EF实体类的增删改查操作

//新增 //传统写法 Entities es = new Entities(); Sys_student stu = new Sys_student() { Name = "测试" }; es.Sys_student.Add(stu); es.SaveChanges(); //通过属性来实现 Sys_student stu = new Sys_student() { Name = "测试" }; DbEntityEntry<Sys_student> entry = es.Entry<Sys_student>(stu); entry.State = System.Data.Entity.EntityState.Added; es.SaveChanges();

//修改 Entities es = new Entities(); Sys_student stu = new Sys_student() { ID = 41, Name = "测试" }; DbEntityEntry<Sys_student> entry = es.Entry<Sys_student>(stu); entry.State = System.Data.Entity.EntityState.Unchanged; entry.Property("Name").IsModified = true; es.SaveChanges(); Console.WriteLine("修改数据成功!"); //删除 //传统写法 int id = 1001; Sys_student stu = es.Sys_students.Find(id); es.Sys_students.Remove(stu); es.SaveChanges(); //不查找数据,直接删除 Sys_student stu = new Sys_student{ID=1001}; es.Sys_students.Attach(stu); es.Sys_students.Remove(stu); es.SaveChanges();