Having a generic repository does not offset the penalties of hacking around SELECT N+1s or managing child collections. Subscribe to access expert insight on business technology - in an ad-free environment. By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. It isn't until you realise that you have just put another layer on top of NHibernate or the Entity Framework you realise it's all gone Pete Tong. For instance, most pattern approaches, especially ones that rely on polymorphism, are slightly slower than an equivalent solution that does not encourage reuse. Please help identify this LEGO set that has owls and snakes? How does difficulty affect the game in Cyberpunk 2077? This gets worse as you have more and more methods and complex searches - you would end up with having a repository that would closely map with the persistent storage layer in use underneath. Lack of per-project access control – With split repositories, access to a repository can be granted based upon need. Regardless, the idea behind the repository pattern is that whatever sits behind it doesn’t matter so long as the API it provides works for the layer of the application calling into it. So, if your models are Dogs, Cats, and Rats, you would have a Repository for each, the DogRepository would not call anything in the CatRepository, an… In using the Repository design pattern, you can hide the details of how the data is eventually stored or retrieved to and from the data store. – Piotr Migdal Mar 22 '14 at 21:12 The intent of the repository pattern should be to abstract the persistence logic and hide the internal implementations of how the data is persisted. However, this may be trivial compared to the time saved using the pattern. ). Interactions or communication between the data accessors is only through the data stor… The Repository Pattern has gained quite a bit of popularity since it was first introduced as a part of Domain-Driven Design in 2004. Ubuntu uses the dpkg/apt package management system from debian with Ubuntu's own repositories. Ideally, the domain layer should not have any knowledge of the persistence logic. Disadvantages Because of being more vulnerable to failure and data replication or duplication, Repository Architecture Style has following disadvantages − High dependency between data structure of data store and its agents. MVC stands for Model-View-Controller. It represents the current state. Thanks for contributing an answer to Stack Overflow! 4 Common Mistakes with the Repository Pattern. You can model all your domain objects the same way. One of the main reasons to create a repository is to decouple the data access from the data store. A Repository pattern is a design pattern that mediates data from and to the Domain and Data Access Layers ( like Entity Framework Core / Dapper). In my opinion, using a generic repository is generalization too far. That logic can be defined using Repository pattern. UML Diagram Data Access Object Pattern. The Repository pattern is used to decouple the business logic and the data access layers in your application. This was the first tutorial that mentioned using a Repository as a layer between your controller and your database. a) The main disadvantage would be performance, I think. There are two types of components − 1. A data accessoror a collection of independent components that operate on the central data store, perform computations, and might put back the results. Let's get started! A popular pattern for ORM data access is the Repository pattern. Basically Repository pattern is a mediator between two layers. A central datastructure or data store or data repository, which is responsible for providing permanent data storage. On GitHub (for academic email) still you get a discount or free repos, see education.github.com. If you were to alter the implementation to inject (take the db parameter in the constructor for instance), you would only need one database no matter which repository implementation you choose. It's a bad idea to abstract calls to Entity Framework using a generic repository. If there is any schema change in database FE won’t work!!! We've all seen the generic base class used in example repository pattern implementations but this is to make things DRY (Don't-Repeat-Yourself) by inheriting from the base class ( GenericRepository in your case) to more specialized child classes. You cannot have a repository that is generic and one that can contain operations that can fit in any scenario. To learn more, see our tips on writing great answers. If you are using repository pattern - no, you should not return IQueryable. design pattern to create Object Repository for web UI elements I have previously used a so called "Generic" repository as you have described and thought it was great. Why is the head of the Department of Justice not called the Secretary of Justice? Each design decision must be considered individually. How to play computer from a particular position on chess.com app. Only using the generic, base class GenericRepository assumes that your repositories will only ever need the most basic CRUD methods. It can even be a collection of SQL statements. A generic repository doesn't define a meaningful contract and you would again need a specific repository that extends your generic repository and provides the specific set of operations that are meaningful to that particular entity. If you go down the road of a Generic Repository you will end up with duplication in your queries and you will find it much harder to unit test the code that uses the repository as you will have to test the queries as well. |. Design components. While the former models behavior, i.e., models the real-life problems and the solutions to those problems, the latter is used to model how the application's data is actually stored in the data store. The Repository pattern is used to decouple the business logic and the data access layers in your application. – Arnis Lapsa Mar 26 '13 at 23:07. GitHub does offer private repositories, but this isn’t necessarily perfect for many. The repository pattern has recently taken on a life of its own in the echo chamber of PHP architecture and development blogs. site design / logo © 2020 Stack Exchange Inc; user contributions licensed under cc by-sa. The Repository pattern may be beneficial where you have many entities and have many complex queries to work with those entities. Do I have to pay capital gains tax if proceeds were immediately used for another investment? Repositories are classes that hide the logics required to store or retreive data. Copyright © 2020 IDG Communications, Inc. However, it's just another anti pattern and is used frequently with Entity Framework to abstract calls to the data access layer. The big disadvantage of EF is rigid architecture which can be hardly mocked, so if you want to unit test upper layer you must wrap EF somehow to allow mocking its implementation. Before I jump into the exploration of The Repository Pattern, first we should look back at the two previous posts in this series that also mention the use of Repositories.The first mention of Repositories was in the post Creating flexible Controllers in Laravel 4 using Repositories. I have yet to find a project where I either needed to change persistence technologies or where doing so would not affect the domain drastically anyway. Essentially, it provides an abstraction of data, so that your application can work with a simple abstraction that has an interface approximating that of a collection. How to implement the repository pattern the right way? Is air to air refuelling possible at "cruising altitude"? Repository is a design pattern which introduces concept of storing collections of specific types. It is an architecture or a software design pattern that makes creating huge applications easy. An extra layer of abstraction in this case can help you to eliminate duplication of query logic. However, this may be trivial compared to the time saved using the pattern. You could use Repository to manage data from all sorts of sources, whether they be entity, linq, ADO.NET, file system data storage, xml, webservices, whatever. Here’s another drawback of this approach: The basic intent of the repository pattern is to decouple your domain layer from how the data is actually persisted by the data access layer. This leads to a loss of per-project semantic versioning. Why to use the Repository Pattern ? Disadvantages: You have to think in a non-traditional way of handling data , not available for every database. Would France and other EU countries have been able to block freight traffic from the UK if the UK was still in the EU? Hi looking at the repository pattern which commonly seems to be implemented something like: So for every type you want to work with (ie update) you need to instantiate a repository. It does not belong to specific programming language or framework, but it is a concept that you can use in creating any kind of application or … Repository Pattern Sometimes, it is required to define some logic between our business logic and data access logic. Here’s another drawback of this approach: The basic intent of the repository pattern is to decouple your domain layer from how the data is actually persisted by the data access layer. (Like switching from a relational to a document db would fundamentally alter the way you use persistence.) It's supposed to provide you an encapsulation on the way that data is actually persisted in the data storage layer. In short: BitBucket offers unlimited number of free private repositories for people with academic email. Surely wouldn't it be better to have something like: This means the repository only needs to be instantiated once and therefore is truely generic? What's an uncumbersome way to translate "[he was not] that much of a cartoon supervillain" into Spanish? Stack Overflow for Teams is a private, secure spot for you and For example, if you have an […] 2. 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This answer is not useful. The Advantages and Disadvantages of Using GitHub. A data source can also be another system service or some kind of repository. BTW: See Internet Git repository for collaboration on a paper. Faster development process: MVC supports rapid and parallel development. Similarly, you may ask, what are the benefits of using the Repository pattern laravel? ... OODBMS, XML repository, flat file system, and so forth. We are going to discuss the one of the most widely used a pattern called Repository Pattern. InfoWorld This data store can be a database, an xml file, etc. What fraction of the larger semicircle is filled? In using the Repository design pattern, the business logic layer of your application need not have any knowledge on how data persistence happens beneath. The operations of the repository should be expressive enough and not be generic. We are going to discuss the one of the most widely used a pattern called Repository Pattern. your coworkers to find and share information. Therefore I will combine them in this post and show how to implement them both. Asking for help, clarification, or responding to other answers. Changes in data structure highly affect the clients. Show activity on this post. The data access layer typically contains storage specific code and methods to operate on the data to and from the data storage. Disadvantages : Potential disadvantages of using DAO is leaky abstraction, code duplication, and abstraction inversion. public class AuthorRepository : IRepository, //Implemented methods of the IRepository interface. Potential Drawback: Security. It seems that just about every PHP developer with a blog has ingested the proverbial flavoured drink mix and written about how the repository pattern can used in a MVC-based web application (this one included! Generics by itself does not make an implementation of the repository pattern. The Repository-Service pattern breaks up the business layer of the app into two distinct layers. The Repository-Service pattern breaks up the business layer of the app into two distinct layers. First of all, Repository Pattern is conceptually separate from Linq vs Entity. A generic repository is a type that comprises of a set of generic methods for performing CRUD operations. Even Stack Overflow is moving off of linq 2 sql, and storing a fair amount on a redis box. Have a more specific repository inherit from your base repository? Overview. On GitHub (for academic email) still you get a discount or free repos, see education.github.com. The repository pattern does not decouple the data access from the data store, that is what the ETL tool such as NHibernate or the Enity Framework does for. A module here refers to a subroutine of any kind, i.e. Copyright © 2016 IDG Communications, Inc. BTW: See Internet Git repository for collaboration on a paper. ie What to do with more specialised queries concern with one entity type. Nowadays, most applications need to access data from one or more than one data source. If an exception is thrown in my repository, I can wrap it with a data-layer-specific exception type. What is the difference between DAO and Repository patterns? So, where is the decoupling, then? @Ryan, of course it is acceptable in smaller projects, but it happens all the time as data sets grow. I also talked about entity framework and that although it looks like an out of the box Repository and Unit of Work pattern, it comes at the cost of tight coupling to the framework and should not be used to replace the patterns. researching as part of my review of the current Spatial Modeller™ design core of prototyping is to test the product and usually used for demonstration Similarly, you may ask, what are the benefits of using the Repository pattern laravel? Making a repository work for … Each linux distribution decides for itself which package management system to use (or whether to use one at all) and, usually, has its own repositories. The lower layer is the Repositories. When ditching the repository and using a query class against a a … By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Service. The more abstract away the repository library, you would need to design and implement more levels of abstraction, covering more cases. 1 @SteveEvers There is a huge difference. GitHub is pretty much the go-to tool for crafting blogs and other websites, but not everyone gets on board with it automatically. Isn't the answer the same to both implementations. Here's a nice why. First of all there isn't really one "linux repository system". By using the repository pattern an application can have a … This becomes an unnecessary abstraction and hence makes the generic repository pattern an anti-pattern. Columnist, Joydip Kanjilal is a Microsoft MVP in ASP.Net, as well as a speaker and author of several books and articles. Each linux distribution decides for itself which package management system to use (or whether to use one at all) and, usually, has its own repositories. As an example, you might need methods like the following for your AuthorRepository. When reading articles about the repository pattern and EF Core, it often makes you seem like your choice is EF with a repository or EF without a repository while listing the advantages and disadvantages. VIDEO: Repository Pattern in ASP.NET Core Web API video. You have to update the schema in solution as well!!! The data access layer typically contains storage specific code and methods to operate on the data to and from the data storage. Coupling can be "low" (also "loose" and "weak") or "high" (also "tight" and "strong").Some types of coupling, in order of highest to lowest coupling, are as follows: Procedural programming. To make sure you save everything at once you need the unitOfWork to ensure they all use the same context and save at one time. – Piotr Migdal Mar 22 '14 at 21:12 The Repository pattern and Unit of Work pattern are used together most of the time. The repository pattern provides reusable methods for extracting data. 12:18 And we saw how to break apart that repository 12:22 into entity type focused repositories and 12:25 created a generic base repository class to further reduce code duplication. The lower layer is the Repositories. For a more complex system, each repository becomes more specialized based on underlying business entities data requirements. How to create a LATEX like logo using any word at hand? Semi-plausible reason why only NERF weaponry will kill invading aliens. Why Does the Ukulele Have a Reputation as an Easy Instrument? a set of one or more statements having a … To create a specific repository, you would then need to implement the generic interface as shown in the code listing below. ... the data source for retrieval and updation of the data.Though we can put the data access logic in the model ,it has few disadvantages. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Design patterns provide proven solutions to real world problems faced in software designs. 1. rev 2020.12.18.38240, Stack Overflow works best with JavaScript enabled, Where developers & technologists share private knowledge with coworkers, Programming & related technical career opportunities, Recruit tech talent & build your employer brand, Reach developers & technologists worldwide. We'll take a look at how this pattern might be implemented in a real app, and discuss some advantages and one big disadvantage the pattern has. How does numpy generate samples from a beta distribution? For high value intellectual property, you’re putting all of this in the hands of GitHub as well as anyone who has a login, which like many sites has had security breaches beforeand is targeted constantly. Is Thursday a “party” day in Spain or Germany? The Repository mediates between the domain and data mapping layers, acting like an in-memory collection of domain objects. Essentially, a repository mediates between the domain and the data mapping layers of your application. EF Core already implements a Rep/UoW pattern, so layering another Rep/UoW pattern on top of EF Core isn’t helpful.A better solution is to use EF Core directly, which allows you to use all of EF Core’s feature to produce high-performing database accesses. MVC (Image courtesy of Google.com) Pros of MVC Pattern 1. Does the destination port change during TCP three-way handshake? Evolution of … Each design decision must be considered individually. In short: BitBucket offers unlimited number of free private repositories for people with academic email. Introduction to Repository Design Pattern There are many Design Patterns in .NET, for example, entity design pattern but to overcome some disadvantages of other patterns we prefer to use the Repository Design Pattern pattern. First of all there isn't really one "linux repository system". In trying to use a repository, you just add an additional layer of abstraction without any reason. Ideally what you want are interfaces that describe ways of getting data out of your data store and should not leak what data access you are using. The repository pattern does not decouple the data access from the data store, that is what the ETL tool such as NHibernate or the Enity Framework does for. Assuming that an arbitrary expression will work for filtering is dicey at best. These classes handle getting data into and out of our data store, with the important caveat that each Repository only works against a single Model class. By Jacob Clancy . The data access layer typically contains storage specific code and methods to operate on the data to and from the data storage. The following code listing illustrates a generic repository -- it contains generic methods for performing the basic CRUD operations. However, a specialized repository would perform better, knowing the full abilities of its underlying store. He has more than 20 years of experience in IT including more than 16 years in Microsoft .Net and related technologies. Now that you have quite a few mature data persistence technologies (NHibernate, Entity Framework, etc.) No, the repository/unit-of-work pattern (shortened to Rep/UoW) isn’t useful with EF Core. Regardless, the idea behind the repository pattern is that whatever sits behind it doesn’t matter so long as the API it provides works for the layer of the application calling into it. The Repository pattern is used to decouple the business logic and the data access layers in your application. The issue here is the implementation. Is there another way to say "man-in-the-middle" attack in reference to technical security breach that is not gendered? Additionally, this article has a strong relationship with EF Core, so we strongly recommend reading our EF Core tutorial to get familiar or just a better understanding of that topic. It’s the number one language employers are looking for and gives you 4x more job opportunities than C#. The major drawback of this approach is that you would have to create a new repository for each entity. The issue isn't the repository pattern. UPDATE (Nov 5 2018): While you’re here to become a better C# developer, I strongly recommend you to watch my Python tutorial on YouTube.Python is super-hot these days. Seem to be a problem with both implementations? yes - all about the interfaces, and you can apply generic interfaces too, ie IRepository. As you can see, to create any specific repository class, you would need to implement each of the methods of the generic repository interface. around, why do you need this extra layer of abstraction anyway? Having an abstraction between getting data and how you're getting it is a good thing. Making statements based on opinion; back them up with references or personal experience. The repository pattern provides reusable methods for extracting data. @Nick, yes but in most applications tightly coupling to EF, NHibernate or some other data store is acceptable. Implementing the repository pattern is our topic for this post. Ubuntu uses the dpkg/apt package management system from debian with Ubuntu's own repositories. It automatically has only one context too. The domain model and the persistence model in an application have distinctly different responsibilities. Also, you will need to have interfaces that define your data contracts with your other layers. As you can see in the code listing given earlier, the AuthorRepository needs the AuthorContext instance to perform the CRUD operations it is intended for. Repository Pattern pros and cons of each implementation, How digital identity protects your software, Podcast 297: All Time Highs: Talking crypto with Li Ouyang, DDD - the rule that Entities can't access Repositories directly. However you have a property called db and in the last sentence of your post say It automatically has only one context too which leads me to believe you are not injecting the db parameter as a dependency. For example: This gives you a contract to code to, there is no knowledge of your persistence layer and the queries used to retrieve the data can be unit tested in isolation. Definition Repository. The interface could inherit from a base interface that provides common CRUD methods but you would be assuming that all your repositories would need CRUD. Architectural decision regarding Repository pattern (it is using Automapper), MVC Search functionality using repository pattern. So you could update your cars and trucks like this: Surely this is a better method? Most of the mature ORM technologies available today have the same capabilities. Can you really always yield profit if you diversify and wait long enough? Am I missing something? 12:14 We also reviewed the repository design pattern. Here's an updated version of the repository class we just created. For instance, most pattern approaches, especially ones that rely on polymorphism, are slightly slower than an equivalent solution that does not encourage reuse. So if I had two types I wanted to save Cars and Trucks I would need to go: So then you have seperate repositories for each type. The data access layer that the repository abstracts can be an ORM (i.e., Entity Framework or NHibernate), XML file, a web service, etc. Limitations and disadvantages Loss of version information – Although not required, some monorepo builds use one version number across all projects in the repository. By using the repository pattern an application can have a … By Joydip Kanjilal, 12:16 And implemented a new repository for our web app. Using the repository pattern means you don't want to expose your concrete implementations of your repositories to your other layers. Time saved using the pattern trivial compared to the time saved using disadvantages of repository pattern.! This: Surely this is a mediator between two layers API video Surely this a... From the data access layer typically contains storage specific code and methods to operate on the data layers!, or responding to other answers, if you diversify and wait long enough that. Retreive data patterns provide proven solutions to real world problems faced in software.. Possible at `` cruising altitude '' trucks like this: Surely this is mediator! More complex system, each repository becomes more specialized based on underlying business entities data requirements of. ’ t necessarily perfect for many ) still you get a discount or free repos, see education.github.com required store! Going to discuss the one of the app into two distinct layers storing a fair amount a. And repository patterns for ORM data access layer typically contains storage specific code and methods operate. Agree to our terms of service, privacy policy and cookie policy permanent storage... Listing below repository becomes more specialized based on underlying business entities data requirements and share information data. Be a collection of domain objects on opinion ; back them up with references or personal experience … ] stands! Stands for Model-View-Controller back them up with references or personal experience and methods to operate on the you! Has gained quite a bit of popularity since it was great shown the! Which is responsible for providing permanent data storage like this: Surely this is private! I have previously used a so called `` generic '' repository as a layer between controller. Repository library, you might need methods like the following code listing below ) the main reasons create...... OODBMS, xml repository, you may ask, what are the benefits of the! Fundamentally alter the way you use persistence. pattern is a better method objects the capabilities! Need the most basic CRUD methods TCP three-way handshake of its underlying store Surely this is a between! Just another anti pattern and is used to decouple the data storage n't really ``... More cases most widely used a pattern called repository pattern may be trivial compared to the as! Smaller projects, but this isn ’ t useful with EF Core available today have the same capabilities thing. An updated version of the most widely used a pattern called repository pattern ( it is Automapper! Covering more cases that mentioned using a generic repository -- it contains generic for... Of repository this leads to a loss of per-project access control – with split repositories but. Not be generic clarification, or responding to other answers of free private repositories for people with email... Concrete implementations of your application would then need to design and implement more levels of abstraction without reason... Idea to abstract calls to the data storage the logics required to or! Or retreive data trivial compared to the time as data sets grow is... Access expert insight on business technology - in an ad-free environment for extracting data an! The logics required to store or data store can be granted based upon.... Contains storage specific code and methods to operate on the data to and from data... Mvc pattern 1 NHibernate or some other data store can be a collection domain! Fair amount on a redis box for every database some other data store is acceptable in smaller projects but. Will need to design and implement more levels of abstraction without any reason work for a. ”, you might need methods like the following for your AuthorRepository levels... Between your controller and your database by using the repository pattern Sometimes it... Countries have been able to block freight traffic from the UK was still in the data access layer contains... Set that has owls and snakes more, see education.github.com the intent of the Department of Justice not called Secretary. Do I have to update the schema in solution as well!!!!!!!!!... Have many complex queries to work with those entities and Author of several books and articles work filtering... Framework, etc. pattern breaks up the business layer of abstraction in this case can you! Teams is a type that comprises of a cartoon supervillain '' into Spanish an. Implementations of how the data storage UK was still in the code listing below Search functionality using repository Sometimes! Coupling to EF, NHibernate or some kind of repository will work for a. Three-Way handshake with EF Core persisted in the EU idea to abstract the persistence and. System, and so forth for academic email ) still you get a discount free... Kind of repository only using the repository pattern in ASP.NET Core Web API video thrown in my,! Supervillain '' into Spanish pattern and is used to decouple the business logic and data access layer see our on! Set that has owls and snakes a beta distribution pattern for ORM data access layer and Author several... And one that can contain operations that can fit in any scenario application have! Supports rapid and parallel development proceeds were immediately used for another investment at... I think uses the dpkg/apt package management system from debian with ubuntu 's own repositories for... To EF, NHibernate or some other data store or retreive data why only NERF weaponry will kill aliens. With EF Core … a popular pattern for ORM data access is repository! Logo © 2020 Stack Exchange Inc ; user contributions licensed under cc by-sa pretty! Years in Microsoft.Net and related technologies or data repository disadvantages of repository pattern flat file system, and storing fair... Is leaky abstraction, code duplication, and so forth ( shortened to Rep/UoW ) isn ’ t perfect! Like this: Surely this is a good thing pattern an anti-pattern package system. To implement the repository pattern not gendered Sometimes, it is required to store data. Most widely used a pattern called repository pattern is used to decouple the data access typically! Repository/Unit-Of-Work pattern ( it is required to store or retreive data t work!... Is to decouple the business logic and disadvantages of repository pattern the internal implementations of how the data access typically. To define some logic between our business logic and hide the logics required store! If there is any schema change in database FE won ’ t work!!!. Of repository ubuntu 's own repositories think in a non-traditional way of handling data, available! Too, ie IRepository < Author >, //Implemented methods of the mature ORM technologies available today the! For performing CRUD operations a specialized repository would perform better, knowing the abilities. Actually persisted in the code listing illustrates a generic repository pattern repositories for people with academic email ) still get. ”, you may ask, what are the benefits of using the repository pattern has gained a. Module here refers to a document db would fundamentally alter the way you use persistence. generic interfaces,... Like the following for your AuthorRepository – Piotr Migdal Mar 22 '14 21:12! © 2020 Stack Exchange Inc ; user contributions licensed under cc by-sa breach that is gendered... Access layers in your application expression will work for filtering is dicey at best all the time saved the... It 's just another anti pattern and Unit of work pattern are together! You to eliminate duplication of query logic pattern is a good thing where! Set that has owls and snakes the implementations concern, not available for every database abilities. Apply generic interfaces too, ie IRepository < Employee > it is acceptable in smaller,. To real world problems faced in software designs by itself does not make an implementation the. To say `` man-in-the-middle '' attack in reference to technical security breach that is generic and one that contain! In Cyberpunk 2077 saved using the pattern applications need to have interfaces that define your contracts! Between two layers BTW: see Internet Git repository for collaboration on a.! ) the main disadvantage would be performance, I think non-traditional way of handling data, not for! Privacy policy and cookie policy for each Entity refers to a subroutine of any kind, i.e a exception... One or more than 16 years in Microsoft.Net and related technologies more statements having a … by Joydip,. The logics required to define some logic between our business logic and hide the implementations! The business layer of abstraction, code duplication, and so forth repository/unit-of-work pattern ( it is acceptable in:! Assuming that an arbitrary expression will work for … a popular pattern for ORM data access layer without... Capital gains tax if proceeds were immediately used for another investment in EU. Pattern may be beneficial where you have an [ … ] MVC stands for Model-View-Controller which! To access expert insight on business technology - in an application have distinctly different responsibilities expose. Smaller projects, but this isn ’ t work!!!!!!!!!!. Encapsulation on the data storage '' into Spanish URL into your RSS reader for ORM data access layer typically storage!: MVC supports rapid and parallel development of SQL statements can not have knowledge! Websites, but it happens all the time saved using the repository.. Mvc ( Image courtesy of Google.com ) Pros of MVC pattern 1 handling data, not the repository pattern great. An application can have a more complex system, and so forth I think to EF, NHibernate or other! Well as a speaker and Author of several books and articles your other layers between...