Fluent Nhibernate 自动映射和 Guid/UniqueIdentifiers 作为主键字段的问题

发布于 2024-08-03 16:46:32 字数 4861 浏览 7 评论 0原文

我正在尝试使用 Fluent-NHibernate 自动映射功能(在最新版本的软件中),但在使用 Guid 作为主键字段时遇到了问题。如果我使用整数字段作为主键,则表会成功生成,并且所有 Nhibernate 功能似乎都可以正常工作。仅供参考,我正在使用 NHibernate 生成数据库表。

这里有几个带有整数 ID 的类。

using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.ComponentModel.DataAnnotations;
using System.Reflection;

namespace Sample.Data.Entities
{
    public class Employee
    {
        public virtual int Id { get; private set; }
        public virtual string FirstName { get; set; }
        public virtual string LastName { get; set; }
        public virtual Store Store { get; set; }
    }

    public class Product
    {
        public virtual int Id { get; private set; }
        public virtual string Name { get; set; }
        public virtual double Price { get; set; }
        public virtual IList<Store> StoresStockedIn { get; private set; }

        public Product()
        {
            StoresStockedIn = new List<Store>();
        }
    }

    public class Store
    {
        public virtual int Id { get; private set; }
        public virtual string Name { get; set; }
        public virtual IList<Product> Products { get; set; }
        public virtual IList<Employee> Staff { get; set; }

        public Store()
        {
            Products = new List<Product>();
            Staff = new List<Employee>();
        }

        public virtual void AddProduct(Product product)
        {
            product.StoresStockedIn.Add(this);
            Products.Add(product);
        }

        public virtual void AddEmployee(Employee employee)
        {
            employee.Store = this;
            Staff.Add(employee);
        }
    }
}

以下是带有 GUID 的相同类。

using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.ComponentModel.DataAnnotations;
using System.Reflection;

namespace Sample.Data.Entities
{
    public class Employee
    {
        public virtual Guid Id { get; private set; }
        public virtual string FirstName { get; set; }
        public virtual string LastName { get; set; }
        public virtual Store Store { get; set; }
    }

    public class Product
    {
        public virtual Guid Id { get; private set; }
        public virtual string Name { get; set; }
        public virtual double Price { get; set; }
        public virtual IList<Store> StoresStockedIn { get; private set; }

        public Product()
        {
            StoresStockedIn = new List<Store>();
        }
    }

    public class Store
    {
        public virtual Guid Id { get; private set; }
        public virtual string Name { get; set; }
        public virtual IList<Product> Products { get; set; }
        public virtual IList<Employee> Staff { get; set; }

        public Store()
        {
            Products = new List<Product>();
            Staff = new List<Employee>();
        }

        public virtual void AddProduct(Product product)
        {
            product.StoresStockedIn.Add(this);
            Products.Add(product);
        }

        public virtual void AddEmployee(Employee employee)
        {
            employee.Store = this;
            Staff.Add(employee);
        }
    }
}

这是我的配置。

    return Fluently.Configure()
      .Database(MsSqlConfiguration.MsSql2008
      .ConnectionString(c => c.FromConnectionStringWithKey("AAAConnectionString"))
      .UseReflectionOptimizer()              
      .AdoNetBatchSize(25)
      .DefaultSchema("dbo")
      .Cache(c => c
        .UseQueryCache()
        .ProviderClass<HashtableCacheProvider>())
      .ShowSql())
      .Mappings(m=>m.AutoMappings
        .Add(AutoMap.AssemblyOf<Sample.Data.Entities.Product>()                
        .Where(type => type.Namespace == "Sample.Data.Entities.Product")
        .Conventions.AddFromAssemblyOf<Sample.Data.Fluent.Conventions.PrimaryKeyNameConvention>()
        ))
      .ExposeConfiguration(BuildSchema)              
      .BuildSessionFactory();

为了解决这个问题,我尝试生成约定(见下文):1)命名 Id 字段(尽管我认为它应该是不必要的)和 2)生成 Id(我认为这是自动的)。我不确定发生了什么或者为什么这不起作用。

public class PrimaryKeyNameConvention : IIdConvention
{
    public bool Accept(IIdentityInstance id)
    {
        return true;
    }
    public void Apply(IIdentityInstance id)
    {
        id.Column("Id");                
    }
}

public class PrimaryKeyGeneratorConvention : IIdConvention
{
    public bool Accept(IIdentityInstance id)
    {
        return true;
    }
    public void Apply(IIdentityInstance id)
    {
        id.GeneratedBy.GuidComb();
    }
}

另外,如果我关闭自动映射并使用流畅配置的映射,则表会成功生成。

这让我抓狂,我相信这可能是一个快速解决方案。有什么想法吗?

谢谢你!

安东尼

I am attempting to use the Fluent-NHibernate automapping functionality (in the latest version of the software) and am running into problems using Guids as the Primary Key fields. If I use integer fields for the primary keys, the tables are generated successfully and all Nhibernate functionality seems to work fine. FYI, I am using NHibernate to generate my database tables.

Here are a couple of classes with integer IDs.

using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.ComponentModel.DataAnnotations;
using System.Reflection;

namespace Sample.Data.Entities
{
    public class Employee
    {
        public virtual int Id { get; private set; }
        public virtual string FirstName { get; set; }
        public virtual string LastName { get; set; }
        public virtual Store Store { get; set; }
    }

    public class Product
    {
        public virtual int Id { get; private set; }
        public virtual string Name { get; set; }
        public virtual double Price { get; set; }
        public virtual IList<Store> StoresStockedIn { get; private set; }

        public Product()
        {
            StoresStockedIn = new List<Store>();
        }
    }

    public class Store
    {
        public virtual int Id { get; private set; }
        public virtual string Name { get; set; }
        public virtual IList<Product> Products { get; set; }
        public virtual IList<Employee> Staff { get; set; }

        public Store()
        {
            Products = new List<Product>();
            Staff = new List<Employee>();
        }

        public virtual void AddProduct(Product product)
        {
            product.StoresStockedIn.Add(this);
            Products.Add(product);
        }

        public virtual void AddEmployee(Employee employee)
        {
            employee.Store = this;
            Staff.Add(employee);
        }
    }
}

Here are the same classes with GUIDs.

using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.ComponentModel.DataAnnotations;
using System.Reflection;

namespace Sample.Data.Entities
{
    public class Employee
    {
        public virtual Guid Id { get; private set; }
        public virtual string FirstName { get; set; }
        public virtual string LastName { get; set; }
        public virtual Store Store { get; set; }
    }

    public class Product
    {
        public virtual Guid Id { get; private set; }
        public virtual string Name { get; set; }
        public virtual double Price { get; set; }
        public virtual IList<Store> StoresStockedIn { get; private set; }

        public Product()
        {
            StoresStockedIn = new List<Store>();
        }
    }

    public class Store
    {
        public virtual Guid Id { get; private set; }
        public virtual string Name { get; set; }
        public virtual IList<Product> Products { get; set; }
        public virtual IList<Employee> Staff { get; set; }

        public Store()
        {
            Products = new List<Product>();
            Staff = new List<Employee>();
        }

        public virtual void AddProduct(Product product)
        {
            product.StoresStockedIn.Add(this);
            Products.Add(product);
        }

        public virtual void AddEmployee(Employee employee)
        {
            employee.Store = this;
            Staff.Add(employee);
        }
    }
}

Here is my configuration.

    return Fluently.Configure()
      .Database(MsSqlConfiguration.MsSql2008
      .ConnectionString(c => c.FromConnectionStringWithKey("AAAConnectionString"))
      .UseReflectionOptimizer()              
      .AdoNetBatchSize(25)
      .DefaultSchema("dbo")
      .Cache(c => c
        .UseQueryCache()
        .ProviderClass<HashtableCacheProvider>())
      .ShowSql())
      .Mappings(m=>m.AutoMappings
        .Add(AutoMap.AssemblyOf<Sample.Data.Entities.Product>()                
        .Where(type => type.Namespace == "Sample.Data.Entities.Product")
        .Conventions.AddFromAssemblyOf<Sample.Data.Fluent.Conventions.PrimaryKeyNameConvention>()
        ))
      .ExposeConfiguration(BuildSchema)              
      .BuildSessionFactory();

To work around the issue, I attempted to generate conventions (see below) for 1) naming the Id field (although I thought it should have been unnecessary) and for 2) generating the Id (which I thought would have been automatic). I am unsure what is happening or why this is not working.

public class PrimaryKeyNameConvention : IIdConvention
{
    public bool Accept(IIdentityInstance id)
    {
        return true;
    }
    public void Apply(IIdentityInstance id)
    {
        id.Column("Id");                
    }
}

public class PrimaryKeyGeneratorConvention : IIdConvention
{
    public bool Accept(IIdentityInstance id)
    {
        return true;
    }
    public void Apply(IIdentityInstance id)
    {
        id.GeneratedBy.GuidComb();
    }
}

Also, if I turn automapping off and use Fluently configured map the tables are generated successfully.

This is driving me nuts, and I am sure it is probably a quick fix. Any ideas?

Thank you!

Anthony

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安稳善良 2024-08-10 16:46:32

显然,Fluent Nhibernate 1.0RC 版和 1.0 版存在问题。但是,如果您从 SVN 主干下载最新版本,一切都会完美运行。看来这个问题只是代码中的一个错误,现已得到纠正。

另外,我应该指出 James Gregory、Paul Batum 以及其他人可能正在积极致力于 Fluent NHibernate。该产品正在快速发展,并且在过去的几个月里代码发生了重大变化。

Apparently, there was an issue in the Fluent Nhibernate version 1.0RC and version 1.0. However, if you download the latest version from the SVN trunk, every thing works perfectly. It appears that the problem was simply a bug in the code which has now been corrected.

Also, I should note that James Gregory, Paul Batum, and perhaps others, are actively working on Fluent NHibernate. The product is evolving pretty dramatically and there have been significant changes to the code over the last couple of months.

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