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    <p>This is what in the spring documents is referred to as <a href="http://www.springframework.net/doc-latest/reference/html/classic-spring.html#d4e11771" rel="nofollow noreferrer">Classic Hibernate Usage</a>. It is not the currently recommended approach to work with NHibernate, which is described in the <a href="http://www.springframework.net/doc-latest/reference/html/orm.html#orm-hibernate" rel="nofollow noreferrer">chapter on object relational mappers</a>.</p> <p>The "convenient" usage of delegates here is basically done to provide the <code>HibernateTemplate</code> the means to manage a session and hand this managed session over to other custom methods (in this particular case an <a href="http://msdn.microsoft.com/en-us/library/0yw3tz5k.aspx" rel="nofollow noreferrer">anonymous method</a>). (I think it's an implementation of the <a href="http://www.oodesign.com/visitor-pattern.html" rel="nofollow noreferrer">visitor pattern</a>, btw). </p> <p>Using this approach, the classic <code>HibernateTemplate</code> can provide functionality to methods it doesn't "know of", such as opening and closing sessions correctly and participating in transactions. </p> <p>The query is actually being executed by <code>HibernateTemplate.Execute(myMethod)</code>; I imagine it creates and initializes a session for you, does transaction management, executes your method with the managed session and cleans everything up.</p> <p>I've never used <code>HibernateTemplate</code>, but I'm sure it would require mapping files and a <code>SessionFactory</code>, so if this code is hit during execution and doesn't throw any exceptions, the configuration for those has to be there somewhere!</p> <p>With respect to the questions (besides the delegate part) within your posted code: the use of <code>NHibernateTemplate</code> hasn't really got anything to do with it: you can just as well run this code in any piece of code where you've got hold of a valid <code>ISession</code> instance:</p> <ul> <li>the session executes a HQL query; this query is added to the query cache. I've never used <code>SetCacheRegion</code> myself, but apparently it gives you <a href="http://www.nhforge.org/doc/nh/en/index.html#performance-querycache" rel="nofollow noreferrer">"fine-grained control over query cache expiration policies"</a>.</li> <li><a href="https://stackoverflow.com/a/3214264/322283"><code>query.UniqueResult</code></a></li> <li><a href="https://stackoverflow.com/questions/3295976/what-does-nhibernateutil-initialize-do"><code>NHibernateUtil.Initialize</code></a></li> </ul>
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    1. CO@Marjin, thank you for your help. How did you learn Spring.net, is there book you would recommend? Spring.net documentation assumes that reader knows callback, delegate calls etc. I'm looking for 101 with description.
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    2. COAlso, what is purpose of this query IQuery query = hbSession.CreateQuery(queryText). in other words why put on session instead of directly query db. I can't see advantage of storing the query itself in session.
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    3. COSadly, I can't recommend you a book on Spring.Net. Actually, I learned most from the docs, the spring.net forum and the source code. For general understanding of the spring framework, [Spring in Action](http://www.manning.com/walls3/) is a good book, but it's for Spring for Java.
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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