question: public synchronized void updateNCharacterStream ( String columnName , java . io . Reader reader , int length ) throws SQLException { updateNCharacterStream ( findColumn ( columnName ) , reader , length ) ; }
target:  JDBC 4.0 Update 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.