In this episode we will continued our dive into how to use NHibernate.

we’ll discuss some of the types of collections (bag, set, and list), some of the features NHibernate offers for loading, sorting, and pre-filtering collection data, and how cascading and transparent lazy loading works with collections of related objects.

Check out Episode #50 for an Introduction to NHibernate
Check out Episode #51 for an Setting up your mappings
Check out Episode #53 for an Configuring NHibernate
Check out Episode #54 for an CRUD and Basic Transparent Cascading
Check out Episode #57 for an More Basic Usages

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In this episode we will continued our dive into how to use NHibernate.

We will continue taking a look at various load/fetch strategies that NHibernate offers.

Check out Episode #50 for an Introduction to NHibernate
Check out Episode #51 for an Setting up your mappings
Check out Episode #53 for an Configuring NHibernate
Check out Episode #54 for an CRUD and Basic Transparent Cascading

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In this episode you will learn about you will learn how to perform basic CRUD operations with NHibernate as well as dive into some of its transparent cascading features such as save (insert) and update.

Check out Episode #50 for an Introduction to NHibernate
Check out Episode #51 for an Setting up your mappings
Check out Episode #53 for an Configuring NHibernate

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In this episode you will learn about you will learn how to set up your configuration for NHibernate.

We will also show you how to bootstrap NHibernate in your code by configuring it and then creating the ISessionFactory

Check out Episode #50 for an Introduction to NHibernate
Check out Episode #51 for an Setting up your mappings

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In this episode you will learn about how to install NHibernate as well as how get started with XML mappings to your object domain model. You will learn how to map a class to a table, specify the primary key/identifier, and map properties to columns.

Check out Episode #50 for an Introduction to NHibernate

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In this episode, you will learn about the reasons why you might use an Object/Relational Mapper (ORM). You will also hear why NHibernate is a particularly good ORM, when it is appropriate to use NHibernate and when it is NOT appropriate to use NHibernate. Finally, you will hear why you might choose NHibernate over the ADO.NET Entity Framework and Linq2Sql and when and might not choose it.

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Rails makes it easy to fetch records from the database without even writing SQL, but it’s equally easy to wind up with slow database queries. In this episode, we’ll use advanced find options to improve the performance of database queries in the cinemas application. We’ll also measure each change along the way to avoid premature optimization. As a result, you’ll be able to benchmark and improve the performance of your database queries. You’ll learn how to:

• create a staging environment for performance testing
• dynamically populate the staging database to simulate the production environment
• use :select to speed up queries by limiting which columns are selected
• use :include to eliminate N+1 query problems
• use :joins to join associations with faster queries and a smaller memory footprint
• add database indexes and understand how they work
• benchmark the performance benefits of the various tuning options

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Callbacks are a way for your application to hook into the lifecycle of Active Record models. In this episode, we’ll use callbacks to solve two database performance problems. We’ll cache a movie’s review count and its average number of stars. You’ll learn how to:

• use Active Record callback methods
• make callbacks conditional
• apply before_save and before_destroy callbacks to keep cache data consistent
• use the counter_cache option on associations
• track dirty columns
• destroy dependent records
• apply other callback tips

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The talk will discuss integrating DataMapper into Ruby web frameworks, and using DataMapper models in controllers or as resources in Rails or Merb. It will also discuss using ActiveRecord and DataMapper side-by-side, either in an integrated project or in the process of migrating an existing Rails app over to DataMapper.

by Yehuda Katz

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Validations are the key to preserving data integrity in Rails. We’ll use both built-in and custom validations to make sure movie reviews are submitted with valid data. You’ll learn how to:

• use built-in validation methods
• handle form errors conveniently
• add custom validations using the validate method
• validate across multiple database columns
• make validations conditional based on authentication
• handle validations across multiple models that are associated

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We’ll pick up where we left off by fetching models using the find method with several options, including the new Rails 2.1 named_scope method. You’ll learn how to:

• perform finds on models using various find options
• write class methods to encapsulate complex find operations
• use the new Rails 2.1 named_scope method to elegantly constrain queries and make controllers easier to read
• perform calculations using the built-in calculation methods
• use more advanced find options such as :include

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We’ll start by creating the Movie, Review, Showing, and Theatre models, then knit them together with associations to bring the cinemas application to life. You’ll learn how to:

• create models with their respective database tables
• use one-to-many and many-to-many associations
• apply guidelines for when to choose a particular association
• create a join model with a :through association
• navigate between associated models

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Active Record models are the foundation of every good Rails application. Learn how to get the most out of the Active Record features that you use on a day-to-day basis from a popular Rails developer and screencaster. In these screencasts, Ryan Bates incrementally builds the models for a Rails application and refactors them over time to address new features. All the code is based on Rails 2.1 features.

Throughout these 20-30 minute screencast episodes, you’ll get inside the mind of an experienced Rails developer: his thought processes, his development techniques, the tools he uses, and the tricks of the trade. You can follow along as he adds new features to shape the application over time. You’ll also see how he troubleshoots problems along the way. You’ll not only learn more about Active Record, you’ll also see ways to streamline your development workflow.

This episode highlighting the application Ryan builds in these screencasts

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Summary
At The Spring Experience conference, InfoQ caught up with Patrick Linskey of BEA to discuss the current status of the Apache OpenJPA project. Linskey explains where OpenJPA came from, how it fits into the Object\Relational Mapping space, the differentiating features that OpenJPA provides, the JPA specification, and future plans for OpenJPA.

Bio
Patrick Linskey has been involved in object/relational mapping for 5+ years. Now at BEA, he leads the EJB team in designing and implementation of the WebLogic Server EJB solution. Patrick is one of the leaders on the EJB3 and the JDO specification teams, and is BEA's representative on the EJB3 expert group. Patrick also leads the OpenJPA open source project in Apache.

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Summary
LINQ creator Erik Meijer talks about the design and capabilities of LINQ, how to use it, why to use it, how it differs from XQuery, how it addresses ORM, extension methods, EDM, and more.

Bio
Erik Meijer is the creator of LINQ at MS, where he works together with the Microsoft Visual C# and the Microsoft Visual Basic language design teams on data integration in programming languages. Erik is one of the designers of the standard functional programming language Haskell98 and more recently the Cw language.

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Summary
Our guest this week is Oren Eini. Mr. Eini has been heavily involved in the NHibernate project for the past couple of years. Oren gives us a good introduction to NHibernate moving from the simplest queries to more complex patterns. He also demonstrates his own query generator utility.

Bio
Oren Eini is a .NET developer living in Israel and currently working for We! He is heavily involved in the nHibernate project among other things. You can read his blog at http://www.ayende.com

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Summary
In this presentation from QCon, Erik Meijer discuss C# 3.0 and LINQ with Objects, XML, and relational data using O/R mapping with a focus on composition. This is a more in depth discussion building on top of his "Democratizing the Cloud" presentation.

Bio
Erik Meijer is an architect in the Microsoft SQL server division where he currently works together with the Microsoft Visual C# and the Microsoft Visual Basic language design teams on data integration in programming languages. He was an associate professor at Utrecht University and adjunct professor at the Oregon Graduate Institute.Erik is one of the designers of Haskell98 and the Cw language.

About the conference
QCon is a conference that is organized by the community, for the community.The result is a high quality conference experience where a tremendous amount of attention and investment has gone into having the best content on the most important topics presented by the leaders in our community.QCon is designed with the technical depth and enterprise focus of interest to technical team leads, architects, and project managers.

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Summary
In this interview, Jimmy focuses on LINQ to SQL and ORM. Jimmy has tried to create a similar technology to LINQ to SQL in the past, but without similar results. While LINQ to SQL is a step in the right direction, .NET still lags behind other programming languages in object-relational mapping capabilities.

Bio
Jimmy Nilsson is co-founder and CEO of the Swedish consulting company factor10. He has written numerous technical articles and two books, including 'Applying Domain-Driven Design and Patterns'. He has also been training and speaking at conferences, but above everything else, in his own words, he is a developer with twenty years of experience. Visit Jimmy's blog at http://JimmyNilsson.com/blog/.

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This video shows how to execute any arbitrary SQL through the ExecuteCommand syntax and encapsulating the code through the partial DataContext class.

Presented by Scott Stanfield

Date: 13 March 2008

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In this video I demonstrated how to create, update and delete records through LINQ,
simple transactions, updates across relationships, and custom column and row validation.

Presented by Scott Stanfield

Date: 15 November 2007

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Override the generated ORM update/delete/insert logic with your own through stored procedures. The video also shows in detail how to use the SQL Profiler to monitor the changes in the ORM from generated SQL to our custom SQL stored procs. Since we're just writing SQL, the same techniques apply to both C# and VB developers.

Presented by Scott Stanfield

Date: 13 March 2008

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Using existing stored procedures and functions is easy with LINQ. We simply drag the stored procedures onto the O/R mapping surface and call them from the generated Data Context object.

Presented by Scott Stanfield

Date: 10 January 2008

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The LinqDataSource control can be customized declaritively, as shown in Part 5, or through code by handling the Selecting method.

Presented by Scott Stanfield

Date: 10 January 2008

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The new asp:LinqDataSource control .NET 3.5 makes binding to UI elements easy. In fact, no code was written or harmed in the making of this video. Query, update, delete, paging, sorting, all done through LINQ and the LinqDataSource.

Presented by Scott Stanfield

Date: 10 January 2008

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This video shows how to query a database with LINQ, the underlying SQL with a query visualizer, databinding to ASP.NET controls and record paging.

Presented by Scott Stanfield

Date: 15 November 2007

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LINQ to SQL relies on an object-to-relational model set of classes that map to your database tables. Visual Studio 2008 includes a visual ORM design surface that maps these tables to code.

Presented by Scott Stanfield

Date: 15 November 2007

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Summary
This presentation by Hamilton Verissimo and Oren Eini show Castle Active Record - an ORM solution for .NET building on NHibernate. After an introduction, the presentation dives into various advanced topics and techniques for working with Castle Active Record.

Bio
Hamilton Verissimo leads the Castle Project, an open source project for .Net, and runs Castle Stronghold, a software development company in Brazil. Oren Eini is a senior developer in We!, a consulting group based in Israel, focusing on architecture, data access and best practices. He has a blog at http://www.ayende.com/Blog/

About the conference
JAOO is the premier European developer conference on software technology, methods and best practices. The conference presents in-depth presentations and tutorials by researchers, engineers and trend-setters in software engineering and technology.

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CakePHP is a rapid development framework for PHP that provides an extensible architecture for developing, maintaining, and deploying applications. Using commonly known design patterns like MVC and ORM within the convention over configuration paradigm, CakePHP reduces development costs and helps developers write less code.

This video walks you through the initial steps of creating the Bakery application using the CakePHP Rapid Development Framework.

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CakePHP is a rapid development framework for PHP that provides an extensible architecture for developing, maintaining, and deploying applications. Using commonly known design patterns like MVC and ORM within the convention over configuration paradigm, CakePHP reduces development costs and helps developers write less code.

This tutorial takes you through the steps of creating a simple Blog using the CakePHP Rapid Development Framework.

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