Question

是否可以映射以下场景？

数据表

学生

+ ID：int PK
+名称：varchar（200）

类

+ ID：int PK
+学生ID：FK
+ CourseID：FK
+ EnrollmentDate：DateTime

课程

+ ID：int PK
+名称：varchar（200）

我想将表格映射到下面的实体。



public class Student
{
    [Key]
    public int ID {get;set;}
    public string Name {get;set;}
    public virtual ICollection<Class> Classes {get;set;}
}

public class Student { [Key] public int ID {get;set;} public string Name {get;set;} public virtual ICollection<Class> Classes {get;set;} }

public class Class
{
[Key]
public int ID {get;set;}
public Student Student {get;set;}
public DateTime EnrollmentDate {get;set;}
public string Name {get;set;} // this comes from the Courses data table
}

Answer 1

这应该是如何建立您需要的FK关系：

public class Student
{
   [Key]
   public int StudentId {get;set;}
   public string Name {get;set;}
}

public class Class
{
   [Key]
   public int ClassId {get;set;}
   public DateTime EnrollmentDate {get;set;}

   //foreign keys
   public int CourseId {get;set;}
   public string StudentId {get;set;} 

   //virtual constraint to link to referenced tables
   public virtual Course Course {get;set;}
   public virtual Student Student {get;set;}
}

public class Course
{
   [Key]
   public int CourseId {get;set;}
   public string CourseName {get;set;}
}

实体框架代码优先：实体拆分

1 个答案: