01-06-01【Nhibernate (版本3.3.1.4000) 出入江湖】事务

Nhibernate事务的使用：

public void Add(Customer customer)
{
ISession session = _sessionManager.GetSession();
ITransaction transaction = session.BeginTransaction();

try
{
session.Save(customer);
session.Flush();//清除一级缓存

transaction.Commit();
}
catch (Exception)
{
transaction.Rollback();
}
finally
{
session.Close();
}
}

测试：

[TestMethod]
[ExpectedException(typeof(NHibernate.Exceptions.GenericADOException))]
public void TestAddTransation()
{
CustomerService customerService = new CustomerService();
OrderService orderService = new OrderService();

Customer customer1 = new Customer()
{
FirstName = "Test",
LastName = "TestAddTransation1",
Age = 10
};
Order order1 = new Order()
{
OrderDate = DateTime.Now.AddMinutes(1),
Customer = customer1
};
Order order2 = new Order()
{
OrderDate = DateTime.Now.AddMinutes(2),
Customer = customer1
};

Customer customer2= new Customer()
{
FirstName = null,  //数据库要求不能为null，现在故意引发添加异常
LastName = "TestAddTransation",
Age = 10
};
Order order3 = new Order()
{
OrderDate = DateTime.Now.AddMinutes(3),
Customer = customer2
};
Order order4 = new Order()
{
OrderDate = DateTime.Now.AddMinutes(4),
Customer = customer2
};

customer1.Orders.Add(order1);
customer1.Orders.Add(order2);
customer2.Orders.Add(order3);
customer2.Orders.Add(order4);

customerService.Add(customer1); //customer1及其Order1与Order2能成功插入，因为他们与Customer2不在同一个事务
customerService.Add(customer2); //Customer2插入失败，Order3和Order4也不能成功插入。

Assert.IsNull(customerService.Get(customer1.CustomerId));
Assert.IsNull(orderService.Find(order1.OrderId));
Assert.IsNull(orderService.Find(order2.OrderId));
}

-----------------------------------------------

关于事务操作的添加：

session.Flush();//清除一级缓存

是否会立即保存到数据库

结论是:不会立即保存的数据库，而是等到调用transaction.Commit();才真正保存到数据库：

图解：