JPA Development Environment Setup : Introduction « JPA

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Java Tutorial » JPA » Introduction

22. 1. 1. JPA Development Environment Setup

File: Helper.java


import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.ResultSet;

import java.sql.ResultSetMetaData;

import java.sql.Statement;



public class Helper {

  public static void checkData() throws Exception {

    Class.forName("org.hsqldb.jdbcDriver");

    Connection conn = DriverManager.getConnection("jdbc:hsqldb:data/tutorial", "sa", "");

    Statement st = conn.createStatement();



    ResultSet mrs = conn.getMetaData().getTables(null, null, null, new String[] { "TABLE" });

    while (mrs.next()) {

      String tableName = mrs.getString(3);

      System.out.println("\n\n\n\nTable Name: "+ tableName);



      ResultSet rs = st.executeQuery("select * from " + tableName);

      ResultSetMetaData metadata = rs.getMetaData();

      while (rs.next()) {

        System.out.println(" Row:");

        for (int i = 0; i < metadata.getColumnCount(); i++) {

          System.out.println("    Column Name: "+ metadata.getColumnLabel(i + 1)+ ",  ");

          System.out.println("    Column Type: "+ metadata.getColumnTypeName(i + 1)+ ":  ");

          Object value = rs.getObject(i + 1);

          System.out.println("    Column Value: "+value+"\n");

        }

      }

    }

  }

}

File: Main.java


import javax.persistence.EntityManager;

import javax.persistence.EntityManagerFactory;

import javax.persistence.Persistence;



public class Main {

  public static void main(String[] a) throws Exception {

    EntityManagerFactory emf = Persistence.createEntityManagerFactory("JPAService");

    EntityManager em = emf.createEntityManager();

    em.getTransaction().begin();

    

    

    em.persist(new Student());

    em.flush();

    em.persist(new Student());

    em.flush();



    

    

    em.getTransaction().commit();

    Helper.checkData();

    em.close();

    emf.close();

  }

}

File: Student.java


import java.util.Date;



import javax.persistence.Basic;

import javax.persistence.Entity;

import javax.persistence.Id;



@Entity

public class Student {

  @Id

  private long id = System.currentTimeMillis();



  @Basic

  private String name;



  @Basic

  private Date dateOfBirth = new Date();



  public Date getDateOfBirth() {

    return dateOfBirth;

  }



  public void setDateOfBirth(Date dateOfBirth) {

    this.dateOfBirth = dateOfBirth;

  }



  public long getId() {

    return id;

  }



  public void setId(long id) {

    this.id = id;

  }



  public String getName() {

    return name;

  }



  public void setName(String name) {

    this.name = name;

  }

  

  

}

File: persistence.xml


<persistence xmlns="http://java.sun.com/xml/ns/persistence"

             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

             xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence" version="1.0">

  <persistence-unit name="JPAService" transaction-type="RESOURCE_LOCAL">

    <properties>

      <property name="hibernate.dialect" value="org.hibernate.dialect.HSQLDialect"/>

      <property name="hibernate.hbm2ddl.auto" value="update"/>

      <property name="hibernate.connection.driver_class" value="org.hsqldb.jdbcDriver"/>

      <property name="hibernate.connection.username" value="sa"/>

      <property name="hibernate.connection.password" value=""/>

      <property name="hibernate.connection.url" value="jdbc:hsqldb:data/tutorial"/>

    </properties>

  </persistence-unit>

</persistence>

Download: JPA-EnvSetup.zip( 5,286 k)

22. 1. Introduction
	22. 1. 1.	JPA Development Environment Setup
	22. 1. 2.	Persistance Configuration
	22. 1. 3.	Seven Entities
	22. 1. 4.	Mark Class As Entity
	22. 1. 5.	Set Column Name For Accessor
	22. 1. 6.	Mark Property Accessor
	22. 1. 7.	Field Injection ID

JPA Development Environment Setup : Introduction « JPA « Java Tutorial