Fluent nhibernate 具有列默认值的每类复合表映射

您可以在TPC映射中为复合零件设置默认值吗？我有一个实体集类，如下所示：

public class Employee()
{
    public EmployeeIdentity Id;       
    public double MonthlySalaryBase;
}

public class EmployeeIdentity()
{
    public int DepartmentId;
    public int DepartmentEmployeeId;
} 

public class SalesEmployee(): Employee
{
   public double ComissionRate;
}

public class ProgrammerEmployee(): Employee
{
   public int WeeklyExtraHoursAllowed;
}

public class EmployeeMap: ClassMap<Employee>
{
   public void Employee()
   {
       Table("employee");
        CompositeId().ComponentCompositeIdentifier<EmployeeIdentity)(x => x.Id).
            KeyProperty(x => x.Id.DepartmentId, "id_department").
            KeyProperty(x => x.Id.DepartmentEmployeeId, "id_department_employee_id");
        Map(x => x.MonthlySalaryBase);
   }
}

public class SalesEmployeeMap: SubclassMap<SalesEmployee>
{
   Table("sales_employee");
   KeyColumn("id_department");
   KeyColumn("id_department_employee_id");
   Map(x => x.ComissionRate)
}

public class ProgrammerEmployeeMap: SubclassMap<ProgrammerEmployee>
{
   Table("programmer_employee");
   KeyColumn("id_department");
   KeyColumn("id_department_employee_id");
   Map(x => x.WeeklyExtraHoursAllowed)
}

我用Fluent NHibernate将其映射如下：

public class Employee()
{
    public EmployeeIdentity Id;       
    public double MonthlySalaryBase;
}

public class EmployeeIdentity()
{
    public int DepartmentId;
    public int DepartmentEmployeeId;
} 

public class SalesEmployee(): Employee
{
   public double ComissionRate;
}

public class ProgrammerEmployee(): Employee
{
   public int WeeklyExtraHoursAllowed;
}

public class EmployeeMap: ClassMap<Employee>
{
   public void Employee()
   {
       Table("employee");
        CompositeId().ComponentCompositeIdentifier<EmployeeIdentity)(x => x.Id).
            KeyProperty(x => x.Id.DepartmentId, "id_department").
            KeyProperty(x => x.Id.DepartmentEmployeeId, "id_department_employee_id");
        Map(x => x.MonthlySalaryBase);
   }
}

public class SalesEmployeeMap: SubclassMap<SalesEmployee>
{
   Table("sales_employee");
   KeyColumn("id_department");
   KeyColumn("id_department_employee_id");
   Map(x => x.ComissionRate)
}

public class ProgrammerEmployeeMap: SubclassMap<ProgrammerEmployee>
{
   Table("programmer_employee");
   KeyColumn("id_department");
   KeyColumn("id_department_employee_id");
   Map(x => x.WeeklyExtraHoursAllowed)
}

公共类EmployeeMap:ClassMap
{
公职人员（）
{
表（“员工”）；
CompositeId（）.ComponentCompositeId标识符x.Id）。
KeyProperty（x=>x.Id.DepartmentId，“Id\u部门”）。
KeyProperty（x=>x.Id.DepartmentEmployeeId，“Id\u department\u employee\u Id”）；
Map（x=>x.MonthlySalaryBase）；
}
}
公共类SalesEmployeeMap:子类映射
{
表（“销售人员”）；
KeyColumn（“id_部门”）；
KeyColumn（“id、部门、员工id”）；
地图（x=>x.ComissionRate）
}
公共类ProgrammerEmployeeMap:子类映射
{
表（“程序员和员工”）；
KeyColumn（“id_部门”）；
KeyColumn（“id、部门、员工id”）；
地图（x=>x.WeeklyExtraHoursAllowed）
}

---

有了这个，我必须在程序员表和销售表中都有一个id_department列，但是这个列始终是相同的（所有销售员工都有相同的部门id）。我想用一个常量替换两个子类映射中id_department的KeyColumn，从而避免这两个表中的id_department列。这是可能的？

这似乎在Hibernate（Java）中支持此功能，但在NHibernate中不支持