Used to determine if field value is NULL.
Syntax:
function FieldIsNull(aFieldIndex : integer) : boolean;overload;
function FieldIsNull(aFieldName : string) : boolean;overload;
Description:
FieldIsNull are used to determine if field value is NULL in active record. First implementation checks field by it index. Second implementation checks field by it name. FieldIsNull returns True if value of requested field is NULL in current record and false if value is not NULL.
See also: FieldValues property, FieldValueByFieldName() method