I'm developing a web application with ASP.NET 4.0.
I have a database SQL Server 2005 and I'm using Entity Framework 5 connecting to it.
public class ArchivioClienti : DbContext
{
public ArchivioClienti()
: base("ICAMConnection")
{
}
public DbSet<ClientiProspect> clienti { get; set; }
}
[Table("pvw_clienti_prospect")]
public class ClientiProspect
{
[Key]
public string tipologia { get; set; }
public string cod_ppro { get; set; }
public string rag_soc { get; set; }
public string indirizzo { get; set; }
public string cap { get; set; }
public string citta { get; set; }
public string prov { get; set; }
public string nazione { get; set; }
public string telefono { get; set; }
public string fax { get; set; }
public string part_iva { get; set; }
public string cod_fisc { get; set; }
public string note { get; set; }
public string e_mail { get; set; }
public string cod_ppro_anag { get; set; }
public string cod_vage { get; set; }
public string cod_visp { get; set; }
public string fonte { get; set; }
public string cod_vzon { get; set; }
public decimal perc_provv { get; set; }
public string flag_stato { get; set; }
public string cod_anag { get; set; }
public string gg_chiusura { get; set; }
public DateTime? data_ins { get; set; }
public string cod_canale { get; set; }
}
I'm trying to get data from a table. This isn't a really table but only a view.
When I load a query with LINQ,
var result = from u in dbClienti.clienti
select u;
return result.ToList()
I receive the correct number of results (the same that i receive with the same query in SQL Server Management studio), but with wrong fields: the first one is replicated several times, the second one the same, etc.
Why is it working in this way? Are there any problems on Entity Frameworks with database's views?
I assume your view is correctly configured and returning the correct results when executed outside of Entity Framework?
There's no problem with using a view instead of a table in Entity Framework. I would run SQL Profiler and see what E.F is doing when executing the query.
Related
I have implemented asp .net application without Code first approach. now i want to build different system with existing database and code first.
public class EmployeeEntity
{
public int Id { get; set; }
public string ResourceCode { get; set; }
public string FirstName { get; set; }
public string LastName { get; set; }
public DateTime DateOfBirth { get; set; }
public int Gender { get; set; }
public int Status { get; set; }
public string NIC { get; set; }
}
now i want to add code first entities.
[Table("ExternalApplicantEntity")]
public class ExternalApplicantEntity
{
[Key]
[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public int ApplicantID { get; set; }
//[ForeignKey("EmployeeEntity")]
//public int Created_By { get; set; }
//public virtual EmployeeEntity EmployeeEntity { get; set; }
public string NIC { get; set; }
public string Mobile { get; set; }
public string Institute { get; set; }
how i combine these codes?
First off, I know there are a lot of posts about the Unable to determine the principal end of an association between the types error but ever single one I see does not match my issue, if I missed one sorry about that.
I have built an Entity that will end up referencing it's self twice and when I put the code in for the first self reference it works fine, as soon as ad the code for the second it breaks. Doing some testing I have found that if I use either of the self references by them self everything works fine, it is only when I add the second self reference that it breaks. The code I am using for the self references is:
[ForeignKey("ManagerID")]
public User Manager { get; set; }
//Auditing Fields
public DateTime DateCreated { get; set; }
public int? UpdatedByUserID { get; set; }
public DateTime? DateUpdated { get; set; }
public DateTime LastAutoUpdate { get; set; }
[ForeignKey("UpdatedByUserID")]
public User UpdatedByUser { get; set; }
The full entity code block is:
public class User
{
[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public int ID { get; set; }
public int ADPFileNumber { get; set; }
[Required]
public string ADUserName { get; set; }
public int AirCardCheckInLateCount { get; set; }
[Required]
public string Email { get; set; }
public DateTime? EndDate { get; set; }
[Required]
public string FirstName { get; set; }
[Required]
public string LastName { get; set; }
public int ManagerID { get; set; }
public string MobilePhone { get; set; }
[Required]
public string Office { get; set; }
[Required]
public string Phone { get; set; }
public decimal PTO { get; set; }
public DateTime StartDate { get; set; }
public int VehicleCheckInLateCount { get; set; }
public int WexCardDriverID { get; set; }
[ForeignKey("ManagerID")]
public User Manager { get; set; }
//Auditing Fields
public DateTime DateCreated { get; set; }
public int? UpdatedByUserID { get; set; }
public DateTime? DateUpdated { get; set; }
public DateTime LastAutoUpdate { get; set; }
[ForeignKey("UpdatedByUserID")]
public User UpdatedByUser { get; set; }
}
What am I missing that cause the second self reference to break?
You have to indicate the principal end of both associations explicitly. You can do that with the class you had originally, without inverse collection properties:
modelBuilder.Entity<User>()
.HasOptional(u => u.Manager)
.WithMany()
.HasForeignKey(u => u.ManagerID);
modelBuilder.Entity<User>()
.HasOptional(u => u.UpdatedByUser)
.WithMany()
.HasForeignKey(u => u.UpdatedByUserID);
Note that ManagerID should be an int? as well. You can't create any User if it requires another user to preexist. That's a chicken-and-egg problem.
As mentionned in Multiple self-referencing relationships in Entity Framework, you seem to be missing the other part of the relationship.
i.e.
[InverseProperty("Manager")]
public virtual ICollection<User> ManagedUsers {get;set;}
[InverseProperty("UpdatedByUser")]
public virtual ICollection<User> UpdatedUsers {get;set;}
EDIT: based on #Gert Arnold's answer you should indeed add the [InverseProperty] attribute
I have got my application up and running using Code first, I am trying to set a 1-1 relationship but when I update-database I get the error "SupplyPointId: Name: Each property name in a type must be unique. Property name 'SupplyPointId' is already defined."
I've tried removing the existing index constraint on SupplyPointAddress.SupplyPointId and that does not help. In the other table its the PK. Any comments really appreciated
public partial class SupplyPoint
{
[Key]
//[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public int SupplyPointId { get; set; }
public string SPID { get; set; }
public string SupplyPointName { get; set; }
public int SupplyPointTypeId { get; set; }
public DateTime SupplyPointEffectiveDateTime { get; set; }
public string GazateerRef { get; set; }
public virtual SupplyPointType SupplyPointType { get; set; }
//[ForeignKey("SupplyPointId")]
public virtual SupplyPointAddress SupplyPointAddress { get; set; }
}
public partial class SupplyPointAddress
{
[Key]
//[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public int SupplyPointAddressId { get; set; }
public int SupplyPointId { get; set; }
public string D5001_FreeDescriptor { get; set; }
public string D5002_SubBuildingName { get; set; }
public string D5003_BuildingName { get; set; }
public string D5004_BuildingNumber { get; set; }
public string D5005_DependentThoroughfareName { get; set; }
public string D5006_DependentThoroughfareDescriptor { get; set; }
public string D5007_ThoroughfareName { get; set; }
public string D5008_ThoroughfareDescriptor { get; set; }
public string D5009_DoubleDependentLocality { get; set; }
public string D5010_DependentLocality { get; set; }
public string D5011_PostTown { get; set; }
public string D5012_County { get; set; }
public string D5013_Postcode { get; set; }
public virtual SupplyPoint SupplyPoint { get; set; }
}
public System.Data.Entity.DbSet<AscendancyCF.Models.SupplyPoint> SupplyPoints { get; set; }
public System.Data.Entity.DbSet<AscendancyCF.Models.SupplyPointAddress> SupplyPointAddresses { get; set; }
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Entity<SupplyPointAddress>()
.HasOptional<SupplyPoint>(u => u.SupplyPoint)
.WithRequired(c => c.SupplyPointAddress).Map(p => p.MapKey("SupplyPointId"));
base.OnModelCreating(modelBuilder);
}
I moved the foreign key into SupplyPoint table so that the foreign key was being defined as SupplyPointAddressId in SupplyPoint. This worked and allows me to do SupplyPoint.SupplyPointAddress in resultant model
Since you're testing with a real DB. Use some of the
Database Initialization Strategies in Code-First:
public class SchoolDBContext: DbContext
{
public SchoolDBContext(): base("SchoolDBConnectionString")
{
Database.SetInitializer<SchoolDBContext>(new CreateDatabaseIfNotExists<SchoolDBContext>());
//Database.SetInitializer<SchoolDBContext>(new DropCreateDatabaseIfModelChanges<SchoolDBContext>());
//Database.SetInitializer<SchoolDBContext>(new DropCreateDatabaseAlways<SchoolDBContext>());
//Database.SetInitializer<SchoolDBContext>(new SchoolDBInitializer());
}
public DbSet<Student> Students { get; set; }
public DbSet<Standard> Standards { get; set; }
}
(Excerpt from this site)
It is pretty self explanatory.
If there's already a DB created, it just DROPs it.
Happy coding!
I'm new to mvc. I've creted an MVC app, in which i have used code first approach. Right now i have two tables Deal and Comment. Now i want to add a new table Category in the database and new column categoryId in Deal table.
How i can update database and model?
I'm using Sql Server 2008 R2 for Database.
I've following structure of class:
namespace FBWebApp.Models
{
public class Deal
{
public int ID { get; set; } // ID
public string Title { get; set; } // Titolo del deal
public string Description { get; set; } // Descrizione dell'annuncio
public string FacebookUID { get; set; } // UID facebook dell'utente
public string Visibility { get; set; } // Visibility
public string Category { get; set; }
public int Option1 { get; set; }
public int Option2 { get; set; }
public int Option3 { get; set; }
public int Option4 { get; set; }
public string PhotoURL { get; set; } // URL of the facebook photo profile
public string Name { get; set; } // Name of the user
public string ProfileUrl { get; set; } // URL of the facebook profile
public string Photo1 { get; set; } // URL of the Photo1 (local )
public string Photo2 { get; set; }
public string Photo3 { get; set; }
public string Photo4 { get; set; }
public string Photo5 { get; set; }
}
public class Comment
{
[Key]
public int CommentId { get; set; }
public string CommentText { get; set; }
public int ID { get; set; }
[ForeignKey("ID")]
public Deal DelNav { get; set; }
}
public class DealDBContext : DbContext
{
public DealDBContext() : base("DealDBContext") { }
public DbSet<Deal> Deals { get; set; }
public DbSet<Comment> Comments { get; set; }
}
}
Try using 'update-database -force -verbose' in the Package Manager Console.
If it doesn't work, modify the migration but typing 'add-migration somename' and it will apear in the Migrations folder.
If you are new to MVC and EF, definitely check out this tutorial. It explains all about that and everything else you need to know:
http://pluralsight.com/training/Player?author=scott-allen&name=mvc4-building-m1-intro&mode=live&clip=0&course=mvc4-building
first add your model :
public class Category
{
public int ID { get; set; }
public int cateName { get; set; }
}
in Deal class :
public class Deal
{
//..
[ForeignKey("CatId")]
public virtual Category Category { get; set; }
}
after Enable Migration you should use this command in console manager to update your database :
update-database
I've been reading through lots of articles trying to learn MVC4, but I'm stumped as to why my entity is not getting updated to database.
I've been trying to modify the MVC4 VS2012 Internet template.
So, here's the Controller action:
[HttpPost, ActionName("Approve")]
[Authorize]
public ActionResult ApproveConfirmed(long id)
{
using (StudentiContext context = new StudentiContext())
{
// context.Configuration.AutoDetectChangesEnabled = false;
var studente = (from d in context.STUDENTI_STRANIERI_MASTER_REG
where d.ID_PERSONA == id
select d).Single();
STUDENTI_STRANIERI_MASTER_REG st2 = studente;
st2.ESITO = 1;
//studente.ESITO = 1;
var statos = context.Entry(studente).State;
Console.WriteLine("Before DetectChanges: {0}",statos);
//context.ChangeTracker.DetectChanges();
context.Entry(studente).State = EntityState.Modified;
context.Entry(studente).CurrentValues.SetValues(st2);
// var tracked = context.ChangeTracker.Entries();
context.Entry(studente).Property( o => o.ESITO ).IsModified = true;
TryUpdateModel(studente);
context.SaveChanges();
Console.WriteLine("After DetectChanges: {0}",statos);
return RedirectToAction("PrivateIndex");
}
}
The aim is just to update one property, ESITO and set it to 1. Currently its value is 2.
This is the model:
namespace MvcStudenti2.Models
{
using System;
using System.Collections.Generic;
public partial class STUDENTI_STRANIERI_MASTER_REG
{
public long ID_PERSONA { get; set; }
public string COGNOME { get; set; }
public string NOME { get; set; }
public string SESSO { get; set; }
public System.DateTime DATA_NASCITA { get; set; }
public long ID_STATO_NASCITA { get; set; }
public string LUOGO_NASCITA_ESTERO { get; set; }
public string CODICE_FISCALE { get; set; }
public string TITOLO_POSSEDUTO { get; set; }
public Nullable<short> DURATA_TITOLO { get; set; }
public string VOTAZIONE { get; set; }
public string UNI_PROVENIENZA { get; set; }
public long ID_STATO_UNI { get; set; }
public string CERT_LINGUISTICA { get; set; }
public string CERT_PUNTEGGIO { get; set; }
public string NOTE { get; set; }
public System.DateTime DATA_RICHIESTA { get; set; }
public short ESITO { get; set; }
public string CDS_COD { get; set; }
public string EMAIL { get; set; }
public string NUMERO_TELEFONO { get; set; }
public string INDIRIZZO { get; set; }
public string CAP_INDIRIZZO { get; set; }
public string CITTA { get; set; }
public long ID_STATO_INDIRIZZO { get; set; }
public string DESCRIZIONE_CIT_NAZ { get; set; }
public Nullable<System.DateTime> DATA_COMPLETAMENTO_ATTESO { get; set; }
public Nullable<System.DateTime> ANNO_COMPLETAMENTO { get; set; }
public Nullable<short> DURATA_CORSO_COMPLETATO { get; set; }
public decimal GPA { get; set; }
public string ALTRI_TITOLI { get; set; }
public string MADRELINGUA { get; set; }
public Nullable<short> CERT_TOEFL_PUNT { get; set; }
public string CERT_FIRSTCERT_GRADE { get; set; }
public Nullable<short> CERT_FIRSTCERT_PUNT { get; set; }
public byte[] FILE_CV { get; set; }
public byte[] FILE_CARRIERA { get; set; }
public byte[] FILE_CERT_LINGUA { get; set; }
public byte[] FILE_DOC_IDENTITA { get; set; }
public string PWD { get; set; }
public string FILE_CV_NOME { get; set; }
public string FILE_CARRIERA_NOME { get; set; }
public string FILE_CERT_LINGUA_NOME { get; set; }
public string FILE_DOC_IDENTITA_NOME { get; set; }
public string FILE_CV_TIPO { get; set; }
public string FILE_CARRIERA_TIPO { get; set; }
public string FILE_CERT_LINGUA_TIPO { get; set; }
public string FILE_DOC_IDENTITA_TIPO { get; set; }
public Nullable<short> STATO { get; set; }
public Nullable<short> VALUTATO { get; set; }
public Nullable<short> ARCHIVIATO { get; set; }
public string CDS_COD_2 { get; set; }
public Nullable<short> MAIL_INVIATA { get; set; }
public string LINK_ULTIMO_CORSO { get; set; }
public Nullable<short> ATTIVO { get; set; }
public byte[] FILE_LETTERA_ACCETTAZIONE { get; set; }
public string FILE_LETTERA_ACCETTAZIONE_NOME { get; set; }
public string FILE_LETTERA_ACCETTAZIONE_TIPO { get; set; }
}
}
Everywhere I read I find that SaveChanges() should be enough, possibly after the EntityState.Modified.
I can correctly edit the entity, if I pass the whole entity to the Action, but in this case the Approve view is a built on a Detail template, so I don't have anything to POST from it (and I'd prefer not to: I could insert a hidden field and post just that, but I'm trying to update a single filed from code, and I'm not sure if the whole entity would get updated or overwritten ).
statos goes to "modified", if I understand correctly, because I have done a query on the entity.
Another thing I don't understand is why ESITO gets update -also- in studente, but then reverts to "2" after SaveChanges().
Are property changes being detected? I've wrapped every Action in a using block, as suggested elsewhere, so not to have multiple contextx/instances around.
Could anyone please point me to what I'm doing wrong? The code above is probably over-redundant, but I've been trying everything I have found on SO.
Thanks, everyone.
The following is all that is required to change the ESITO property.
[HttpPost, ActionName("Approve")]
[Authorize]
public ActionResult ApproveConfirmed(long id)
{
using (StudentiContext context = new StudentiContext())
{
// context.Configuration.AutoDetectChangesEnabled = false;
var studente = (from d in context.STUDENTI_STRANIERI_MASTER_REG
where d.ID_PERSONA == id
select d).Single();
studente.ESITO = 1;
context.SaveChanges();
return RedirectToAction("PrivateIndex");
}
}