suppliercontrollerbean.java

一个java

package bookstore.ejb;

import bookstore.util.*;

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


public class SupplierControllerBean implements SessionBean
{
  SessionContext sessionContext;
  private String supplierID;
  private SupplierHome supplierHome;
  private Supplier supplier;
  private Connection con;

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

public String createSupplier(SupplierDetails supplierValue) throws Exception {
      // makes a new Supplier and enters it into db,
      // returns SupplierId

      System.out.println("SupplierControllerBean createSupplier");

      try
      {
        supplier = supplierHome.create(supplierValue);
      }
      catch (Exception ex)
      {
          throw new EJBException
           ("createSupplier: " + ex.getMessage());
      }

      return supplierID;
  }// createSupplier

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

       // removes Supplier from db

        System.out.println("SupplierControllerBean removeSupplier");

        if (isSupplierExist(supplierId) == false)
            throw new NoSuchEntityException(supplierId);

        try {
             supplier.remove();//Supplier已在isSupplierExist中获得
            }catch (Exception ex)
            {
             throw new EJBException
             ("removeSupplier: " + ex.getMessage());
        }

    } // removeSupplier

    public void updateSupplier(SupplierDetails supplierValue)
        throws NoSuchEntityException
     {
       System.out.println("SupplierControllerBean updateSupplier");

       if (isSupplierExist(supplierValue.getSupplierID()) == false)
            throw new NoSuchEntityException(supplierValue.getSupplierID());

         supplier.setCompany(supplierValue.getCompany());
         supplier.setPerson(supplierValue.getPerson());
         supplier.setPhone(supplierValue.getPhone());
         supplier.setAddress(supplierValue.getAddress());
         supplier.setZip(supplierValue.getZip());

     }//updateSupplier

     public SupplierDetails getSupplierValue(String supplierId)
     {
       System.out.println("SupplierControllerBean getSupplierValue");
       try
            {
                supplier = supplierHome.findByPrimaryKey(supplierId);
                this.supplierID = supplierId;
            } catch (Exception ex)
            {
                return null;
            }
            return supplier.getDetails();
     }

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

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

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

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

        supplier = null;
        supplierID = 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 isSupplierExist(String supplierId) {

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

        System.out.println("SupplierControllerBean isSupplierExist");

        if (supplierId.equals(this.supplierID) == false)
        {
            try
            {
                supplier = supplierHome.findByPrimaryKey(supplierId);
                this.supplierID = supplierId;
            } catch (Exception ex)
            {
                return false;
            }
        } // if
        return true;

    }// isSupplierExist

}