The Wiert Corner – irregular stream of stuff

Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

  • My badges

  • Twitter Updates

    • RT @michaelbolton: 1) Your periodic reminder: a test is not something we *write*. We write text and programs. A test is an experiment you *… 25 minutes ago
    • RT @BiancaPrins: Voor ons allemaal, een #draadje om tot het einde te lezen..... Juist nu (Volgt nog meer in de komende dagen) https://t.co… 25 minutes ago
    • RT @McKayMSmith: 90) His entire life, Ben has chosen to place his faith in the law. “Law, not war” has been his motto for decades. “I hav… 26 minutes ago
    • RT @McKayMSmith: 82) “It's possible to take the most fundamental, strongly held ideas and change them. What makes people change? Sometimes… 27 minutes ago
    • RT @McKayMSmith: 65) “Now I will tell you something very profound, which I have learned after many years. War makes murderers out of otherw… 29 minutes ago
  • My Flickr Stream

  • Pages

  • All categories

  • Enter your email address to subscribe to this blog and receive notifications of new posts by email.

    Join 1,640 other followers

delphi – Why was TDataSource created originally? – Stack Overflow

Posted by jpluimers on 2019/03/14

From a while ago [WayBackdelphi – Why was TDataSource created originally? – Stack Overflow

5down voteaccepted

It is all about decoupling and indirection.

And with TDataSource there are two kinds of them:

  • Decoupling the master detail relations (TDataSource is in the same module as the TDataSets that are being bound; the detail TDataSet references the master TDataSet by pointing its’ MasterSource property to the TDataSource that points to the master TDataSet)
  • Decoupling the UI from the business layer (TDataSets are in a DataModule; TDataSource is on the Form/Frame which contains your UI controls, UI controls reference their DataSourceproperty).

Since many components can point to the same DataSource, you can quickly switch which underlying TDataSet they use by just flipping one TDataSource.DataSet property.

–jeroen

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

 
%d bloggers like this: