What pattern use? How to use these patterns in Delphi XE 3? Developing new
My firwst post here, and i REALLY need yours help...
My main objective is to create a _*standard system to register products, clients, sell items, control stock*_, and so on.
I want to use *Multi Tier, using Datasnap*, I dont want the classic client-server systems. There are several considerations I would like to discuss:
1 - I really want to do a *GOOD system, using patters* to make easier maintenance. I have read about MVC, saw some examples, but I read examples using Interfaces, and other posts in internet say Interfaces are bad. *MVC is good for this kind of system*?
2 - I want to separate my system, *I DONT want to use database related things* (save, update, delete) in the form, I am thinking in this kind of structure:
TProductModel = Class
FDescription: string;
FPrice: double;
public
Properties....
end;
TProductDao = Class
public
function Save(pProductModel: TProductModel): boolean; // Gonna save the information to database...
end;
TProductForm = TForm
..
..
..
procedure btnok_Click();
var
oProductDao: TProductDao;
oProductModel: TProductModel;
begin
oProductDao := TProductDao.Create;
oProductModel := TProductModel;
oProductModel.Description := 'Product number 1';
oProductModel.Price = 99.99;
oProductDao.Save(oProductModel);
end;
* What could you suggest to me about this kind of things, what could I Do? *
3 - _*May I use TClientDataSet with good patterns like MVC?*_ How could I Implement the database commands using good patterns? in my "Controller" classes...
Observation: I want to make a easy maintenance system, I dont need to use PURE MVC, i would like to make some simple code, with good maintenance in future. I would love to have a donk view interface, I would like to put all my code in a class between Server and User, but how _*Can I enjoy all RAD power provided by Delphi XE3,*_ and still using patterns?
--
Manoel Ribeiro from Santa Catarina - Brazil.
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manoel
2/25/2013 2:27:33 AM
embarcadero.delphi.oodesign
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I hate to say this, Manoel, but you're trying to re-create the client'server scheme by -- um, not using the obvious scheme. If you have an idea HOW to do what you want, you may make a zillion cruzeiros. Otherwise, you'd be better off using the well-tested and well-understood client-server relational DB pattern. -- Ol' Tred
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John
2/25/2013 4:01:14 AM
> {quote:title=John Treder wrote:}{quote}
> I hate to say this, Manoel, but you're trying to re-create the client'server scheme by -- um, not using the obvious scheme.
> If you have an idea HOW to do what you want, you may make a zillion cruzeiros. Otherwise, you'd be better off using the well-tested and well-understood client-server relational DB pattern.
>
> --
> Ol' Tred
ok, i do not want to use client-server, how do I implement MVC in Delphi XE3, WITHOUT interfaces, or interfaces is the right way?
--
Manoel Ribeiro from Santa Catarina - Brazil.
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manoel
2/25/2013 12:40:33 PM
> {quote:title=manoel ribeiro wrote:}{quote}
>
> ok, i do not want to use client-server, how do I implement MVC in Delphi XE3, WITHOUT interfaces, or interfaces is the right way?
Use the visual tools in Delphi the way they were intended. Use the datasnap or other remote library componets as they were designed.
Don't reinvent the wheel. You're creating a business application not an MVC framework product. You want to get your product to market as quickly as possible.
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Rich
2/25/2013 5:55:33 PM
manoel ribeiro wrote: > > ok, i do not want to use client-server, how do I implement MVC in Delphi XE3, WITHOUT interfaces, or interfaces is the right way? MVC and client-server are two different concepts. Although Delphi has all the tools necessary to write and apply an MVC framework, it isn't built in. As _Rich says, you're better off to use Delphi's tools directly to get an application out to the customer. I would advise, however, writing "business" classes to handle the business aspects of your application, and keeping as much non-user-interface code as possible out of the forms. I think there are commercial MVC frameworks that work with Delphi, but I haven't used any myself. -- Tredmill
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John
2/25/2013 6:07:55 PM
> {quote:title=John Treder wrote:}{quote}
> manoel ribeiro wrote:
>
> >
> > ok, i do not want to use client-server, how do I implement MVC in Delphi XE3, WITHOUT interfaces, or interfaces is the right way?
>
> MVC and client-server are two different concepts. Although Delphi has all the tools necessary to write and apply an MVC framework, it isn't built in.
> As _Rich says, you're better off to use Delphi's tools directly to get an application out to the customer.
> I would advise, however, writing "business" classes to handle the business aspects of your application, and keeping as much non-user-interface code as possible out of the forms.
> I think there are commercial MVC frameworks that work with Delphi, but I haven't used any myself.
>
> --
> Tredmill
OK guys i guess i understood it.
Well I really know how to work client-server, I want to make diference, there are several programs like the one I want to create in Brazil, but i will do it Better!!!
I Guess I will use Factory DAO (I use it in my actual work) to create objects.
I will remember how to use DataSet´s (I use direct SQL commands actually). And lets see what happens.
Thanks for the answers.
--
Manoel Ribeiro from Santa Catarina - Brazil.
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manoel
2/25/2013 6:36:08 PM
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