想在开发中使用NHibernate，但担心在性能上的问题，对查询的速度和Ado.Net进行了一下简单的比较。过程和代码如下描述，由于了解不深，暂不做结论，希望大家给点意见。
NHibernate HQL方式 : 830 条记录， 加载时间(ms) : 3334.7952 绑定IList时间(ms) : 70.1008
Ado.Net DbDataAdapter方式 : 830 条记录； 加载时间(ms) ： 40.0576 绑定IList时间(ms) ： 80.1152
测试环境：WinForm方式,数据库也在本机
硬件：CPU -- 1.2G AMD duron(tm) RAM -- 384M DDR266
软件：Windows Server 2003, Sql Server 2000,Visual Studio.Net 2005
测试代码下载http://www.cnblogs.com/Files/liuyuanhuo/NHibernateTest_Performance.rar
测试的代码是在
子非鱼 NHibernate学习 http://sifang2004.cnblogs.com/archive/2005/09/05/230713.aspx
NHibernate 博客园专题之一 http://www.cnblogs.com/Files/sifang2004/NHibernateTest.rar
中下载的示例中作修改的。
测试由两个工程组成，
一.NHibernateTest工程，仅修改两个地方
1.注释Order.hbm.xml中_Items相关的<bag元素
2.在Order.cs增加下面两个方法
/**//// <summary>
/// 使用NHibernate HQL方式查询
/// </summary>
/// <returns>IList,订单对象集合</returns>
public IList LoadAllByNHibernate()
{
IList orders = ObjectLoader.Find( " from Order ", null);
return orders;
}
/**//// <summary>
/// 使用Ado.Net DbDataAdapter方式查询
/// </summary>
/// <returns>DataTable,订单数据表</returns>
public DataTable LoadAllByAdoNet()
{
DataTable dtOrders = new DataTable();
DbConnection dbConnection = new SqlConnection();
dbConnection.ConnectionString =
@"Server=Andy\Andy;initial catalog=Northwind;User id =sa;Password=sa";
DbCommand dbCommand = new SqlCommand();
dbCommand.Connection = dbConnection;
dbCommand.CommandType = CommandType.Text;
dbCommand.CommandText = "SELECT * FROM Orders";
DbDataAdapter dataAdapter = new SqlDataAdapter();
dataAdapter.SelectCommand = dbCommand;
dataAdapter.Fill( dtOrders );
return dtOrders;
}
二.添加一个NHibernateTestUI工程，引用NHibernateTest，从NHibernateTest复制一份app.config到NHibernateTestUI，修改连接串，然后添加一个窗体类，加了两个按钮一个DataGridView, 两个按钮分别测试Ado.Net DbDataAdapter方式和NHibernate HQL方式的加载时间，测试代码如下:
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
namespace NHibernateTestUI
{
public partial class OrderFrm : Form
{
public OrderFrm()
{
InitializeComponent();
}
NHibernateTest.Order order = new NHibernateTest.Order();
/**//// <summary>
/// 使用NHibernate HQL方式查询
/// </summary>
private void btnNHLoad_Click( object sender, EventArgs e )
{
string strOutput = "";
// 测试加载数据时间
DateTime dtStart = System.DateTime.Now;
IList orders = order.LoadAllByNHibernate(); // 使用NHibernate HQL方式查询
DateTime dtEnd = System.DateTime.Now;
TimeSpan ts = dtEnd - dtStart;
strOutput += "NHibernate HQL方式 : "
+ orders.Count + " 条记录， 加载时间(ms) : "
+ ts.TotalMilliseconds;
// 测试绑定数据时间
dtStart = System.DateTime.Now;
this.dgvOrders.DataSource = orders;
dtEnd = System.DateTime.Now;
ts = dtEnd - dtStart;
strOutput += " 绑定IList时间 : " + ts.TotalMilliseconds;
Console.WriteLine( strOutput );
}
/**//// <summary>
/// 使用Ado.Net DbDataAdapter方式查询
/// </summary>
private void btnADOLoad_Click( object sender, EventArgs e )
{
string strOutput = "";
// 测试加载数据时间
DateTime dtStart = System.DateTime.Now;
DataTable dtOrders = order.LoadAllByAdoNet(); // 使用Ado.Net DbDataAdapter方式查询
DateTime dtEnd = System.DateTime.Now;
TimeSpan ts = dtEnd - dtStart;
strOutput += "Ado.Net DbDataAdapter方式 : "
+ dtOrders.Rows.Count + " 条记录； 加载时间(ms) ： "
+ ts.TotalMilliseconds;
// 测试绑定数据时间
dtStart = System.DateTime.Now;
this.dgvOrders.DataSource = dtOrders;
dtEnd = System.DateTime.Now;
ts = dtEnd - dtStart;
strOutput += " 绑定IList时间 ： " + ts.TotalMilliseconds;
Console.WriteLine( strOutput );
}
}
}
运行后界面如下：
在界面两个按钮点击多次后，两者的查询时间稳定，可以作为比较。下面是输出：
NHibernate :select order0_.orderId as orderId, order0_.shippedDate as shippedD4_, order0_.shipPostalCode as shipPos10_, order0_.requiredDate as required3_, order0_.shipCountry as shipCou11_, order0_.shipVia as shipVia, order0_.orderDate as orderDate, order0_.shipAddress as shipAddr7_, order0_.shipRegion as shipRegion, order0_.shipName as shipName, order0_.shipCity as shipCity, order0_.customerId as customerId, order0_.freight as freight, order0_.employeeId as employeeId from Orders order0_
NHibernate HQL方式 : 830 条记录， 加载时间(ms) : 3334.7952 绑定IList时间 : 70.1008
NHibernate :select order0_.orderId as orderId, order0_.shippedDate as shippedD4_, order0_.shipPostalCode as shipPos10_, order0_.requiredDate as required3_, order0_.shipCountry as shipCou11_, order0_.shipVia as shipVia, order0_.orderDate as orderDate, order0_.shipAddress as shipAddr7_, order0_.shipRegion as shipRegion, order0_.shipName as shipName, order0_.shipCity as shipCity, order0_.customerId as customerId, order0_.freight as freight, order0_.employeeId as employeeId from Orders order0_
NHibernate HQL方式 : 830 条记录， 加载时间(ms) : 3304.752 绑定IList时间 : 70.1008
NHibernate :select order0_.orderId as orderId, order0_.shippedDate as shippedD4_, order0_.shipPostalCode as shipPos10_, order0_.requiredDate as required3_, order0_.shipCountry as shipCou11_, order0_.shipVia as shipVia, order0_.orderDate as orderDate, order0_.shipAddress as shipAddr7_, order0_.shipRegion as shipRegion, order0_.shipName as shipName, order0_.shipCity as shipCity, order0_.customerId as customerId, order0_.freight as freight, order0_.employeeId as employeeId from Orders order0_
NHibernate HQL方式 : 830 条记录， 加载时间(ms) : 3354.824 绑定IList时间 : 80.1152
Ado.Net DbDataAdapter方式 : 830 条记录； 加载时间(ms) ： 40.0576 绑定IList时间 ： 80.1152
Ado.Net DbDataAdapter方式 : 830 条记录； 加载时间(ms) ： 40.0576 绑定IList时间 ： 90.1296
Ado.Net DbDataAdapter方式 : 830 条记录； 加载时间(ms) ： 30.0432 绑定IList时间 ： 90.1296
NHibernate :select order0_.orderId as orderId, order0_.shippedDate as shippedD4_, order0_.shipPostalCode as shipPos10_, order0_.requiredDate as required3_, order0_.shipCountry as shipCou11_, order0_.shipVia as shipVia, order0_.orderDate as orderDate, order0_.shipAddress as shipAddr7_, order0_.shipRegion as shipRegion, order0_.shipName as shipName, order0_.shipCity as shipCity, order0_.customerId as customerId, order0_.freight as freight, order0_.employeeId as employeeId from Orders order0_
NHibernate HQL方式 : 830 条记录， 加载时间(ms) : 3334.7952 绑定IList时间 : 70.1008
Ado.Net DbDataAdapter方式 : 830 条记录； 加载时间(ms) ： 50.072 绑定IList时间 ： 90.1296
另外在网上找了一下关于NHibernate性能的讨论的有，
http://kevin-y.cnblogs.com/archive/2006/02/08/327164.html
http://wljcan.cnblogs.com/archive/2005/05/14/155495.aspx
很少，希望能有已经做过NHibernate考量的高手提供点路子，非常感谢。
