HashMap err --- Sql Exception - bad sql (pls see code)

Question

Hi
//Query A
ResultSet resultSet = statement.executeQuery("select sno,rank from school");
BufferedWriter writeout = new BufferedWriter(new FileWriter(EDU, false));
while(resultSet.next()){
                    sno = resultSet.getString(1);
                    rank= resultSet.getString(2);
                    if("25".equals(rank)) {
// When the rank value is 25 , i want the hashA  to have a key value pair in it , with value as 25 .
                        hashA.put(resultSet.getString(1),resultSet.getString(2));          /// ?? Sometimes the hashA  contains key but for that key the  value it contains is null
//Query B
resultSet = statement.executeQuery("select busno , driverno from License");
               BufferedWriter writeFlat = new BufferedWriter(new FileWriter(OUT, false));
               while(resultSet.next()){
                   busno = resultSet.getString(1);
               driverno = resultSet.getString(2);
               String rankOfB;
               rankOfB = hashA.get(resultSet.getString(1));                         // SO when i want to get the value it is giving an error SQL Exception - bad Sql  . How to make this code work ,
               System.out.println("The value of Rank is : "+rankOfB);             // and when i get a value which is null from hashA , it is giving an error ... PLS HELP
               writeFlat.close();
               resultSet.close();
          }catch (ClassNotFoundException classNotFound) {
               System.out.println("Driver not Found"+classNotFound.getMessage());
          } catch (SQLException sqlException) {
               System.out.println("SQL Exception - bad sql");
               System.out.println(sqlException.getMessage());
          } catch (IOException e) {
               e.printStackTrace();
                    Thank U in advance ...

Answer 1

you cannot read a column twice within the same row
this is the part form javadoc
The ResultSet interface provides getter methods (getBoolean, getLong, and so on) for retrieving column values from the current row. Values can be retrieved using either the index number of the column or the name of the column. In general, using the column index will be more efficient. Columns are numbered from 1. For maximum portability, result set columns within each row should be read in left-to-right order, and each column should be read only once.
rankOfB = hashA.get(resultSet.getString(1));
use busno instead of resultSet.getString(1)
Edited by: whitenight541 on Dec 29, 2008 8:13 AM