I have a data model which has three layers as follows:
Market Message
MessageType598
Metered Generation Information
The classes are as follows:
[Table("MarketMessage")]
public partial class MarketMessage
{
public MarketMessage()
{
messageType300 = new HashSet<messageType300>();
messageType300S = new HashSet<messageType300S>();
messageType300W = new HashSet<messageType300W>();
messageType305 = new HashSet<messageType305>();
messageType310 = new HashSet<messageType310>();
messageType310W = new HashSet<messageType310W>();
messageType320 = new HashSet<messageType320>();
messageType320W = new HashSet<messageType320W>();
messageType332 = new HashSet<messageType332>();
messageType332W = new HashSet<messageType332W>();
messageType591 = new HashSet<messageType591>();
messageType594 = new HashSet<messageType594>();
messageType595 = new HashSet<messageType595>();
messageType596 = new HashSet<messageType596>();
messageType597 = new HashSet<messageType597>();
messageType598 = new HashSet<messageType598>();
}
public int MarketMessageID { get; set; }
public DateTime CreatedOn { get; set; }
[Required]
[StringLength(4)]
public string messageType { get; set; }
[Required]
[StringLength(8)]
public string VersionNumber { get; set; }
public DateTime MarketTimestamp { get; set; }
[Required]
[StringLength(35)]
public string TxRefNbr { get; set; }
[Required]
[StringLength(3)]
public string Sender { get; set; }
[Required]
[StringLength(3)]
public string Recipient { get; set; }
[StringLength(10)]
public string alertFlag { get; set; }
[StringLength(50)]
public string fileName { get; set; }
public bool IsDeleted { get; set; }
public virtual ICollection<messageType300> messageType300 { get; set; }
public virtual ICollection<messageType300S> messageType300S { get; set; }
public virtual ICollection<messageType300W> messageType300W { get; set; }
public virtual ICollection<messageType305> messageType305 { get; set; }
public virtual ICollection<messageType310> messageType310 { get; set; }
public virtual ICollection<messageType310W> messageType310W { get; set; }
public virtual ICollection<messageType320> messageType320 { get; set; }
public virtual ICollection<messageType320W> messageType320W { get; set; }
public virtual ICollection<messageType332> messageType332 { get; set; }
public virtual ICollection<messageType332W> messageType332W { get; set; }
public virtual ICollection<messageType591> messageType591 { get; set; }
public virtual ICollection<messageType594> messageType594 { get; set; }
public virtual ICollection<messageType595> messageType595 { get; set; }
public virtual ICollection<messageType596> messageType596 { get; set; }
public virtual ICollection<messageType597> messageType597 { get; set; }
public virtual ICollection<messageType598> messageType598 { get; set; }
}
public partial class messageType598
{
public int messageType598ID { get; set; }
public int MarketMessageID { get; set; }
public DateTime SettlementDate { get; set; }
public int SettlementRunIndicator { get; set; }
[Required]
[StringLength(9)]
public string GenerationUnit { get; set; }
}
[Table("MeteredGenerationInformation")]
public partial class MeteredGenerationInformation
{
[Key]
public int MeteredGenerationInfoID { get; set; }
public DateTime IntervalPeriodTimestamp { get; set; }
public int SettlementInterval { get; set; }
public decimal GenerationUnitMeteredGeneration { get; set; }
public decimal LossAdjustedGenerationUnitMeteredGeneration { get; set; }
public int? MessageType594ID { get; set; }
public int? MessageType598ID { get; set; }
}
I am attempting to join a list of all market messages received of type 598 including the metered generation information but I am unsure how to do this via LINQ to SQL. I have attempted the following:
var list598s = db.MarketMessage.Where(mm => mm.messageType == "598")
.Include(mm => mm.messageType598)
.ToList();
This includes the market messages including the 598 information but how can I include the metered generation information also in this list, I would also ideally like to refine the list based on a date field found within the messageType598 level
As a SQL query I would write the following:
select * from MarketMessage as a
inner join messageType598 as b on a.MarketMessageID = b.MarketMessageID
inner join MeteredGenerationInformation as c on b.messageType598ID = c.messageType598ID
where c.IntervalPeriodTimestamp between '1 aug 2016' and '31 aug 2016'
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 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.
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.
Department class:
public partial class Department
{
public Department()
{
this.Courses = new HashSet<Course>();
}
public int DepartmentID { get; set; }
public string Name { get; set; }
public virtual ICollection<Course> Courses { get; set; }
}
Course class:
public partial class Course
{
public Course()
{
this.Enrollments = new HashSet<Enrollment>();
this.People = new HashSet<Person>();
}
public int CourseID { get; set; }
public string Title { get; set; }
public int DepartmentID { get; set; }
public virtual Department Department { get; set; }
}
Context:
lazy loading is enabled as below.
universityDBContext.Configuration.LazyLoadingEnabled = true;
universityDBContext.Configuration.ProxyCreationEnabled = true;
Lazy loading is not working in Entity Framework 5. Please help
public partial class Department
{
public Department()
{
this.Courses = new HashSet<Course>();
this.Students = new HashSet<Student>();
}
public int DepartmentID { get; set; }
public string Name { get; set; }
public decimal Budget { get; set; }
public System.DateTime StartDate { get; set; }
public Nullable<int> InstructorID { get; set; }
public byte[] RowVersion { get; set; }
public virtual ICollection<Course> Courses { get; set; }
public virtual ICollection<Student> Students { get; set; }
public virtual Person Person { get; set; }
}
public partial class Course
{
public Course()
{
this.Enrollments = new HashSet<Enrollment>();
this.People = new HashSet<Person>();
}
public int CourseID { get; set; }
public string Title { get; set; }
public int Credits { get; set; }
public int DepartmentID { get; set; }
public byte[] rowversion { get; set; }
[ForeignKey("Department")]
public virtual Department Department { get; set; }
public virtual ICollection<Enrollment> Enrollments { get; set; }
public virtual ICollection<Person> People { get; set; }
}
I have two models in my application: Stock and Report. A report can have many stocks and a stock can be used in many reports.
public enum ElectionType
{
MANAGER =1 ,
INSPECTOR ,
BOTH
}
public class Report
{
public Report()
{
Stocks = new List<Stock>();
}
public int ReportID { get; set; }
[Required]
public DateTime ShamsiDate { get; set; }
public int? StockID { get; set; }
[Required]
public ElectionType ElectionType { get; set; }
[ForeignKey("StockID")]
public virtual ICollection<Stock> Stocks { get; set;}
}
public class Stock
{
[Key]
[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public int StockID { get; set; }
public int FinancialCode { get; set; }
public String NationalCode { get; set; }
public String FirstName { get; set; }
public String LastName { get; set; }
public String FatherName { get; set; }
public String Place { get; set; }
public int StockCount { get; set; }
public int StockPrice { get; set; }
public int StockSize { get; set; }
public int StartStock { get; set; }
public int EndStock { get; set; }
}
I want to create a one way relationship so there is no way to access a Report from a Stock. I have written this code but it doesn't work.
To do it with annotations you will need a junction table:
public class ReportStock
{
[Key, Column(Order = 1)]
public int ReportID { get; set; }
[Key, Column(Order = 2)]
public int StockID { get; set; }
[ForeignKey("ReportID")]
public virtual Report Report { get; set;}
[ForeignKey("StockID")]
public virtual Stock Stock { get; set;}
}
Then change your Report class:
public class Report
{
public Report()
{
ReportStocks = new List<ReportStock>();
}
public int ReportID { get; set; }
[Required]
public DateTime ShamsiDate { get; set; }
[Required]
public ElectionType ElectionType { get; set; }
public virtual ICollection<ReportStock> ReportStocks { get; set;}
}