nhibernate - 在 SharpArchitecture 中使用 Npgsql 时出现的问题

Question

在 SharpArchitecture 中使用 Npgsql 时，是否有人可以帮助我。我很沮丧。我使用了 Postgresql 8.4、Npgsql 2.0.11、SharpArchitecture 2.0.0.0 和 visual studio 2010。

我的示例项目名为“success”。

1)我在每个项目中都引用了Npgsql驱动，并按照如下配置我的NHibernate.config，我觉得没有问题:

<property name="connection.provider">NHibernate.Connection.DriverConnectionProvider</property>
  <property name="connection.driver_class">NHibernate.Driver.NpgsqlDriver</property>
  <property name="dialect">NHibernate.Dialect.PostgreSQLDialect</property>
  <property name="connection.connection_string">
    Server=localhost;Database=***;Encoding=UNICODE;User ID=***;Password=***;
  </property>

2)我的数据库域文件如下，一个表名为student(sno, sname, sage)，sno是PK，类型为字符串:

//student.cs
using System.Collections.Generic;
using SharpArch.Domain.DomainModel; 
namespace success.Domain {
public class student : Entity
{
        public student() { }
        public virtual string sno { get; set; }
        public virtual System.Nullable<int> sage { get; set; }
        public virtual string sname { get; set; }
    }
}

//studentMap.cs
using FluentNHibernate.Automapping.Alterations;
namespace success.Domain {
public class studentMap : IAutoMappingOverride<student>
{
    public void Override(FluentNHibernate.Automapping.AutoMapping<student> mapping)
    {
        mapping. Table("student");
        mapping.LazyLoad();
        mapping.Id(x => x.sno).GeneratedBy.Assigned().Column("sno"); 
   //I don't used Id but sno as the PK, and sno is typed string.
        mapping.Map(x => x.sage).Column("sage");
        mapping.Map(x => x.sname).Column("sname");
    }
}
}

3)为了使用非Id列表，我删除了默认的MyEntity1.cs，修改了AutoPersistenceModelGenerator.cs如下:

...
public AutoPersistenceModel Generate()
    {
        var mappings = AutoMap.AssemblyOf<studentMap>(new AutomappingConfiguration())
            .UseOverridesFromAssemblyOf<studentMap>()    //alter AutoMapping Assembly
            .OverrideAll(map => { map.IgnoreProperty("Id"); })  // ignore id property, and the program recognize the "sno" as the PK, test OK
...

4) 在 Tasks 项目中，我创建了接口(interface) IStudentRepository.cs 和类 StudentRepository.cs，修改了 NHibernateRepository，以便通过“sno”获取记录。

//IStudentRepository.cs 
using success.Domain;
using SharpArch.NHibernate.Contracts.Repositories;
namespace success.Tasks.IRepository
{
public  interface IStudentRepository:INHibernateRepository<student>
{
    student GetStudentFromSno(string sno);
}
}

//StudentRepository.cs 
using SharpArch.NHibernate;
using success.Domain;
using success.Tasks.IRepository;
using NHibernate;
using NHibernate.Criterion;
namespace success.Tasks.Repository
{
public class StudentRepository:NHibernateRepository<student>,IStudentRepository
{
    public student GetStudentFromSno(string sno)    //define a new method to fatch record by sno
    {
        ICriteria criteria = Session.CreateCriteria<student>()     
            .Add(Expression.Eq("sno", sno));     
        return criteria.UniqueResult() as student;
    }
}
}

5)在MVC工程中，创建StudentController.cs，使用StudentRepository代替NHibernateRepository，关键代码如下:

 ...
 public ActionResult Index()
    {
        var students = this.studentRepository.GetAll();
        return View(students);
    }

    private readonly StudentRepository studentRepository;

    public StudentsController(StudentRepository studentRepository)
    {
        this.studentRepository = studentRepository;
    }

    [Transaction]
    [HttpGet]
    public ActionResult CreateOrUpdate(string sno)
    {
        student s = studentRepository.GetStudentFromSno(sno);
        return View(s);
    }

    [Transaction]
    [ValidateAntiForgeryToken]
    [HttpPost]
    public ActionResult CreateOrUpdate(student s)
    {
        if (ModelState.IsValid && s.IsValid())
        {
            studentRepository.SaveOrUpdate(s);
            return this.RedirectToAction("Index");
        }
        return View(s);
    }

    [Transaction]
    [ValidateAntiForgeryToken]
    [HttpPost]
    public ActionResult Delete(string sno)
    {
        var s = studentRepository.GetStudentFromSno(sno);
        if (s == null)
            return HttpNotFound();
        studentRepository.Delete(s);
        return this.RedirectToAction("Index");
    }
...

6) 我创建了 View ，到目前为止一切正常，但在最后一步，项目显示如下错误。但是把项目改成SQL Server 2005平台就没有问题了。错误出现在 Global.asax.cs:

...
private void InitialiseNHibernateSessions()
{
NHibernateSession.ConfigurationCache = new NHibernateConfigurationFileCache();
//the follow line codes make error when using Npgsql, but no error when using SQL Server 2005 
NHibernateSession.Init(
this.webSessionStorage,
new[] { Server.MapPath("~/bin/success.Infrastructure.dll") },
new AutoPersistenceModelGenerator().Generate(),
Server.MapPath("~/NHibernate.config"));
}
...

错误详情如下:

System.NotSupportedException was unhandled by user code
  Message=Specified method is not supported.
  Source=Npgsql
  StackTrace:
   at Npgsql.NpgsqlConnection.GetSchema(String collectionName, String[] restrictions) in C:\projects\Npgsql2\src\Npgsql\NpgsqlConnection.cs:line 970
   at Npgsql.NpgsqlConnection.GetSchema(String collectionName) in C:\projects\Npgsql2\src\Npgsql\NpgsqlConnection.cs:line 946
   at NHibernate.Dialect.Schema.AbstractDataBaseSchema.GetReservedWords()
   at NHibernate.Tool.hbm2ddl.SchemaMetadataUpdater.GetReservedWords(Dialect dialect, IConnectionHelper connectionHelper)
   at NHibernate.Tool.hbm2ddl.SchemaMetadataUpdater.Update(ISessionFactory sessionFactory)
   at NHibernate.Impl.SessionFactoryImpl..ctor(Configuration cfg, IMapping mapping, Settings settings, EventListeners listeners)
  InnerException: 

请帮帮我!我觉得自己没有最后的努力就功亏一篑。我很沮丧!

Answer 1

你看过this了吗？ ？

将“hbm2ddl.keywords”、“none”添加到您的 Nhibernate.config，看看是否能解决您的问题。