public void updateAsciiStream(String columnName,
                                 java.io.InputStream x,
                                 int length) throws SQLException {
      updateAsciiStream(getColIdxByName(columnName), x, length);
   }
Sets the designated column in either the current row or the insert
row of this <code>StreamingRowSetImpl</code> object with the given
ASCII stream value.
<P>
This method updates a column value in either the current row or
the insert row of this rowset, but it does not update the
database.  If the cursor is on a row in the rowset, the
method {@link #updateRow} must be called to update the database.
If the cursor is on the insert row, the method {@link #insertRow}
must be called, which will insert the new row into both this rowset
and the database. Both of these methods must be called before the
cursor moves to another row.

@param columnName a <code>String</code> object that must match the
       SQL name of a column in this rowset, ignoring case
@param x the new column value
@param length the number of one-byte ASCII characters in the stream
src/main/java/org/replicadb/rowset/StreamingRowSetImpl.java