supplierbean.java

一个java

package bookstore.ejb;

import bookstore.util.*;

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


public class SupplierBean implements EntityBean
{
  java.lang.String supplierID;
  java.lang.String company;
  java.lang.String person;
  java.lang.String phone;
  java.lang.String address;
  java.lang.String zip;

  private Connection con=null;
  EntityContext entityContext;

  /********************************business methods****************************/
  public void setSupplierID(java.lang.String supplierID) {
    this.supplierID = supplierID;
  }
  public void setCompany(java.lang.String company) {
    this.company = company;
  }
  public void setPerson(java.lang.String person) {
    this.person = person;
  }
  public void setPhone(java.lang.String phone) {
    this.phone = phone;
  }
  public void setAddress(java.lang.String address) {
    this.address = address;
  }
  public void setZip(java.lang.String zip) {
    this.zip = zip;
  }
  public java.lang.String getSupplierID() {
    return supplierID;
  }
  public java.lang.String getCompany() {
    return company;
  }
  public java.lang.String getPerson() {
    return person;
  }
  public java.lang.String getPhone() {
    return phone;
  }
  public java.lang.String getAddress() {
    return address;
  }
  public java.lang.String getZip() {
    return zip;
  }
  public SupplierDetails getDetails()
   {
      System.out.println("commentBean getDetails");

      return new SupplierDetails (supplierID,company ,person,phone,address,zip);
   }//getDetails

  /********************************ejb methods**************************/
  public java.lang.String ejbCreate(SupplierDetails supplierValue) throws CreateException {
    System.out.println("supplierBean ejbCreate");

        try
        {
          makeConnection();
          this.supplierID=DBHelper.getNextSupplierID(con);
        }catch(Exception ex)
        {
          throw new EJBException("ejbCreate: "+ex.getMessage());
        }

        this.company=supplierValue.getCompany();
        this.person=supplierValue.getPerson();
        this.phone=supplierValue.getPhone();
        this.address=supplierValue.getAddress();
        this.zip=supplierValue.getZip();

        try {
            insertRow();
        } catch (Exception ex) {
             throw new EJBException("ejbCreate: " +
                 ex.getMessage());
        }

        return supplierID;

  }

  public void ejbPostCreate(SupplierDetails supplierValue) throws CreateException {
    System.out.println("supplierBean ejbPostCreate");
  }

  public java.util.Collection ejbFindByCondition(String condition) throws FinderException {
    System.out.println("supplierBean ejbFindByCondition");

    Collection result;

    try {
           result = selectByCondition(condition);
       } catch (Exception ex) {
             throw new EJBException("ejbFindByCondition " +
                 ex.getMessage());
       }
       return result;

  }

  public void ejbRemove() throws RemoveException {
    System.out.println("supplierBean ejbRemove");

    try {
            deleteRow(supplierID);
         } catch (Exception ex) {
              throw new EJBException("ejbRemove: " +
                  ex.getMessage());
         }
  }//ejbRemove

  public java.lang.String ejbFindByPrimaryKey(java.lang.String primaryKey) throws FinderException {

         System.out.println("supplierBean ejbFindByPrimaryKey");

         boolean result;

         try {
             result = selectByPrimaryKey(primaryKey);
         } catch (Exception ex) {
               throw new EJBException("ejbFindByPrimaryKey: " +
                   ex.getMessage());
         }

         if (result) {
             return primaryKey;
         }
         else {
             throw new ObjectNotFoundException
                 ("Row for id " + primaryKey + " not found.");
         }
     }

     public void ejbLoad() {

          System.out.println("supplierBean ejbLoad");

          try {
              loadSupplier();
           } catch (Exception ex) {
                throw new EJBException("ejbLoad: " +
                    ex.getMessage());
           }
      }//ejbLoad

      public void ejbStore()
      {

            System.out.println("supplierBean ejbStore");

            try {
                storeSupplier();
             } catch (Exception ex) {
                  throw new EJBException("ejbStore: " +
                      ex.getMessage());
             }
        }//ejbStore

  public void ejbActivate()
  {
        System.out.println("supplierBean ejbActivate");
        supplierID = (String)entityContext.getPrimaryKey();
    }

    public void ejbPassivate()
    {
        System.out.println("supplierBean ejbPassivate");

        supplierID= null;
    }

  public void unsetEntityContext()
  {
    System.out.println("supplierBean ussetEntiyContext");
    this.entityContext = null;
  }
  public void setEntityContext(EntityContext entityContext) {
    System.out.println("supplierBean setEntiyContext");
    this.entityContext = entityContext;
  }

  /****************************util methods*******************************/
  private void makeConnection() {

        System.out.println("supplierBean makeConnection in");
        try
           {
             InitialContext ic = new InitialContext();
             DataSource ds = (DataSource) ic.lookup("DBSource");
             con = ds.getConnection();
           }
           catch (Exception ex)
           {
             throw new EJBException("Unable to connect to database. " +
                                   ex.getMessage());
           }
        System.out.println("supplierBean makeConnection out");
    } // makeConnection


    private void releaseConnection() {

        System.out.println("supplierBean releaseConnection in");

        try {
            con.close();
        } catch (SQLException ex) {
             throw new EJBException("releaseConnection: " + ex.getMessage());
        }
        System.out.println("supplierBean releaseConnection out");

    } // releaseConnection


    private void insertRow () throws SQLException {

        System.out.println("supplierBean insertRow in");

        makeConnection();
        String insertStatement =
            "insert into supplier values ( ? , ? , ? , ? ,? ,?)";
        PreparedStatement prepStmt =
            con.prepareStatement(insertStatement);
        prepStmt.setString(1, supplierID);
        prepStmt.setString(2, company);
        prepStmt.setString(3, person);
        prepStmt.setString(4,phone);
        prepStmt.setString(5,address);
        prepStmt.setString(6,zip);

        prepStmt.executeUpdate();
        prepStmt.close();
        releaseConnection();
        System.out.println("supplierBean insertRow out");
    }//insertRow

    private Collection selectByCondition(String condition) throws SQLException {

       System.out.println("supplierBean selectByCondition in");

       makeConnection();
       String selectStatement =
               "select supplierID " +
               "from supplier where "+condition;
       System.out.println(selectStatement);
       Statement stmt=con.createStatement();
       ResultSet rs=stmt.executeQuery(selectStatement);

       ArrayList a = new ArrayList();
       while (rs.next())
       {
           a.add(rs.getString(1));
       }

       stmt.close();
       releaseConnection();
       System.out.println("supplierBean selectByCondition out");
       return a;
   }//selectByCondition

   private boolean selectByPrimaryKey(String primaryKey) throws SQLException {
        //本函数主要目的还在于确保supplier_id在数据库表中是存在的
        System.out.println("supplierBean selectByPrimaryKey in");

        makeConnection();
        //a question here
        String selectStatement =
                "select supplierID " +
                "from supplier where supplierID = ? ";
        PreparedStatement prepStmt =
                con.prepareStatement(selectStatement);
        prepStmt.setString(1, primaryKey);

        ResultSet rs = prepStmt.executeQuery();
        boolean result = rs.next();
        prepStmt.close();
        releaseConnection();
        System.out.println("supplierBean selectByPrimaryKey out");
        return result;
    }//selectByPrimaryKey

    private void loadSupplier() throws SQLException {

        System.out.println("supplierBean loadsupplier in");

        makeConnection();
        String selectStatement =
                "select company, person,phone,address,zip " +
                "from supplier where supplierID = ? ";
        PreparedStatement prepStmt =
                con.prepareStatement(selectStatement);

        prepStmt.setString(1, supplierID);

        ResultSet rs = prepStmt.executeQuery();

        if (rs.next())
        {
            company = rs.getString(1);
            person = rs.getString(2);
            phone=rs.getString(3);
            address=rs.getString(4);
            zip=rs.getString(5);
            prepStmt.close();
            releaseConnection();
        }
        else {
            prepStmt.close();
            releaseConnection();
            throw new NoSuchEntityException("loadsupplier:Row for id " +
                supplierID + " not found in database.");
        }
        System.out.println("supplierBean loadsupplier out");
    }//loadsupplier

    private void storeSupplier() throws SQLException {

        System.out.println("supplierBean storesupplier in");

        makeConnection();

        String updateStatement =
                "update supplier " +
                "set company = ? , person = ? , phone = ? ,address= ? ,zip= ? " +
                "where supplierID = ? ";
        PreparedStatement prepStmt =
                con.prepareStatement(updateStatement);

        prepStmt.setString(1,company);
        prepStmt.setString(2, person);
        prepStmt.setString(3,phone);
        prepStmt.setString(4,address);
        prepStmt.setString(5,zip);
        prepStmt.setString(6, supplierID);

        int rowCount = prepStmt.executeUpdate();
        prepStmt.close();
        releaseConnection();

        if (rowCount == 0) {
            throw new EJBException("storesupplier:Storing row for id " + supplierID + " failed.");
        }
        System.out.println("supplierBean storesupplier out");
    }//storesupplier

    private void deleteRow(String id) throws SQLException {

        System.out.println("supplierBean deleteRow in");

        makeConnection();
        String deleteStatement =
                "delete from supplier where supplierID = ? ";
        PreparedStatement prepStmt =
                con.prepareStatement(deleteStatement);

        prepStmt.setString(1, id);
        prepStmt.executeUpdate();
        prepStmt.close();
        releaseConnection();
        System.out.println("supplierBean deleteRow out");
    }/////deleteRow

}