Can someone please help me with this problem? I am new to EF and i don't know what happen to this code:
Please find below query in the Controller:
foreach (var i in tt)
{
db.tbl_transaction.Add(i);
db.tbl_transactionlist.Add(tm.tlist);
var tools = (from j in db.tbl_tools_and_equips where j.itemno == i.controlno select j).First();
//tools.location = i.destinationid;
//tools.linemodel = i.line_model;
//tools.usage = i.process_assign;
tools.status = i.status;
tools.date_maintain = i.date_maintain;
tools.date_next_maintain = i.date_next_maintain;
}
try
{
/*return error: invalid columns in db.SaveChanges*/
db.SaveChanges();
For my Model:
public partial class tbl_transaction
{
public int transferevent { get; set; }
public string transactionno { get; set; }
public Nullable<int> itemno { get; set; }
public string assetdesc { get; set; }
public string serialno { get; set; }
public string barcode { get; set; }
public string sourcelocationid { get; set; }
public string destinationid { get; set; }
public Nullable<System.DateTime> transactiondate { get; set; }
public Nullable<int> quantity { get; set; }
public string unitmeasure { get; set; }
public string remarks { get; set; }
public string #ref { get; set; }
public string actg_rem { get; set; }
public string label { get; set; }
public string station { get; set; }
public string line_model { get; set; }
public string process_assign { get; set; }
public string status { get; set; }
public string controlno { get; set; }
public string category { get; set; }
public Nullable<System.DateTime> date_maintain { get; set; }
public Nullable<System.DateTime> date_repair { get; set; }
public string defect { get; set; }
public string repair_made { get; set; }
public Nullable<System.DateTime> date_next_maintain { get; set; }
}
Every time I execute the query, it always return invalid column name. Your help is very much appreciated.
Related
I have a three classes District, PostalCode and Premise. District contains a virtual list of postalcodes and the postal code class contains a virtual list of premises, from within the district controller is there any was of calculating the number of premises which are in the district, classes as follows:
public class District
{
[Key]
public int DistrictID { get; set; }
public string Name { get; set; }
public int Households { get; set; }
public int Population { get; set; }
public virtual List<PostalCode> PostalCodes { get; set; }
}
public class PostalCode
{
[Key]
public int PostalCodeID { get; set; }
public string FullPostcode { get; set; }
public bool InUse { get; set; }
public decimal Latitude { get; set; }
public decimal Longitude { get; set; }
public int Easting { get; set; }
public int Northing { get; set; }
public string GridReference { get; set; }
public string Ward { get; set; }
public string Parish { get; set; }
[Display(Name = "Introduced")]
[DataType(DataType.Date)]
[DisplayFormat(DataFormatString = "{0:yyyy-MM-dd}", ApplyFormatInEditMode = true)]
public DateTime Introduced { get; set; }
[Display(Name = "Terminated")]
[DataType(DataType.Date)]
[DisplayFormat(DataFormatString = "{0:yyyy-MM-dd}", ApplyFormatInEditMode = true)]
public DateTime? Terminated { get; set; }
public int Altitude { get; set; }
public string Country { get; set; }
[Display(Name = "Last Updated")]
[DataType(DataType.Date)]
[DisplayFormat(DataFormatString = "{0:yyyy-MM-dd}", ApplyFormatInEditMode = true)]
public DateTime? LastUpdated { get; set; }
public string Quality { get; set; }
public string LSOACode { get; set; }
public bool Processed { get; set; }
[Display(Name = "Last Visited")]
[DataType(DataType.Date)]
[DisplayFormat(DataFormatString = "{0:yyyy-MM-dd}", ApplyFormatInEditMode = true)]
public DateTime? LastVisited { get; set; }
public string SalesRep { get; set; }
public virtual List<Premise> Premises { get; set; }
public int? DistrictID { get; set; }
public virtual District District { get; set; }
}
public class Premise
{
[Key]
public int PremiseID { get; set; }
public string MPRN { get; set; }
public string MeterPointAddress { get; set; }
public string DUoSGroup { get; set; }
public string MeterConfigurationCode { get; set; }
public string MeterPointStatus { get; set; }
public int PostalCodeID { get; set; }
public virtual PostalCode PostalCode { get; set; }
public bool Live { get; set; }
public bool Pending { get; set; }
}
I am able to access the list of postal codes within the view of the district controller by using the following code:
#item.PostalCodes.Count()
I thought that I may have been able to use #item.PostalCodes.All().Premises.Count() or some variation of that but this is not being allowed by the compiler, is there any way that this can be accessing the third level premises class from within the district controller?
You can use Include and 2 foreach loops for this. Take a look at this article
public class Customer
{
public int CustomerID { get; set; }
public string Name { get; set; }
public virtual List<Invoice> Invoices { get; set; }
}
public class Invoice
{
public int InvoiceID { get; set; }
public DateTime Date { get; set; }
public int CustomerID { get; set; }
public virtual Customer Customer { get; set; }
public virtual ICollection<Item> Items { get; set; }
}
public class Item
{
public int ItemID { get; set; }
public string Name { get; set; }
public int InvoiceID { get; set; }
public virtual Invoice Invoice { get; set; }
}
And get data:
using (var context = new MyContext())
{
var list = context.Customers.ToList();
foreach (var customer in list)
{
Console.WriteLine("Customer Name: {0}", customer.Name);
foreach (var customerInvoice in customer.Invoices)
{
var items=customerInvoice.Items.Tolist();
}
}
}
Create a partial class District and add a couple field to this partial class:
public partial class District
{
[NotMapped]
public int PostaCodeCount
[NotMapped]
public int PremissesCount
}
Try this query inside of your controller:
var rowDistricts=db.Districts
.Include(pc=>pc.PostalCodes)
.ThenInclude(pr => pr.Premisses)
.ToList();
var districts= new List<District>();
foreach (var item in rowDistricts)
{
item.PostalCodeCount=item.PostalCodes.Count();
item.PremissesCount=item.Premisses.Count();
item.Premisses=null;
item.PostalCodes=null;
districts.Add(item);
}
return View(districts);
I have the following one-to-many database structure generated by code first. Many Buttons can be added with a relation back to a single GSMUnit. BtnNo should be unique (for every GSMUnitId), and shouldn't be duplicated. Currently it is possible to duplicate. how can i prevent this?
public class GSMUnit
{
public int Id { get; set; }
[MaxLength(20)]
public string Model { get; set; }
[MaxLength(40)]
public string GsmName { get; set; }
[MaxLength(40)]
public string TelephoneNum { get; set; }
public int GSMSiteId { get; set; }
public virtual GSMSite GSMSite { get; set; }
public virtual GSMSetting GSMSettings { get; set; }
public virtual ICollection<Button> Buttons { get; set; }
}
public class Button
{
public int Id { get; set; }
[MaxLength(30)]
public string Primary { get; set; }
[MaxLength(30)]
public string Divert1 { get; set; }
[MaxLength(30)]
public string Divert2 { get; set; }
[MaxLength(30)]
public string Divert3 { get; set; }
[MaxLength(20)]
public string AptNo { get; set; }
[MaxLength(10)]
public string Code { get; set; }
[MaxLength(4)]
public string DTO { get; set; }
[MaxLength(4)]
public string Timeband { get; set; }
[MaxLength(15)]
public string BtnNo { get; set; }
[MaxLength(20)]
public string AptName { get; set; }
public int GSMUnitId { get; set; }
public virtual GSMUnit GSMUnit { get; set; }
}
You can use the Index attribute for that:
public class Button
{
public int Id { get; set; }
[MaxLength(30)]
public string Primary { get; set; }
[MaxLength(30)]
public string Divert1 { get; set; }
[MaxLength(30)]
public string Divert2 { get; set; }
[MaxLength(30)]
public string Divert3 { get; set; }
[MaxLength(20)]
public string AptNo { get; set; }
[MaxLength(10)]
public string Code { get; set; }
[MaxLength(4)]
public string DTO { get; set; }
[MaxLength(4)]
public string Timeband { get; set; }
[MaxLength(15)]
public string BtnNo { get; set; }
[MaxLength(20)]
public string AptName { get; set; }
[Index(IsUnique = true)]
public int GSMUnitId { get; set; }
public virtual GSMUnit GSMUnit { get; set; }
}
But I recommend you to take a look on Fluent API. It's easier to configure in my opinion.
here is the simple query code...
var order = await _context.ProductOrders
.FirstOrDefaultAsync(x => x.Id == orderId.ToInt());
This is the entity of ProdictOrders
public class ProductOrder
{
public int Id { get; set; }
public int MovieTicketEnrollmentId { get; set; }
public string ProductOrderStatusCode { get; set; }
public int? InvoiceId { get; set; }
public DateTime CreateDate { get; set; }
public string CreateBy { get; set; }
public DateTime? UpdateDate { get; set; }
public string UpdateBy { get; set; }
/**
* Navigation Property
*/
public MovieTicketEnrollment MovieTicketEnrollment { get; set; }
public ProductOrderStatus ProductOrderStatus { get; set; }
public ICollection<ProductOrderItem> ProductOrderItems { get; set; }
public Invoice Invoice { get; set; }
}
This data in the database
And what I got after executing query command above... what's just happening here?
MovieTicketEnrollmentId should equal to 1
I am using Entity Framework. I have tried everything, searching and adding keys but Ienter image description here cannot understand what the problem is and how to resolve it.
public class Reservation
{
[Key]
public int BookingID { get; set; }
public int CustomerID { get; set; }
public int RoomID { get; set; }
public string BookingDate { get; set; }
public int Check_In { get; set; }
public int Check_Out { get; set; }
public int Adults { get; set; }
public int Children { get; set; }
public int NoOfNights { get; set; }
[ForeignKey("RoomID")]
public virtual Room Rooms { get; set; }
[ForeignKey("CustomerID")]
public virtual CustomerDetails CustomerDetail { get; set; }
public virtual ICollection<Payment> Payment { get; set; }
}
public class CustomerDetails
{
[Key]
public int CustomerID { get; set; }
public string FirstName { get; set; }
public string LastName { get; set; }
public int PostCode { get; set; }
public string State { get; set; }
public int PhoneNumber { get; set; }
public string Email { get; set; }
public string Password { get; set; }
public virtual ICollection<Reservation> Reservations { get; set; }
}
enter image description here
All tables need a primary key or you can't use Entity Framework.
I have 2 classes, course and student, and I want to get student courses with student id
help me please
I'm using entity framework code first
public class Course {
public int CourseID { get; set; }
public string Title { get; set; }
public string Details { get; set; }
public string img { get; set; }
public DateTime DateAdded { get; set; }
public Guid UserAddID { get; set; }
public Guid userEditID { get; set; }
public int SubCategoryID { get; set; }
public string Code { get; set; }
public string Summury { get; set; }
public decimal Price { get; set; }
public bool IsGift { get; set; }
public DateTime DateUpdated { get; set; }
public bool DelFlag { get; set; }
public DateTime? DelDate { get; set; }
public Guid? UserDelID { get; set; }
public ICollection<Student> Students { get; set; }
}
public class Student {
[Key]
public int StudentID { get; set; }
public string Name { get; set; }
public DateTime? DateBirth { get; set; }
public int? Age { get; set; }
public int? Sex { get; set; }
public string Email { get; set; }
public string Phone { get; set; }
public string Mobile { get; set; }
public string Mobile2 { get; set; }
public string UniversityID { get; set; }
public string CollegeID { get; set; }
public string IdentityID { get; set; }
public string Address { get; set; }
public string Education { get; set; }
public decimal? Payments { get; set; }
public string HowToKnow { get; set; }
public DateTime? GradeDate { get; set; }
public string LaterCourses { get; set; }
public string Job { get; set; }
public string Specialist { get; set; }
public string Notes { get; set; }
public int StatueID { get; set; }
public Guid? UserID { get; set; }
public DateTime? DateAdded { get; set; }
public Guid UserAddID { get; set; }
public Guid userEditID { get; set; }
public DateTime DateUpdated { get; set; }
public bool DelFlag { get; set; }
public DateTime? DelDate { get; set; }
public Guid? UserDelID { get; set; }
public virtual IList<Course> Courses { get; set; }
}
I want to get all courses for a given StudentID using a lambda expression.
var students = repository.Query<Course>(c => c.Student.Any(st=>st.StudentID == StudentID)