code: public void updateCharacterStream(String arg0, Reader arg1, int arg2) throws SQLException {
          try {
              rsetImpl.updateCharacterStream(arg0, arg1, arg2);
          } catch (SQLException ex) {
              FFDCFilter.processException(ex, "com.ibm.ws.rsadapter.jdbc.WSJdbcResultSet.updateCharacterStream", "3317", this);
              throw WSJdbcUtil.mapException(this, ex);
          } catch (NullPointerException nullX) {
              // No FFDC code needed; we might be closed.
              throw runtimeXIfNotClosed(nullX);
          }
      }
docs: Updates a column with a character stream value. The updateXXX methods are used to update column
  values in the current row, or the insert row. The updateXXX methods do not update the underlying database; instead
  the updateRow or insertRow methods are called to update the database.
  
  @param columnName - the name of the column
  x - the new column value
  length - of the stream
  @throws SQLException if a database access error occurs.