delphi FDQuery获取字段类型

 ty := FieldTypeNames[FDQuery3.FieldDefList.FieldDefs[0].DataType];
  s := FDQuery3.Fields.Fields[0].FieldName;
  value := FDQuery3.Fields.FieldByNumber(1).AsString;

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var
  s: string;         //  TFieldDefs
  ty: string;
  value: string;
  Field: TField;
begin
  Field := FDQuery3.Fields[0];
  s := Field.FieldName;
  ty := FieldTypeNames[Field.DataType];
  value := Field.AsString;
  Memo1.Text := s + ' ' + ty + ' ' + value;