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In most cases, there are many ways to write a query; it may be hard to select the optimal approach. Profiler tools can help you test the performance of these options; use them as often as possible. When you re working with HQL queries, you may wonder whether the generated SQL is optimal. A tool called NHibernate Query Analyzer lets you dynamically write and execute queries on your domain model. It displays the generated SQL query in real time and displays the result of your query when you execute it. It s also helpful when you re learning HQL. For more details, refer to the documentation at http:// www.ayende.com/projects/nhibernate-query-analyzer.aspx.
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We don t expect that you know everything about HQL and criteria after reading this chapter once. But the chapter will be useful as a reference in your daily work with NHibernate, and we encourage you to come back and reread sections whenever you need to. The code examples in this chapter show the three basic NHibernate query techniques: HQL, Query by Criteria (including a Query by Example mechanism), and direct execution of database-specific SQL queries. We consider HQL the most powerful method. HQL queries are easy to understand, and they use persistent class and property names instead of table and column names. HQL is polymorphic: you can retrieve all objects with a given interface by querying for that interface. With HQL, you have the full power of arbitrary restrictions and projection of results, with logical operators and function calls just as in SQL, but always on the object level using class and property names. You can use named parameters to bind query arguments in a secure and type-safe way. Report-style queries are also supported, and this is an important area where other ORM solutions usually lack features. Most of this is also true for criteria-based queries; but instead of using a query string, you use a typesafe API to construct the query. So-called example objects can be combined with criteria for example, to retrieve all items that look like the given example. The most important part of object retrieval is the efficient loading of associated objects that is, how you define the part of the object graph you d like to load from the database in one operation. NHibernate provides lazy-, eager-, and batch-fetching
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strategies, in mapping metadata and dynamically at runtime. You can use association joins and result iteration to prevent common problems such as the n+1 selects problem. Your goal is to minimize database round trips with many small queries; but at the same time, you try to minimize the amount of data loaded in one query. The best query and the ideal object-retrieval strategy depend on your use case, but you should be well prepared with the examples in this chapter and NHibernate s excellent runtime fetching strategies.
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Part 3 NHibernate in the real world
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n real-world projects, you need patterns, tools, and processes that scale well with the projects complexity. NHibernate s power and flexibility allows it to be adapted to almost any solution architecture. Because of this flexibility, it s not always obvious how to make the best use of NHibernate in your projects. In this part of the book, we aim to remedy that, helping you make the best choices by demonstrating many techniques, tips and best practices needed to design and implement persistence layers with NHibernate in the real world.
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This chapter covers
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Implementing layered applications Solving issues when setting up .NET applications using NHibernate Achieving design goals Solving debugging and performance problems Using integrating services like audit logging
At this point, you may be thinking, I know all about NHibernate features, but how do I fit them together to build a full NHibernate application It s time for us to answer that question and to show you how to apply the knowledge you ve gained to implement applications as part of a real-world development process. We discussed the architecture of an NHibernate application in section 1.1.5. This provided the bird s-eye view, but you need to get from that point to working with executable code.
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