NHibernate - 维基百科，自由的百科全书

//Add a Customer to the datastore  //'sessionFactory' is a thread-safe object built once per application lifetime (can take seconds to build) //based on configuration files which control how database tables are mapped to C# objects //(e.g. which property maps to which column in a database table) // //'session' is not thread safe and fast to obtain and can be thought of as a connection to the database using (var session = sessionFactory.OpenSession())  {     //transaction represents a db transaction     using (ITransaction transaction = session.BeginTransaction())      {         //The line below adds the customer to NHibernate's list of objects to insert to the database         //but it doesn't execute SQL insert command at this stage*.         //*if the Id field is generated by the database (e.g. an auto-incremented number)          //then NHibernate will execute SQL INSERT when .Save is called           session.Save(new Customer { Id = Guid.NewGuid(), FirstName = "Boss", Age = 50 });          //The call below will execute the SQL INSERT and commit the transaction         transaction.Commit();     } }  //Retrieve the Customer from the database, modify the record and update the database using (var session = sessionFactory.OpenSession()) {     using (ITransaction transaction = session.BeginTransaction())      {         //session's Query returns IQueryable<Customer>.         //Only when .FirstOrDefault is called will NHibernate execute the SQL query           Customer customer = session.Query<Customer>().Where(c => c.Token == token ).FirstOrDefault();              //Now the customer is 'part of' the 'session' object and NHibernate keeps track of changes         //made to it          if( customer != null )          {             //Changing a property of an object does NOT cause SQL to be executed             customer.TokenVerified = true;                 //Committing the transaction results in an SQL UPDATE statement            //NHibernate kept track of the fact that 'customer' has been changed since loading             transaction.Commit();         }     } }