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我对通过 NHibernate 得到的异常感到困惑和沮丧。对于这篇文章的篇幅,我深表歉意,但我已尝试包含适当的详细信息以充分解释该问题以获得一些帮助!

以下是事实:

  • 我有一个Person包含属性的类BillingManager,它也是一种Person类型。我将其映射为 FNH“参考”。
  • 我有一个ExpenseReport包含属性的类SubmittedBy,它是一种Person类型。我将其映射为 FNH“参考”。
  • 我有一个BillableTime包含属性的类Person,它是一种Person类型。我将其映射为 FNH“参考”。
  • Person包含ExpenseReport类型 (property ExpenseReports) 的集合 (IList)
  • Person包含BilledTime类型 (property Time) 的集合 (IList)

(请参阅帖子底部的类和映射。)

一切都很酷,直到我将IList<BilledTime> Time集合添加到Person. 现在,当我尝试访问时_person.Time,出现异常:

编码:

// Get billable hours
if (_person.Time == null || 
    _person.Time.Count(x => x.Project.ProjectId == project.ProjectId) == 0)
{
    // No billable time for this project
    billableHours = Enumerable.Repeat(0F, 14).ToArray();
}

例外:

could not initialize a collection: 
[MyApp.Business.Person.Time#211d3567-6e20-4220-a15c-74f8784fe47a]
[SQL: SELECT 
time0_.BillingManager_id as BillingM8_1_, 
time0_.Id as Id1_, 
time0_.Id as Id1_0_, 
time0_.ReadOnly as ReadOnly1_0_, 
time0_.DailyHours as DailyHours1_0_, 
time0_.Week_id as Week4_1_0_, 
time0_.Person_id as Person5_1_0_, 
time0_.Project_id as Project6_1_0_, 
time0_.Invoice_id as Invoice7_1_0_ 
FROM [BillableTime] time0_ 
WHERE time0_.BillingManager_id=?]

确实是无效的列名,它在表BillingManager_id中不存在。BillableTime但是,我不明白为什么 NHB 创建了这个 SQL……对我来说没有意义。在搜索解决方案时,我经常看到这个“无效的列名”异常,但似乎没有任何效果。更令人困惑的是:就像BilledTime,该ExpenseReport类型还包含对的引用Person并且它工作得很好。

我能够弄清楚的一件事是,如果我从 Person 映射References(p => p.BillingManager)(现在似乎存在一些“自我引用”问题,因为该Person.BillingManager属性本身就是对 a 的引用Person

知道这里发生了什么吗?我很茫然...

谢谢。

=== 类和映射 ===

public class Person
{
    public virtual string LastName { get; set; }
    public virtual string FirstName { get; set; }

    public virtual Person BillingManager { get; set; }

    public virtual IList<ExpenseReport> ExpenseReports { get; set; }
    public virtual IList<BillableTime> Time { get; set; }
}


public class PersonMapping : ClassMap<Person> 
{        
    public PersonMapping()
    {
        Id(p => p.UserId).GeneratedBy.Assigned();
        Map(p => p.LastName).Not.Nullable();
        Map(p => p.FirstName).Not.Nullable();

        References(p => p.BillingManager);

        HasMany(p => p.ExpenseReports).Cascade.AllDeleteOrphan();
        HasMany(p => p.Time).Cascade.AllDeleteOrphan(); 
    }
}

public class BillableTime
{
    public virtual int Id { get; private set; }
    public virtual Week Week { get; set; }
    public virtual Person Person { get; set; }
    public virtual Project Project { get; set; }
    public virtual float[] DailyHours { get; set; }
    public virtual Invoice Invoice { get; set; }
    public virtual bool ReadOnly { get; set; }
}       

public class BillableTimeMapping : ClassMap<BillableTime>
{
    public BillableTimeMapping()
    {
        Id(x => x.Id);
        References(x => x.Week);
        References(x => x.Person);
        References(x => x.Project);
        References(x => x.Invoice);
        Map(x => x.ReadOnly).Not.Nullable().Default("0");
        Map(x => x.DailyHours).Length(28);  
    }
}


public class ExpenseReport
{
    public virtual long Id { get; set; }        
    public virtual Person SubmittedBy { get; set; }             
}
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1 回答 1

2

以下行应该可以解决问题,但我不知道为什么会这样。如果我有空闲时间我会调查的。

HasMany(p => p.Time).Cascade.AllDeleteOrphan().KeyColumn("Person_Id");
于 2011-10-07T12:49:24.980 回答