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Warning this post is not well formulated but has some useful random information :)

There has been alot of talk lately about people refactorring from the repository pattern to the Active Record pattern. For instance Sam Gentile brings it up here

How prevalent is this movement? I personally prefer the repository pattern over ActiveRecord for quite a few reasons.

  1.  My db objects and domain objects rarely match up.
  2.  I often use polymorphism on my repositories (especially for testing).
  3.  I can write a generic repository (reusing code for general methods such as Delete or FetchByQuery)
  4.  I can allow repository injection by the domain host.
  5. A Repository shows explicitly a decision to make the object an aggregate root 
  6. I use alot of AOP and its nice being able to place aspects on my repositories, this could not be done with active record's static methods
  7. ActiveRecord seems to defeat the entire concept of DDD, ActiveRecord promotes a database centric model

skeleton example of generic repository

public class Repository {
    public virtual List FetchByQuery(QueryObject _Query) {
    }
    public virtual void Save(T _Object) {
    }
    public virtual void Delete(T _Object) {
    }
}

I guess the big question in choosing which way to go is whether or not your object creations varies for a given object. If you only ever have a single repository then perhaps you are probably better off with the static accessors. Personally I prefer the seperation (and the code saving).


Unit Testing

The very concept of a repository is that it gives the impression of an in memory database. This works perfectly for unit testing as I can just use a repository that actually holds all of its data in memory for testing purposes! I can in fact even make a generic based one that can operate on my query objects using reflections.

also .. some interesting links I happenned accross:

http://www.xprogramming.com/xpmag/jatSustainablePace.htm 
http://www.joelonsoftware.com/items/2006/04/11.html
http://media.spikedhumor.com//805/zoomquilt.swf very dali'esque

Posted on Friday, April 28, 2006 5:21 AM | Back to top


Comments on this post: Repository vs ActiveRecord

# sharegyan:-share market tips
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Hi,

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Left by sharegyan.gyan on Aug 26, 2008 1:39 AM

# re: Repository vs ActiveRecord
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I have just checked this blog and I have found this to be very informative and useful. This blog must be very helpful to its visitors.

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Left by India Stock Tips on Jul 17, 2009 6:38 AM

# re: Repository vs ActiveRecord
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Excellent post and wonderful blog, I really like this type of interesting articles keep it up.

Stock market of India is volatile and all those who speculate in market are loosing everyday. Please remember stock market is not for speculation purpose. If one feel investing in stock market is gamble then its better to think again.

One should always note that if they want to invest money they should do proper research be it fundamental research or technical research. Just think how come you can invest
your money without any convincing reason for the same?



Thanks! For sharing …….


Option Tips

Left by Option Tips on Sep 21, 2010 3:56 AM

# re: Repository vs ActiveRecord
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I think the big advantage of the repository, is its inherent testability. The unit test are easy to write when you use a repository interface with dependency injection. It's inherent goodness, does not however translate into popularity. In a googlefight, Active Record beats Repository hands down. Clearly the battle for testable architecture has not yet been won.
Left by Free Mcx Tips Trial on Oct 26, 2010 5:59 AM

# re: Repository vs ActiveRecord
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Why don't you delete the robospam comments?
Left by Mikael on Nov 10, 2010 2:21 AM

# NSE and BSE tips – Sharetipsinfo
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Hi,
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Left by sharetipsinfo on Dec 04, 2010 1:09 AM

# re: Repository vs ActiveRecord
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Left by sharetipsinfo on Dec 06, 2010 9:33 PM

# Hello
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Left by Sureshot Tips on Dec 13, 2010 2:24 AM

# re: Repository vs ActiveRecord
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Hi , Very good information you are providing at here . Thanks for your knowledege , it vreally helps me a lot.
Regards
Anjali
Left by forex on Dec 18, 2010 5:05 AM

# re: Repository vs ActiveRecord
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Hey,
Nice and useful blog. It’s a fact that in India NSE and BSE are most popular and very volatile stock exchanges with many listed shares in it. Again its true no matter how volatile Share market is still investors can mint good profit.

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No matter how good trader or investor you are still one has to rely on market research. Only technical and fundamental research helps, speculation is not worth and no one can earn regular profit by speculations.



Regards
SHARETIPSINFO TEAM

Left by sharetipsinfo on Dec 28, 2010 1:29 AM

# re: Repository vs ActiveRecord
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Want to know more about unit testing.
Left by globalfinanceschool on Jan 06, 2011 12:41 AM

# Bse and Nse tips – Buzzingstreet
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Nice post. Its always better to think before investing money in stock market. Investment should be done in share market but with the aim to increase our funds so speculation should not be the mode of investment. Investors should know why they are investing money in any stock.
Regards
Left by buzzingstreet on Feb 18, 2011 12:39 AM

# re: Repository vs ActiveRecord
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Please delete the comment spam (including this post)!

Thanks,

Art
Left by Art on Mar 08, 2011 12:50 PM

# re: Repository vs ActiveRecord
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Stock market India is volatile and all those who speculate in market are loosing everyday. Please remember stock market is not for speculation purpose. If one feel investing in stock market is gamble then its better to think again.

One should always note that if they want to invest money they should do proper research be it fundamental research or technical research. Just think how come you can invest
your money without any convincing reason for the same?

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So grab good stocks and invest that’s the bottom line.

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Regards

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Left by stock tips on Apr 19, 2011 9:03 PM

# re: Repository vs ActiveRecord
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# Nifty Intraday Calls
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