ExecuteUpdate() returns 1 , but actually it has'nt updated the DB tables

Question

DATABASE USED : ORACLE 9i
This is the function that is been called.
althou, this returns a +ve ans. , saying that the db has been updated ; but when i login into the DB, i donot find the row updated.
public void process(File dir) throws Exception
     FileInputStream fileIn = null;
     byte b[] = null;
     PreparedStatement stmt = null;
     PreparedStatement stmtBank = null;
     PreparedStatement stmtBrand = null;
     ResultSet rs = null;
     String updateBankInfoTable = "UPDATE ARBANKINFO SET ISSUERLOGO_LARGE = ? WHERE BANKID=?";
     String updateBrandInfoTable = "UPDATE ARBRANDINFO SET ISSUERLOGO_LARGE = ? WHERE BANKID=? and RANGEID = ?";
     int bankId = 0;
     int rangeId = 0;
     // FileNotFoundException or SecurityException might
     // be thrown while reading the files in this dir.
     try{
     fileIn = new FileInputStream(dir);
     }catch(Exception e)
          e.printStackTrace(p);
     String fileNameStr = dir.getName();
     if (fileNameStr!=null || fileNameStr.length()>0)
          // Read the file in a byte array
          long fileLen = dir.length();
          int readBytes = 0;
     int totalRead = 0;
     b = new byte[(int)fileLen];
     while((long)totalRead < fileLen)
     try {
                    readBytes = fileIn.read(b, 0, (int)fileLen);
               } catch (IOException e1) {
                    e1.printStackTrace(p);
     totalRead += readBytes;
     if (fileIn != null)
     fileIn.close();
     try{
     if (bankIDString!=null)
          stmt = conn.prepareStatement("select BANKID,RANGEID from ARESENROLLPROCESS where MAINLOGOURL = ?" +
               "and BANKID IN ("+bankIDString+")");
     else
          stmt = conn.prepareStatement("select BANKID,RANGEID from ARESENROLLPROCESS where MAINLOGOURL = ?");
     stmt.setString(1,fileNameStr);
     rs = stmt.executeQuery();
     int i =1;
     while (rs.next())
          bankId = rs.getInt("BANKID");
               rangeId = rs.getInt("RANGEID");
               i++;
               if (rangeId!=0)
                    stmtBrand = conn.prepareStatement(updateBrandInfoTable);
                    stmtBrand.setBytes(1,b);
                    stmtBrand.setInt(2,bankId);
                    stmtBrand.setInt(3,rangeId);
                    if (stmtBrand.executeUpdate()==1)
                                             p.println("Updated ARBRANDINFO table ");
                    else
                         // log in something
                                             p.println("*** Column not found in ARBRANDINFO table");
               else if (rangeId == 0)
                    stmtBank = conn.prepareStatement(updateBankInfoTable);
                    stmtBank.setBytes(1,b);
                    stmtBank.setInt(2,bankId);
                    if (stmtBank.executeUpdate()==1)
                                             p.println("Updated ARBANKINFO table");
                    else
                                             p.println("*** Column not found in ARBANKINFO table : " +
                                   "BANKID--> "+bankId);
               if (stmtBank != null)
               stmtBank.close();
          if (stmtBrand != null)
               stmtBrand.close();
     }catch(Exception e)
          e.printStackTrace(p);
     if (stmt != null)
          stmt.close();
     if (stmtBank != null)
          stmtBank.close();
     if (stmtBrand != null)
          stmtBrand.close();
Any suggestions ?????

Answer 1

i don't see how not setting the autoCommit parameter
has anything to do with this.If autocommit is false then an update will not be committed without an explicit commit()!
>
I would like to add one more thing in here, which m
sorry i shud hav added; this particluar fn. does
update a lot of row; but for some records, althou it
does say that it has updated(java API ); but in
reality it does not do it.
That makes a lot fo difference! It does mean that it is probably not a commit problem but without this extra information my money was on a commit problem. Are you swallowing an exception without reporting it?