Query object implementation examples [closed]

Question

Can anyone recommend good tutorial, implementation or sample code on Query object pattern usage, in C#(Java...)?

I haven't found much with google.

Shanty

Answer 1

With LINQ being almost everywhere, are you sure you need to reimplement the Query Object?

Basically, you can treat all classes from System.Linq.Expressions to be a good implementation of a Query Object pattern.

Afterthought

I tend to agree with this. Can anyone give me a reason why not to use LINQ instead of an implementation of the Query Object Pattern? – Pickar

@Pickar maybe because it isnt supported by his database provider?? – Rateable

over WCF (if you are stuck with a non supporting binding) – Mercia

Answer 2

From Chad Myers:

Part 1: http://www.lostechies.com/blogs/chad_myers/archive/2008/08/01/query-objects-with-the-repository-pattern.aspx

Elgar

Part 2: lostechies.com/blogs/chad_myers/archive/2008/08/02/… – Elgar

Answer 3

I suggest Martin Fowler's Query Object Pattern (http://martinfowler.com/eaaCatalog/queryObject.html). Get his book "Patterns of Enterprise Application Architecture", you'll find sample implementation there.

Turnstile

Answer 4

I wrote a nice query object library for NHibernate. Check it out here: https://github.com/shaynevanasperen/NHibernate.Sessions.Operations

Appolonia