Why not ORM

Sep 24, 2010Download as ODP, PDF6 likes5,560 views

What do you need to keep in mind when using ORM, how it will affect your needs and what are the disadvantages of using and advantages of not using ORM.

Why not ORM? Michal Špaček, Skype; WebExpo 2010 , Prague

PHP/ORM guru , anyone ? 2010 © Skype – As seen on TV Slide

ORM… … maps relational databases to objects says František Tröster

ORM… … maps relational databases to objects says František Tröster … maps objects to relational databases says Jiří Knesl

ORM… … maps relational databases to objects says František Tröster … maps objects to relational databases says Jiří Knesl … is a technique for converting data between incompatible type systems in OOP languages says Wiki Pedia

Best thing since sliced bread . Or maybe not .

ORM is said to allow the database systems swap „ on the fly “…

Most of the times you'll end up changing bunch of other things too, so it's not that easy as it might seem .

ORM expert 2010 © Skype – As seen on TV Slide

Database system expert 2010 © Skype – As seen on TV Slide

Using ORM and want to refactor relations ?

Do it, pretty please, but you have to refactor code too…

… and you need to deploy all the changed stuff at once !

And what about accessing one database with several technologies? 2010 © Skype – As seen on TV Slide

Put your business logic into the database !

Issues solved ( all of them) 2010 © Skype – As seen on TV Slide

Database code can be tested separately from the rest of the code

Application code tests do not need a connection to the database

Forget explicit transactions ( BEGIN & COMMIT ) if you can has your codes wrapped in functions

Nice connection pooling 2010 © Skype – As seen on TV Slide

Every query can be executed on different machine

Add proxies… 2010 © Skype – As seen on TV Slide

… and get high performance clusters 2010 © Skype – As seen on TV Slide

Teams of database developers and admins …

… can monitor functions and their performance

… can redirect functions to be executed in different database when something goes horribly wrong

… are generally useless while using ORM http://www.xkcd.com/303/ ORM, DUDE!

… everything's possible! 2010 © Skype – As seen on TV Slide

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Why not ORM

1. Why not ORM? Michal Špaček, Skype; WebExpo 2010 , Prague

2. OMGWTF ORM ?

3. O bject- R elational M apping !

4. ORM, SRSLY ?

6. ORM… … maps relational databases to objects says František Tröster

7. ORM… … maps relational databases to objects says František Tröster … maps objects to relational databases says Jiří Knesl

8. ORM… … maps relational databases to objects says František Tröster … maps objects to relational databases says Jiří Knesl … is a technique for converting data between incompatible type systems in OOP languages says Wiki Pedia

9. ORM is like …

10. … TDD

11. Best thing since sliced bread . Or maybe not .

12. ORM is said to allow the database systems swap „ on the fly “…

14. … , but have anyone seen it, ever ?

15. Most of the times you'll end up changing bunch of other things too, so it's not that easy as it might seem .

16. When your O/R mapper goes bananas …

19. Using ORM and want to refactor relations ?

20. Do it, pretty please, but you have to refactor code too…

21. … and you need to deploy all the changed stuff at once !

23. Put your business logic into the database !

24.