entity-framework - EF 5RC 表拆分为两个以上实体

Question

有人可以提供示例或解释如何使用 EF 5 RC Code First 上的数据注释将表拆分为两个以上实体吗？

我有 4 个实体，我想将其映射到一张表中。其中每一个的代码是:

[Table("PatientDataEntities")]
public class PatientDataEntity
{
    [Key]
    [ForeignKey("UserFullName")]
    public virtual Guid Id { get; set; }

    public virtual UserFullNameEntity UserFullName { get; set; }

    public virtual GeneralData GenData {get; set;}

    [ForeignKey("Id")]
    public virtual PersonalPatientDataEntity PersonalData { get; set; }

    [ForeignKey("Id")]
    public virtual MedicalPatientDataEntity MedicalData { get; set; }

    [ForeignKey("Id")]
    public virtual FinancialPatientDataEntity FinancialData { get; set; }

} 

[Table("PatientDataEntities")]
public class PersonalPatientDataEntity
{
    [Key]
    [ForeignKey("UserFullName")]
    public virtual Guid Id { get; set; }

    public virtual UserFullNameEntity UserFullName { get; set; }

    [ForeignKey("Id")]
    public virtual MedicalPatientDataEntity MedicalPatientData { get; set; }

    [ForeignKey("Id")]
    public virtual FinancialPatientDataEntity FinancialPatientData { get; set; }

    [ForeignKey("Id")]
    public virtual PatientDataEntity PatientData { get; set; }

    [DataType(DataType.DateTime)]
    public virtual DateTime Birthdate { get; set; }

    public virtual Gender Sex { get; set; }

    public virtual MaritalStatus MStatus { get; set; }

    public virtual byte Children { get; set; }

    public virtual string Education { get; set; }

    public string Profession { get; set; }

} 


[Table("PatientDataEntities")]
public class MedicalPatientDataEntity
{
    [Key]
    [ForeignKey("UserFullName")]
    public virtual Guid Id { get; set; }

    public virtual UserFullNameEntity UserFullName { get; set; }

    [ForeignKey("Id")]
    public virtual PersonalPatientDataEntity PersonalData { get; set; }

    [ForeignKey("Id")]
    public virtual FinancialPatientDataEntity FinancialData { get; set; }

    [ForeignKey("Id")]
    public virtual PatientDataEntity PatientData { get; set; }

    public virtual string ClinicalHistoryNumber { get; set; }

    public virtual BiologicalState State { get; set; }

    public virtual Guid PhysicianId { get; set; }

    public virtual DateTime? RegisterDate { get; set; }

    public virtual bool AcceptsDataTreatment { get; set; }

    public virtual bool AcceptsImageTreatment { get; set; }

    public virtual /*List<Allergy>*/ string Allergies { get; set; }

    public virtual /*List<Surgery>*/ string Surgeries { get; set; }

    public virtual /*List<Medication>*/ string Medications { get; set; }

    public virtual /*List<MedicalPrecedent>*/ string MedicalPrecedents { get; set; }

    [DataType(DataType.MultilineText)]
    public virtual string Family { get; set; }

    public virtual string Nicotinism { get; set; }

    public virtual float? Weight { get; set; }

    public virtual float? Height { get; set; }

    [NotMapped]
    public virtual float? BodyMassIndex { get; set; }

    public virtual string Remarks { get; set; }
} 


[Table("PatientDataEntities")]
public class FinancialPatientDataEntity
{
    [Key]
    [ForeignKey("UserFullName")]
    public virtual Guid Id { get; set; }

    public virtual UserFullNameEntity UserFullName { get; set; }

    [ForeignKey("Id")]
    public virtual PersonalPatientDataEntity PersonalData { get; set; }

    [ForeignKey("Id")]
    public virtual MedicalPatientDataEntity MedicalData { get; set; }

    [ForeignKey("Id")]
    public virtual PatientDataEntity PatientData { get; set; }

    public virtual string KindOfPatient { get; set; }

    public virtual string Isapre { get; set; }

} 

我的背景是这样的:

public class MedicDbContext : DbContext
{
    public DbSet<UserFullNameEntity> UsersFullName { get; set; }
    public DbSet<MedicDb.Patient.PatientDataEntity> PatientDataEntities { get; set; }

    public DbSet<MedicDb.Patient.Personal.PersonalPatientDataEntity> PersonalPatientDataEntities { get; set; }

    public DbSet<MedicDb.Patient.Financial.FinancialPatientDataEntity> FinancialPatientDataEntities { get; set; }

    public DbSet<MedicDb.Patient.Medical.MedicalPatientDataEntity> MedicalPatientDataEntities { get; set; }
} 

当我运行时，我收到以下异常:

An exception of type 'System.InvalidOperationException' occurred in EntityFramework.DLL but was not handled in user code

Additional information: Unable to determine the principal end of an association between the types 'MedicDb.Patient.Medical.MedicalPatientDataEntity' and 'MedicDb.Patient.Personal.PersonalPatientDataEntity'. The principal end of this association must be explicitly configured using either the relationship fluent API or data annotations.

我在这里做错了什么？我真的需要一些帮助。

Answer 1

好吧，我解决了这个问题，我想主要原因是我对这个主题的无知，[ForeignKey] 属性必须仅位于关系的一端，这修复了异常，但使 4 个实体位于同一张表，它们 4 之间必须存在一对一的关系，这看起来有点不自然，但这是唯一的工作方式。因此，最后我没有拆分我的表，而是创建 4 个独立的表，这些表不是在 4 个表之间而是在 PatientDataEntity 和其他 3 个表之间具有一对一的关系，这是通过删除 [ 来完成的ForeingKey] 来自 PatientDataEntity 属性的注释，但将它们保留在其他 3 个实体上(在指向 PatientDataEntity 的导航属性上)。 就这样。 以防其他人遇到同样的问题。

感谢大家

胡安·卡洛斯·加尔维斯