public void updateNCharacterStream(String columnName,
                            Reader x,
                            long length)
                            throws SQLException {
          throw new SQLFeatureNotSupportedException(resBundle.handleGetObject("jdbcrowsetimpl.featnotsupp").toString());
       }
Updates the designated column with a character stream value, which will
have the specified number of bytes. The driver does the necessary conversion
from Java character format to the national character set in the database.
It is intended for use when updating NCHAR,NVARCHAR and LONGNVARCHAR columns.
The updater methods are used to update column values in the current row or
the insert row. The updater methods do not update the underlying database;
instead the updateRow or insertRow methods are called to update the database.

@param columnName - name of the Column
@param x - the new column value
@param length - the length of the stream
@exception SQLException if a database access error occurs
@since 1.6
src/main/java/org/replicadb/rowset/sun/rowset/JdbcRowSetImpl.java