使用Fluent API配置/映射实体属性和类型（第二部分）

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

 1  public  class MyContext:DbContext
 2     {
 3         public MyContext()
 4             : base("test")
 5         { }
 6         protected override void OnModelCreating(DbModelBuilder modelBuilder)
 7         {
 8             modelBuilder.Entity<Person>()
 9                 .HasRequired(p => p.Detail)
10                 .WithRequiredPrincipal();
11         }
12         public DbSet<Person> Persons { get; set; }
13         public DbSet<PersonDetail> PersonDetails { get; set; }
14 
15     }
16 
17     [Table("Person")]
18     public class Person
19     {
20         public int Id { get; set; }
21         public string Name { get; set; }
22         public bool Sex { get; set; }
23         public PersonDetail Detail { get; set; }
24     }
25     [Table("Person")]
26     public class PersonDetail
27     {
28         [Key,ForeignKey("Person")]
29         public int Id { get; set; }
30         public DateTime Birth { get; set; }
31         public byte[] Photo { get; set; }
32         public Person Person { get; set; }
33     }
34 }View Code

2.将实体类型的 CLR 属性映射到数据库中的多个表

 1  public  class MyContext:DbContext
 2     {
 3         public MyContext()
 4             : base("test")
 5         { }
 6         protected override void OnModelCreating(DbModelBuilder modelBuilder)
 7         {
 8             modelBuilder.Entity<Person>()
 9                 .Map(p =>
10                 {
11                     p.Properties(t => new { t.Id, t.Name, t.Sex });
12                     p.ToTable("Person");
13                 })
14                 .Map(p =>
15                 {
16                     p.Properties(t => new { t.Birth, t.Photo });
17                     p.ToTable("PersonDetails2");
18                 }
19                 );
20         }
21         public DbSet<Person> Persons { get; set; } 
22     }
23 
24     [Table("Person")]
25     public class Person
26     {
27         public int Id { get; set; }
28         public string Name { get; set; }
29         public bool Sex { get; set; }  
30         public DateTime Birth { get; set; }
31         public byte[] Photo { get; set; }
32     }View Code

转载于:https://www.cnblogs.com/goodlucklzq/p/4612060.html

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