[PHP] Re: Web dev, DB and "proper db design".
On 7/4/2013 6:42 AM, Richard Quadling wrote: Hi. I've just had a conversation regarding DB, foreign keys and their benefits. I was told "I've never worked on a web application where foreign keys were used in the database". As someone who has spent 25 years working on accounting/epos systems on MS SQL Server (yep, windows) and now in a web environment and hearing the above, ... well, ... slightly concerned. So, in the biggest broadest terms, what do you lot do? DBs with no foreign keys (constrainted or not). ORM builders with manual definition of relationships between the tables. Inline SQL where you have to just remember all the relationships. Views for simple lookups? How do you handle updatable views (does mysql support them?) etc. Is there a difference in those in 'startups' and web only situations, or those doing more traditional development (split that as you like - I'm just trying to get an understanding and not go off on one!). No definitive answers, and I hope I get some wide experiences here. Thanks for looking. Richard. I"m going to guess that your source of such drivel never learned about such things. Probably thinks that a 'key' has to be defined as such in the db, whereas we know what a FK really is. Don't worry. As a former big iron guy and then a c/s guy and now a (new) web guy, things haven't changed. -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
[PHP] Re: Web dev, DB and "proper db design".
"Richard Quadling" wrote in message news:CAKUjMCWJ4wiUO904OvYkS53Fsg4PPXa=qbokcvhwfemcpkp...@mail.gmail.com... Hi. I've just had a conversation regarding DB, foreign keys and their benefits. I was told "I've never worked on a web application where foreign keys were used in the database". As someone who has spent 25 years working on accounting/epos systems on MS SQL Server (yep, windows) and now in a web environment and hearing the above, ... well, ... slightly concerned. So, in the biggest broadest terms, what do you lot do? DBs with no foreign keys (constrainted or not). ORM builders with manual definition of relationships between the tables. Inline SQL where you have to just remember all the relationships. Views for simple lookups? How do you handle updatable views (does mysql support them?) etc. Is there a difference in those in 'startups' and web only situations, or those doing more traditional development (split that as you like - I'm just trying to get an understanding and not go off on one!). No definitive answers, and I hope I get some wide experiences here. Thanks for looking. Richard. There is a difference between having a field which is used as a foreign key and having a foreign key constraint defined in the database. Remember that foreign keys can be used in SELECT statements without there being a FK constraint. Constraints are only used in INSERT/UPDATE/DELETE operations, and never used for SELECTs You cannot have relationships in a database without foreign keys, but you can have foreign keys with constraints. -- Tony Marston http://www.tonymarston.net http://www.radicore.org -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
