Use JDBC In EJB : DataSource JDBC « EJB3 « Java Tutorial

1. Java Tutorial
2. EJB3
3. DataSource JDBC

File: Customer.java

import javax.persistence.Entity;
import javax.persistence.EntityListeners;
import javax.persistence.Id;
import javax.persistence.PostRemove;

@Entity
@EntityListeners(EntityListener.class)
public class Customer implements java.io.Serializable {
  private String firstName;

  private String lastName;
  @Id
  private long ssn;

  public String getFirstName() {
    return firstName;
  }

  public void setFirstName(String firstName) {
    this.firstName = firstName;
  }


  public String getLastName() {
    return lastName;
  }

  public void setLastName(String lastName) {
    this.lastName = lastName;
  }


  public long getSsn() {
    return ssn;
  }

  public void setSsn(long ssn) {
    this.ssn = ssn;
  }

}

File: EmployeeBean.java

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;

import javax.annotation.Resource;
import javax.ejb.EJBException;
import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.sql.DataSource;

@Stateless
public class EmployeeBean implements EmployeeServiceLocal, EmployeeServiceRemote {
  @PersistenceContext(unitName="EmployeeService") private EntityManager manager;
  
  @Resource(mappedName="java:/DefaultDS") DataSource dataSource;
  public void doAction(){
    PreparedStatement ps = null;
    Connection con = null;

    try
    {
       con = dataSource.getConnection();

       System.out.println("Creating table PAYMENT...");
       ps = con.prepareStatement("drop TABLE PAYMENT");
       ps.execute();
       ps = con.prepareStatement("CREATE TABLE PAYMENT ( " +
                                 "CUSTOMER_ID INT, " +
                                 "AMOUNT DECIMAL (8,2), " +
                                 "TYPE CHAR (10), " +
                                 "CHECK_BAR_CODE CHAR (50), " +
                                 "CHECK_NUMBER INTEGER, " +
                                 "CREDIT_NUMBER CHAR (20), " +
                                 "CREDIT_EXP_DATE DATE" +
                                 ")");
       ps.execute();
       System.out.println("...done!");
    }
    catch (SQLException sql)
    {
       throw new EJBException(sql);
    }
    finally
    {
       try { if (ps != null) ps.close(); } catch (Exception e) {}
       try { if (con != null) con.close(); } catch (Exception e) {}
    }    
    Customer cust = new Customer();

    cust.setLastName("Bond");
    cust.setSsn(1L);
    manager.persist(cust);
    
    System.out.println("Saved");
    
    cust = manager.find(Customer.class,1L);
    System.out.println(cust.getLastName());
    
    cust.setLastName("new name");
    
    manager.persist(cust);
    
    cust = manager.find(Customer.class,1L);
    System.out.println(cust.getLastName());
    
    manager.remove(cust);
    
    
    
  }
}

File: EmployeeServiceLocal.java

import javax.ejb.Local;
import javax.jws.WebParam;

@Local
public interface EmployeeServiceLocal {
  public void doAction();


}

File: EmployeeServiceRemote.java

import javax.ejb.Remote;


@Remote
public interface EmployeeServiceRemote {
  public void doAction();
}

File: EntityListener.java

import javax.persistence.PostRemove;

public class EntityListener {

  
  @PostRemove
  public void remove(Object entity)
  {
     System.out.println("@PostRemove: " + entity.getClass().getName());
  }
}

File: jndi.properties

java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory
java.naming.factory.url.pkgs=org.jboss.naming:org.jnp.interfaces
java.naming.provider.url=localhost:1099

File: Main.java

import javax.ejb.EJB;
import javax.naming.InitialContext;


public class Main {

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

    EmployeeServiceRemote service = null;

    // Context compEnv = (Context) new InitialContext().lookup("java:comp/env");

    // service = (HelloService)new
    // InitialContext().lookup("java:comp/env/ejb/HelloService");
    service = (EmployeeServiceRemote) new InitialContext().lookup("EmployeeBean/remote");


    service.doAction();
    


  }

}

27.19.DataSource JDBC
	27.19.1.	Inject DataSource
	27.19.2.	Use JDBC In EJB