Question

我试图让这个FluentNHibernate映射工作。我有三个表Person，Employee和Employer。 Employee表扩展了Person表的属性，它的主键是Person表的外键。

Employee表还有一个Empireyer表的foriegn键。雇主可以拥有许多雇员，每个雇员都是一个人。

我使用FluentNHibernate来映射这三个表。我为Employee使用了一个Joined Subclass映射 - ＆gt;人

我正在努力让映射工作，以便我可以获得雇主及其相关员工（急切的提取），但生成的select语句选择两者上的EmployerId Employee表（好）和Person表（坏）导致错误（见下文）。

选择 employees0_.EmployerId 作为Employee5_2_，employees0_。 PersonId为PersonId2_，employees0_.PersonId为PersonId1_1_，employees0_.FirstN ame as FirstName1_1_，employees0_.LastName as LastName1_1_，employees0_1_.PayRat e为PayRate2_1_， employees0_1_.EmployerId 为EmployerId2_1_，employer1_.Employe rdd as EmployerId0_0_，employer1_.Name as Name0_0_ FROM [Person] employees0_ lef t外部联接雇员employees0_1_ on employees0_.PersonId = employees0_1_.Employ eeId在employee0_1_.EmployerId = employer1上留下外联合[雇主]雇主1_ .EmployerId WHERE employees0 .Employee.EmployerId = @ p0; @ p0 = 1

请在下面找到架构，类和Fluent Mappings。我做错了什么？

我为这些表定义了类，如下所示：

public class Person
{
    public int PersonId { get; set; }
    public string PersonClassification { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }
}

public class Employer
{
    public int EmployerId { get; set; }
    public string Name { get; set; }
    public IList<Employee> Employees { get; set; }
}

public class Employee : Person
{
    public Employer Employer { get; set; }
    public decimal PayRate { get; set; }

}

public class PersonMap : ClassMap<Person>
{
    public PersonMap()
    {
        Id(x => x.PersonId).Column("PersonId").GeneratedBy.Identity();
        Map(x => x.FirstName);
        Map(x => x.LastName);
        DiscriminateSubClassesOnColumn("PersonClassification");
    }
}

public class EmployeeMap : SubclassMap<Employee>
{
    public EmployeeMap()
    {
        this.DiscriminatorValue("Employee");

        Join
            (
                "Employee",
                join =>
                {
                    join.Optional();
                    join.KeyColumn("EmployeeId");
                    join.Map(x => x.PayRate);
                    join.References(x => x.Employer).Column("EmployerId");
                }
            );
    }
}

public class EmployerMap : ClassMap<Employer>
{
    public EmployerMap()
    {
        Id(x => x.EmployerId).Column("EmployerId").GeneratedBy.Identity();
        Map(x => x.Name);
        HasMany(x => x.Employees).KeyColumn("Employee.EmployerId");
    }
}

FluentNHibernate。我需要将hasmany关系映射到连接的子类实体类型

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