“无法执行查询错误”在 Web 服务与 NHibernate 中

正如标题所说，我收到此错误：

无法执行查询
[ 选择this_。Id 作为 Id5_0_，this_。用户名为 Username5_0_，this_。PasswordHash as Password3_5_0_， this_.盐作为Salt5_0_，this_。令牌作为Token5_0_，this_。TokenStamp as TokenStamp5_0_，this_。角色作为Role5_0_来自用户this_]">
断点时出错。

我正在尝试在数据库中使用用户进行简单的登录，用户在其中输入用户名和密码哈希。我有一个用户数据，其中每列都有管理员进行调试。

这是我的代码：

SQL Server 数据库：

User表：

CREATE TABLE [dbo].[User] 
(
    [Id]           UNIQUEIDENTIFIER NOT NULL,
    [Username]     NVARCHAR (50)    NULL,
    [PasswordHash] CHAR (64)        NOT NULL,
    [Salt]         CHAR (64)        NOT NULL,
    [Role]         UNIQUEIDENTIFIER NOT NULL,
    [Token]        NVARCHAR (50)    NOT NULL,
    [TokenStamp]   DATETIME         NULL,
    CONSTRAINT [PK_User] PRIMARY KEY CLUSTERED ([Id] ASC),
    CONSTRAINT [FK_User_Role] FOREIGN KEY ([Role]) REFERENCES [dbo].[Role] ([Id])
);

Role表：

CREATE TABLE [dbo].[Role]  
(
    [Id]   UNIQUEIDENTIFIER NOT NULL,
    [Name] NVARCHAR (50)    NULL,
    CONSTRAINT [PK_Role] PRIMARY KEY CLUSTERED ([Id] ASC)
);

WebService.cs ：

using System.Linq;
using System.Net;
using System.Web.Services;
using NHibernate;
using Models;
[WebService(Namespace = "http://LambdAlarm.com/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
public class LambdAlarmWebService : WebService
{
    [WebMethod]
    public HttpStatusCode Login(string username, string passwordHash)
    {
        var factory = SessionFactory.Instance;
        var session = factory.OpenSession();
        var result = session.QueryOver<User>().List<User>();
        var user = new User();
        var login = result.FirstOrDefault(u => u.Username == username);
        if (user.Username == login.Username)
        {
            return HttpStatusCode.OK;
        }
        return HttpStatusCode.NotFound;
    }
}

User型号：

using System;
namespace Models
{
    public class User : EntityBase
    {
        public virtual string Username { get; set; }
        public virtual string PasswordHash { get; set; }
        public virtual string Salt { get; set; }
        public virtual Role Role { get; set; }
        public virtual string Token { get; set; }
        public virtual DateTime TokenStamp { get; set; }
    }
}

Role型号：

namespace Models
{
    public class Role : EntityBase
    {
        public virtual string Name { get; set; }
    }
}

EntityBase ：(具有一个Guid属性的类，由所有模型继承(

using System;
namespace Models
{
    public class EntityBase
    {
        public virtual Guid Id { get; set; }
    }
}

UserMap ： (冬眠映射(

using FluentNHibernate.Mapping;
using Models;
namespace NHibernate.Mapping
{
    public class UserMap : ClassMap<User>
    {
        public UserMap()
        {
            Table("User");
            Id(x => x.Id).GeneratedBy.GuidComb();
            LazyLoad();
            References(x => x.Role).Column("Role");
            Map(x => x.Username).Column("Username");
            Map(x => x.PasswordHash).Column("PasswordHash").Not.Nullable();
            Map(x => x.Salt).Column("Salt").Not.Nullable();
            Map(x => x.Token).Column("Token").Not.Nullable();
            Map(x => x.TokenStamp).Column("TokenStamp");
        }
    }
}

RoleMap ：

using FluentNHibernate.Mapping;
using Models;
namespace NHibernate.Mapping
{
    public class RoleMap : ClassMap<Role>
    {
        public RoleMap()
        {
            Table("Role");
            Id(x => x.Id).GeneratedBy.GuidComb();
            LazyLoad();
            Map(x => x.Name).Column("Name");
        }
    }
}

SessionFactory ：

using FluentNHibernate.Cfg;
using FluentNHibernate.Cfg.Db;
using Models;
using NHibernate.Conventions;
namespace NHibernate
{
    public static class SessionFactory
    {
        private static ISessionFactory _sessionFactory;
        public static ISessionFactory Instance
        {
            get
            {
                if (_sessionFactory == null)
                {
                    _sessionFactory = CreateSessionFactory();
                }
                return _sessionFactory;
            }
        }
        private static ISessionFactory CreateSessionFactory()
        {
            return Fluently.Configure()
                        .Database(MsSqlConfiguration.MsSql2012
                            .ConnectionString(c => c.FromConnectionStringWithKey("DatabaseConnectionString")))
                        .Mappings(m =>
                        {
                            m.FluentMappings.Conventions.AddFromAssemblyOf<CustomForeignKeyConvention>();
                            m.FluentMappings.AddFromAssemblyOf<EntityBase>();
                        })
                        .BuildSessionFactory();
        }
    }
}

Conventions ：

using FluentNHibernate;
using FluentNHibernate.Conventions;
namespace NHibernate.Conventions
{
    public class CustomForeignKeyConvention : ForeignKeyConvention
    {
        protected override string GetKeyName(Member property, System.Type type)
        {
            if (property == null)
            {
                return type.Name;
            }
            return property.Name;
        }
    }
}

差不多就是这样了。如果有人可以帮忙，将不胜感激...

Table("User"); 

Table("`User`");