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Vitalii
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example of using ORM EclipseLink
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‎EclipseLinkExample/WebContent/META-INF/MANIFEST.MF‎

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Manifest-Version: 1.0
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Class-Path:
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‎EclipseLinkExample/WebContent/WEB-INF/web.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<web-app id="WebApp_ID" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
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<display-name>EclipseLinkExample</display-name>
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<servlet>
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<description>
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</description>
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<display-name>main</display-name>
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<servlet-name>main</servlet-name>
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<servlet-class>
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web.main</servlet-class>
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</servlet>
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<servlet-mapping>
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<servlet-name>main</servlet-name>
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<url-pattern>/main</url-pattern>
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</servlet-mapping>
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<welcome-file-list>
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<welcome-file>index.html</welcome-file>
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<welcome-file>index.htm</welcome-file>
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<welcome-file>index.jsp</welcome-file>
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<welcome-file>default.html</welcome-file>
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<welcome-file>default.htm</welcome-file>
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<welcome-file>default.jsp</welcome-file>
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</welcome-file-list>
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</web-app>

‎EclipseLinkExample/src/META-INF/persistence.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<persistence version="1.0"
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xmlns="http://java.sun.com/xml/ns/persistence"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd">
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<persistence-unit name="entity_example">
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<provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
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<class>example.eclipselink.ExampleEntity</class>
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<properties>
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<property name="eclipselink.jdbc.driver" value="org.firebirdsql.jdbc.FBDriver" />
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<property name="eclipselink.jdbc.url" value="jdbc:firebirdsql://localhost:3050/d:/jpa_example.gdb?sql_dialect=3" />
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<!-- I work in this example without user / password.-->
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<property name="eclipselink.jdbc.user" value="SYSDBA" />
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<property name="eclipselink.jdbc.password" value="masterkey" />
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<!-- EclipseLink should create the database schema automatically -->
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<!-- property name="eclipselink.ddl-generation" value="drop-and-create-tables" / -->
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<property name="eclipselink.ddl-generation.output-mode" value="database" />
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</properties>
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</persistence-unit>
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</persistence>

‎EclipseLinkExample/src/example/eclipselink/ExampleEntity.java‎

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package example.eclipselink;
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import java.io.Serializable;
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import javax.persistence.*;
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@Entity
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public class ExampleEntity implements Serializable{
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private final static long serialVersionUID=1L;
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@Id
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private int id;
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@Transient
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private int tempValue;
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private String name;
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private String description;
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public int getId() {
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return id;
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}
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public void setId(int id) {
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this.id = id;
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}
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public int getTempValue() {
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return tempValue;
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}
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public void setTempValue(int tempValue) {
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this.tempValue = tempValue;
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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 getDescription() {
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return description;
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}
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public void setDescription(String description) {
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this.description = description;
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}
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}

‎EclipseLinkExample/src/example/eclipselink/Main.java‎

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package example.eclipselink;
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import java.util.HashMap;
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import javax.persistence.EntityManager;
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import javax.persistence.EntityManagerFactory;
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import javax.persistence.Persistence;
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import javax.persistence.Query;
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public class Main {
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public static void main(String[] args){
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System.out.println("begin");
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Main main=new Main();
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System.out.println("-end-");
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}
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private static final String PERSISTENCE_UNIT_NAME = "entity_example";
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private EntityManagerFactory factory;
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public Main(){
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factory = Persistence.createEntityManagerFactory(PERSISTENCE_UNIT_NAME, new HashMap());
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// PersistenceUnitProperties.JDBC_DRIVER
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EntityManager em = factory.createEntityManager();
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em.getTransaction().begin();
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Query q = em.createQuery("select m from ExampleEntity m");
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em.close();
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factory.close();
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}
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/** ïðèìåð çàïèñè îáúåêòà ÷åðåç JPA */
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private void write(ExampleEntity example){
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}
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/** ïðèìåð ÷òåíèÿ îáúåêòà ÷åðåç JPA */
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private ExampleEntity read(int key){
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return null;
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}
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}

‎EclipseLinkExample/src/web/main.java‎

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package web;
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import java.io.IOException;
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import java.util.HashMap;
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import java.util.List;
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import javax.persistence.EntityManager;
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import javax.persistence.EntityManagerFactory;
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import javax.persistence.Persistence;
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import javax.persistence.Query;
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import javax.servlet.ServletException;
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import javax.servlet.ServletOutputStream;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import example.eclipselink.ExampleEntity;
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/**
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* Servlet implementation class main
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*/
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public class main extends HttpServlet {
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private static final long serialVersionUID = 1L;
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private static final String PERSISTENCE_UNIT_NAME = "entity_example";
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private EntityManagerFactory factory= null;
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/**
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* @see HttpServlet#HttpServlet()
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*/
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public main() {
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super();
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}
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@Override
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public void init() throws ServletException {
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super.init();
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try{
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factory= Persistence.createEntityManagerFactory(PERSISTENCE_UNIT_NAME, new HashMap());
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}catch(Exception ex){
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System.err.println("ERROR: "+ex.getMessage());
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ex.printStackTrace(System.err);
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};
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}
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/**
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* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
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*/
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protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
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doProcess(request, response);
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}
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/**
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* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
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*/
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protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
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doProcess(request, response);
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}
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private void doProcess(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
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ServletOutputStream out=response.getOutputStream();
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out.println("<html>");
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out.println("<body>");
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// PersistenceUnitProperties.JDBC_DRIVER
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if(factory==null){
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factory= Persistence.createEntityManagerFactory(PERSISTENCE_UNIT_NAME, new HashMap());
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}
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EntityManager em = factory.createEntityManager();
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em.getTransaction().begin();
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Query q = em.createQuery("select m from ExampleEntity m");
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if(q.getResultList().size()==0){
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// create object
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out.println("<b> create object begin </b>");
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ExampleEntity example=new ExampleEntity();
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example.setId(3);
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example.setName("Test1");
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example.setDescription("this is temp Entity");
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example.setTempValue(1);
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em.persist(example);
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out.println("<br>");
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out.println("<b>create object DONE </b>");
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}else{
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// output object
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List list=q.getResultList();
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for(int counter=0;counter<list.size();counter++){
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out.println(counter+" : "+list.get(counter).getClass().getName());
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out.println("<br>");
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}
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}
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em.getTransaction().commit();
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out.println("DONE");
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out.println("</body></html>");
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}
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}

‎EclipseLink_Example/persistence.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<persistence version="1.0"
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xmlns="http://java.sun.com/xml/ns/persistence"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd">
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<persistence-unit name="entity_example">
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<provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
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<class>example.eclipselink.ExampleEntity</class>
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<properties>
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<property name="eclipselink.jdbc.driver" value="org.firebirdsql.jdbc.FBDriver" />
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<property name="eclipselink.jdbc.url" value="jdbc:firebirdsql://localhost:3050/d:/jpa_example.gdb?sql_dialect=3" />
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<!-- I work in this example without user / password.-->
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<property name="eclipselink.jdbc.user" value="SYSDBA" />
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<property name="eclipselink.jdbc.password" value="masterkey" />
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<!-- EclipseLink should create the database schema automatically -->
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<property name="eclipselink.ddl-generation" value="drop-and-create-tables" />
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<property name="eclipselink.ddl-generation.output-mode" value="database" />
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</properties>
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</persistence-unit>
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</persistence>

‎EclipseLink_Example/src/META-INF/persistence.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<persistence version="1.0"
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xmlns="http://java.sun.com/xml/ns/persistence"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd">
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<persistence-unit name="entity_example">
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<provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
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<class>example.eclipselink.ExampleEntity</class>
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<properties>
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<property name="eclipselink.jdbc.driver" value="org.firebirdsql.jdbc.FBDriver" />
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<property name="eclipselink.jdbc.url" value="jdbc:firebirdsql://localhost:3050/d:/jpa_example.gdb?sql_dialect=3" />
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<!-- I work in this example without user / password.-->
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<property name="eclipselink.jdbc.user" value="SYSDBA" />
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<property name="eclipselink.jdbc.password" value="masterkey" />
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<!-- EclipseLink should create the database schema automatically -->
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<!-- property name="eclipselink.ddl-generation" value="drop-and-create-tables" / -->
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<property name="eclipselink.ddl-generation.output-mode" value="database" />
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</properties>
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</persistence-unit>
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</persistence>

‎EclipseLink_Example/src/example/eclipselink/ExampleEntity.java‎

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package example.eclipselink;
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import java.io.Serializable;
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import javax.persistence.*;
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@Entity
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public class ExampleEntity implements Serializable{
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private final static long serialVersionUID=1L;
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@Id
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private int id;
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@Transient
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private int tempValue;
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private String name;
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private String description;
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public int getId() {
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return id;
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}
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public void setId(int id) {
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this.id = id;
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}
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public int getTempValue() {
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return tempValue;
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}
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public void setTempValue(int tempValue) {
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this.tempValue = tempValue;
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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 getDescription() {
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return description;
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}
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public void setDescription(String description) {
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this.description = description;
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}
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}

‎EclipseLink_Example/src/example/eclipselink/Main.java‎

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package example.eclipselink;
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import java.util.HashMap;
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import java.util.List;
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import javax.persistence.EntityManager;
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import javax.persistence.EntityManagerFactory;
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import javax.persistence.Persistence;
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import javax.persistence.Query;
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public class Main {
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public static void main(String[] args){
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System.out.println("begin");
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Main main=new Main();
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System.out.println("-end-");
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}
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private static final String PERSISTENCE_UNIT_NAME = "entity_example";
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private EntityManagerFactory factory;
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public Main(){
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factory = Persistence.createEntityManagerFactory(PERSISTENCE_UNIT_NAME, new HashMap());
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// PersistenceUnitProperties.JDBC_DRIVER
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EntityManager em = factory.createEntityManager();
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em.getTransaction().begin();
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Query q = em.createQuery("select m from ExampleEntity m");
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if(q.getResultList().size()>0){
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ExampleEntity example=read(em, 3);
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System.out.println("Read OK:"+example.getName()+" "+example.getId());
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}else{
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ExampleEntity example=new ExampleEntity();
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example.setId(4);
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example.setName("name_4");
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example.setDescription("description_4");
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example.setTempValue(5);
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write(em, example);
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System.out.println("Write OK:"+example.getName()+" "+example.getId());
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}
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em.close();
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factory.close();
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}
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/** ïðèìåð çàïèñè îáúåêòà ÷åðåç JPA */
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private void write(EntityManager manager, ExampleEntity example){
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manager.persist(example);
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}
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/** ïðèìåð ÷òåíèÿ îáúåêòà ÷åðåç JPA */
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private ExampleEntity read(EntityManager manager, int key){
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Query q = manager.createQuery("select m from ExampleEntity m where m.id="+key);
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List list=q.getResultList();
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return (ExampleEntity)list.get(0);
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}
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}

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