code: @Override
      public long position(String searchstr, long start) throws SQLException {
  	return stringData.indexOf(searchstr, (int) start);
      }
docs: Retrieves the character position at which the specified string <code>searchstr</code> begins
  within the <code>CLOB</code> value that this <code>Clob</code> object represents. The search for
  <code>searchstr</code> begins at position <code>start</code>.
  
  @param searchstr the byte array for which to search
  @param start the position at which to begin searching; the first position is 1
  @return the position at which the pattern appears, else -1
  @exception SQLException if there is an error accessing the <code>CLOB</code>