Fluent API

https://www.e-learn.cn/content/net/921278

 

 

• Set the primary key
  modelBuilder.Entity <x> () HasKey ( t => t.Name).;
• Provided the primary key
  modelBuilder.Entity <x> () HasKey ( t => new {t.Name, t.ID}).;
• Identifying a database field cancellation (cancel the automatic increase)
  modelBuilder.Entity <X> () Property (T => t.Id) .HasDatabaseGeneratedOption (DatabaseGeneratedOption.None).;
• Setting identification database field (automatic growth)
  modelBuilder.Entity <Teacher> () Property (T => t.Id) .HasDatabaseGeneratedOption (DatabaseGeneratedOption.Identity).;
• The maximum length setting field
  modelBuilder.Entity <ClassA> () Property ( t => t.Name) .HasMaxLength (100).;
• Setting field is required
  . ModelBuilder.Entity <ClassA> () Property (t => t.Id) .IsRequired ();
• Attribute is not mapped to the database
  modelBuilder.Entity <ClassA> () Ignore ( t => tA).;
• Property specifies the name of the database column:
  modelBuilder.Entity <of ClassA> () .Property (T => tA of) .HasColumnName ( "A_A");
• Cascading deletes (default database is not cascading deletes)
  modelBuilder.Entity <Course,> (). HasRequired (T => t.Department) .WithMany (T => t.Courses) .HasForeignKey (D => d.DepartmentID ) .WillCascadeOnDelete ();
• 设置为Timestamp
  modelBuilder.Entity<OfficeAssignment>() .Property(t => t.Timestamp) .IsRowVersion();
• Table 1 0..1 (Instructor entity may contain zero or one OfficeAssignment)
  modelBuilder.Entity <OfficeAssignment> () HasRequired (T => t.Instructor) .WithOptional (T => t.OfficeAssignment).;
• 表1对1
  modelBuilder.Entity<Instructor>().HasRequired(t => t.OfficeAssignment).WithRequiredPrincipal(t => t.Instructor);
• Table 1 n (Department primary table)
  modelBuilder.Entity <Staff> () .HasRequired (C => c.Department) .WithMany (T => t.Staffs)
• Specifies the name of the foreign key (Staff fields in the specified table to the foreign key DepartmentID)
  modelBuilder.Entity <Staff> () .HasRequired (C => c.Department) .WithMany (T => t.Staffs) .map (m => m.MapKey ( "DepartmentID"));
• 表n对n
  modelBuilder.Entity<Course>()
  .HasMany(t => t.Instructors)
  .WithMany(t => t.Courses)
• 表n对n指定连接表名及列名
  modelBuilder.Entity<Course>()
  .HasMany(t => t.Instructors)
  .WithMany(t => t.Courses)
  .Map(m =>
  {
  m.ToTable("CourseInstructor");
  m.MapLeftKey("CourseID");
  m.MapRightKey("InstructorID");
  });