/// <summary>
 /// 删除一个”学生“
 /// </summary>
 /// <param name="student_id">学生Id</param>
 /// <param name="id">执行人Id</param>
 /// <returns></returns>
 public bool SoftDeleteByStudentId(int student_id, int id)
 {
     return(idal_student.SoftDeleteByStudentId(student_id, id) > 0);
 }