Student.java Source code

Introduction

Here is the source code for Student.java

Source

    File:Student.java

    import java.util.Date;

    import javax.persistence.Entity;
    import javax.persistence.EnumType;
    import javax.persistence.Enumerated;
    import javax.persistence.Id;

@Entity
public class Student {
  @Id
  private long id = 0;

  private String name;

  private Date dateOfBirth = new Date();

  @Enumerated(EnumType.ORDINAL)
  private Gender gender;

  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;
  }

  public Gender getGender() {
    return gender;
  }

  public void setGender(Gender gender) {
    this.gender = gender;
  }

  public String toString() {
    return "\n\nID:" + id + "\nName:" + name + "\nBirthday:" + dateOfBirth + "\nGender:"
        + gender+"\n\n";
  }
}

    File:Gender.java

    public enum Gender {
        MALE, FEMALE
    }

    File:JPADAO.java

    import java.util.Date;
    import java.util.List;

    import javax.persistence.EntityManager;
    import javax.persistence.EntityManagerFactory;
    import javax.persistence.Persistence;
    import javax.persistence.Query;

public class JPADAO {
  EntityManagerFactory emf = Persistence.createEntityManagerFactory("JPAService");
  EntityManager em = emf.createEntityManager();

  public void create() {
    em.getTransaction().begin();
    
    
    Student student = new Student();
    student.setId(1);
    student.setName("Joe");
    student.setDateOfBirth(new Date());
    student.setGender(Gender.FEMALE);
    
    
    em.persist(student);
    em.flush();
    em.getTransaction().commit();
  }

  public void search() {
    Query q = em.createQuery("select m from Student m");
    for (Student m : (List<Student>) q.getResultList()) {
      System.out.println(m);
    }
  }

  public void close() {
    em.close();
    emf.close();
  }
}

    File:Main.java

    import java.util.List;

    import javax.persistence.EntityManager;
    import javax.persistence.EntityManagerFactory;
    import javax.persistence.Persistence;
    import javax.persistence.Query;

public class Main {
  public static void main(String[] a) throws Exception {
    JPADAO jpaDao = new JPADAO();
    
    jpaDao.create();
    jpaDao.search();
    
    
    jpaDao.close();
    Helper.checkData();
  }
}
    /*
    
    [java] Table Name: STUDENT
    [java]  Row:
    [java]     Column Name: ID,
    [java]     Column Type: BIGINT:
    [java]     Column Value: 1
    
    [java]     Column Name: DATEOFBIRTH,
    [java]     Column Type: TIMESTAMP:
    [java]     Column Value: 2008-11-05 13:32:00.35
    
    [java]     Column Name: GENDER,
    [java]     Column Type: VARCHAR:
    [java]     Column Value: FEMALE
    
    [java]     Column Name: NAME,
    [java]     Column Type: VARCHAR:
    [java]     Column Value: Joe
    
    
    */

    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: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>