JPA HSQL Many to many extra columns

Author: giaunv

jpa-hibernate-examples/jpa-hibernate-many-to-many-extra-columns-hsql/.gitignore

@@ -0,0 +1,6 @@
+.idea
+*.iml
+target
+*.DS_Store
+.mvn
+mvn*

jpa-hibernate-examples/jpa-hibernate-many-to-many-extra-columns-hsql/pom.xml

@@ -0,0 +1,44 @@
+<?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.hellokoding</groupId>
+	<artifactId>jpa</artifactId>
+	<version>0.0.1-SNAPSHOT</version>
+
+	<name>JPA Many-To-Many with Extra Columns Example</name>
+	<description>JPA Many-To-Many with Extra Columns Example</description>
+
+	<parent>
+		<groupId>org.springframework.boot</groupId>
+		<artifactId>spring-boot-starter-parent</artifactId>
+		<version>2.1.4.RELEASE</version>
+		<relativePath/>
+	</parent>
+
+	<properties>
+		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<java.version>1.7</java.version>
+	</properties>
+
+	<dependencies>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-data-jpa</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>org.hsqldb</groupId>
+			<artifactId>hsqldb</artifactId>
+			<scope>runtime</scope>
+		</dependency>
+	</dependencies>
+	
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.springframework.boot</groupId>
+				<artifactId>spring-boot-maven-plugin</artifactId>
+			</plugin>
+		</plugins>
+	</build>
+</project>

jpa-hibernate-examples/jpa-hibernate-many-to-many-extra-columns-hsql/src/main/java/com/hellokoding/jpa/Application.java

@@ -0,0 +1,59 @@
+package com.hellokoding.jpa;
+
+import com.hellokoding.jpa.model.Book;
+import com.hellokoding.jpa.model.BookPublisher;
+import com.hellokoding.jpa.model.Publisher;
+import com.hellokoding.jpa.repository.BookRepository;
+import com.hellokoding.jpa.repository.PublisherRepository;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.CommandLineRunner;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+import javax.transaction.Transactional;
+import java.util.Date;
+
+@SpringBootApplication
+public class Application implements CommandLineRunner {
+    private static final Logger logger = LoggerFactory.getLogger(Application.class);
+
+    @Autowired
+    private BookRepository bookRepository;
+
+    @Autowired
+    private PublisherRepository publisherRepository;
+
+    public static void main(String[] args) {
+        SpringApplication.run(Application.class, args);
+    }
+
+    @Override
+    @Transactional
+    public void run(String... strings) throws Exception {
+        // create new
+        Book bookA = new Book("Book A");
+        Publisher publisherA = new Publisher("Publisher A");
+
+        BookPublisher bookPublisher = new BookPublisher();
+        bookPublisher.setBook(bookA);
+        bookPublisher.setPublisher(publisherA);
+        bookPublisher.setPublishedDate(new Date());
+
+        bookA.getBookPublishers().add(bookPublisher);
+
+        publisherRepository.save(publisherA);
+        bookRepository.save(bookA);
+
+        // test
+        System.out.println(bookA.getBookPublishers().size());
+
+        // update
+        bookA.getBookPublishers().remove(bookPublisher);
+        bookRepository.save(bookA);
+
+        // test
+        System.out.println(bookA.getBookPublishers().size());
+    }
+}

jpa-hibernate-examples/jpa-hibernate-many-to-many-extra-columns-hsql/src/main/java/com/hellokoding/jpa/model/Book.java

@@ -0,0 +1,49 @@
+package com.hellokoding.jpa.model;
+
+import javax.persistence.*;
+import java.util.HashSet;
+import java.util.Set;
+
+@Entity
+public class Book{
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private int id;
+
+    private String name;
+
+    @OneToMany(mappedBy = "book", cascade = CascadeType.ALL, orphanRemoval = true)
+    private Set<BookPublisher> bookPublishers;
+
+    public Book() {
+    }
+
+    public Book(String name) {
+        this.name = name;
+        bookPublishers = new HashSet<>();
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    public void setId(int id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public Set<BookPublisher>   getBookPublishers() {
+        return bookPublishers;
+    }
+
+    public void setBookPublishers(Set<BookPublisher> bookPublishers) {
+        this.bookPublishers = bookPublishers;
+    }
+}

jpa-hibernate-examples/jpa-hibernate-many-to-many-extra-columns-hsql/src/main/java/com/hellokoding/jpa/model/BookPublisher.java

@@ -0,0 +1,47 @@
+package com.hellokoding.jpa.model;
+
+import javax.persistence.*;
+import java.io.Serializable;
+import java.util.Date;
+
+@Entity
+@Table(name = "book_publisher")
+public class BookPublisher implements Serializable{
+    @Id
+    @ManyToOne
+    @JoinColumn(name = "book_id")
+    private Book book;
+
+    @Id
+    @ManyToOne
+    @JoinColumn(name = "publisher_id")
+    private Publisher publisher;
+
+    @Column(name = "published_date")
+    private Date publishedDate;
+
+    public Book getBook() {
+        return book;
+    }
+
+    public void setBook(Book book) {
+        this.book = book;
+    }
+
+
+    public Publisher getPublisher() {
+        return publisher;
+    }
+
+    public void setPublisher(Publisher publisher) {
+        this.publisher = publisher;
+    }
+
+    public Date getPublishedDate() {
+        return publishedDate;
+    }
+
+    public void setPublishedDate(Date publishedDate) {
+        this.publishedDate = publishedDate;
+    }
+}

jpa-hibernate-examples/jpa-hibernate-many-to-many-extra-columns-hsql/src/main/java/com/hellokoding/jpa/model/Publisher.java

@@ -0,0 +1,48 @@
+package com.hellokoding.jpa.model;
+
+import javax.persistence.*;
+import java.util.Set;
+
+@Entity
+public class Publisher {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private int id;
+
+    private String name;
+
+    @OneToMany(mappedBy = "publisher")
+    private Set<BookPublisher> bookPublishers;
+
+    public Publisher(){
+
+    }
+
+    public Publisher(String name){
+        this.name = name;
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    public void setId(int id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public Set<BookPublisher> getBookPublishers() {
+        return bookPublishers;
+    }
+
+    public void setBookPublishers(Set<BookPublisher> bookPublishers) {
+        this.bookPublishers = bookPublishers;
+    }
+}

jpa-hibernate-examples/jpa-hibernate-many-to-many-extra-columns-hsql/src/main/java/com/hellokoding/jpa/repository/BookRepository.java

@@ -0,0 +1,7 @@
+package com.hellokoding.jpa.repository;
+
+import com.hellokoding.jpa.model.Book;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface BookRepository extends JpaRepository<Book, Integer>{
+}

jpa-hibernate-examples/jpa-hibernate-many-to-many-extra-columns-hsql/src/main/java/com/hellokoding/jpa/repository/PublisherRepository.java

@@ -0,0 +1,7 @@
+package com.hellokoding.jpa.repository;
+
+import com.hellokoding.jpa.model.Publisher;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface PublisherRepository extends JpaRepository<Publisher, Integer> {
+}

jpa-hibernate-examples/jpa-hibernate-many-to-many-extra-columns-hsql/src/main/resources/application.properties

@@ -0,0 +1,2 @@
+spring.jpa.hibernate.ddl-auto=create
+spring.jpa.show-sql=true