BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  is it good to use trigger, my teacher advise not to.          BorlandTalk.com Forum Index -> Delphi Databases (SQL Servers) View previous topic :: View next topic   Author Message tony Guest Posted: Sat Apr 24, 2004 3:24 am    Post subject: is it good to use trigger, my teacher advise not to. is it good practice to use trigger, my lecturer advise not to? he said it is going to impose a lot of trap for other team member in the programming team. Is it true? Any comment about the pros & cons? Back to top Bill Todd (TeamB) Guest Posted: Sat Apr 24, 2004 1:24 pm    Post subject: Re: is it good to use trigger, my teacher advise not to. On Sat, 24 Apr 2004 11:24:00 +0800, "tony" <ahbone (AT) hotmail (DOT) com> wrote: Quote: is it good practice to use trigger, In my opinion triggers are a good thing. They reduce network traffic, improve performance and centralize code in the database so that the same functionality is available to every application that uses the database. -- Bill (TeamB) (TeamB cannot respond to questions received via email) Back to top Bob Dawson Guest Posted: Sat Apr 24, 2004 1:57 pm    Post subject: Re: is it good to use trigger, my teacher advise not to. "tony" wrote Quote: is it good practice to use trigger, my lecturer advise not to? he said it is going to impose a lot of trap for other team member The caution is proper--the presence of an unsuspected trigger can make writing correct statements (and debugging wrong ones) quite difficult. The conclusion (don't use triggers) is wrong. Like Bill Todd says, triggers have important advantages in reducing network traffic and simplifying client side code by centralizing some logic. A better conclusion would be that SQL should only be written by the programmers who understand (or know how to investigate) the db design--just knowing the table structures isn't sufficient. Pragmatic advise: don't use triggers in work done for this lecturer's class. bobD Back to top Phil Shrimpton Guest Posted: Sat Apr 24, 2004 2:01 pm    Post subject: Re: is it good to use trigger, my teacher advise not to. In article <4089dbfb (AT) newsgroups (DOT) borland.com>, [email]ahbone (AT) hotmail (DOT) com[/email] says... Hi, Quote: is it good practice to use trigger Triggers are a good thing, and need not be avoided. One thing to make sure of is that triggers (and SPs) contain only 'DataLogic' and not 'BusinessLogic' or you app will become difficult to maintain. Phil -- Discover a lost art - play Marbles May 2004 www.marillion.com Back to top G. Allen Casteran Guest Posted: Sat Apr 24, 2004 7:02 pm    Post subject: Re: is it good to use trigger, my teacher advise not to. In article <4089dbfb (AT) newsgroups (DOT) borland.com>, [email]ahbone (AT) hotmail (DOT) com[/email] says... Quote: is it good practice to use trigger, my lecturer advise not to? he said it is going to impose a lot of trap for other team member in the programming team. Is it true? Any comment about the pros & cons? As you have seen by now your instrutor's views and the real world are vastly different. Welcome to the paradox of academia vs. real world. Get used to it! Take things you learn at school as concepts. Some are good and used regularly -- others (esp. when it is prefaced as an opinion) are not and should be discarded as flawed theories. I used to ask instructors for real world examples to justify such positions. Any teacher who does really know their stuff, will gladly give you such examples to back up their theory. If they get testy and insulted that you should ask such a question, you know where to put thier opinions. :) Allen. Back to top Tony Boxer Guest Posted: Sun Apr 25, 2004 5:55 am    Post subject: Re: is it good to use trigger, my teacher advise not to. Triggers make a lot of sense, but if you use triggers you should put comments in your code to indicate what the SQL trigger is doing. That should hopefully keep some other programmer from getting surprised. Assuming they bother to read your comments, of course. Tony "G. Allen Casteran" <allen (AT) nisinc (DOT) com> wrote Quote: In article <4089dbfb (AT) newsgroups (DOT) borland.com>, [email]ahbone (AT) hotmail (DOT) com[/email] says... is it good practice to use trigger, my lecturer advise not to? he said it is going to impose a lot of trap for other team member in the programming team. Is it true? Any comment about the pros & cons? As you have seen by now your instrutor's views and the real world are vastly different. Welcome to the paradox of academia vs. real world. Get used to it! Take things you learn at school as concepts. Some are good and used regularly -- others (esp. when it is prefaced as an opinion) are not and should be discarded as flawed theories. I used to ask instructors for real world examples to justify such positions. Any teacher who does really know their stuff, will gladly give you such examples to back up their theory. If they get testy and insulted that you should ask such a question, you know where to put thier opinions. :) Allen. Back to top Heiko Luettge Guest Posted: Mon Apr 26, 2004 3:02 pm    Post subject: Re: is it good to use trigger, my teacher advise not to. Hi, well put business logic into the database is OK I think. Example: Personal numbers must be positive. If the app checks this before insert into the database, is ok. But what if someone wrote a second app and forget to check it. After all the database can check the rule and avoid the insert. Of cause the appliation has to know, that a insert can fails. The next thing is, what happens if a business rule is changed ? Recompile all apps that work with the database... The main disadvantage I admit is the different syntax in different databases. Heiko PS: I moved from Paradox to Interbase 2 years ago. 2 years ago I did not know triggers ;) Back to top Del Murray Guest Posted: Mon Apr 26, 2004 6:16 pm    Post subject: Re: is it good to use trigger, my teacher advise not to. 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