在 Fluent NHibernate 中映射人员和员工

发布于 2024-09-18 12:04:41 字数 401 浏览 10 评论 0原文

如何使用 Fluent NHibernate（实体、映射类等）映射以下查询，员工 ID 存储在标识符表中。人员表包含员工信息和非员工信息。

SELECT p.Id、p.FirstName、p.LastName

 FROM Person p

UNION ALL

SELECT e.Id, e.FirstName, e.LastName 

  FROM Employee e

INNER JOIN 标识符 i on (e.Id = i.value)

INNER JOIN 类型 t on (i.typeid = t.id and i.typeName = 'EmployeeId')

有人吗？

原文

How can I map following queries using Fluent NHibernate (entity, mapping class etc..), the employee ids are stored in identifier tables. Person table contains employee information and non-employee information.

SELECT p.Id, p.FirstName, p.LastName

 FROM Person p

UNION ALL

SELECT e.Id, e.FirstName, e.LastName 

  FROM Employee e

INNER JOIN identifier i on (e.Id = i.value)

INNER JOIN type t on (i.typeid = t.id and i.typeName = 'EmployeeId')

Anyone?

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向日葵 2024-09-25 12:04:41

您需要使用联合策略来映射您的子类。阅读 Fluent NHibernate wiki 的子类化部分，而不是调用 您可以在 ClassMap 中调用 UseUnionSubclassForInheritanceMapping 中的 DiscrimminateSubclassesOnColumn。

您最终会得到一个基类的 ClassMap ，然后是每个子类的 SubclassMap ； ClassMap 将在其构造函数中调用 UseUnionSubclassForInheritanceMapping。

像这样的东西：

public class PersonMap : ClassMap<Person>
{
  public PersonMap()
  {
     // ... mappings ...
     UseUnionSubclassForInheritanceMapping();
  }
}

public class EmployeeMap : SubclassMap<Employee>
{
  public EmployeeMap()
  {
    // ... mappings ...
  }
}

You need to use a union strategy for mapping your subclasses. Have a read of the subclassing section of the Fluent NHibernate wiki, but instead of calling DiscriminateSubclassesOnColumn in your ClassMap you'd call UseUnionSubclassForInheritanceMapping.

What you'd end up with is a ClassMap for your base-class, then a SubclassMap for each of your subclasses; the ClassMap would have a call to UseUnionSubclassForInheritanceMapping in it's constructor.

Something like this:

public class PersonMap : ClassMap<Person>
{
  public PersonMap()
  {
     // ... mappings ...
     UseUnionSubclassForInheritanceMapping();
  }
}

public class EmployeeMap : SubclassMap<Employee>
{
  public EmployeeMap()
  {
    // ... mappings ...
  }
}

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