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Create and load the execution log database 1. Open Microsoft SQL Server Management Studio and connect to the Database Engine. 2. Right-click the Databases folder, and then click New Database. 3. Type a name for the database in the New Database properties dialog box: RSExecutionLog. 4. Click Options, set the Recovery Model to Simple, and then click OK. 5. Click Open File on the toolbar, navigate to the C:\Documents and Settings\<username> \My Documents\Microsoft Press\rs2005sbs\chap11 folder, open the createtables.sql file, and connect to the Database Engine. Note

The identifier property (if it exists) is null. The version property (if it exists) is null. You supply an unsaved-value in the mapping document for the class, and the value of the identifier property matches. You supply an unsaved-value in the mapping document for the version property, and the value of the version property matches. You supply an NHibernate IInterceptor and return true from IInterceptor.IsUnsaved() after checking the instance in your code.

The example domain model uses the primitive type long everywhere as the identifier property type. Because it isn t nullable, you have to use the following identifier mapping in all your classes:

<class name="Category" table="CATEGORY"> <id name="Id" unsaved-value="0"> <generator class="native"/> </id> .... </class>

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The createtables.sql file is included for your convenience in the practice files. Reporting Services supplies this file in the SQL Server 2005 samples. After you install the samples, you ll find this file in the C:\Program Files\Microsoft SQL Server\90\Samples \Reporting Services\Report Samples\Server Management Sample Reports\Execution Log Sample Reports folder.

The unsaved-value attribute tells NHibernate to treat instances of Category with an identifier value of 0 as newly instantiated transient instances. The default value for the

attribute unsaved-value is null if the type is nullable; otherwise, it s the default value of the type (0 for numerical types); because you ve chosen long as the identifier property type, you can omit the unsaved-value attribute in your auction application classes. Technically, NHibernate tries to guess the unsaved-value by instantiating an empty object and retrieving default property values from it.

6. Click RSExecutionLog in the Availalbe Database drop-down list. 7. Click Execute (or press F5) to run the createtables.sql script. The results of the query execution are displayed in the Messages tab on the Results pane:

This approach works nicely for synthetic identifiers, but it breaks down in the case of keys assigned by the application, including composite keys in legacy systems. We discuss this issue in section 10.2. Avoid application-assigned (and composite) keys in new applications if possible (this is important for non-versioned entities).

You now have the knowledge to optimize your NHibernate application and reduce the number of calls to the persistence manager if you want to save and delete objects. Check the unsaved-value attributes of all your classes and experiment with detached objects to get a feel for the NHibernate transitive persistence model. Having focused on how to persist objects with NHibernate, we can now switch perspectives and focus on how you go about retrieving (or loading) them.

.

Retrieving persistent objects from the database is one of the most interesting (and complex) parts of working with NHibernate. NHibernate provides the following ways to get objects out of the database:

11:

Navigating the object graph, starting from an already loaded object, by accessing the associated objects through property accessor methods such as aUser.Address.City. NHibernate automatically loads (or preloads) nodes of the graph while you navigate the graph if the ISession is open. Retrieving by identifier, which is the most convenient and performant method when the unique identifier value of an object is known. Using Hibernate Query Language (HQL), which is a full object-oriented query language. Using the NHibernate ICriteria API, which provides a type-safe and object-oriented way to perform queries without the need for string manipulation. This facility includes queries based on an example object. Using native SQL queries and having NHibernate take care of mapping the ADO.NET result sets to graphs of persistent objects. Using LINQ for NHibernate is another option available. This lets you specify your NHibernate queries using LINQ. At the time of writing, LINQ for NHibernate looks very promising despite the fact it s still a work in progress. We don t cover it in this book, but feel free to investigate further by visiting the NHContrib project website.

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