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Arindum Roy
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5bfa01ec05
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### Relevant Articles:
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- [Derived Query Methods in Spring Data JPA Repositories](TBD)
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### Eclipse Config
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After importing the project into Eclipse, you may see the following error:
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"No persistence xml file found in project"
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This can be ignored:
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- Project -> Properties -> Java Persistance -> JPA -> Error/Warnings -> Select Ignore on "No persistence xml file found in project"
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Or:
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- Eclipse -> Preferences - Validation - disable the "Build" execution of the JPA Validator
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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<artifactId>spring-data-jpa-5</artifactId>
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<name>spring-data-jpa-5</name>
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<parent>
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<groupId>com.baeldung</groupId>
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<artifactId>parent-boot-2</artifactId>
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<version>0.0.1-SNAPSHOT</version>
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<relativePath>../../parent-boot-2</relativePath>
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</parent>
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<dependencies>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-web</artifactId>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-data-jpa</artifactId>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-data-jdbc</artifactId>
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</dependency>
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<dependency>
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<groupId>mysql</groupId>
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<artifactId>mysql-connector-java</artifactId>
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</dependency>
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<dependency>
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<groupId>org.postgresql</groupId>
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<artifactId>postgresql</artifactId>
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</dependency>
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<dependency>
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<groupId>com.h2database</groupId>
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<artifactId>h2</artifactId>
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</dependency>
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</dependencies>
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</project>
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package com.baeldung.composite;
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import org.springframework.boot.SpringApplication;
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import org.springframework.boot.autoconfigure.SpringBootApplication;
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@SpringBootApplication
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public class BookApplication {
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public static void main(String[] args) {
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SpringApplication.run(BookApplication.class);
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}
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}
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package com.baeldung.composite.entity;
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import javax.persistence.EmbeddedId;
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import javax.persistence.Entity;
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@Entity
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public class Book {
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@EmbeddedId
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private BookId id;
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private String genre;
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private Integer price;
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public Book() {
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}
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public Book(String author, String name, String genre, Integer price) {
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BookId id = new BookId(author, name);
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this.id = id;
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this.genre = genre;
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this.price = price;
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}
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public BookId getId() {
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return id;
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}
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public void setId(BookId id) {
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this.id = id;
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}
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public String getGenre() {
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return genre;
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}
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public void setGenre(String genre) {
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this.genre = genre;
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}
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public Integer getPrice() {
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return price;
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}
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public void setPrice(Integer price) {
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this.price = price;
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}
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}
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package com.baeldung.composite.entity;
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import javax.persistence.Embeddable;
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import java.io.Serializable;
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import java.util.Objects;
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@Embeddable
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public class BookId implements Serializable {
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private String author;
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private String name;
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public BookId() {
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}
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public BookId(String author, String name) {
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this.author = author;
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this.name = name;
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}
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public String getAuthor() {
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return author;
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}
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public void setAuthor(String author) {
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this.author = author;
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}
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public String getName() {
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return name;
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}
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public void setName(String name) {
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this.name = name;
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}
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@Override
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public boolean equals(Object o) {
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if (this == o)
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return true;
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if (o == null || getClass() != o.getClass())
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return false;
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BookId bookId = (BookId) o;
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return Objects.equals(author, bookId.author) && Objects.equals(name, bookId.name);
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}
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@Override
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public int hashCode() {
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return Objects.hash(author, name);
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}
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}
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package com.baeldung.composite.repository;
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import com.baeldung.composite.entity.Book;
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import com.baeldung.composite.entity.BookId;
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import org.springframework.data.jpa.repository.JpaRepository;
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import org.springframework.stereotype.Repository;
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import java.util.List;
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@Repository
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public interface BookRepository extends JpaRepository<Book, BookId> {
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List<Book> findByIdName(String name);
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List<Book> findByIdAuthor(String author);
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List<Book> findByGenre(String genre);
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}
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@ -0,0 +1,2 @@
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spring.jpa.show-sql=true
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@ -0,0 +1,64 @@
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package com.baeldung.composite.repository;
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import com.baeldung.composite.BookApplication;
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import com.baeldung.composite.entity.Book;
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import org.junit.After;
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import org.junit.Before;
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import org.junit.Test;
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import org.junit.jupiter.api.AfterEach;
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import org.junit.jupiter.api.BeforeEach;
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import org.junit.runner.RunWith;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.boot.test.context.SpringBootTest;
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import org.springframework.test.context.junit4.SpringRunner;
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import java.util.Arrays;
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import java.util.List;
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import static org.junit.Assert.assertEquals;
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@RunWith(SpringRunner.class)
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@SpringBootTest(classes = BookApplication.class)
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public class BookRepositoryIntegrationTest {
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public static final String JAVA_101 = "Java101";
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public static final String JANE = "Jane";
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public static final String TECH = "Tech";
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@Autowired
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BookRepository repository;
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@Before
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public void setUp() {
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Book book1 = new Book("John", JAVA_101, TECH, 20);
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Book book2 = new Book(JANE, JAVA_101, "Arch", 25);
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Book book3 = new Book(JANE, "Scala101", TECH, 23);
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repository.saveAll(Arrays.asList(book1, book2, book3));
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}
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@After
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public void tearDown() {
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repository.deleteAll();
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}
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@Test
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public void testFindByName() {
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List<Book> books = repository.findByIdName(JAVA_101);
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assertEquals(2, books.size());
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}
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@Test
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public void testFindByAuthor() {
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List<Book> books = repository.findByIdAuthor(JANE);
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assertEquals(2, books.size());
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}
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@Test
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public void testFindByGenre() {
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List<Book> books = repository.findByGenre(TECH);
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assertEquals(2, books.size());
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}
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}
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@ -0,0 +1,2 @@
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spring.jpa.hibernate.ddl-auto=update
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spring.datasource.url=jdbc:h2:mem:jpa3
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