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NHibernate (and many other ORM implementations) defers the execution of SQL
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statements. An INSERT statement isn t usually executed when the application calls ISession.Save(); an UPDATE isn t immediately issued when the application calls Item.AddBid(). Instead, the SQL statements are generally issued at the end of a transaction. This behavior is called write-behind, as we mentioned earlier. This fact is evidence that tracing and debugging ORM code is sometimes nontrivial. In theory, it s possible for the application to treat NHibernate as a black box and ignore this behavior. The NHibernate application can t detect this write-behind (at least, not without resorting to direct ADO.NET calls). But when you find yourself troubleshooting a difficult problem, you need to be able to see exactly what s going on inside NHibernate. Because NHibernate is open source, you can easily step into the NHibernate code. Occasionally, doing so helps a great deal. But especially in the face of write-behind behavior, debugging NHibernate can quickly get you lost. You can use logging to obtain a view of NHibernate s internals. We ve mentioned the show_sql configuration parameter, which is usually the first port of call when troubleshooting. Sometimes the SQL alone is insufficient; in that case, you must dig a little deeper. NHibernate logs all interesting events using the open source library log4net. To see any output from log4net, you need to add some information in your application configuration file. The example in listing 2.9 directs all log messages to the console.
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Listing 2.9 Basic configuration of log4net
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< xml version="1.0" > <configuration> <configSections> <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler,log4net" /> </configSections> <log4net> <appender name="ConsoleAppender" type="log4net.Appender.ConsoleAppender, log4net"> <layout type="log4net.Layout.PatternLayout, log4net"> <param name="ConversionPattern" value="%m" /> </layout> </appender> <root> <priority value="WARN" /> <appender-ref ref="ConsoleAppender" /> </root> </log4net> </configuration>
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You can easily merge this file with listing 2.8. With this configuration, you won t see many log messages at runtime.
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Hello NHibernate!
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Replacing the priority value WARN with INFO or DEBUG reveals the inner workings of NHibernate. Make sure you don t do this in a production environment writing the log will be much slower than the actual database access. We don t give more details about log4net configuration here; feel free to read its documentation. In this section, we talked about database-access configuration. This configuration is useless if NHibernate doesn t know how to manipulate your entities. The next chapter covers NHibernate mapping.
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In this chapter, we took a high-level look at NHibernate and its architecture after running a simple Hello World example. You also saw how to configure NHibernate in various environments and with various techniques. The Configuration and SessionFactory interfaces are the entry points to NHibernate for applications running in both WinForms and ASP.NET environments. Hibernate can be integrated into almost every .NET environment, be it a console application, an ASP.NET application, or a fully managed three-tiered client/server application. The most important elements of an NHibernate configuration are the database resources (connection configuration), the transaction strategies, and, of course, the XML-based mapping metadata. NHibernate s configuration interfaces have been designed to cover as many usage scenarios as possible while still being easy to understand. Usually, a few modifications to your .config file and one line of code are enough to get NHibernate up and running. None of this is much use without some persistent classes and their XML mapping documents. The next chapter is dedicated to writing and mapping persistent classes. You ll soon be able to store and retrieve persistent objects in a real application with a nontrivial object/relational mapping.
Part 2 NHibernate deep dive
his part of the book explains the essential knowledge needed for working with NHibernate. Starting with a complete application, we walk you through the steps needed to design, implement, and optimize NHibernate applications. This section also gives you expertise in some of the less-understood parts of NHibernate, which will help you succeed with even the most complex projects.
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