setWasNullColumnIndex(columnIndex);
wasNullValid = true; wasNull = fields[columnIndex-1].isNull();
    private FBField getField(int columnIndex) throws SQLException {         if (columnIndex> xsqlvars.length)             throw new SQLException("invalid column index");/*            FBField thisField = FBField.createField(getXsqlvar(columnIndex));        if (thisField instanceof FBBlobField)            ((FBBlobField)thisField).setConnection(c);        else        if (thisField instanceof FBStringField)            ((FBStringField)thisField).setConnection(c);*/        setWasNullColumnIndex(columnIndex);        return fields[columnIndex-1];    }