读取dbf文件出错,答对即给分

我写了用JAVA读取DBF的例子,一般的文件可以正确读写,可是有一个不行报下面的错,
请问一下,这可能是啥原因引起的?Exception java.sql.SQLException: [Microsoft][ODBC dBase Driver] 所有记录中均未找到搜索关键字。附:源代码如下,请指路    public void readdbFile(){
        Connection con = null;
        long begin = System.currentTimeMillis();
        //数据库连接
        try{
            Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
            con=DriverManager.getConnection("jdbc:odbc:DRIVER={Microsoft dBase Driver (*.dbf)};DBQ=D:\\hangqing2;","","");
            System.out.println("连接成功！");
        }catch(Exception e){
            System.out.println("数据库连接"+e);
        }
        boolean logic = true;
        ArrayList list = new ArrayList();
        while(logic){        
        try{                        
            Statement stmt = con.createStatement();                        
           
            String sql = "select * from SHOW20031";                      
            ResultSet rs = stmt.executeQuery(sql);
            while(rs.next()){
                  
              String stockno = rs.getString(1);
              System.out.println("stockno = "+stockno);
              ;
              if(!list.contains(stockno.substring(0,3))){
               list.add(stockno.substring(0,3));
              }
              
            }             
                              
            rs.close();            
            stmt.close();

        }catch(Exception e){
              System.out.println("Exception "+e);
        } 
        logic = false;
        }        
        System.out.println("**********************************");
        int size = list.size();
        for(int i = 0; i < size; i++){
         System.out.println(i+":"+list.get(i));
        }
    }我的主页:http://free2.e-168.cn/lovelyhome/index.jsp