managercontrollerbean.java

一个java

package bookstore.ejb;

import bookstore.util.*;

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


public class ManagerControllerBean implements SessionBean
{
  SessionContext sessionContext;
  private String managerID;
  private ManagerHome managerHome;
  private Manager manager;
  private Connection con;

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

public String createManager(ManagerDetails managerValue) throws Exception {
      // makes a new Manager and enters it into db,
      // returns ManagerId

      System.out.println("ManagerControllerBean createManager");

      try
      {
        manager = managerHome.create(managerValue);
      }
      catch (Exception ex)
      {
          throw new EJBException
           ("createManager: " + ex.getMessage());
      }

      return managerID;
  }// createManager

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

       // removes Manager from db

        System.out.println("ManagerControllerBean removeManager");

        if (isManagerExist(managerId) == false)
            throw new NoSuchEntityException(managerId);

        try {
             manager.remove();//Manager已在isManagerExist中获得
            }catch (Exception ex)
            {
             throw new EJBException
             ("removeManager: " + ex.getMessage());
        }

    } // removeManager

    public void updateManager(ManagerDetails managerValue)
        throws NoSuchEntityException
     {
       System.out.println("ManagerControllerBean updateManager");

       if (isManagerExist(managerValue.getManagerID()) == false)
            throw new NoSuchEntityException(managerValue.getManagerID());

         manager.setName(managerValue.getName());
         manager.setPassword(managerValue.getPassword());

     }//updateManager

     public ManagerDetails getManagerValue(String managerId)
        {
          System.out.println("managerControllerBean getmanagerValue");
          try
               {
                   manager = managerHome.findByPrimaryKey(managerId);
                   this.managerID = managerId;
               } catch (Exception ex)
               {
                   return null;
               }
               return manager.getDetails();
        }


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

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

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

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

        manager = null;
        managerID = 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 isManagerExist(String managerId) {

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

        System.out.println("ManagerControllerBean isManagerExist");

        if (managerId.equals(this.managerID) == false)
        {
            try
            {
                manager = managerHome.findByPrimaryKey(managerId);
                this.managerID = managerId;
            } catch (Exception ex)
            {
                return false;
            }
        } // if
        return true;

    }// isManagerExist

}