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我将 Code first EF 6.1 与 DotConnect 一起用于 Oracle 数据提供程序和 TPH。我创建了一个有 2 个子类的类。我正在尝试将记录添加到现有的数据库表中。但是当我尝试保存更改时它会引发 DbUpdateException。

异常：{“ORA-06550：第 4 行，第 298 列：\nPL/SQL：ORA-00904：\“鉴别器\”：无效标识符\nORA-06550：第 4 行，第 1 列：\nPL/SQL：忽略 SQL 语句"}

这是我的代码：

Person.cs :-----------------

public class Person
{
  public Person()
  {
   Departments= new HashSet<Department>();
  }

  [Key]
  public decimal PersonId { get; set; }

  public decimal OfficeId { get; set; }    

  public decimal PersonTypeId { get; set; }


  public virtual Office Office{ get; set; }

  public virtual ICollection<Department> Departments{ get; set; }

  protected bool success = false;

  public virtual bool FindDepartment(int personType)
  {
    return success;
  }

  public class PersonHR: Person
  {
    public override bool FindDepartment(int personType)
    {
      PersonEntityModel dbcontext = new PersonEntityModel ();

      Person p = new Person ();
      p.OfficeId= 765;
      p.PersonTypeId = personType;

     try
     {
       dbcontext.Persons.Add(p);
       dbcontext.SaveChanges();

       decimal personId= p.PersonId;                
     }
     catch (DbEntityValidationException dbEx)
     {          
     }

     return success;//this is just a test method so don't worry about return.
   }
  }

  public class PersonIT : Person
  {
    public override bool FindDepartment(int personType)
    {
      return success;
    }
  }
}

PersonEntityModel.cs --------------------

public partial class PersonEntityModel: DbContext
{
  public PersonEntityModel()
   : base("name=PersonEntityModel")
  {
  }

  public virtual DbSet<Office> Offices{ get; set; }
  public virtual DbSet<Person> Persons{ get; set; }
  public virtual DbSet<Department> Departments{ get; set; }

  protected override void OnModelCreating(DbModelBuilder modelBuilder)
  {
    modelBuilder.Configurations.Add(new PersonMap());     
  }        
}  

public class PersonMap: EntityTypeConfiguration<Person>
{
  public PersonMap()
  {
    this.Property(p =>   p.PersonId).HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity);
    this.HasMany(p => p.Departments).WithRequired(d=> d.Person).HasForeignKey(d=> d.PersonId);

    //table & column mappings
    this.ToTable("TABLEPERSON");
    this.Property(p => p.PersonId).HasColumnName("PERSONID");
    this.Property(p => p.OfficeId).HasColumnName("OFFICEID");
    this.Property(p => p.PersonTypeId).HasColumnName("PERSONTYPEID");      

   //this.Map<DomainObjectModel.ObjectModel.Person.PersonHR>(m => m.Requires("TYPE").HasValue(11));
   //this.Map<DomainObjectModel.ObjectModel.Person.PersonIT>(m => m.Requires("TYPE").HasValue(22));     

  }
}

如果没有最后 2 行，则会引发异常：{"ORA-06550: line 4, column 298:\nPL/SQL: ORA-00904: \"Discriminator\": invalid identifier\nORA-06550: line 4, column 1: \nPL/SQL: SQL 语句被忽略"}

对于最后 2 行，它会引发此异常： {"ORA-06550: line 4, column 298:\nPL/SQL: ORA-00904: \"TYPE\": invalid identifier\nORA-06550: line 4, column 1: \nPL/SQL: SQL 语句被忽略"}

我是 TPH 的新手。如何解决以上问题？

另外，请给我发一些关于 TPH 的好文章。我已阅读此http://weblogs.asp.net/manavi/inheritance-mapping-strategies-with-entity-framework-code-first-ctp5-part-1-table-per-hierarchy-tph。

感谢你的帮助，

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