barcode vb.net 2008 While we re on the subject of XML, now is a good time to show you how to configure NHibernate. in C#.NET

Make Code-39 in C#.NET While we re on the subject of XML, now is a good time to show you how to configure NHibernate.

While we re on the subject of XML, now is a good time to show you how to configure NHibernate.
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Hello World with NHibernate
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Configuring your application
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If you ve created .NET applications that use DataSets or DataReaders to connect to a database, you may be familiar with the concept of storing a ConnectionString in your web.config or app.config file. Configuring NHibernate is similar; you add some connection information to the config file. Follow these steps:
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Right-click your HelloNHibernate project in the Solution Explorer, and select Add > New Item. Select Application Configuration File from the options. Click OK to add an app.config file to the project. Copy the following XML into your file:
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< xml version="1.0" encoding="utf-8" > <configuration> <configSections> <section name="nhibernate" type="System.Configuration.NameValueSectionHandler, System, Version=1.0.3300.0,Culture=neutral, PublicKeyToken=b77a5c561934e089" /> </configSections> <nhibernate> <add key="hibernate.show_sql" value="false" /> <add key="hibernate.connection.provider" value="NHibernate.Connection.DriverConnectionProvider" /> <add key="hibernate.dialect" value="NHibernate.Dialect.MsSql2000Dialect" /> <add key="hibernate.connection.driver_class" value="NHibernate.Driver.SqlClientDriver" /> <add key="hibernate.connection.connection_string" value="Data Source=127.0.0.1; Database=HelloNHibernate;Integrated Security=SSPI;" /> </nhibernate> </configuration>
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That s quite a lot of XML! But remember, NHibernate is very flexible and can be configured in many ways. Note that you may need to change the hibernate.connection. connection_string key at the bottom of the XML to connect to the database server on your development computer. Also note that this configuration is for NHibernate 1.2.1GA. If you re using NHibernate 2.0 or later, then copy the following XML instead:
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< xml version="1.0" encoding="utf-8" > <configuration> <configSections> <section name="hibernate-configuration" type="NHibernate.Cfg.ConfigurationSectionHandler, NHibernate" /> </configSections> <hibernate-configuration xmlns="urn:nhibernate-configuration-2.2"> <session-factory>
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Hello NHibernate!
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<property name="connection.provider"> NHibernate.Connection.DriverConnectionProvider </property> <property name="connection.driver_class"> NHibernate.Driver.SqlClientDriver </property> <property name="connection.connection_string"> Server=(local);database=HelloNHibernate;Integrated Security=SSPI; </property> <property name="dialect"> NHibernate.Dialect.MsSql2000Dialect </property> <property name="show_sql"> false </property> </session-factory> </hibernate-configuration> </configuration>
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Updating an Employee
You ve added code for saving and loading Employees. Before we run our application, let s finish off by adding one more function to demonstrate how NHibernate can update existing entities. You ll write some code to update the first Employee and, while you re at it, create a new Employee to be the manager of the first, as shown in listing 2.5. Again, type this code below the other functions in Program.cs.
Listing 2.5 Updating an Employee
static void UpdateTobinAndAssignPierreHenriAsManager() { using (ISession session = OpenSession()) { using (ITransaction transaction = session.BeginTransaction()) { IQuery q = session.CreateQuery( "from Employee where name = 'Tobin Harris'"); Employee tobin = q.List<Employee>()[0]; tobin.name = "Tobin David Harris"; Employee pierreHenri = new Employee(); pierreHenri.name = "Pierre Henri Kuate"; tobin.manager = pierreHenri; transaction.Commit(); Console.WriteLine("Updated Tobin and added Pierre Henri"); } } }
Behind the scenes, NHibernate runs four SQL statements inside the same transaction:
select e.id, e.name, e.manager from Employee e where e.id = 1
Understanding the architecture
insert into Employees (name, manager) values ('Pierre Henri Kuate', null) declare @newId int select @newId = scope_identity() update Employees set name = 'Tobin David Harris', manager = @newId where id = 1
Notice how NHibernate detects the modification to the name and manager properties of the first Employee (Tobin) and automatically updates the database. You re taking advantage of an NHibernate feature called automatic dirty checking: this feature saves you the effort of explicitly asking NHibernate to update the database when we modify the state of an object. Similarly, you can see that the new Employee (Pierre Henri) was saved when it was associated with the first Employee. This feature is called cascading save: it saves you the effort of explicitly making the new object persistent by calling Save(), as long as it s reachable by an already persistent object (Tobin). Also, notice that the ordering of the SQL statements isn t the same as the order in which you set fields of the object. NHibernate uses a sophisticated algorithm to determine an efficient ordering that avoids database foreign-key-constraint violations but is still sufficiently predictable to the user. This feature is called transactional write-behind.
2.1.10 Running the program
Before finally running the example, you need to write some code to run all these functions in the right order. Modify your Program.cs Main method to look like this:
static void Main() { CreateEmployeeAndSaveToDatabase(); UpdateTobinAndAssignPierreHenriAsManager(); LoadEmployeesFromDatabase(); Console.WriteLine("Press any key to exit..."); Console.ReadKey(); }
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