Source Code : Lifecycle CallBack For One Subclass

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Lifecycle CallBack For One Subclass

File: ContractProfessor.java


import javax.persistence.Column;
import javax.persistence.DiscriminatorValue;
import javax.persistence.Entity;
import javax.persistence.EntityListeners;
import javax.persistence.ExcludeSuperclassListeners;
import javax.persistence.PrePersist;
import javax.persistence.Table;

@Entity
@Table(name="CONTRACT_EMP")
@DiscriminatorValue("1")
@ExcludeSuperclassListeners
@EntityListeners(ProfessorDebugListener.class)
public class ContractProfessor extends Professor {
    @Column(name="D_RATE")
    private int dailyRate;
    private int term;
    
    @PrePersist
    public void verifyTerm() { 
        System.out.println("ContractProfessor.verifyTerm called on employee: " + getId());

    }

    public int getDailyRate() {
        return dailyRate;
    }
    
    public void setDailyRate(int dailyRate) {
        this.dailyRate = dailyRate;
    }
    
    public int getTerm() {
        return term;
    }
    
    public void setTerm(int term) {
        this.term = term;
    }

    public String toString() {
        return "ContractProfessor id: " + getId() + " name: " + getName();
    }
}


File: PartTimeProfessor.java


import javax.persistence.Column;
import javax.persistence.DiscriminatorValue;
import javax.persistence.Entity;
import javax.persistence.EntityListeners;
import javax.persistence.PrePersist;
import javax.persistence.PreUpdate;
import javax.persistence.Table;

@Entity
@EntityListeners({})
@Table(name="PT_EMP")
@DiscriminatorValue("3")
public class PartTimeProfessor extends Professor {
    @Column(name="H_RATE")
    private float hourlyRate;

    public float getHourlyRate() {
        return hourlyRate;
    }

    public void setHourlyRate(float hourlyRate) {
        this.hourlyRate = hourlyRate;
    }
    
    @PrePersist
    @PreUpdate
    public void verifyVacation() {
        System.out.println("PartTimeProfessor.verifyVacation called on employee: " + getId());
    }

    public String toString() {
        return "PartTimeProfessor id: " + getId() + " name: " + getName();
    }
}


File: Professor.java


import java.util.Date;

import javax.persistence.Column;
import javax.persistence.DiscriminatorColumn;
import javax.persistence.DiscriminatorType;
import javax.persistence.Entity;
import javax.persistence.EntityListeners;
import javax.persistence.Id;
import javax.persistence.Inheritance;
import javax.persistence.InheritanceType;
import javax.persistence.PostLoad;
import javax.persistence.PostPersist;
import javax.persistence.PostUpdate;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;
import javax.persistence.Transient;

@Entity
@Table(name="EMP")
@Inheritance(strategy=InheritanceType.JOINED)
@DiscriminatorColumn(name="EMP_TYPE", discriminatorType=DiscriminatorType.INTEGER)
@EntityListeners(ProfessorDebugListener.class)
public abstract class Professor {
    @Id private int id;
    private String name;
    @Temporal(TemporalType.DATE)
    @Column(name="S_DATE")
    private Date startDate;
    @Transient private long syncTime;

    @PostPersist
    @PostUpdate
    @PostLoad 
    private void resetSyncTime() { 
        System.out.println("Professor.resetSyncTime called on employee: " + getId());
        syncTime = System.currentTimeMillis(); 
    }

    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 Date getStartDate() {
        return startDate;
    }

    public void setStartDate(Date startDate) {
        this.startDate = startDate;
    }

    public String toString() {
        return "Professor id: " + getId() + " name: " + getName();
    }
}


File: ProfessorDebugListener.java

import javax.persistence.PostPersist;

public class ProfessorDebugListener {
  @PostPersist
  public void auditNewHire(Professor emp) { 
      System.out.println(" called on employee: " + emp.getId());
  }

}


File: ProfessorService.java

import java.util.Collection;

import javax.persistence.EntityManager;
import javax.persistence.Query;

public class ProfessorService {
  protected EntityManager em;

  public ProfessorService(EntityManager em) {
    this.em = em;
  }

  public Professor createProfessor(int id, String name) {
    Professor emp = new PartTimeProfessor();
    emp.setId(id);
    emp.setName(name);
    em.persist(emp);
    return emp;
  }

  public void removeProfessor(int id) {
    Professor emp = findProfessor(id);
    if (emp != null) {
      em.remove(emp);
    }
  }

  public Professor changeProfessorName(int id, String newName) {
    Professor emp = findProfessor(id);
    if (emp != null) {
      emp.setName(newName);
    }
    return emp;
  }

  public Professor findProfessor(int id) {
    return em.find(Professor.class, id);
  }

  public Collection<Professor> findAllProfessors() {
    Query query = em.createQuery("SELECT e FROM Professor e");
    return (Collection<Professor>) query.getResultList();
  }

}


File: JPAUtil.java

import java.io.Reader;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.Statement;

public class JPAUtil {
  Statement st;
  
  public JPAUtil() throws Exception{
    Class.forName("org.hsqldb.jdbcDriver");
    System.out.println("Driver Loaded.");
    String url = "jdbc:hsqldb:data/tutorial";

    Connection conn = DriverManager.getConnection(url, "sa", "");
    System.out.println("Got Connection.");
    st = conn.createStatement();
  }
  public void executeSQLCommand(String sql) throws Exception {
    st.executeUpdate(sql);
  }
  public void checkData(String sql) throws Exception {
    ResultSet rs = st.executeQuery(sql);
    ResultSetMetaData metadata = rs.getMetaData();

    for (int i = 0; i < metadata.getColumnCount(); i++) {
      System.out.print("	"+ metadata.getColumnLabel(i + 1)); 
    }
    System.out.println("
----------------------------------");

    while (rs.next()) {
      for (int i = 0; i < metadata.getColumnCount(); i++) {
        Object value = rs.getObject(i + 1);
        if (value == null) {
          System.out.print("	       ");
        } else {
          System.out.print("	"+value.toString().trim());
        }
      }
      System.out.println("");
    }
  }
}


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 {
    JPAUtil util = new JPAUtil();

    EntityManagerFactory emf = Persistence.createEntityManagerFactory("ProfessorService");
    EntityManager em = emf.createEntityManager();
    ProfessorService service = new ProfessorService(em);

    em.getTransaction().begin();

    service.createProfessor(1, "name");
    for (Professor emp : service.findAllProfessors()) {
      System.out.print(emp);
    }
    service.changeProfessorName(1, "newname");
    for (Professor emp : service.findAllProfessors()) {
      System.out.print(emp);
    }
    service.removeProfessor(1);

    for (Professor emp : service.findAllProfessors()) {
      System.out.print(emp);
    }

    util.checkData("select * from CONTRACT_EMP");

    em.getTransaction().commit();
    em.close();
    emf.close();
  }
}





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>



           
       

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