mORMot Open Source

uian2000

Member

Registered: 2014-05-06

Posts: 68

How dose SetFieldType work to enumerate type

Guys

I've implemented a  interface based service, and retrieve data with TDocVariant type param.
When display this data, field type missed. I've tried Table.SetFieldType, but colum value disappeared. T_T

Here is the sample code. Enviroment: Win7/X64/XE2

unit uMain;

interface

uses
  Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
  Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.Grids, Vcl.StdCtrls;

type
  TForm1 = class(TForm)
    DrawGrid1: TDrawGrid;
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

uses
  SynCommons,
  mORMot,
  mORMotUI;

type
  TEnumSample = (esOne, esTwo, esThree);
  TSQLMyRecord = class(TSQLRecord)
  private
    fSample: TEnumSample;
  published
    property Sample: TEnumSample read fSample write fSample;
  end;

procedure TForm1.Button1Click(Sender: TObject);
const
  MaxCount = 10;
var
  oTable, oRow: Variant;
  iIdx, iHigh: Integer;
begin
  oTable := _Arr([]);
  oRow := _Obj([]);
  for iIdx := 0 to MaxCount do
  begin
    iHigh := Ord(esThree) + 1;
    oRow.Sample := TEnumSample(iIdx mod iHigh);
    oTable._ := oRow;
  end;

  with TSQLTableToGrid.Create(DrawGrid1,
    TSQLTableJSON.Create('', VariantSaveJSON(oTable)), nil) do
  begin
    Table.SetFieldType('Sample', sftEnumerate, TypeInfo(TEnumSample));
  end;
end;

end.

Last edited by uian2000 (2014-08-26 12:11:24)

ab

Administrator

From: France

Registered: 2010-06-21

Posts: 14,206

Website

Re: How dose SetFieldType work to enumerate type

In fact, current implementation expected the following expression:

Table.SetFieldType('Sample', sftEnumerate, PTypeInfo(TypeInfo(TEnumSample))^.EnumBaseType);

which was indeed a bit confusing, I understand!

I've modified SetFieldType() to accept the raw TypeInfo() pointer, as you did expect.
See http://synopse.info/fossil/info/d8ba1796c8
It will work for both enumerates and sets.

Thanks for the feedback.
With a little sample project to reproduce the issue, it is just perfect!

uian2000

Member

Registered: 2014-05-06

Posts: 68

Re: How dose SetFieldType work to enumerate type

Thanks ab!

It's very kind of you to improve expression so quickly!
Thanks for your work. It's awesome!

Last edited by uian2000 (2014-08-26 16:43:16)