Question

我正在使用Code first EF 6.1和DotConnect for oracle data provider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数据库表中。但是当我尝试保存更改时，它会抛出DbUpdateException。

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

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));     

  }
}

没有最后2行，它会引发异常：{“ORA-06550：第4行，第298行：\ nPL / SQL：ORA-00904：\”Discriminator \“：无效标识符\ nORA-06550：第4行，第1列：\ nPL / SQL：SQL语句忽略“}

使用最后2行，它会引发此异常：{“ORA-06550：第4行，第298行：\ nPL / SQL：ORA-00904：\”TYPE \“：无效标识符\ nORA-06550：第4行，第1列：\ nPL / SQL：SQL语句忽略“}

我是TPH的新手。如何解决上述问题？

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。

感谢您的帮助，

TPH Simple Config / Discriminator问题与子类

0 个答案: