adding Association mapping examples

mapping/association-mapping/ExampleApp/.classpath

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+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="src" output="target/classes" path="src/main/java">
+		<attributes>
+			<attribute name="optional" value="true"/>
+			<attribute name="maven.pomderived" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry excluding="**" kind="src" output="target/classes" path="src/main/resources">
+		<attributes>
+			<attribute name="maven.pomderived" value="true"/>
+			<attribute name="optional" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="src" output="target/test-classes" path="src/test/java">
+		<attributes>
+			<attribute name="optional" value="true"/>
+			<attribute name="maven.pomderived" value="true"/>
+			<attribute name="test" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry excluding="**" kind="src" output="target/test-classes" path="src/test/resources">
+		<attributes>
+			<attribute name="maven.pomderived" value="true"/>
+			<attribute name="test" value="true"/>
+			<attribute name="optional" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.8">
+		<attributes>
+			<attribute name="maven.pomderived" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="con" path="org.eclipse.m2e.MAVEN2_CLASSPATH_CONTAINER">
+		<attributes>
+			<attribute name="maven.pomderived" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="output" path="target/classes"/>
+</classpath>

mapping/association-mapping/ExampleApp/.gitignore

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+/target/

mapping/association-mapping/ExampleApp/.project

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+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>ExampleApp</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+		<buildCommand>
+			<name>org.eclipse.m2e.core.maven2Builder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+		<nature>org.eclipse.m2e.core.maven2Nature</nature>
+	</natures>
+</projectDescription>

mapping/association-mapping/ExampleApp/.settings/org.eclipse.core.resources.prefs

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+eclipse.preferences.version=1
+encoding//src/main/java=UTF-8
+encoding//src/test/java=UTF-8
+encoding/<project>=UTF-8

mapping/association-mapping/ExampleApp/.settings/org.eclipse.jdt.core.prefs

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+eclipse.preferences.version=1
+org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.8
+org.eclipse.jdt.core.compiler.compliance=1.8
+org.eclipse.jdt.core.compiler.problem.enablePreviewFeatures=disabled
+org.eclipse.jdt.core.compiler.problem.forbiddenReference=warning
+org.eclipse.jdt.core.compiler.problem.reportPreviewFeatures=ignore
+org.eclipse.jdt.core.compiler.release=disabled
+org.eclipse.jdt.core.compiler.source=1.8

mapping/association-mapping/ExampleApp/.settings/org.eclipse.m2e.core.prefs

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+activeProfiles=
+eclipse.preferences.version=1
+resolveWorkspaceProjects=true
+version=1

mapping/association-mapping/ExampleApp/pom.xml

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+<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.giriharan</groupId>
+  <artifactId>ExampleApp</artifactId>
+  <version>0.0.1-SNAPSHOT</version>
+  <packaging>jar</packaging>
+
+  <name>ExampleApp</name>
+  <url>http://maven.apache.org</url>
+
+  <properties>
+    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+  </properties>
+
+  <dependencies>
+    <dependency>
+      <groupId>junit</groupId>
+      <artifactId>junit</artifactId>
+      <version>3.8.1</version>
+      <scope>test</scope>
+    </dependency>
+    <!-- https://mvnrepository.com/artifact/org.hibernate/hibernate-core -->
+	<dependency>
+	    <groupId>org.hibernate</groupId>
+	    <artifactId>hibernate-core</artifactId>
+	    <version>5.6.15.Final</version>
+	</dependency>
+
+   <!-- https://mvnrepository.com/artifact/com.mysql/mysql-connector-j -->
+	<dependency>
+	    <groupId>com.mysql</groupId>
+	    <artifactId>mysql-connector-j</artifactId>
+	    <version>8.2.0</version>
+	</dependency>
+
+
+  </dependencies>
+</project>

mapping/association-mapping/ExampleApp/src/main/java/com/giriharan/ExampleApp/AppMTM.java

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+package com.giriharan.ExampleApp;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.hibernate.Session;
+import org.hibernate.SessionFactory;
+import org.hibernate.Transaction;
+import org.hibernate.cfg.Configuration;
+
+public class AppMTM {
+	public static void main(String[] args) {
+		Configuration cfg = new Configuration().configure("hibernate.cfg.xml").addAnnotatedClass(Customer.class).addAnnotatedClass(Product.class);
+    	SessionFactory sf = cfg.buildSessionFactory();
+
+    	Session session = sf.openSession();
+    	Transaction transaction = session.beginTransaction();
+
+    	Customer customer1 = new Customer();
+    	List<Customer> customers = new ArrayList<>();
+    	customers.add(customer1);
+
+    	Product product1 = new Product();
+    	Product product2 = new Product();
+    	List<Product> products = new ArrayList<>();
+    	product1.setCustomers(customers);
+    	product2.setCustomers(customers);
+    	customer1.setProducts(products);
+    	products.add(product1);
+    	products.add(product2);
+
+    	/* Before cascading 
+    	session.save(customer1);
+    	session.save(product1);
+    	session.save(product2); */
+
+    	// After cascading
+    	session.save(customer1);
+
+
+    	transaction.commit();
+    	session.close();
+
+    	System.out.println("Successfully added!");
+	}
+
+}

mapping/association-mapping/ExampleApp/src/main/java/com/giriharan/ExampleApp/AppOTM_MTO.java

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+package com.giriharan.ExampleApp;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.hibernate.Session;
+import org.hibernate.SessionFactory;
+import org.hibernate.Transaction;
+import org.hibernate.cfg.Configuration;
+
+public class AppOTM_MTO {
+	public static void main(String args[]) {
+		Configuration cfg = new Configuration().configure("hibernate.cfg.xml").addAnnotatedClass(Library.class).addAnnotatedClass(Book.class);
+    	SessionFactory sf = cfg.buildSessionFactory();
+
+    	Session session = sf.openSession();
+    	Transaction transaction = session.beginTransaction();
+
+    	Library library = new Library();
+    	Book book1 = new Book("God of war : Ragnarok");
+    	Book book2 = new Book("Red Dead Redemption II");
+    	book1.setLibrary(library);
+    	book2.setLibrary(library);
+
+    	List<Book> books = new ArrayList<Book>();
+    	books.add(book1);
+    	books.add(book2);
+
+    	library.setBooks(books);
+
+    	session.save(book1);
+    	session.save(book2);
+    	session.save(library);
+
+    	transaction.commit();
+    	session.close();
+
+    	System.out.println("Successfully added!");
+	}
+
+}

mapping/association-mapping/ExampleApp/src/main/java/com/giriharan/ExampleApp/AppOTO.java

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+package com.giriharan.ExampleApp;
+
+import org.hibernate.Session;
+import org.hibernate.SessionFactory;
+import org.hibernate.Transaction;
+import org.hibernate.cfg.Configuration;
+
+public class AppOTO 
+{
+    public static void main( String[] args )
+    {
+    	Configuration cfg = new Configuration().configure("hibernate.cfg.xml").addAnnotatedClass(Person.class).addAnnotatedClass(Passport.class);
+    	SessionFactory sf = cfg.buildSessionFactory();
+
+    	Session session = sf.openSession();
+    	Transaction transaction = session.beginTransaction();
+
+
+    	Person person = new Person("Arjun");
+    	Passport passport = new Passport();
+    	person.setPassport(passport);
+    	passport.setPerson(person);
+
+    	session.save(person);
+    	session.save(passport);
+
+    	transaction.commit();
+    	session.close();
+
+    	System.out.println("Successfully added!");
+
+    }
+}

mapping/association-mapping/ExampleApp/src/main/java/com/giriharan/ExampleApp/Book.java

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+package com.giriharan.ExampleApp;
+
+import javax.persistence.Column;
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
+import javax.persistence.Id;
+import javax.persistence.ManyToOne;
+
+@Entity
+public class Book {
+	@Id
+	@GeneratedValue(strategy = GenerationType.AUTO)
+	private int id;
+
+	@Column(name="name")
+	private String name;
+
+	@ManyToOne
+	private Library library;
+
+	public Book(String name) {
+		super();
+		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 Library getLibrary() {
+		return library;
+	}
+
+	public void setLibrary(Library library) {
+		this.library = library;
+	}
+
+
+}

mapping/association-mapping/ExampleApp/src/main/java/com/giriharan/ExampleApp/Customer.java

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+package com.giriharan.ExampleApp;
+
+import java.util.List;
+
+import javax.persistence.CascadeType;
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
+import javax.persistence.Id;
+import javax.persistence.JoinColumn;
+import javax.persistence.JoinTable;
+import javax.persistence.ManyToMany;
+
+
+@Entity
+public class Customer {
+	@Id
+	@GeneratedValue(strategy = GenerationType.AUTO)
+	private int id;
+
+	@ManyToMany(cascade = CascadeType.ALL)
+	@JoinTable(joinColumns = @JoinColumn(name="customer_id"), inverseJoinColumns = @JoinColumn(name="product_id"))
+	private List<Product> products;
+
+	public int getId() {
+		return id;
+	}
+
+	public void setId(int id) {
+		this.id = id;
+	}
+
+	public List<Product> getProducts() {
+		return products;
+	}
+
+	public void setProducts(List<Product> products) {
+		this.products = products;
+	}
+
+
+}

mapping/association-mapping/ExampleApp/src/main/java/com/giriharan/ExampleApp/Library.java

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+package com.giriharan.ExampleApp;
+
+import java.util.List;
+
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
+import javax.persistence.Id;
+import javax.persistence.JoinColumn;
+import javax.persistence.JoinTable;
+import javax.persistence.OneToMany;
+
+@Entity
+public class Library {
+	@Id
+	@GeneratedValue(strategy = GenerationType.AUTO)
+	private int id;
+
+	@OneToMany
+	@JoinTable(name = "library_tb_book_tb", joinColumns = @JoinColumn(name = "library_id"),inverseJoinColumns = @JoinColumn(name = "book_id"))
+	private List<Book> books;
+
+	public int getId() {
+		return id;
+	}
+
+	public void setId(int id) {
+		this.id = id;
+	}
+
+	public List<Book> getBooks() {
+		return books;
+	}
+
+	public void setBooks(List<Book> books) {
+		this.books = books;
+	}
+
+
+}