数据库计算- MVC 3和CodeFirst
本文关键字:CodeFirst MVC 计算 数据库 | 更新日期: 2023-09-27 18:11:03
我正在尝试编写一个生成多个佣金单的方法。这是针对一所大学的,客户在导师的指导下注册参加一个名为"入学"的课程。通过这种方法,我试图将导师的客户每月的费用乘以他们的佣金百分比,因为导师可以从他们提供的课程中获得一定的佣金。下面是我的代码:
public ActionResult CreateBulkCommissions()
{
var month = DateTime.Now.ToString("MMMM");
var enrolments = db.Enrollments.ToList();
var newCommissions = from enrolment in enrolments
select new TutorCommission()
{
CommissionAmount = enrolment.MonthlyFee,
CommissionMonth = month, // string constant
CommissionStatus = "Unpaid",
Tutor = enrolment.Tutor
};
foreach (var newCommission in newCommissions)
{
List<TutorCommission> TutorComs = newCommissions.GroupBy(g => g.Tutor).Select(s => new TutorCommission
{
CommissionAmount = s.Sum(u => u.CommissionAmount) * s.Key.TutorCommissionPercentage,
TutorNoID = s.Key.TutorNoID
}).ToList();
db.TutorCommission.Add(newCommission);
db.SaveChanges();
}
return RedirectToAction("Index");
}
问题是TutorCommission条目是为每个单独的注册创建的,而不是为每个导师(每月)创建一个带有总佣金金额的条目。例如,Ashley有3个客户,因此有3个注册,目前正在为他创建3个TutorCommission条目。我想把报名人数加起来。此外,该金额没有乘以佣金百分比,因此只是作为全额注册月费节省下来。相关类为:
public class Enrollment
{
[Key]
[Display(Name = "Enrollment ID Number")]
public long EnrollmentIDNumber { get; set; }
[Display(Name = "Client ID Number")]
public long ClientNumberID { get; set; }
[Display(Name = "Tutor ID Number")]
public long TutorNoID { get; set; }
[Display(Name = "Course Name")]
public string CourseName { get; set; }
[Display(Name = "Lesson Time")]
public string LessonTime { get; set; }
[Display(Name = "Lesson Day")]
public string LessonDay { get; set; }
[Display(Name = "Lesson Location")]
public string LessonLocation { get; set; }
[Display(Name = "Lesson Type")]
public string LessonType { get; set; }
[Display(Name = "Lesson Level")]
public string LessonLevel { get; set; }
[Display(Name = "Monthly Fee")]
public long MonthlyFee { get; set; }
public virtual Client Client { get; set; }
public virtual Tutor Tutor { get; set; }
}
public class TutorCommission
{
[Key]
[Display(Name = "Commission ID")]
public long CommissionID { get; set; }
[Display(Name = "Commission Month")]
public string CommissionMonth {get; set;}
[Display(Name = "Commission Amount")]
public double CommissionAmount { get; set; }
[Display(Name = "Commission Status")]
public string CommissionStatus { get; set; }
[Display(Name = "Tutor ID Number")]
public long TutorNoID { get; set; }
public virtual Tutor Tutor { get; set; }
public virtual ICollection<CommissionPayments> CommissionPayments { get; set; }
}
public class Tutor
{
[Key]
[Display(Name = "Tutor ID Number")]
public long TutorNoID { get; set; }
[Required]
[StringLength(50, ErrorMessage="First name must be less than 50 characters")]
[Display(Name = "First Name")]
public string TutorFirstName { get; set; }
[StringLength(50, ErrorMessage = "Last name must be less than 50 characters")]
[Display(Name = "Last Name")]
public string TutorLastName { get; set; }
[DisplayFormat(DataFormatString = "{0:d}", ApplyFormatInEditMode = true)]
[Display(Name = "Birth Date")]
public DateTime? TutorBirthDate { get; set; }
[Display(Name = "Cellphone Number")]
public string TutorCellphoneNumber { get; set; }
[Display(Name = "Home Number")]
public string TutorHomeNumber { get; set; }
[RegularExpression("^[a-z0-9_''+-]+(''.[a-z0-9_''+-]+)*@[a-z0-9-]+(''.[a-z0-9-]+)*''.([a-z]{2,4})$", ErrorMessage = "Not a valid email address")]
[Display(Name = "Email Address")]
public string TutorEmailAddress { get; set; }
[Display(Name = "Street Address")]
public string TutorStreetAddress { get; set; }
[Display(Name = "Suburb")]
public string TutorSuburb { get; set; }
[Display(Name = "City")]
public string TutorCity { get; set; }
[Display(Name = "Postal Code")]
public string TutorPostalCode { get; set; }
[Display(Name="Full Name")]
public string FullName
{
get
{
return TutorFirstName + " " + TutorLastName;
}
}
[Display(Name="Commission Percentage")]
[Required]
public double TutorCommissionPercentage { get; set; }
public virtual ICollection<Enrollment> Enrollments { get; set; }
public virtual ICollection<TutorCommission> TutorCommissions { get; set; }
}
谢谢,艾米
您可以尝试将分组逻辑移到foreach循环之外,然后在分组列表上迭代。所以不用
foreach (var newCommission in newCommissions)
{
List<TutorCommission> TutorComs = newCommissions.GroupBy(g => g.Tutor).Select(s => new TutorCommission
{
CommissionAmount = s.Sum(u => u.CommissionAmount) * s.Key.TutorCommissionPercentage,
TutorNoID = s.Key.TutorNoID
}).ToList();
db.TutorCommission.Add(newCommission);
db.SaveChanges();
}
试
List<TutorCommission> TutorComs = newCommissions.GroupBy(g => g.Tutor).Select(s => new TutorCommission
{
CommissionAmount = s.Sum(u => u.CommissionAmount) * s.Key.TutorCommissionPercentage,
TutorNoID = s.Key.TutorNoID
}).ToList();
foreach (var tutorCom in TutorComs)
{
db.TutorCommission.Add(tutorCom);
db.SaveChanges();
}