basketcontrollerbean.java

一个java

package bookstore.ejb;

import bookstore.util.*;

import java.sql.*;
import javax.sql.*;
import java.util.*;
import javax.ejb.*;


public class BasketControllerBean implements SessionBean
{
  SessionContext sessionContext;
  private String basketID;
  private BasketHome basketHome;
  private Basket basket;
  private Connection con;

  /*************************** removal methods*****************************/

public String createBasket(BasketDetails BasketValue) throws Exception {
      // makes a new Basket and enters it into db,
      // returns BasketId

      System.out.println("BasketControllerBean createBasket");

      try
      {
        basket = basketHome.create(BasketValue);
      }
      catch (Exception ex)
      {
          throw new EJBException
           ("createBasket: " + ex.getMessage());
      }

      return basketID;
  }// createBasket

  public void removeBasket(String basketId) throws NoSuchEntityException {
    //抛出RunTimeException的子类,有利于事务管理

       // removes Basket from db

        System.out.println("BasketControllerBean removeBasket");

        if (isBasketExist(basketId) == false)
            throw new NoSuchEntityException(basketId);

        try {
             basket.remove();//Basket已在isBasketExist中获得
            }catch (Exception ex)
            {
             throw new EJBException
             ("removeBasket: " + ex.getMessage());
        }

    } // removeBasket

    public void updateBasket(BasketDetails basketValue)
        throws NoSuchEntityException
     {
       System.out.println("BasketControllerBean updateBasket");

       if (isBasketExist(basketValue.getBasketID()) == false)
            throw new NoSuchEntityException(basketValue.getBasketID());

         basket.setCustomerID(basketValue.getCustomerID());
         basket.setBookID(basketValue.getBookID());
         basket.setAddDate(basketValue.getAddDate());

     }//updateBasket

     public BasketDetails getBasketValue(String basketId)
             {
               System.out.println("basketControllerBean getbasketValue");
               try
                    {
                        basket = basketHome.findByPrimaryKey(basketId);
                        this.basketID = basketId;
                    } catch (Exception ex)
                    {
                        return null;
                    }
                    return basket.getDetails();
             }


/******************************ejb methods*********************************/

  public void ejbCreate() throws CreateException {
    System.out.println("BasketControllerBean ejbCreate");

        try {
            //创建下一层的引导接口
            basketHome=EJBGetter.getBasketHome();

        } catch (Exception ex) {
             System.out.println("BasketControllerBean catch");
             throw new EJBException("ejbCreate: " +
                 ex.getMessage());
        }

        basket = null;
        basketID = null;
  }//ejbCreate

  public void ejbRemove() {
    /**@todo Complete this method*/
  }
  public void ejbActivate() {
    /**@todo Complete this method*/
  }
  public void ejbPassivate() {
    /**@todo Complete this method*/
  }
  public void setSessionContext(SessionContext sessionContext) {
    this.sessionContext = sessionContext;
  }
  /******************************util methods****************************/
  private boolean isBasketExist(String basketId) {

        // If a business method has been invoked with
        // a different BasketId, then update the
        // BasketId and Basket variables.
        // Return null if the Basket is not found.

        System.out.println("BasketControllerBean isBasketExist");

        if (basketId.equals(this.basketID) == false)
        {
            try
            {
                basket = basketHome.findByPrimaryKey(basketId);
                this.basketID = basketId;
            } catch (Exception ex)
            {
                return false;
            }
        } // if
        return true;

    }// isBasketExist

}