Creating a Delphi Class as TDataModule ?

[Abaksoft]

Dear Friends,

In my old Unigui project i notice a strange behavior:   store differences (item movements)
Probably an error on my part regarding SQL queries or Server power cuts.

However, I noticed, today to my dismay, that my Class was declared as TDataModule
and not TUniGUIMainModule (which is multi Sessions).

Could my store gap problem have come from there?
In other words:  will we now have to declare with Unigui all our classes :

  TMyclasse = class (TUniGUIMainModule)   ?
    .....
  end;

 

and not in

  TMyclasse = class (TDataModule)
    .....
  end;

______________

Note : The application is Multi users environment.

Edit :  My old Class (TDataModule)  contain Concurrent SQL queries !!!

Big Thx

[Abaksoft]

Auto answer : 

1. we have to use TDataModule generated by Unigui Application.

2. Conserning my store gab problem, i found that i am using the same DBQuery component on mainModule, for all concurrent queries sessions (a bad old habit)

The safe way is to create on the fly DBQuery inside a trandaction and free it at the end.

sorry for any enconvenience.

 

 

 

[Wilton Ergon]

this should not be a problem, as the mainmodule is instantiated for each user, so your bdquery would have an instance for each user.

[Abaksoft]

Thank you wilton_rad,

I will diagnose others portions code.

 

[Abaksoft]

Fixed.

A catastrophic procedure a writed, was the cause. Sometimes my brain works at 3℅. 

Sorry for the alert.