indy.java

大量java源程序

/*
 * @(#)Indy
 *
 * Copyright (c) 1998 Karl Moss. All Rights Reserved.
 *
 * You may study, use, modify, and distribute this software for any
 * purpose provided that this copyright notice appears in all copies.
 *
 * This software is provided WITHOUT WARRANTY either expressed or
 * implied.
 *
 * @author  Karl Moss
 * @version 1.0
 * @date    17Apr98
 *
 */

package javaservlets.tunnel;
import java.sql.Date;
import java.sql.*;

/**
  * <p>Implements the IndyInterface to provide query capabilities
  * into the Indianapolis 500 database.
  */

public class Indy implements IndyInterface
{
  // The JDBC Connection
  Connection m_connection = null;

  // A prepared statement to use to query the database
  PreparedStatement m_ps = null;

  /**
    * <p>Connects to the database.
    *
    * @return True if the database connection was established
    */
  public boolean connect()
    {
      boolean rc = false;

      try {

        // Load the Bridge
        Class.forName("sun.jdbc.odbc.JdbcOdbcDriver").newInstance();

        // Connect to the Access database
        m_connection =
          DriverManager.getConnection("jdbc:odbc:MyAccessDataSource1");

        // Go ahead and create a prepared statement

        rc = true;
      }
      catch (Exception ex) {
        ex.printStackTrace();
      }

      return rc;
    }

  /**
    * <p>Closes the database connection
    */
  public void close()
    {
      // Close the connection if it was opened
      if (m_connection != null) {
        try {
          m_connection.close();
        }
        catch (SQLException ex) {
          ex.printStackTrace();
        }
        m_connection = null;
      }
    }

  /**
    * <p>Given the year return the corresponding Indianapolis
    * 500 record
    *
    * @param year Year of the race
    * @return Indy 500 record or null if not found
    */
  public IndyRecord[] query()
    {
       int index=0;
       try
       {  m_ps = m_connection.prepareStatement
                      ("SELECT * from wang " );
         ResultSet as = m_ps.executeQuery();
         while(as.next())
         { index=index+1;
         }
       }
       catch (SQLException ex) {
        ex.printStackTrace();
        System.out.println("rs is bad");
                                }
       IndyRecord record[]=new IndyRecord[index];
      try {
        ResultSet rs = m_ps.executeQuery();
         int j=0;
         while(rs.next())
        { //我要在这里写一个将结果集所有纪录写入一个对象数组中
          IndyRecord indy=new IndyRecord();
          indy.taskID=rs.getString(1);
          indy.describe = rs.getString(2);
          indy.ygongqi=rs.getInt(3);
          indy.sgongqi=rs.getInt(4);
          indy.centigrade=rs.getFloat(5);
          indy.es=Date.valueOf(rs.getDate(6).toString());
          indy.ef=Date.valueOf(rs.getDate(7).toString());
          indy.floatime=rs.getInt(8);
          record[j]=indy;
          System.out.println("I wang to get rs.getString:"+record[j].taskID);
          j++;
          }

        rs.close();
      }
      catch (SQLException ex) {
        ex.printStackTrace();
        System.out.println("rs is bad");
      }
      System.out.println("rs is good");
      return record;
    }
  public  void delete(String taskid)
    {
       try {  m_ps = m_connection.prepareStatement
                      ("DELETE  from wang WHERE taskID=?" );

          // Set the taskid parameter
          m_ps.setString(1, taskid);

          // Execute the delete
        System.out.println("Execute the delete");
         m_ps.executeUpdate();
            }
      catch (SQLException ex) {
        ex.printStackTrace();
      }
    }
   public void insert(IndyRecord record)
   {   System.out.println("I want to insert:"+record.centigrade);
       try {  m_ps = m_connection.prepareStatement
   ("INSERT  INTO wang(taskID,describe,ygongqi,sgongqi,floatime,es,ef) VALUES(?,?,?,?,?,?,?)");
        // Execute the insert
      m_ps.setString(1,record.taskID);
      m_ps.setString(2,record.describe);
      m_ps.setInt(3,record.ygongqi);
      m_ps.setInt(4,record.sgongqi);
      Float f=new Float(record.centigrade);
     // m_ps.setFloat(8,f.floatValue());
      m_ps.setDate(6,record.es);
      m_ps.setDate(7,record.ef);
      m_ps.setInt(5,record.floatime);
      m_ps.executeUpdate();
      System.out.println("Has executed insert methods reocrd.taskid"+record.taskID);
            }
      catch (SQLException ex) {
        ex.printStackTrace();
      }

   }
   public void update(IndyRecord record)
   { System.out.println("I want to update:"+record.taskID);
       try {  m_ps = m_connection.prepareStatement
("UPDATE wang SET taskID=?,describe=? ,ygongqi=?,sgongqi=?,floatime=?,es=?,ef=? WHERE taskID=?");
        // Execute the update
      m_ps.setString(8,record.taskID);
      m_ps.setString(1,record.taskID);
      m_ps.setString(2,record.describe);
      m_ps.setInt(3,record.ygongqi);
      m_ps.setInt(4,record.sgongqi);
      //Float f=new Float(record.centigrade);
      //m_ps.setFloat(8,f.floatValue());
      m_ps.setDate(6,record.es);
      m_ps.setDate(7,record.ef);
      m_ps.setInt(5,record.floatime);
     int a= m_ps.executeUpdate();
      System.out.println("Has executed UPDATE methods reocrd.taskid"+record.taskID);
       System.out.println("a= "+a);
            }
      catch (SQLException ex) {
        ex.printStackTrace();
      }
   }



   }