Nhibernate配置和访问数据问题

今天开始用Nhibernate做为自己的ORM,但是做的过程中确实遇到了好多问题，现在将问题收集起来以防日后出现相同的问题，

总结下：

这就是我的整个项目，现在配置下hibernate.cfg.xml

<?xml version="1.0" encoding="utf-8"?>


<hibernate-configuration xmlns="urn:nhibernate-configuration-2.2" >
   <session-factory name="NHibernate.Test">
       <property name="connection.driver_class">NHibernate.Driver.SqlClientDriver</property>
       <property name="connection.connection_string">
      server=127.0.0.1;database=Subject;uid=sa;pwd=zhangwei
    </property>
       <property name="dialect">NHibernate.Dialect.MsSql2008Dialect</property>
</session-factory>
</hibernate-configuration>

现在新建User.cs类：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Subject.Model
{
    /// <summary>
    /// 用户表
    /// </summary>
    public class User
    {
        /// <summary>
        /// 用户id
        /// </summary>
        public string Id { get; set; }

        /// <summary>
        /// 名称
        /// </summary>
        public string Name { get; set; }

        /// <summary>
        /// 密码
        /// </summary>
        public string Password { get; set; }

        /// <summary>
        /// 性别
        /// </summary>
        public string Sex { get; set; }

        /// <summary>
        /// 个人简介
        /// </summary>
        public string BriefIntroduction { get; set; }

        /// <summary>
        /// 创建时间
        /// </summary>
        public DateTime? CreateDt { get; set; }
    }
}

现在映射这个User.cs类，新建User.hbm.xml文件并且进行配置，如下：

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"
    namespace="Subject.Model" assembly="Subject.Model">
<class name="Subject.Model.User" table="User" lazy="false">
    <id name="Id">
      <column name="Id" sql-type="varchar(40)" not-null="true"/>
      <generator class="uuid.hex" />
    </id>
    <property name="Name">
      <column name="Name" sql-type="varchar(20)" not-null="false" />
    </property>
    <property name="Password">
      <column name="Password" sql-type="varchar(20)" not-null="false" />
    </property>
    <property name="Sex">
      <column name="Sex" sql-type="varchar(2)" not-null="false" />
    </property>
    <property name="BriefIntroduction">
      <column name="BriefIntroduction" sql-type="varchar(500)" not-null="false" />
    </property>
    <property name="CreateDt">
      <column name="CreateDt" sql-type="datetime" not-null="false" />
    </property>
</class>
</hibernate-mapping>

注意设置User.hbm.xml文件属性，XML文件的默认生成操作为“内容”，这里需要修改为“嵌入的资源”，

然后测试：

public IList<User> Get()
        {
            try
            {
                return _session.CreateQuery("from Subject.Model.User").List<User>();
            }
            catch (Exception e)
            {
                throw;
            }
        }