使用 Fluent API 配置/映射属性和类型2

1.将多个实体类映射到数据库中的一个表

要将多个实体映射到一个数据库表需要满足：

a. 两个实体必须是一对一关系

b.两个实体共享一个主键

  public  class MyContext:DbContext
     {
         public MyContext()
             : base("test")
         { }
         protected override void OnModelCreating(DbModelBuilder modelBuilder)
         {
             modelBuilder.Entity<Person>()
                 .HasRequired(p => p.Detail)
                 .WithRequiredPrincipal();
         }
         public DbSet<Person> Persons { get; set; }
         public DbSet<PersonDetail> PersonDetails { get; set; }

     }

     [Table("Person")]
     public class Person
     {
         public int Id { get; set; }
         public string Name { get; set; }
         public bool Sex { get; set; }
         public PersonDetail Detail { get; set; }
     }
     [Table("Person")]
     public class PersonDetail
     {
         [Key,ForeignKey("Person")]
         public int Id { get; set; }
         public DateTime Birth { get; set; }
         public byte[] Photo { get; set; }
         public Person Person { get; set; }
     }
 }

2.将实体类型的 CLR 属性映射到数据库中的多个表

  public  class MyContext:DbContext
     {
         public MyContext()
             : base("test")
         { }
         protected override void OnModelCreating(DbModelBuilder modelBuilder)
         {
             modelBuilder.Entity<Person>()
                 .Map(p =>
                 {
                     p.Properties(t => new { t.Id, t.Name, t.Sex });
                     p.ToTable("Person");
                 })
                 .Map(p =>
                 {
                     p.Properties(t => new { t.Birth, t.Photo });
                     p.ToTable("PersonDetails2");
                 }
                 );
         }
         public DbSet<Person> Persons { get; set; }
     }

     [Table("Person")]
     public class Person
     {
         public int Id { get; set; }
         public string Name { get; set; }
         public bool Sex { get; set; }
         public DateTime Birth { get; set; }
         public byte[] Photo { get; set; }
     }