EF6 代码优先，根据model类自动建表

EF代码优先

新建一个控制台应用程序，代码如下

控制台代码

private static void Main(string[] args)
        {
            //SchoolContext:EF6自动建表的类
            using (var ctx = new SchoolContext())
            {
                //Student表名
                var student = new Student() { StudentName = "Bill" };

                //给Student表添加数据
                ctx.Students.Add(student);

                //给Teachers添加数据
                ctx.Teachers.Add(new Teacher() { TeacherName="嫖老师",ModeOfTeaching= TeachingMode.ClassRoom });

                //保存操作
                ctx.SaveChanges();

                //EF6查询动作，FirstOrDefault:取序列中满足条件的第一个元素，如果没有元素满足条件，则返回默认值
                var dStu = ctx.Students.Where(x => x.StudentName == "Bill").FirstOrDefault();

                //删除Students表查出来StudentName = "Bill"的数据
                ctx.Students.Remove(dStu);

                ctx.SaveChanges();
                
            }
            Console.WriteLine("Demo completed.");
            Console.ReadLine();
        }

这个是后台代码

//继承DbContext实现EF6的相关操作
public class SchoolContext : DbContext
    {
        //构造函数，base里写连接数据库语句
        public SchoolContext() : base("Server=.;uid=sa;pwd=123456;database=EFTest;")
        {
            //数据库不存在时重新创建数据库，避免了新建完库后有再次重复该动作
            Database.SetInitializer<SchoolContext>(new CreateDatabaseIfNotExists<SchoolContext>());//

            //输出SQL日志
            Database.Log += PrintSql;
        }
        
        public void PrintSql(string sql)
        {
            Console.WriteLine(sql);
        }

        protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            //Adds configurations for Student from separate class

            //执行StudentConfigurations里的相关配置
            modelBuilder.Configurations.Add(new StudentConfigurations());

            //使Teacher这个model新建的表名为TeacherInfo
            modelBuilder.Entity<Teacher>()
                .ToTable("TeacherInfo");

            modelBuilder.Entity<Teacher>()
                .MapToStoredProcedures();
        }

        /// <summary>
        /// 实例化后可以操作下边表的增删改查
        /// </summary>
        public DbSet<Student> Students { get; set; }
        public DbSet<Grade> Grades { get; set; }
        public DbSet<Course> Courses { get; set; }
        public DbSet<Teacher> Teachers { get; set; }
        public DbSet<StudentAddress> StudentAddresses { get; set; }
    }

StudentConfigurations类的配置

public class StudentConfigurations : EntityTypeConfiguration<Student>
    {
        public StudentConfigurations()
        {
            this.Property(s => s.StudentName)
                .IsRequired()
                .HasMaxLength(50);

            this.Property(s => s.StudentName)
                .IsConcurrencyToken();

            // Configure a one-to-one relationship between Student & StudentAddress

            //StudentAddress类重写了被Student里的StudentAddress(Address)
            //WithRequired后者包含前者一个不为null的实例
            //https://www.cnblogs.com/suizhikuo/p/4742372.html
            this.HasOptional(s => s.Address) // Mark Student.Address property optional (nullable)
                .WithRequired(ad => ad.Student); // Mark StudentAddress.Student property as required (NotNull).
        }
    }

其中一个model-Student类

 public class Student
    {
        public int StudentID { get; set; }
        public string StudentName { get; set; }
        public DateTime? DateOfBirth { get; set; }//?代表可以为空
        public decimal Height { get; set; }
        public float Weight { get; set; }
        public byte[] RowVersion { get; set; }

        //fully defined relationship
        public int? GradeId { get; set; }

        public virtual Grade Grade { get; set; }

        public virtual StudentAddress Address { get; set; }
        public virtual ICollection<Course> Courses { get; set; }
    }

github源码下载

https://github.com/entityframeworktutorial/EF6-Code-First-Demo

EF增删改的操作

https://www.cnblogs.com/hao-1234-1234/archive/2018/04/09/8760985.html

EF 通过DataAnnotations配置属性和类型

https://www.cnblogs.com/GreenLeaves/p/7589350.html

EF 如何关闭自动检测_MigrationHistory

https://blog.csdn.net/weixin_30660027/article/details/97224729