DotNetKicks.com - Stories tagged with NHIbernate

NHibernate.Linq Pitfalls: Casting

Mon, 31 Oct 2011 15:31:32 GMT

One thing that needs to be always remembered when writing NHibernate.Linq queries is that it is going to be translated into SQL eventually. What this means is that we can't do everything in our Select or Where conditions - we are restricted by the capabilities of underlying database and SQL language itself.

NHibernate.LINQ Pitfalls: Nested queries

Wed, 26 Oct 2011 10:35:10 GMT

NHibernate's LINQ provider is very easy to start with and sufficient for majority of use cases, but when used in more complex scenarios it can mislead and surprise. Here is one of the pitfalls (or perhaps bugs?) I've recently run into.

The 3 Types of Security In Enterprise Applications

Sun, 05 Dec 2010 21:14:56 GMT

There are generally three types of security in enterprise applications: 1. Role based security - Which actions can a user do - aka role-based access control 2. Entity level security - A user can only perform an Action on certain objects/data - aka row level security 3. Field level security - A user can see or edit only certain fields of an entity - (this is really fine grained and usually a bad idea)

Setting Up Fluent NHibernate for your project

Thu, 11 Mar 2010 20:15:00 GMT

Taking a look at how to use setup and configure Fluent NHibernate for usage. We will focus on how to setup your database settings as well as how to get your Fluent NHibernate mappings registered into the system.

Introduction to Nhibernate.Burrow

Tue, 02 Mar 2010 12:21:41 GMT

Taking a look at how to implement the NHibernate.Burrow session management library. NHibernate.Burrow is a light weight middleware developed to support .Net applications using NHibernate by providing advanced and smart session/transaction management and other facilitates.

Mindscape LightSpeed 3.0 - Advocating a Commercial ORM

Mon, 14 Dec 2009 22:30:04 GMT

Compares the features of Mindscape's LightSpeed 3.0 ORM with those of LINQ to SQL and NHibernate.

Visual NHibernate beta

Thu, 03 Dec 2009 16:36:19 GMT

Visual NHibernate makes it easier and quicker to create and maintain NHibernate projects - even very complex ones. Point it at your existing projects and start modelling them right away - visually. Visual NHibernate makes complex mapping to multiple database tables easy. Simply connect a mapping to a table field and the mapping is complete - all required NHibernate code is generated based on what is mapped. This is the only tool supporting complex mapping to multiple database tables. (Others only allow one-to-one mapping of tables and classes.) This is a true separation of the domain model and the database schema. Using complex mapping allows optimal software architectures to be built on existing legacy databases without having to redesign the database.

Why Linq2NHibernate is not production ready

Thu, 29 Oct 2009 09:08:01 GMT

An opinion on why you shouldn't be using Linq2Nhibernate in production systems

Fluent NHibernate with System.ComponentModel.DataAnnotations

Fri, 23 Oct 2009 18:51:14 GMT

Want to map your domain with DataAnnotations validation? Using Fluent NHibernate? Then take a look at how to create a simple convention!

Database independence with NHibernate

Fri, 23 Oct 2009 05:01:33 GMT

Ayende comments on achieving database independence with NHibernate.

NerdDinner with Fluent NHibernate Part 3 - The infrastructure

Sat, 10 Oct 2009 02:00:00 GMT

This is the final post in a series of three where I'm going to see how we can change the NerdDinner project to use Fluent NHibernate instead of LINQ to SQL. In this post we are going to take a look at the Nhibernate infrastructure and the dinner repository.

NerdDinner with Fluent NHibernate Part 2 - The mapping

Tue, 25 Aug 2009 16:03:37 GMT

This is the second post in a series of three where I'm going to see how we can change the NerdDinner project to use Fluent NHibernate instead of LINQ to SQL. In this post we are going to take a look at the mappings.

NerdDinner with Fluent NHibernate Part 1 - The domain model

Tue, 11 Aug 2009 09:30:01 GMT

This is the first post in a series of three where I'm going to see how we can change the NerdDinner project to use Fluent NHibernate instead of LINQ to SQL. In the first post we are going to take a look at the domain model.

Table Per Subclass Inheritance Mapping with Fluent nHibernate

Thu, 06 Aug 2009 20:50:02 GMT

This is the third in a short series of posts I am working on. While reading through NHibernate in Action I thought to my self that I should create these same examples of Inheritance mapping using Fluent nHibernate to show how simple these mappings can be.

Table Per Class Hierarchy Inheritance Mapping with Fluent nHibernate

Tue, 04 Aug 2009 20:36:23 GMT

This is the second in a short series of posts I am working on. While reading through NHibernate in Action I thought to my self that I should create these same examples of Inheritance mapping using Fluent nHibernate to show how simple these mappings can be. The three types of Inheritance mappings that are mentioned on page 92 of NHibernate in Action are :Model * Table Per Concrete Class * Table Per Class Hierarchy * Table Per Subclass I will be using the example from NHibernate in Action to illustrate the mappings. This post covers the Table Per Class Hierarchy example.

Table Per Class Inheritance Mapping with Fluent nHibernate

Tue, 04 Aug 2009 16:57:41 GMT

This is the first in a short series of posts I am working on. While reading through NHibernate in Action I thought to my self that I should create these same examples of Inheritance mapping using Fluent nHibernate to show how simple these mappings can be.

ASP.NET MVC, DynamicData, Domain-/RiaServices, Unity and NHibernate

Wed, 29 Jul 2009 07:15:00 GMT

For this project the following (extensive) list of libraries is used (all these libraries are included in the download): * MS ASP.NET Mvc 1.0 * Microsoft .NET RIA Services July 2009 Preview * NHibernate 2.1.0CR1 * NHibernate Linq (latest trunk version) * FluentNhibernate (latest trunk version, patched to work with NHibernate 2.1.0CR1) * MS Unity 1.2 * ASP.NET Dynamic Data MVC Preview (since this project is pretty old, I had to modify it quite a bit, the source is included in the download) * I used Rob Conery's t4 templates as the base to generate entities from the database.

NHibernate - <natural-id/>

Thu, 25 Jun 2009 15:38:42 GMT

A natural id is a way to refer to a unique field of an object as a substitute of the real entity identifier. A good (and typical) example of that would be with the User entity. We have the user name and the user id, both are unique, but the user id is usually something that is generated by our application and has no relation to the a human being. In other words, user #123814 doesn't mean anything to me, while user 'ayende' has a meaning to us.

Book review: NHibernate in Action

Mon, 15 Jun 2009 05:29:35 GMT

In this post I review the book NHibernate in Action from Manning Publications. As far as I know this is the only book that solely covers the Object/Relational Mapper NHibernate.

NHibernate - Beware of inadvisably applied caching strategies

Thu, 04 Jun 2009 04:09:30 GMT

One of the usual approaches for performance problems with most applications is to just throw caching on the problem until it goes away. NHibernate supports a very sophisticated caching mechanism, but, by default, it is disabled. Not only that, but there are multiple levels of opt ins that you have to explicitly state before you can benefit from caching. The answer is quite simple, caching is an incredibly sensitive topic, involving such things as data freshness, target size, repetitive requests, etc. Each and every time I have seen caching used as a hammer, it ended up in tears, with a lot of micro management of the cache and quite a bit of frustration.

Mapping a Twitter like domain with Fluent NHibernate

Sun, 24 May 2009 18:07:34 GMT

I'm currently learning NHibernate, and one of the best ways to learn is to blog about it :) Since I'm not a big fan of XML files, I also wanted to use Fluent NHibernate to do the mapping. As an example I will use a social messaging domain, similar to Twitter. I will also use a Top-down approach, starting with the domain model, writing the mapping, and finally creating the database schema using the SchemaExport class in NHibernate.

Logging NHibernate SQL with log4net in ASP.NET

Sun, 24 May 2009 01:39:24 GMT

Have you ever wondered how to log the SQL generated by NHibernate? This post tries to exemplify just that. NHibernate uses HQL to leverage its expressiveness to the developer, but behind the scenes there is an engine that transforms the HQL into pure SQL that is executed against the database. This SQL can be logged so that you can see its...

NHibernate guides

Thu, 07 May 2009 17:50:52 GMT

I made compilation of various NHibernate guides, help topics, walktroughts, . . Main source is Ayende and Fabio Maulo guides and posts which I find most useful. I hope you'll find this compilation useful either.

NHibernate: Transparent pre generation of lazy loading proxies in VS

Tue, 05 May 2009 17:55:36 GMT

Pre generate NHibernate lazy loading proxies with minimal changes to project, build and deploy configuration, to make whole process of proxies pre generation transparent as much as possible.

ActiveRecord, Firebird and Guid Primary Keys

Tue, 28 Apr 2009 15:37:19 GMT

I like to use the Guid values as Primary Keys, because I do a lot of data synchronization and sometimes I need to know the ID value before saving the record into the database. Here is a good article about using the Guid as Primary Key.