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Records as embeddable and DTO
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‎HibernateSpringBootRecordAndEmbeddables/README.md‎

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**[Avoid Spring Redundant `save()` Call](https://github.com/AnghelLeonard/Hibernate-SpringBoot/tree/master/HibernateSpringBootRedundantSave)**
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**Description:** This application is an example when calling `save()` for an entity is redundant (not necessary).
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**Key points:**
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- at flush time, Hibernate relies on *dirty checking* mechanism to determine the potential modifications in entities
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- for each modification, Hibernate automatically triggers the corresponding `UPDATE` statement without the need to explicitly call the `save()` method
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- behind the scene, this redundancy (calling `save()` when is not necessarily) doesn't affect the number of triggered queries, but it implies a performance penalty in the underlying Hibernate processes
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-----------------------------------------------------------------------------------------------------------------------
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<table>
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<tr><td><b>If you need a deep dive into the performance recipes exposed in this repository then I am sure that you will love my book "Spring Boot Persistence Best Practices"</b></td><td><b>If you need a hand of tips and illustrations of 100+ Java persistence performance issues then "Java Persistence Performance Illustrated Guide" is for you.</b></td></tr>
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<tr><td>
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<a href="https://www.apress.com/us/book/9781484256251"><p align="left"><img src="https://github.com/AnghelLeonard/Hibernate-SpringBoot/blob/master/Spring%20Boot%20Persistence%20Best%20Practices.jpg" height="500" width="450"/></p></a>
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</td><td>
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<a href="https://leanpub.com/java-persistence-performance-illustrated-guide"><p align="right"><img src="https://github.com/AnghelLeonard/Hibernate-SpringBoot/blob/master/Java%20Persistence%20Performance%20Illustrated%20Guide.jpg" height="500" width="450"/></p></a>
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</td></tr></table>
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-----------------------------------------------------------------------------------------------------------------------
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‎HibernateSpringBootRecordAndEmbeddables/pom.xml‎

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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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<groupId>com.jpa</groupId>
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<artifactId>HibernateSpringBootRecordAndEmbeddables</artifactId>
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<version>1.0</version>
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<packaging>jar</packaging>
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<name>HibernateSpringBootRecordAndEmbeddables</name>
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<description>JPA project for Spring Boot</description>
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<parent>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-parent</artifactId>
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<version>3.0.2</version>
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<relativePath/> <!-- lookup parent from repository -->
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</parent>
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<properties>
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
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<java.version>19</java.version>
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<maven.compiler.source>19</maven.compiler.source>
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<maven.compiler.target>19</maven.compiler.target>
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</properties>
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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-data-jpa</artifactId>
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<exclusions>
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<exclusion>
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<groupId>org.hibernate</groupId>
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<artifactId>hibernate-entitymanager</artifactId>
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</exclusion>
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<exclusion>
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<groupId>org.hibernate</groupId>
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<artifactId>hibernate-core</artifactId>
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</exclusion>
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</exclusions>
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</dependency>
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<dependency>
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<groupId>org.hibernate.orm</groupId>
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<artifactId>hibernate-core</artifactId>
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<version>6.2.0.CR2</version>
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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-jdbc</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-web</artifactId>
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</dependency>
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<dependency>
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<groupId>com.mysql</groupId>
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<artifactId>mysql-connector-j</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-test</artifactId>
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<scope>test</scope>
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</dependency>
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</dependencies>
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<build>
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<plugins>
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<plugin>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-maven-plugin</artifactId>
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</plugin>
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</plugins>
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</build>
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</project>

‎HibernateSpringBootRecordAndEmbeddables/src/main/java/com/bookstore/MainApplication.java‎

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package com.bookstore;
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import com.bookstore.dto.AuthorDto;
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import java.util.List;
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import com.bookstore.service.BookstoreService;
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import org.springframework.boot.ApplicationRunner;
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import org.springframework.boot.SpringApplication;
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import org.springframework.boot.autoconfigure.SpringBootApplication;
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import org.springframework.context.annotation.Bean;
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@SpringBootApplication
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public class MainApplication {
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private final BookstoreService bookstoreService;
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public MainApplication(BookstoreService bookstoreService) {
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this.bookstoreService = bookstoreService;
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}
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public static void main(String[] args) {
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SpringApplication.run(MainApplication.class, args);
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}
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@Bean
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public ApplicationRunner init() {
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return args -> {
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List<AuthorDto> authors = bookstoreService.fetchByGenre();
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System.out.println(authors);
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};
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}
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}

‎HibernateSpringBootRecordAndEmbeddables/src/main/java/com/bookstore/dto/AuthorDto.java‎

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package com.bookstore.dto;
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import com.bookstore.embeddable.Contact;
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public record AuthorDto(String name, int age, Contact contact) {}

‎HibernateSpringBootRecordAndEmbeddables/src/main/java/com/bookstore/embeddable/Contact.java‎

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package com.bookstore.embeddable;
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import jakarta.persistence.Embeddable;
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@Embeddable
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public record Contact(String email, String twitter, String phone) {}

‎HibernateSpringBootRecordAndEmbeddables/src/main/java/com/bookstore/entity/Author.java‎

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package com.bookstore.entity;
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import com.bookstore.embeddable.Contact;
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import jakarta.persistence.Embedded;
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import jakarta.persistence.Entity;
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import jakarta.persistence.GeneratedValue;
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import jakarta.persistence.GenerationType;
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import jakarta.persistence.Id;
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import java.io.Serializable;
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@Entity
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public class Author implements Serializable {
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private static final long serialVersionUID = 1L;
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@Id
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@GeneratedValue(strategy = GenerationType.IDENTITY)
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private Long id;
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@Embedded
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private Contact contact;
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private int age;
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private String name;
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private String genre;
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public Long getId() {
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return id;
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}
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public void setId(Long id) {
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this.id = id;
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}
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public String getName() {
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return name;
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}
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public void setName(String name) {
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this.name = name;
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}
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public String 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 int getAge() {
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return age;
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}
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public void setAge(int age) {
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this.age = age;
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}
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public Contact getContact() {
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return contact;
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}
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public void setContact(Contact contact) {
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this.contact = contact;
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}
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@Override
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public String toString() {
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return "Author{" + "id=" + id + ", age=" + age
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+ ", name=" + name + ", genre=" + genre + '}';
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}
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}

‎HibernateSpringBootRecordAndEmbeddables/src/main/java/com/bookstore/repository/AuthorRepository.java‎

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package com.bookstore.repository;
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import com.bookstore.dto.AuthorDto;
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import java.util.List;
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import com.bookstore.entity.Author;
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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 org.springframework.transaction.annotation.Transactional;
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@Repository
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public interface AuthorRepository extends JpaRepository<Author, Long> {
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@Transactional(readOnly = true)
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List<AuthorDto> findByGenre(String genre);
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}

‎HibernateSpringBootRecordAndEmbeddables/src/main/java/com/bookstore/service/BookstoreService.java‎

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package com.bookstore.service;
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import com.bookstore.dto.AuthorDto;
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import java.util.List;
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import com.bookstore.repository.AuthorRepository;
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import org.springframework.stereotype.Service;
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@Service
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public class BookstoreService {
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private final AuthorRepository authorRepository;
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public BookstoreService(AuthorRepository authorRepository) {
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this.authorRepository = authorRepository;
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}
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public List<AuthorDto> fetchByGenre() {
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return authorRepository.findByGenre("Anthology");
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}
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}

‎HibernateSpringBootRecordAndEmbeddables/src/main/resources/application.properties‎

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spring.datasource.url=jdbc:mysql://localhost:3306/bookstoredb?createDatabaseIfNotExist=true
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spring.datasource.username=root
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spring.datasource.password=root
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spring.jpa.hibernate.ddl-auto=create
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spring.jpa.show-sql=true
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spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MySQLDialect
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spring.jpa.defer-datasource-initialization=true
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spring.sql.init.mode=always
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spring.jpa.open-in-view=false

‎HibernateSpringBootRecordAndEmbeddables/src/main/resources/data.sql‎

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insert into author (age, name, genre, email, twitter, phone, id) values (23, "Mark Janel", "Anthology", "[email protected]", "@markjanel", "+40198503", 1);
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insert into author (age, name, genre, email, twitter, phone, id) values (43, "Olivia Goy", "Horror", "[email protected]", "@oliviagoy", "+40444933", 2);
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insert into author (age, name, genre, email, twitter, phone, id) values (51, "Quartis Young", "Anthology", "[email protected]", "@quartisyoung", "+40909876", 3);
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insert into author (age, name, genre, email, twitter, phone, id) values (34, "Joana Nimar", "History", "[email protected]", "@joananimar", "+40765433", 4);
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insert into author (age, name, genre, email, twitter, phone, id) values (38, "Alicia Tom", "Anthology", "[email protected]", "@aliciatom", "+40909888", 5);
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insert into author (age, name, genre, email, twitter, phone, id) values (56, "Katy Loin", "Anthology", "[email protected]", "@katyloin", "+40294883", 6);

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