BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Linking Business Objects and Visual components?          BorlandTalk.com Forum Index -> Delphi OO design View previous topic :: View next topic   Author Message Rob Guest Posted: Fri Jan 16, 2004 3:58 am    Post subject: Linking Business Objects and Visual components? I have been thinking about how I can link a business object with a visual DB component, but was wondering how others have approached the idea? I would like to somehow link a business object, say TCustomer (as a back end style object - so it can be used elsewhere) with the power of using visual DB style grids/editors on the front end - maybe trying to get the best of both worlds? How do others do it? Or is it best to stick to one "style" or the other? TIA Rob --- posted by geoForum on http://delphi.newswhat.com Back to top DB Developer 4 Hire Guest Posted: Fri Jan 16, 2004 4:48 am    Post subject: Re: Linking Business Objects and Visual components? Well you could try instantobjects which has just gone open source. "Rob" <andrew_rob (AT) hotmail (DOT) com> wrote Quote: I have been thinking about how I can link a business object with a visual DB component, but was wondering how others have approached the idea? I would like to somehow link a business object, say TCustomer (as a back end style object - so it can be used elsewhere) with the power of using visual DB style grids/editors on the front end - maybe trying to get the best of both worlds? How do others do it? Or is it best to stick to one "style" or the other? TIA Rob --- posted by geoForum on http://delphi.newswhat.com Back to top Joanna Carter (TeamB) Guest Posted: Fri Jan 16, 2004 8:41 am    Post subject: Re: Linking Business Objects and Visual components? Rob wrote: Quote: I have been thinking about how I can link a business object with a visual DB component, but was wondering how others have approached the idea? I would like to somehow link a business object, say TCustomer (as a back end style object - so it can be used elsewhere) with the power of using visual DB style grids/editors on the front end - maybe trying to get the best of both worlds? IMO DB components can introduce more problems than they can solve. They rely on a series of events which interact with the dataset they are connected to; and some of these events can happen when you don't want them to. e.g. if you move away from certain controls, they try to post the value in the edit back to the dataset, not always what is wanted. I have seen more kludge code expended on trying to circumvent the event system than real business logic :-( Take a look at the articles on MVP on my website: www.carterconsulting.org.uk for ideas on how to create object-aware controls. Come back to here if you have any questions. Joanna -- Joanna Carter (TeamB) Consultant Software Engineer TeamBUG support for UK-BUG TeamMM support for ModelMaker Back to top Andrew Denton Guest Posted: Fri Jan 16, 2004 8:58 am    Post subject: Re: Linking Business Objects and Visual components? Rob wrote: Quote: I have been thinking about how I can link a business object with a visual DB component, but was wondering how others have approached the idea? I would like to somehow link a business object, say TCustomer (as a back end style object - so it can be used elsewhere) with the power of using visual DB style grids/editors on the front end - maybe trying to get the best of both worlds? How do others do it? Or is it best to stick to one "style" or the other? TIA Rob --- posted by geoForum on http://delphi.newswhat.com Hi Rob, tiOPF has an object Dataset which allows you to connect your business objects to data-aware controls should you so wish. http://www.techinsite.com.au -- Cheers, Andy "I want to move to Theory....Everything works in Theory" Back to top Paul Guest Posted: Fri Jan 16, 2004 9:37 am    Post subject: Re: Linking Business Objects and Visual components? "Rob" <andrew_rob (AT) hotmail (DOT) com> wrote Quote: I have been thinking about how I can link a business object with a visual DB component, but was wondering how others have approached the idea? You could create a dataset descendent that uses your BO as the source for it's records. Gerald Nunn wrote some articals on how to do this. I believe that Joanna Carter also wrote some articals on this subject. Quote: I would like to somehow link a business object, say TCustomer (as a back end style object - so it can be used elsewhere) with the power of using visual DB style grids/editors on the front end - maybe trying to get the best of both worlds? How do others do it? Or is it best to stick to one "style" or the other? It is not so much sticking to one style in your architecture. I would say that it is more important to once you have found a usable architecture make sure that it is applied consistently across the applications that use it. If it is not then your architecture is redundant and just adding to the complexity of the application not reducing it. regards Paul Back to top Trevor de Koekkoek Guest Posted: Fri Jan 16, 2004 3:02 pm    Post subject: Re: Linking Business Objects and Visual components? I've created an object dataset in the past and it works quite well. In my opinion this is a good way to go as you don't want or need to create your own databinding mechanism. Another option is to use the excellent components from Developer Express. Their data-binding mechanism allows you bind with or without datasets. -Trevor "Rob" <andrew_rob (AT) hotmail (DOT) com> wrote Quote: I have been thinking about how I can link a business object with a visual DB component, but was wondering how others have approached the idea? I would like to somehow link a business object, say TCustomer (as a back end style object - so it can be used elsewhere) with the power of using visual DB style grids/editors on the front end - maybe trying to get the best of both worlds? How do others do it? Or is it best to stick to one "style" or the other? TIA Rob --- posted by geoForum on http://delphi.newswhat.com Back to top Steffan Surdek Guest Posted: Tue Jan 20, 2004 2:07 pm    Post subject: Re: Linking Business Objects and Visual components? Rob, I've done a combination of things... I have some object aware controls for the basics (i.e.: TEdit, TRadioButton, TCheckbox, TComboBox type controls). These controls are aware of my business objects and how to interface with them to set / retrieve values. If you change the value of an object directly in code, the visual control is automatically updated. One of my objects is a generic container that contains a list of field names and data similar to retrieving data from a TDataset. For this container, I convert the data to a memory dataset and then I can use a db grid to populate the data. Once I'm done editing the data, I repackage it in the object and do whatever I need to do. This is not as elegant as the object aware controls but it is only for specific cases where this data needs to be edited but it works fine for my purposes at the moment. The main benefit of doing it this way for the lists of data is that I can use a nice DB aware grid like QuantumGrid to browse / edit the data in different ways. Steffan "Rob" <andrew_rob (AT) hotmail (DOT) com> wrote Quote: I have been thinking about how I can link a business object with a visual DB component, but was wondering how others have approached the idea? I would like to somehow link a business object, say TCustomer (as a back end style object - so it can be used elsewhere) with the power of using visual DB style grids/editors on the front end - maybe trying to get the best of both worlds? How do others do it? Or is it best to stick to one "style" or the other? 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