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A common claim is that hand-coded persistence can always be at least as fast, and often faster, than automated persistence. This is true in the same sense that it s true that assembly code can always be at least as fast as .NET code in other words, it s beside the point. The unspoken implication of the claim is that hand-coded persistence will perform at least as well in an application. But this implication will be true only if the effort required to implement at-least-as-fast hand-coded persistence is similar to the amount of effort involved in utilizing an automated solution. The interesting question is, what happens when we consider time and budget constraints The best way to address this question is to define a means to measure performance and thresholds of acceptability. Then you can find out whether the performance cost of an ORM is unacceptable. Experience has proven that a good ORM has a minimal impact on performance. It can even perform better than classic ADO.NET when correctly used, due to features like caching and batching. NHibernate is based on a mature architecture that lets you take advantage of many performance optimizations with minimal effort.
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NHibernate abstracts your application away from the underlying SQL database and SQL dialect. The fact that it supports a number of different databases confers a level of
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You shouldn t necessarily aim to write totally database-independent applications, because database capabilities differ and achieving full portability would require sacrificing some of the strength of the more powerful platforms. But an ORM can help mitigate some of the risks associated with vendor lock-in. In addition, database independence helps in development scenarios where you use a lightweight local database but deploy for production on a different database platform.
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In this chapter, we ve discussed the concept of object persistence and the importance of NHibernate as an implementation technique. Object persistence means that individual objects can outlive the application process; they can be saved to a data store and be re-created later. We ve walked through the layered architecture of a .NET application and the implementation of persistence, exploring four possible approaches. You now understand the productivity of DataSet, but you also realize how limited and rigid it is. You ve learned about many useful features that would be painful to hand code. In addition, you know how NHibernate solves the object/relational mismatch. This mismatch comes into play when the data store is a SQL-based RDBMS. For instance, a graph of richly typed objects can t be saved to a database table; it must be disassembled and persisted to columns of portable SQL data types. We glanced at NHibernate s powerful query APIs. After you ve started using them, you may never want to go back to SQL. Finally, you learned what ORM is. We discussed, from a non-technical point of view, the advantages of using this approach. ORM isn t a silver bullet for all persistence tasks; its job is to relieve the developer of 95 percent of object persistence work, such as writing complex SQL statements with many table joins and copying values from ADO.NET result sets to objects or graphs of objects. A full-featured ORM middleware like NHibernate provides database portability, certain optimization techniques like caching, and other functions that aren t easy to hand code in a limited time with SQL and ADO.NET. It s likely that a better solution than ORM will exist some day. We (and many others) may have to rethink everything we know about SQL, persistence API standards, and application integration. The evolution of today s systems into true relational database systems with seamless object-oriented integration remains pure speculation. But we can t wait, and there is no sign that any of these issues will improve soon (a multibillion-dollar industry isn t agile). ORM is the best solution currently available, and it s a timesaver for developers facing the object/relational mismatch every day. We ve given you background on the reasons behind ORM, the critical issues that must be addressed, and the tools and approaches available with .NET for addressing them. We ve explained that NHibernate is a fantastic ORM tool that lets you combine the benefits of both object orientation and relational databases simultaneously. The next step is to give you a hands-on look at NHibernate so you can see how to use it in your projects. That s where chapter 2 comes in.
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Hello NHibernate!
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