Question

我有三张桌子：

人（Id，FirstName）
组织（身份证，姓名）
PersonOrganization（PersonId，OrganizationId，Details）多对多表

当我第一次使用Fluent NHibernate映射它时，我在PersonOrganization表中没有详细信息列，并在PersonMap和OrganizationMap中使用HasManyToMany映射它（不需要创建PersonOrganization域对象或映射）。我可以写下面的代码：

Organization org = new Organization { Name = "org" };
People people = new People { FirstName = "firstname", Organization = org };

peopleRepository.Add(people);          // ISession.Save(people)
unitOfWork.Commit();                   // ITransaction.Commit()

NHhibernate愉快地将数据提交给所有三个表。

当我在PersonOrganization表中添加详细信息列时，问题出现了。经过一些研究后发现，我现在必须创建一个新的PersonOrganization域对象，并为Person和Organization映射和设置HasMany关系。我的更新模型和地图如下：

public class People
{
    public People()
    {
        LinkToOrganization = new List<PeopleOrganization>();
    }

    public virtual int Id { get; set; }
    public virtual string FirstName { get; set; }
    public virtual IList<PeopleOrganization> LinkToOrganization { get; set; }
}

public class Organization
{
    public Organization()
    {
        LinkToPeople = new List<PeopleOrganization>();
    }

    public virtual int Id { get; set; }
    public virtual string Name { get; set; }
    public virtual IList<PeopleOrganization> LinkToPeople { get; set; }
}

public class PeopleOrganization
{
    public virtual People People { get; set; }
    public virtual Organization Organization { get; set; }
    public virtual string Details { get; set; }
}

public class PeopleMap : ClassMap<People>
{
    public PeopleMap()
    {
        Id(p => p.Id);
        Map(p => p.FirstName).Length(100);

        HasMany(x => x.LinkToOrganization)
            .Table("PeopleOrganization")
            .KeyColumn("PeopleId")
            .AsBag()
            .Inverse();
    }
}

public class OrganizationMap : ClassMap<Organization>
{
    public OrganizationMap()
    {
        Id(p => p.Id);
        Map(p => p.Name).Length(50);

        HasMany(x => x.LinkToPeople)
            .Table("PeopleOrganization")
            .KeyColumn("OrganizationId")
            .AsBag()
            .Inverse();
    }
}

public class PeopleOrganizationMap : ClassMap<PeopleOrganization>
{
    public PeopleOrganizationMap()
    {
        CompositeId()
            .KeyReference(p => p.People, "PeopleId")
            .KeyReference(p => p.Organization, "OrganizationId");

        Map(p => p.Details).Length(100);
    }
}

我现在必须编写以下代码：

People people = new People { FirstName = "firstname" };
Organization org = new Organization { Name = "org" };
PeopleOrganization po = new PeopleOrganization { People = people, Organization = org, Details = "details" };

peopleRepository.Add(people);          // ITransaction.Begin() ISession.Save(people)
organizationRepository.Add(org);       // ISession.Save(org)
peopleOrganizationRepository.Add(po);  // ISession.Save(po)

unitOfWork.Commit();                   // ITransaction.Commit()

我的问题是：

我的映射是否正确设置为支持这种多对多方案？
我是否有办法让我能够做到以下（这将写入所有三个表）：

-

People people = new People { FirstName = "firstname" };
Organization org = new Organization { Name = "org" };
PeopleOrganization po = new PeopleOrganization { People = people, Organization = org, Details = "details" };

peopleRepository.Add(people);          // Just ONE ISession.Save(people)

unitOfWork.Commit();                   // ITransaction.Commit()

非常感谢任何输入。

由于

Answer 1

首先，您需要将新创建的PeopleOrganization添加到两个实体（Organization和People）的集合中。然后，如果您向Cascade.All()链添加HasMany，则保存应向下传播（级联）到PeopleOrganization，然后传播到Organization。

作为纯粹的语义建议，我建议将PeopleOrganization创建封装到Person上的方法中。像这样：

class Person
{
  public void AddOrganization(Organization org, string details)
  {
    var link = new PeopleOrganization { ... };

    LinkToOrganization.Add(link)
    org.LinkToPeople.Add(link);
  }
}

这样你就不必自己处理创建内在实体。

流利的Nhibernate多对多问题

1 个答案: