b02fdf8a303d001d17a69a638fd816af

自己做的一个火车票售票网站是课程设计 用的是servlet+jsp 数据库是ms

package com.ajax;

import java.io.*;
import java.util.*;
import java.sql.*;
import com.jdbc.*;

public class Ajax {

    Statement psmt=null;
	ResultSet rt =null;
	String sql =null;
	DataBaseConnection dbc = new DataBaseConnection();
	public String getMessage(){
		String rs=null;
		int i=0;
		sql="select number,name from ajax where number1 is null order by name";
		try{
			psmt=dbc.getConnection().createStatement();
			rt=psmt.executeQuery(sql);
			rs="";
		     while (rt.next()) {
                 rs = rs+ "<option value=\"" + rt.getString(1) + "\""; //从1开始的
                 if (i == 0) {
                     rs = rs + " selected ";
                 }
                 rs = rs + ">" + rt.getString(2) + "</option>";
                 i++;
             }
		}
		catch(Exception e){
		}
		finally{
			try{
				psmt.close();
			}
			catch(Exception e){
				
			}
			dbc.close();
			
		}
		return rs;
	}
	
	public String getMessage(String code){
		String rs=null;
		
		sql="select distinct name from ajax where number1='"+code+"' ";
		try{
			psmt=dbc.getConnection().createStatement();
			rt=psmt.executeQuery(sql);
			rs="";
            while (rt.next()) {
                //rs = rs + rt.getString(1)+","+ rt.getString(2)+"$";
            	rs = rs + rt.getString(1)+"$";
            }
		}
		catch(Exception e){
		}
		finally{
			try{
				psmt.close();
			}
			catch(Exception e){
				
			}
			dbc.close();
		}
		return rs;
		
		
	}
	
	public String getMessage1(String code){
		String rs=null;
		
		sql="select distinct number from ajax where name='"+code+"' ";
		try{
			psmt=dbc.getConnection().createStatement();
			rt=psmt.executeQuery(sql);
			rs="";
            while (rt.next()) {
                rs = rs + rt.getString(1)+","+ rt.getString(2)+"$";
            }
		}
		catch(Exception e){
		}
		finally{
			try{
				psmt.close();
			}
			catch(Exception e){
				
			}
			dbc.close();
		}
		return rs;
		
		
	}

	
}