Rather important thing in Web server application

[egsuh]

I'm not quite sure about what I'm trying to talk now, but based on many experimentation, I have following conclusion.

In web-server application, you have to avoide using global-scope variables. You can have more than one datamodules (including webmodule) in Lazarus, which is not allowed in Delphi (at least up to Delphi 7).

Let's assume that you have one webmodule and one normat datamodule and the latter has database connections and related methods operating on the database.

I listed up structure normally created, but think that the variable of the datamodule must be declared within web-module, as explained in the comments. 

Code: Pascal  [Select][+][-]

1. unit wm_unit;
2. interface
3.  
4. uses dm_unit;
5.  
6.  type
7.     Twm1 = class(TFPWebModule)
8.            .......
9.  
10.     private
11.         wdm1 : Tdm1;   // You have to define the variable here.
12.     end;
13.  
14. var
15.    wm1: Twm1;    // Actually this variable seems never used.  
16.  
17. implementation
18.     .....
19.  
20. procedure Twm1.DataModuleCreate(Sender: TObject);
21. begin
22.     wdm1 := Tdm1.Create(Self);         // And Created here
23. end;
24.  
25. procedure Twm1.DataModuleDestroy (Sender: TObject);
26. begin
27.      wdm1.Free;    // Freed here. But I think this is not necessary as it is owned by Self.
28. end;
29.  
30. initialization
31.    RegisterHTTPModule('wm1', Twm!);
32. end.
33.  
34.  
35. // ----------------------- Data Module  
36. unit dm_unit;
37. interface
38.  
39.  type
40.     Tdm1 = class(TDataModule)
41.            .......
42.     end;
43.  
44. var
45.    dm1: Tdm!;            // this variable SHOULD NOT be used.
46. implementation
47.     .....
48. end.
49.  

 Please anyone advise me if I'm wrong.

[Thaddy]

I seriously advice you to play "Oh, well"

Code: Pascal  [Select][+][-]

1. var
2.    dm1: Tdm!;            // this variable SHOULD NOT be used.
3.  

As is the exclamation mark.........................................................................
Writing invalid code is easy.