Channel 9 Forums - Tech Off - Creating DB independant DAL http://mschnlnine.vo.llnwd.net/d1/Dev/App_Themes/C9/images/feedimage.png Channel 9 Forums - Tech Off - Creating DB independant DAL http://channel9.msdn.com/Forums Channel 9 keeps you up to date with the latest news and behind the scenes info from Microsoft that developers love to keep up with. From LINQ to SilverLight – Watch videos and hear about all the cool technologies coming and the people behind them. http://channel9.msdn.com/Forums en Wed, 22 May 2013 02:29:02 GMT Wed, 22 May 2013 02:29:02 GMT Rev9 10 -10 -1 Tech Off - Creating DB independant DAL Hello Niners,

What's the best way to create a Database independent data abstraction layer?  I don't want to rely on stored procedures as I would want to be able to use MS Access.

Help is much appreciated. Thanks!


mVPstar

]]> http://channel9.msdn.com/Forums/TechOff/74779-Creating-DB-independant-DAL/74779#74779 Sat, 11 Jun 2005 20:45:57 GMT http://channel9.msdn.com/Forums/TechOff/74779-Creating-DB-independant-DAL/74779#74779 mVPstar 10 http://channel9.msdn.com/Niners/mVPstar/Discussions/RSS Tech Off - Creating DB independant DAL Using stored procedures is the one thing you need to avoid when trying to be DB indepedent because they're the only thing that differs appreciably between DBs.

There are other differences like cursor models, but since ADO.NET massively dumbed-down the whole concept of cursors to a lowest common denominator forward only model that difference went away.

The only other thing to worry about is obscure data-types that may not be present in all DBs.

]]> http://channel9.msdn.com/Forums/TechOff/74779-Creating-DB-independant-DAL/076cb83587a749a79e819dea0122451c#076cb83587a749a79e819dea0122451c Sat, 11 Jun 2005 21:00:19 GMT http://channel9.msdn.com/Forums/TechOff/74779-Creating-DB-independant-DAL/076cb83587a749a79e819dea0122451c#076cb83587a749a79e819dea0122451c rhm 10 http://channel9.msdn.com/Niners/rhm/Discussions/RSS Tech Off - Creating DB independant DAL you can use an abstract class.

public abstract class DALBase
{
public abstract int CreateSomething(Something s);
public abstract int CreateAnother(Thing t);
...etc
}

then you inherit from DALBase, so for Sql
public class Sql : DALBase
{
//define your stored procs here maybe?
public override int CreateSomething(Something s) { ...use stored procs... }
public override int CreateAnother(Thing t) { ...do your sql stuff here... }
}

public class Access : DALBase
{
//use t-sql
...
}

hope that makes sense

]]> http://channel9.msdn.com/Forums/TechOff/74779-Creating-DB-independant-DAL/b748788465eb4602b5759dea0122454d#b748788465eb4602b5759dea0122454d Sat, 11 Jun 2005 21:59:06 GMT http://channel9.msdn.com/Forums/TechOff/74779-Creating-DB-independant-DAL/b748788465eb4602b5759dea0122454d#b748788465eb4602b5759dea0122454d matrixr 10 http://channel9.msdn.com/Niners/matrixr/Discussions/RSS Tech Off - Creating DB independant DAL Abstract class was what I was thinking of before.

Are there any other good design patterns I can use?




mVPstar

]]> http://channel9.msdn.com/Forums/TechOff/74779-Creating-DB-independant-DAL/16161e89cdd9497eaaac9dea0122457c#16161e89cdd9497eaaac9dea0122457c Sat, 11 Jun 2005 22:08:40 GMT http://channel9.msdn.com/Forums/TechOff/74779-Creating-DB-independant-DAL/16161e89cdd9497eaaac9dea0122457c#16161e89cdd9497eaaac9dea0122457c mVPstar 10 http://channel9.msdn.com/Niners/mVPstar/Discussions/RSS Tech Off - Creating DB independant DAL I recommend checking out Enterprise Library 1.0 from Microsoft. Just search for "Enterprise Library" in MSDN, you'll find the download link.

It contains a Data Acccess Application Block, which is DB independent. And I think it contains a class named "CommandWrapper" for creating DB independent SP structure.

Regards,
Mert Sakarya
mertsakarya@hotmail.com

]]> http://channel9.msdn.com/Forums/TechOff/74779-Creating-DB-independant-DAL/bef04de6c2b545b4845a9dea012245ab#bef04de6c2b545b4845a9dea012245ab Sun, 12 Jun 2005 10:11:47 GMT http://channel9.msdn.com/Forums/TechOff/74779-Creating-DB-independant-DAL/bef04de6c2b545b4845a9dea012245ab#bef04de6c2b545b4845a9dea012245ab mertsakarya 10 http://channel9.msdn.com/Niners/mertsakarya/Discussions/RSS Tech Off - Creating DB independant DAL Wow. Thanks so much!

The other 6 application blocks will be very useful as well.


mVPstar

]]> http://channel9.msdn.com/Forums/TechOff/74779-Creating-DB-independant-DAL/2ee1e9b4bb3c465d9d569dea012245d9#2ee1e9b4bb3c465d9d569dea012245d9 Sun, 12 Jun 2005 12:51:01 GMT http://channel9.msdn.com/Forums/TechOff/74779-Creating-DB-independant-DAL/2ee1e9b4bb3c465d9d569dea012245d9#2ee1e9b4bb3c465d9d569dea012245d9 mVPstar 10 http://channel9.msdn.com/Niners/mVPstar/Discussions/RSS Tech Off - Creating DB independant DAL If your starting to look at .net 2.0
-- I am starting to switch to it now

then look at how 2.0 lets you bind to objects.


so you have a client useing objects with methods that do the CRUD at the object level.

then you can attach that to a set of data classes that deal with the back end store.

I have done a few tests and it seems that this will work very well ....

the app only sees the objects.

]]> http://channel9.msdn.com/Forums/TechOff/74779-Creating-DB-independant-DAL/4d64fa97085840e082f39dea01224608#4d64fa97085840e082f39dea01224608 Sun, 12 Jun 2005 13:07:43 GMT http://channel9.msdn.com/Forums/TechOff/74779-Creating-DB-independant-DAL/4d64fa97085840e082f39dea01224608#4d64fa97085840e082f39dea01224608 figuerres 10 http://channel9.msdn.com/Niners/figuerres/Discussions/RSS Tech Off - Creating DB independant DAL Can you please elaborate more on what you mean? I'm still much of a beginner.



mVPstar

]]> http://channel9.msdn.com/Forums/TechOff/74779-Creating-DB-independant-DAL/cfde36f843d7439cacbc9dea01224636#cfde36f843d7439cacbc9dea01224636 Sun, 12 Jun 2005 13:23:08 GMT http://channel9.msdn.com/Forums/TechOff/74779-Creating-DB-independant-DAL/cfde36f843d7439cacbc9dea01224636#cfde36f843d7439cacbc9dea01224636 mVPstar 10 http://channel9.msdn.com/Niners/mVPstar/Discussions/RSS Tech Off - Creating DB independant DAL
mVPstar wrote:
Can you please elaborate more on what you mean? I'm still much of a beginner.



mVPstar


do you have beta 2 of Visual STudio 2005 ?




]]> http://channel9.msdn.com/Forums/TechOff/74779-Creating-DB-independant-DAL/90ea1226965d4cbc90b29dea012246c0#90ea1226965d4cbc90b29dea012246c0 Sun, 12 Jun 2005 14:32:54 GMT http://channel9.msdn.com/Forums/TechOff/74779-Creating-DB-independant-DAL/90ea1226965d4cbc90b29dea012246c0#90ea1226965d4cbc90b29dea012246c0 figuerres 10 http://channel9.msdn.com/Niners/figuerres/Discussions/RSS Tech Off - Creating DB independant DAL I now do.



mVPstar

]]> http://channel9.msdn.com/Forums/TechOff/74779-Creating-DB-independant-DAL/aca2788f48e84b34b0949dea012246ef#aca2788f48e84b34b0949dea012246ef Mon, 13 Jun 2005 18:58:25 GMT http://channel9.msdn.com/Forums/TechOff/74779-Creating-DB-independant-DAL/aca2788f48e84b34b0949dea012246ef#aca2788f48e84b34b0949dea012246ef mVPstar 10 http://channel9.msdn.com/Niners/mVPstar/Discussions/RSS