address;
+    }
+
+    public String getPhone() {
+        return phone;
+    }
+
+    public void setPhone(String phone) {
+        this.phone = phone;
+    }
+
+    public ContactPerson getContactPerson() {
+        return contactPerson;
+    }
+
+    public void setContactPerson(ContactPerson contactPerson) {
+        this.contactPerson = contactPerson;
+    }
+}

persistence-modules/spring-data-jpa-2/src/main/java/com/baeldung/embeddable/model/ContactPerson.java

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+package com.baeldung.embeddable.model;
+
+import javax.persistence.Embeddable;
+
+@Embeddable
+public class ContactPerson {
+
+    private String firstName;
+
+    private String lastName;
+
+    private String phone;
+
+    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 String getPhone() {
+        return phone;
+    }
+
+    public void setPhone(String phone) {
+        this.phone = phone;
+    }
+
+}

persistence-modules/spring-data-jpa-2/src/main/java/com/baeldung/embeddable/repositories/CompanyRepository.java

@@ -0,0 +1,18 @@
+package com.baeldung.embeddable.repositories;
+
+import com.baeldung.embeddable.model.Company;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Query;
+
+import java.util.List;
+
+public interface CompanyRepository extends JpaRepository<Company, Integer> {
+
+    List<Company> findByContactPersonFirstName(String firstName);
+
+    @Query("SELECT C FROM Company C WHERE C.contactPerson.firstName = ?1")
+    List<Company> findByContactPersonFirstNameWithJPQL(String firstName);
+
+    @Query(value = "SELECT * FROM company WHERE contact_first_name = ?1", nativeQuery = true)
+    List<Company> findByContactPersonFirstNameWithNativeQuery(String firstName);
+}

persistence-modules/spring-data-jpa-2/src/main/java/com/baeldung/entity/Customer.java

@@ -0,0 +1,37 @@
+package com.baeldung.entity;
+
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.Id;
+
+@Entity
+public class Customer {
+
+    @Id
+    @GeneratedValue
+    private long id;
+    private String name;
+    private String email;
+
+    public Customer(String name, String email) {
+        this.name = name;
+        this.email = email;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getEmail() {
+        return email;
+    }
+
+    public void setEmail(String email) {
+        this.email = email;
+    }
+
+}

persistence-modules/spring-data-jpa-2/src/main/java/com/baeldung/entity/Fruit.java

@@ -0,0 +1,40 @@
+package com.baeldung.entity;
+
+import javax.persistence.Entity;
+import javax.persistence.Id;
+import javax.xml.bind.annotation.XmlRootElement;
+
+@XmlRootElement
+@Entity
+public class Fruit {
+
+    @Id
+    private long id;
+    private String name;
+    private String color;
+
+    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 String getColor() {
+        return color;
+    }
+
+    public void setColor(String color) {
+        this.color = color;
+    }
+
+}

persistence-modules/spring-data-jpa-2/src/main/java/com/baeldung/entity/Passenger.java

@@ -0,0 +1,78 @@
+package com.baeldung.entity;
+
+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
+public 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;
+
+    private Passenger(String firstName, String lastName) {
+        this.firstName = firstName;
+        this.lastName = lastName;
+    }
+
+    public static Passenger from(String firstName, String lastName) {
+        return new Passenger(firstName, lastName);
+    }
+
+    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;
+    }
+
+    @Override
+    public String toString() {
+        return "Passenger{" + "id=" + id + ", firstName='" + firstName + '\'' + ", lastName='" + lastName + '\'' + '}';
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o)
+            return true;
+        if (o == null || getClass() != o.getClass())
+            return false;
+        Passenger passenger = (Passenger) o;
+        return Objects.equals(firstName, passenger.firstName) && Objects.equals(lastName, passenger.lastName);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(firstName, lastName);
+    }
+}

persistence-modules/spring-data-jpa-2/src/main/java/com/baeldung/entity/Song.java

@@ -0,0 +1,75 @@
+package com.baeldung.entity;
+
+import javax.persistence.Column;
+import javax.persistence.Entity;
+import javax.persistence.Id;
+import java.time.LocalDateTime;
+
+@Entity
+public class Song {
+
+    @Id private long id;
+    private String name;
+    @Column(name = "length_in_seconds")
+    private int lengthInSeconds;
+    private String compositor;
+    private String singer;
+    private LocalDateTime released;
+    private String genre;
+
+    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 getLengthInSeconds() {
+        return lengthInSeconds;
+    }
+
+    public void setLengthInSeconds(int lengthInSeconds) {
+        this.lengthInSeconds = lengthInSeconds;
+    }
+
+    public String getCompositor() {
+        return compositor;
+    }
+
+    public void setCompositor(String compositor) {
+        this.compositor = compositor;
+    }
+
+    public String getSinger() {
+        return singer;
+    }
+
+    public void setSinger(String singer) {
+        this.singer = singer;
+    }
+
+    public LocalDateTime getReleased() {
+        return released;
+    }
+
+    public void setReleased(LocalDateTime released) {
+        this.released = released;
+    }
+
+    public String getGenre() {
+        return genre;
+    }
+
+    public void setGenre(String genre) {
+        this.genre = genre;
+    }
+}

persistence-modules/spring-data-jpa-2/src/main/java/com/baeldung/entitygraph/model/Characteristic.java

@@ -0,0 +1,43 @@
+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;
+    }
+}

persistence-modules/spring-data-jpa-2/src/main/java/com/baeldung/entitygraph/model/Item.java

@@ -0,0 +1,48 @@
+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;
+    }
+}

persistence-modules/spring-data-jpa-2/src/main/java/com/baeldung/entitygraph/repository/CharacteristicsRepository.java

@@ -0,0 +1,13 @@
+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);    
+    
+}

persistence-modules/spring-data-jpa-2/src/main/java/com/baeldung/entitygraph/repository/ItemRepository.java

@@ -0,0 +1,13 @@
+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);
+}

persistence-modules/spring-data-jpa-2/src/main/java/com/baeldung/exists/Car.java

@@ -0,0 +1,48 @@
+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;
+    }
+}

persistence-modules/spring-data-jpa-2/src/main/java/com/baeldung/exists/CarRepository.java

@@ -0,0 +1,24 @@
+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);
+}

persistence-modules/spring-data-jpa-2/src/main/java/com/baeldung/joins/model/Department.java

@@ -0,0 +1,45 @@
+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;
+    }
+}

persistence-modules/spring-data-jpa-2/src/main/java/com/baeldung/joins/model/Employee.java

@@ -0,0 +1,69 @@
+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;
+    }
+}

persistence-modules/spring-data-jpa-2/src/main/java/com/baeldung/joins/model/Phone.java

@@ -0,0 +1,44 @@
+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;
+    }
+}

persistence-modules/spring-data-jpa-2/src/main/java/com/baeldung/projection/model/Address.java

@@ -0,0 +1,57 @@
+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;
+    }
+}

persistence-modules/spring-data-jpa-2/src/main/java/com/baeldung/projection/model/Person.java

@@ -0,0 +1,47 @@
+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;
+    }
+}

persistence-modules/spring-data-jpa-2/src/main/java/com/baeldung/projection/repository/AddressRepository.java

@@ -0,0 +1,11 @@
+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);
+}

persistence-modules/spring-data-jpa-2/src/main/java/com/baeldung/projection/repository/PersonRepository.java

@@ -0,0 +1,14 @@
+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);
+}

persistence-modules/spring-data-jpa-2/src/main/java/com/baeldung/projection/view/AddressView.java

@@ -0,0 +1,7 @@
+package com.baeldung.projection.view;
+
+public interface AddressView {
+    String getZipCode();
+
+    PersonView getPerson();
+}

persistence-modules/spring-data-jpa-2/src/main/java/com/baeldung/projection/view/PersonDto.java

@@ -0,0 +1,34 @@
+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);
+    }
+}

persistence-modules/spring-data-jpa-2/src/main/java/com/baeldung/projection/view/PersonView.java

@@ -0,0 +1,12 @@
+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();
+}

persistence-modules/spring-data-jpa-2/src/main/java/com/baeldung/repository/CustomerRepository.java

@@ -0,0 +1,19 @@
+package com.baeldung.repository;
+
+import com.baeldung.entity.Customer;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Query;
+import org.springframework.data.repository.query.Param;
+
+import java.util.List;
+
+public interface CustomerRepository extends JpaRepository<Customer, Long> {
+
+    List<Customer> findByName(String name);
+
+    List<Customer> findByNameAndEmail(String name, String email);
+
+    @Query("SELECT c FROM Customer c WHERE (:name is null or c.name = :name) and (:email is null or c.email = :email)")
+    List<Customer> findCustomerByNameAndEmail(@Param("name") String name, @Param("email") String email);
+
+}

persistence-modules/spring-data-jpa-2/src/main/java/com/baeldung/repository/FruitRepository.java

@@ -0,0 +1,27 @@
+package com.baeldung.repository;
+
+import java.util.List;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Modifying;
+import org.springframework.data.jpa.repository.Query;
+import org.springframework.data.repository.query.Param;
+import org.springframework.stereotype.Repository;
+
+import com.baeldung.entity.Fruit;
+
+@Repository
+public interface FruitRepository extends JpaRepository<Fruit, Long> {
+
+    Long deleteByName(String name);
+
+    List<Fruit> deleteByColor(String color);
+
+    Long removeByName(String name);
+
+    List<Fruit> removeByColor(String color);
+
+    @Modifying
+    @Query("delete from Fruit f where f.name=:name or f.color=:color")
+    int deleteFruits(@Param("name") String name, @Param("color") String color);
+}

persistence-modules/spring-data-jpa-2/src/main/java/com/baeldung/repository/PassengerRepository.java

@@ -0,0 +1,14 @@
+package com.baeldung.repository;
+
+import com.baeldung.entity.Passenger;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
+
+import java.util.List;
+
+@Repository
+interface PassengerRepository extends JpaRepository<Passenger, Long> {
+
+    List<Passenger> findByFirstNameIgnoreCase(String firstName);
+
+}

persistence-modules/spring-data-jpa-2/src/main/java/com/baeldung/repository/SongRepository.java

@@ -0,0 +1,21 @@
+package com.baeldung.repository;
+
+import com.baeldung.entity.Song;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
+
+import java.util.List;
+
+@Repository
+public interface SongRepository extends JpaRepository<Song, Long> {
+
+    List<Song> findByNameLike(String name);
+
+    List<Song> findByNameNotLike(String name);
+
+    List<Song> findByNameStartingWith(String startingWith);
+
+    List<Song> findByNameEndingWith(String endingWith);
+
+    List<Song> findBySingerContaining(String singer);
+}

persistence-modules/spring-data-jpa-2/src/main/resources/apple-fruit-data.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<fruit>
+    <id>1</id>
+    <name>apple</name>
+    <color>red</color>
+</fruit>

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

@@ -0,0 +1 @@
+spring.datasource.data=classpath:db/import_joins.sql

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

@@ -0,0 +1 @@
+spring.jpa.show-sql=true

persistence-modules/spring-data-jpa-2/src/main/resources/db/import_joins.sql

@@ -0,0 +1,13 @@
+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;

persistence-modules/spring-data-jpa-2/src/main/resources/fruit-data.json

@@ -0,0 +1,14 @@
+[
+    {
+        "_class": "com.baeldung.entity.Fruit",
+        "name": "apple",
+        "color": "red",
+        "id": 1
+    },
+    {
+        "_class": "com.baeldung.entity.Fruit",
+        "name": "guava",
+        "color": "green",
+        "id": 2
+    }
+]

persistence-modules/spring-data-jpa-2/src/main/resources/guava-fruit-data.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<fruit>
+    <id>2</id>
+    <name>guava</name>
+    <color>green</color>
+</fruit>

persistence-modules/spring-data-jpa-2/src/test/java/com/baeldung/datajpadelete/DeleteFromRepositoryUnitTest.java

@@ -0,0 +1,72 @@
+package com.baeldung.datajpadelete;
+
+import com.baeldung.Application;
+import com.baeldung.datajpadelete.entity.Book;
+import com.baeldung.datajpadelete.repository.BookRepository;
+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.test.context.junit4.SpringRunner;
+import org.springframework.transaction.annotation.Transactional;
+
+import java.util.Arrays;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest(classes = {Application.class})
+public class DeleteFromRepositoryUnitTest {
+
+    @Autowired
+    private BookRepository repository;
+
+    Book book1;
+    Book book2;
+
+    @Before
+    public void setup() {
+        book1 = new Book("The Hobbit");
+        book2 = new Book("All Quiet on the Western Front");
+
+        repository.saveAll(Arrays.asList(book1, book2));
+    }
+
+    @After
+    public void teardown() {
+        repository.deleteAll();
+    }
+
+    @Test
+    public void whenDeleteByIdFromRepository_thenDeletingShouldBeSuccessful() {
+        repository.deleteById(book1.getId());
+
+        assertThat(repository.count()).isEqualTo(1);
+    }
+
+    @Test
+    public void whenDeleteAllFromRepository_thenRepositoryShouldBeEmpty() {
+        repository.deleteAll();
+
+        assertThat(repository.count()).isEqualTo(0);
+    }
+
+    @Test
+    @Transactional
+    public void whenDeleteFromDerivedQuery_thenDeletingShouldBeSuccessful() {
+        long deletedRecords = repository.deleteByTitle("The Hobbit");
+
+        assertThat(deletedRecords).isEqualTo(1);
+    }
+
+    @Test
+    @Transactional
+    public void whenDeleteFromCustomQuery_thenDeletingShouldBeSuccessful() {
+        repository.deleteBooks("The Hobbit");
+
+        assertThat(repository.count()).isEqualTo(1);
+    }
+
+}

persistence-modules/spring-data-jpa-2/src/test/java/com/baeldung/datajpadelete/DeleteInRelationshipsUnitTest.java

@@ -0,0 +1,60 @@
+package com.baeldung.datajpadelete;
+
+import com.baeldung.Application;
+import com.baeldung.datajpadelete.entity.Book;
+import com.baeldung.datajpadelete.entity.Category;
+import com.baeldung.datajpadelete.repository.BookRepository;
+import com.baeldung.datajpadelete.repository.CategoryRepository;
+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.test.context.junit4.SpringRunner;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest(classes = {Application.class})
+public class DeleteInRelationshipsUnitTest {
+
+    @Autowired
+    private BookRepository bookRepository;
+
+    @Autowired
+    private CategoryRepository categoryRepository;
+
+    @Before
+    public void setup() {
+        Book book1 = new Book("The Hobbit");
+        Category category1 = new Category("Cat1", book1);
+        categoryRepository.save(category1);
+
+        Book book2 = new Book("All Quiet on the Western Front");
+        Category category2 = new Category("Cat2", book2);
+        categoryRepository.save(category2);
+    }
+
+    @After
+    public void teardown() {
+        bookRepository.deleteAll();
+        categoryRepository.deleteAll();
+    }
+
+    @Test
+    public void whenDeletingCategories_thenBooksShouldAlsoBeDeleted() {
+        categoryRepository.deleteAll();
+
+        assertThat(bookRepository.count()).isEqualTo(0);
+        assertThat(categoryRepository.count()).isEqualTo(0);
+    }
+
+    @Test
+    public void whenDeletingBooks_thenCategoriesShouldAlsoBeDeleted() {
+        bookRepository.deleteAll();
+
+        assertThat(bookRepository.count()).isEqualTo(0);
+        assertThat(categoryRepository.count()).isEqualTo(2);
+    }
+}

persistence-modules/spring-data-jpa-2/src/test/java/com/baeldung/embeddable/EmbeddableIntegrationTest.java

@@ -0,0 +1,125 @@
+package com.baeldung.embeddable;
+
+import com.baeldung.Application;
+import com.baeldung.embeddable.model.Company;
+import com.baeldung.embeddable.model.ContactPerson;
+import com.baeldung.embeddable.repositories.CompanyRepository;
+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.test.context.junit4.SpringRunner;
+import org.springframework.transaction.annotation.Transactional;
+
+import java.util.List;
+
+import static org.junit.Assert.assertEquals;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest(classes = {Application.class})
+public class EmbeddableIntegrationTest {
+
+    @Autowired
+    private CompanyRepository companyRepository;
+
+    @Test
+    @Transactional
+    public void whenInsertingCompany_thenEmbeddedContactPersonDetailsAreMapped() {
+        ContactPerson contactPerson = new ContactPerson();
+        contactPerson.setFirstName("First");
+        contactPerson.setLastName("Last");
+        contactPerson.setPhone("123-456-789");
+
+        Company company = new Company();
+        company.setName("Company");
+        company.setAddress("1st street");
+        company.setPhone("987-654-321");
+        company.setContactPerson(contactPerson);
+
+        companyRepository.save(company);
+
+        Company result = companyRepository.getOne(company.getId());
+
+        assertEquals("Company", result.getName());
+        assertEquals("1st street", result.getAddress());
+        assertEquals("987-654-321", result.getPhone());
+        assertEquals("First", result.getContactPerson().getFirstName());
+        assertEquals("Last", result.getContactPerson().getLastName());
+        assertEquals("123-456-789", result.getContactPerson().getPhone());
+    }
+
+    @Test
+    @Transactional
+    public void whenFindingCompanyByContactPersonAttribute_thenCompanyIsReturnedProperly() {
+        ContactPerson contactPerson = new ContactPerson();
+        contactPerson.setFirstName("Name");
+        contactPerson.setLastName("Last");
+        contactPerson.setPhone("123-456-789");
+
+        Company company = new Company();
+        company.setName("Company");
+        company.setAddress("1st street");
+        company.setPhone("987-654-321");
+        company.setContactPerson(contactPerson);
+
+        companyRepository.save(company);
+
+        List<Company> result = companyRepository.findByContactPersonFirstName("Name");
+
+        assertEquals(1, result.size());
+
+        result = companyRepository.findByContactPersonFirstName("FirstName");
+
+        assertEquals(0, result.size());
+    }
+
+    @Test
+    @Transactional
+    public void whenFindingCompanyByContactPersonAttributeWithJPQL_thenCompanyIsReturnedProperly() {
+        ContactPerson contactPerson = new ContactPerson();
+        contactPerson.setFirstName("@QueryName");
+        contactPerson.setLastName("Last");
+        contactPerson.setPhone("123-456-789");
+
+        Company company = new Company();
+        company.setName("Company");
+        company.setAddress("1st street");
+        company.setPhone("987-654-321");
+        company.setContactPerson(contactPerson);
+
+        companyRepository.save(company);
+
+        List<Company> result = companyRepository.findByContactPersonFirstNameWithJPQL("@QueryName");
+
+        assertEquals(1, result.size());
+
+        result = companyRepository.findByContactPersonFirstNameWithJPQL("FirstName");
+
+        assertEquals(0, result.size());
+    }
+
+    @Test
+    @Transactional
+    public void whenFindingCompanyByContactPersonAttributeWithNativeQuery_thenCompanyIsReturnedProperly() {
+        ContactPerson contactPerson = new ContactPerson();
+        contactPerson.setFirstName("NativeQueryName");
+        contactPerson.setLastName("Last");
+        contactPerson.setPhone("123-456-789");
+
+        Company company = new Company();
+        company.setName("Company");
+        company.setAddress("1st street");
+        company.setPhone("987-654-321");
+        company.setContactPerson(contactPerson);
+
+        companyRepository.save(company);
+
+        List<Company> result = companyRepository.findByContactPersonFirstNameWithNativeQuery("NativeQueryName");
+
+        assertEquals(1, result.size());
+
+        result = companyRepository.findByContactPersonFirstNameWithNativeQuery("FirstName");
+
+        assertEquals(0, result.size());
+    }
+}

persistence-modules/spring-data-jpa-2/src/test/java/com/baeldung/entitygraph/EntityGraphIntegrationTest.java

@@ -0,0 +1,39 @@
+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);
+    }
+}

persistence-modules/spring-data-jpa-2/src/test/java/com/baeldung/exists/CarRepositoryIntegrationTest.java

@@ -0,0 +1,87 @@
+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();
+    }
+
+}

persistence-modules/spring-data-jpa-2/src/test/java/com/baeldung/joins/JpaJoinsIntegrationTest.java

@@ -0,0 +1,142 @@
+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");
+    }
+}

persistence-modules/spring-data-jpa-2/src/test/java/com/baeldung/projection/JpaProjectionIntegrationTest.java

@@ -0,0 +1,63 @@
+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");
+    }
+}

persistence-modules/spring-data-jpa-2/src/test/java/com/baeldung/repository/CustomerRepositoryIntegrationTest.java

@@ -0,0 +1,64 @@
+package com.baeldung.repository;
+
+import com.baeldung.entity.Customer;
+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.autoconfigure.orm.jpa.DataJpaTest;
+import org.springframework.test.context.junit4.SpringRunner;
+
+import javax.persistence.EntityManager;
+import javax.persistence.PersistenceContext;
+import java.util.List;
+
+import static org.junit.Assert.assertEquals;
+
+@DataJpaTest
+@RunWith(SpringRunner.class)
+public class CustomerRepositoryIntegrationTest {
+
+    @PersistenceContext
+    private EntityManager entityManager;
+
+    @Autowired
+    private CustomerRepository repository;
+
+    @Before
+    public void before() {
+        entityManager.persist(new Customer("A", "A@example.com"));
+        entityManager.persist(new Customer("D", null));
+        entityManager.persist(new Customer("D", "D@example.com"));
+    }
+
+    @Test
+    public void givenQueryMethod_whenEmailIsNull_thenFoundByNullEmail() {
+        List<Customer> customers = repository.findByNameAndEmail("D", null);
+
+        assertEquals(1, customers.size());
+        Customer actual = customers.get(0);
+
+        assertEquals(null, actual.getEmail());
+        assertEquals("D", actual.getName());
+    }
+
+    @Test
+    public void givenQueryMethod_whenEmailIsAbsent_thenIgnoreEmail() {
+        List<Customer> customers = repository.findByName("D");
+
+        assertEquals(2, customers.size());
+    }
+
+    @Test
+    public void givenQueryAnnotation_whenEmailIsNull_thenIgnoreEmail() {
+        List<Customer> customers = repository.findCustomerByNameAndEmail("D", null);
+
+        assertEquals(2, customers.size());
+    }
+
+    @After
+    public void cleanUp() {
+        repository.deleteAll();
+    }
+}

persistence-modules/spring-data-jpa-2/src/test/java/com/baeldung/repository/FruitPopulatorIntegrationTest.java

@@ -0,0 +1,38 @@
+package com.baeldung.repository;
+
+import static org.junit.Assert.assertEquals;
+
+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.context.SpringBootTest;
+import org.springframework.test.context.junit4.SpringRunner;
+
+import com.baeldung.entity.Fruit;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest
+public class FruitPopulatorIntegrationTest {
+
+    @Autowired
+    private FruitRepository fruitRepository;
+
+    @Test
+    public void givenFruitJsonPopulatorThenShouldInsertRecordOnStart() {
+
+        List<Fruit> fruits = fruitRepository.findAll();
+        assertEquals("record count is not matching", 2, fruits.size());
+
+        fruits.forEach(fruit -> {
+            if (1 == fruit.getId()) {
+                assertEquals("apple", fruit.getName());
+                assertEquals("red", fruit.getColor());
+            } else if (2 == fruit.getId()) {
+                assertEquals("guava", fruit.getName());
+                assertEquals("green", fruit.getColor());
+            }
+        });
+    }
+}

persistence-modules/spring-data-jpa-2/src/test/java/com/baeldung/repository/FruitRepositoryIntegrationTest.java

@@ -0,0 +1,75 @@
+package com.baeldung.repository;
+
+import static org.junit.Assert.assertEquals;
+
+import java.util.List;
+
+import org.junit.jupiter.api.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.jdbc.Sql;
+import org.springframework.test.context.junit4.SpringRunner;
+import org.springframework.transaction.annotation.Transactional;
+
+import com.baeldung.entity.Fruit;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest
+class FruitRepositoryIntegrationTest {
+
+    @Autowired
+    private FruitRepository fruitRepository;
+
+    @Transactional
+    @Test
+    @Sql(scripts = { "/test-fruit-data.sql" })
+    public void givenFruits_WhenDeletedByColor_ThenDeletedFruitsShouldReturn() {
+
+        List<Fruit> fruits = fruitRepository.deleteByColor("green");
+
+        assertEquals("number of fruits are not matching", 2, fruits.size());
+        fruits.forEach(fruit -> assertEquals("Its not a green fruit", "green", fruit.getColor()));
+    }
+
+    @Transactional
+    @Test
+    @Sql(scripts = { "/test-fruit-data.sql" })
+    public void givenFruits_WhenDeletedByName_ThenDeletedFruitCountShouldReturn() {
+
+        Long deletedFruitCount = fruitRepository.deleteByName("apple");
+
+        assertEquals("deleted fruit count is not matching", 1, deletedFruitCount.intValue());
+    }
+
+    @Transactional
+    @Test
+    @Sql(scripts = { "/test-fruit-data.sql" })
+    public void givenFruits_WhenRemovedByColor_ThenDeletedFruitsShouldReturn() {
+
+        List<Fruit> fruits = fruitRepository.removeByColor("green");
+
+        assertEquals("number of fruits are not matching", 2, fruits.size());
+        fruits.forEach(fruit -> assertEquals("Its not a green fruit", "green", fruit.getColor()));
+    }
+
+    @Transactional
+    @Test
+    @Sql(scripts = { "/test-fruit-data.sql" })
+    public void givenFruits_WhenRemovedByName_ThenDeletedFruitCountShouldReturn() {
+
+        Long deletedFruitCount = fruitRepository.removeByName("apple");
+
+        assertEquals("deleted fruit count is not matching", 1, deletedFruitCount.intValue());
+    }
+
+    @Transactional
+    @Test
+    @Sql(scripts = { "/test-fruit-data.sql" })
+    public void givenFruits_WhenDeletedByColorOrName_ThenDeletedFruitsShouldReturn() {
+
+        int deletedCount = fruitRepository.deleteFruits("apple", "green");
+
+        assertEquals("number of fruits are not matching", 3, deletedCount);
+    }
+}

persistence-modules/spring-data-jpa-2/src/test/java/com/baeldung/repository/PassengerRepositoryIntegrationTest.java

@@ -0,0 +1,54 @@
+package com.baeldung.repository;
+
+import com.baeldung.entity.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.test.context.junit4.SpringRunner;
+
+import javax.persistence.EntityManager;
+import javax.persistence.PersistenceContext;
+import java.util.List;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.contains;
+import static org.hamcrest.core.IsNot.not;
+
+@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"));
+        entityManager.persist(Passenger.from("Eve", "Jackson"));
+        entityManager.persist(Passenger.from("Fred", "Bloggs"));
+        entityManager.persist(Passenger.from("Ricki", "Bobbie"));
+        entityManager.persist(Passenger.from("Siya", "Kolisi"));
+    }
+
+    @Test
+    public void givenPassengers_whenMatchingIgnoreCase_thenExpectedReturned() {
+        Passenger jill = Passenger.from("Jill", "Smith");
+        Passenger eve = Passenger.from("Eve", "Jackson");
+        Passenger fred = Passenger.from("Fred", "Bloggs");
+        Passenger siya = Passenger.from("Siya", "Kolisi");
+        Passenger ricki = Passenger.from("Ricki", "Bobbie");
+
+        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)));
+
+    }
+}

persistence-modules/spring-data-jpa-2/src/test/java/com/baeldung/repository/SongRepositoryIntegrationTest.java

@@ -0,0 +1,58 @@
+package com.baeldung.repository;
+
+import static org.junit.Assert.assertEquals;
+
+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.context.SpringBootTest;
+import org.springframework.test.context.jdbc.Sql;
+import org.springframework.test.context.junit4.SpringRunner;
+import org.springframework.transaction.annotation.Transactional;
+
+import com.baeldung.entity.Song;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest
+@Sql(scripts = { "/test-song-data.sql" })
+public class SongRepositoryIntegrationTest {
+
+    @Autowired private SongRepository songRepository;
+
+    @Transactional
+    @Test
+    public void givenSong_WhenFindLikeByName_ThenShouldReturnOne() {
+        List<Song> songs = songRepository.findByNameLike("Despacito");
+        assertEquals(1, songs.size());
+    }
+
+    @Transactional
+    @Test
+    public void givenSong_WhenFindByNameNotLike_thenShouldReturn3Songs() {
+        List<Song> songs = songRepository.findByNameNotLike("Despacito");
+        assertEquals(5, songs.size());
+    }
+
+    @Transactional
+    @Test
+    public void givenSong_WhenFindByNameStartingWith_thenShouldReturn2Songs() {
+        List<Song> songs = songRepository.findByNameStartingWith("Co");
+        assertEquals(2, songs.size());
+    }
+
+    @Transactional
+    @Test
+    public void givenSong_WhenFindByNameEndingWith_thenShouldReturn2Songs() {
+        List<Song> songs = songRepository.findByNameEndingWith("Life");
+        assertEquals(2, songs.size());
+    }
+
+    @Transactional
+    @Test
+    public void givenSong_WhenFindBySingerContaining_thenShouldReturn2Songs() {
+        List<Song> songs = songRepository.findBySingerContaining("Luis");
+        assertEquals(2, songs.size());
+    }
+}

persistence-modules/spring-data-jpa-2/src/test/resources/entitygraph-data.sql

@@ -0,0 +1,7 @@
+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');

persistence-modules/spring-data-jpa-2/src/test/resources/projection-clean-up-data.sql

@@ -0,0 +1,2 @@
+DELETE FROM address;
+DELETE FROM person;

persistence-modules/spring-data-jpa-2/src/test/resources/projection-insert-data.sql

@@ -0,0 +1,2 @@
+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');

persistence-modules/spring-data-jpa-2/src/test/resources/test-fruit-data.sql

@@ -0,0 +1,6 @@
+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');

persistence-modules/spring-data-jpa-2/src/test/resources/test-song-data.sql

@@ -0,0 +1,8 @@
+INSERT INTO song(id,name,length_in_seconds,compositor,singer,released,genre)
+VALUES
+(1,'Despacito',209,'Luis Fonsi','Luis Fonsi, Daddy Yankee','2017-01-12','Reggaeton'),
+(2,'Con calma',188,'Daddy Yankee','Daddy Yankee','2019-01-24','Reggaeton'),
+(3,'It''s My Life',205,'Bon Jovi','Jon Bon Jovi','2000-05-23','Pop'),
+(4,'Live is Life',242,'Opus','Opus','1985-01-01','Reggae'),
+(5,'Countdown to Extinction',249,'Megadeth','Megadeth','1992-07-14','Heavy Metal'),
+(6, 'Si nos dejan',139,'Luis Miguel','Luis Miguel','1995-10-17','Bolero');