Tells if value has been marked as being invalid by gda.row.Row.invalidateValue. This method is mainly used by database providers' implementations to report any error while reading a value from the database.
a #GValue belonging to row (obtained with gda.row.Row.getValue).
true if value is valid
ErrorWrap
Tells if value has been marked as being invalid by gda.row.Row.invalidateValue. This method is mainly used by database providers' implementations to report any error while reading a value from the database.