I have problem with my query. I want to display the result on a view.
[HttpGet]
[ValidateAntiForgeryToken]
public async Task<IActionResult> Index()
{
return View(await _Context.Employee
.FromSql("EXEC sp_GetLoanDetails")
.ToArrayAsync());
}
Here is my list of items I want to view:
public class StoredProcRow
{
[Key]
public int empID { get; set; }
public string empFullName { get; set; }
public double EducationalLoan { get; set; }
public double PettyCash { get; set; }
public double BusinessLoan { get; set; }
public double ApplianceLoan { get; set; }
public double EmergencyLoan { get; set; }
public double AllPurposeLoan { get; set; }
public double KAPUSOIILoan { get; set; }
public double FiestaLoan { get; set; }
public double SalaryLoan { get; set; }
public double Pledge { get; set; }
public double PagIbigLoan { get; set; }
public double SSSLoan { get; set; }
public double AllAroundLoan { get; set; }
public double Total { get; set; }
}
Note: These entities name are the same as entities on column name in sp_GetLoanDetails
Is this achievable right now on EF Core 1.1? Or do I need to go back to manual ADO.NET code?
Thanks!
While support for stored procedures isn’t completely there with Entity Framework Core yet, you still can use FromSql to consume stored procedures with it.
In order to do that, the database context needs to know the entity you are mapping to from the stored procedure. Unfortunately, the only way to do that right now is to actually define it as an entity in the database context:
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
base.OnModelCreating(modelBuilder);
modelBuilder.Entity<StoredProcRow>(entity =>
{
// …
});
}
Then, you can consume the stored procedure by running the FromSql method on a set for that entity:
public virtual IQueryable<StoredProcRow> GetLoanDetails()
{
return Set<StoredProcRow>().FromSql("[sp_GetLoanDetails]").AsNoTracking();
}
Note that I’m using a AsNoTracking here to avoid the data context to track changes to entities that come from the stored procedure (since you don’t have a way to update them anyway). Also I’m using Set<T>() inside the method to avoid having to expose the type as a member on the database context since you cannot use the set without the stored procedure anyway.
Btw. you don’t need (not sure if that even works) EXEC in the sql statement you pass to FromSql. Just pass the stored procedure name and any arguments to it, e.g.:
Set<MyEntity>().FromSql("[SomeStoredProcedure]");
Set<MyEntity>().FromSql("[SProcWithOneArgument] #Arg = {0}");
Set<MyEntity>().FromSql("[SProcWithTwoArguments] #Arg1 = {0}, Arg2 = {1}");
From NuGet add System.Data.Common and System.Data.SqlClient. These allow ADO.NET commands to be run i.e. a stored procedure.
https://forums.asp.net/post/6061777.aspx
Related
I have the following controller which is supposed to create a new object in the database:
[HttpPost]
public ActionResult<Panels> CreateNewPanel(Panels panel)
{
_context.Panels.Add(panel);
_context.SaveChanges();
return CreatedAtAction(nameof(GetPanelById), new { id = panel.ID }, panel);
}
It is receiving some JSON data, example:
{
"desc": "test5",
"frame": 2,
"aC240v": false
}
Which maps to the following model:
public class Panels
{
public int ID { get; set; }
public string Desc { get; set; }
public PanelFrames Frame { get; set; }
public bool AC240v { get; set; }
}
It works for the most part if "frame" isn't set, but if it is set to an integer like the code above it fails because it is type PanelFrames not an integer.
PanelFrames is another model that has a one to many relationship with Panels, each Panel can have only one PanelFrame so in the database this is recorded as simply an integer, the PanelFrames ID.
How do I reconcile this so that the integer (which is the PanelFrame ID) get's passed through the API and recorded in the database. The MS documentation doesn't seem to cover this, though it seems like it would be a pretty common occurrence, so I must not be understanding something, or doing something very wrong.
If you use EF Core one-to-many relationships and save the principle entity(PanelFrames) id,you just need to add a foreign key for your navigation property in your Panel model.Refer to my below demo:
1.Models
public class Panels
{
[Key]
public int ID { get; set; }
public string Desc { get; set; }
public int FrameID { get; set; }
[ForeignKey("FrameID")]
public PanelFrames Frame { get; set; }
public bool AC240v { get; set; }
}
public class PanelFrames
{
[Key]
public int PanelFramesID { get; set; }
public string Name { get; set; }
public List<Panels> Panels { get; set; }
}
2.In my case, I pass json data using postman, so I need to use [FromBody] on action parameters.
json:
{
"desc": "test5",
"frameid": 2,
"aC240v": false
}
Action:
[HttpPost]
public ActionResult<Panels> CreateNewPanel([FromBody]Panels panel)
Then a new Panel with FrameId would be added into database.
3.If you need to get panels with their Frame, just use Include method in action like
using Microsoft.EntityFrameworkCore;//Add necessary namespaces before
//...
var panels= _context.Panels
.Include(p => p.Frame)
.ToList();
I've a situation where entity framework core (2.0) is performing additional work to a parent table when I update a row in a child table. I've pin-pointed the cause to a value not being set in the unflattened object tree produced by AutoMapper (I'm not saying it is an error in AutoMapper; it's probably more to do with my code).
I'm using ASP.NET Core 2.0, C#, EF Core 2.0 and AutoMapper for the API development side. The database already exists and the EF classes scaffolded from it.
To keep it short, the child table is Note and the parent table is NoteType. The EF classes (extraneous columns removed) are as follows :
//Entity classes
public partial class Note
{
public int NoteBookId { get; set; }
public short NoteSeqNo { get; set; }
public short NoteTypeId { get; set; }
public string NoteText { get; set; }
public NoteBook NoteBook { get; set; }
public NoteType NoteType { get; set; }
}
public partial class NoteType
{
public NoteType() { Note = new HashSet<Note>(); }
public short NoteTypeId { get; set; }
public string NoteTypeDesc { get; set; }
public ICollection<Note> Note { get; set; }
}
//DTO class
public class NoteDto
{
public int NoteBookId { get; set; }
public short NoteSeqNo { get; set; }
public short NoteTypeId { get; set; }
public string NoteTypeNoteTypeDesc { get; set; }
public string NoteText { get; set; }
}
public class NoteTypeDto
{
public short NoteTypeId { get; set; }
public string NoteTypeDesc { get; set; }
}
(NoteBookId + NoteSeqNo) is Note's primary key.
NoteTypeId is the NoteType's primary key.
Configuration
This is the AutoMapper configuration:
// config in startup.cs
config.CreateMap<Note,NoteDto>().ReverseMap();
config.CreateMap<NoteType,NoteTypeDto>().ReverseMap();
Read the data
As a result of data retrieval I get the expected result and the parent note type description is populated.
// EF get note in repository
return await _dbcontext.Note
.Where(n => n.NoteId == noteId && n.NoteSeqNo == noteSeqNo)
.Include(n => n.NoteType)
.FirstOrDefaultAsync();
// Get note function in API controller
Note note = await _repository.GetNoteAsync(id, seq);
NoteDto noteDto = Mapper.Map<NoteDto>(note);
Example JSON result:
{
"noteBookId": 29,
"noteSeqNo": 19,
"noteTypeId": 18,
"noteTypenoteTypeDesc": "ABCDE",
"noteText": "My notes here."
}
Update the data
When the process is reversed during an update, the API controller maps the dto to the entity
Mapper.Map<Note>(noteDto)
Then when it is passed to EF by the repository code, EF tries to add a NoteType row with id 0. The unflattened object tree looks like this:
Note
NoteBookId = 29
NoteSeqNo = 19
NoteTypeId = 18
NoteTypeNoteTypeDesc = "ABCDE"
NoteText = "My notes updated."
NoteType.NoteTypeDesc = "ABCDE"
NoteType.NoteTypeId = 0
The parent id column (NoteType.NoteTypeId) value is 0 and is not assigned the value of 18 which is what I expected.
(During debugging I manually set NoteType.NoteTypeId to 18 to ensure EF did nothing with it).
To work around this at the moment I nullify the NoteType in the Note in the repository code.
Should I expected AutoMapper to populate all the parent properties with setters or have I missed some configuration? Perhaps there is a glaring flaw in my approach?
When AutoMapper reverses the mapping, it has to collect all information for nested objects from the flat object. Your DTO only carries a value for the mapping NoteType -> NoteTypeDesc. Not for NoteType -> NoteTypeId, so AM really doesn't have any idea where to get that value from.
If you want to rely on flattening only, the only way to change that is to add a flattened NoteTypeId to the DTO besides the unflattened one:
public class NoteDto
{
public int NoteBookId { get; set; }
public short NoteSeqNo { get; set; }
public short NoteTypeId { get; set; } // Not flattened
public short NoteTypeNoteTypeId { get; set; } // Flattened
public string NoteTypeNoteTypeDesc { get; set; }
public string NoteText { get; set; }
}
The alternative is to add this to your mapping:
config.CreateMap<Note, NoteDto>()
.ForMember(dest => dest.NoteTypeId,
e => e.MapFrom(src => src.NoteType.NoteTypeId))
.ReverseMap();
MapFrom-s (including the default unflattening) are reversed now. You can drop ReverseMap and create the maps, ignore Note.NoteType or ignore the offending path, Note.NoteType.NoteTypeDesc.
Sorry for newbie questions, i'm brand new to MVC and OOP
I have the following model for my USER db table
namespace MyApp.Models
{
public class User
{
public int user_id { get; set; }
public string username { get; set; }
public string password { get; set; }
public string salt { get; set; }
public string email { get; set; }
public sbyte status { get; set; }
public System.DateTime creation_date { get; set; }
public sbyte type { get; set; }
public virtual Doctor Doctor { get; set; }
public virtual Owner Owner { get; set; }
public virtual UserToken UserToken { get; set; }
public virtual Veterinarian Veterinarian { get; set; }
}
}
Actually in order to recall a particular USER based on the mail or the id i use a specific class called CustomDbFunctions
namespace MyApp.Models.DAL
{
public static class CustomDbFunctions
{
public static User GetUserEntityFromEmail(string email, DbContext db)
{
return db.Users.FirstOrDefault(u => u.email == (string)email);
}
}
}
in that way i use in my code
User user = CustomDbFunctions.GetUserEntityFromEmail(email, db)
and this it 100% OK with me, but i don't know if this kind of approach is correct or not, or if there's a better way like
//select the single user by calling only the class USER
User mySelectedUser = new User(email)
Thank you very much.
Well for understanding how to access your data in your MVC4 application you could read this tutorial from the Asp.Net MVC main page. Read the whole tutorial about MVC4 and you'll get a solid idea on how to work with it.
But I also recommend this tutorial on a good Entityframework design pattern, it's called Repository Pattern, I just a nice way to get all your code ordered (like all other patterns). Let me know.
I get this webservice error sometimes on a SL5 + EF + WCF app.
"Parameter 'role' of domain operation entry 'AddUserPresentationModelToRole' must be one of the predefined serializable types."
here is a similar error, however his solution doesn't work for me.
I have the codegenned DomainService which surfaces the database entities to my client:
[EnableClientAccess()]
public partial class ClientAppDomainService : LinqToEntitiesDomainService<ClientAppUserEntitlementReviewEntities>
{
public IQueryable<Account> GetAccounts()
{
return this.ObjectContext.Accounts;
}
//..etc...
and my custom service which is surfacing a Presentation model, and db entities.
[EnableClientAccess]
[LinqToEntitiesDomainServiceDescriptionProvider(typeof(ClientAppUserEntitlementReviewEntities))]
public class UserColourService : DomainService
{
[Update(UsingCustomMethod = true)]
public void AddUserPresentationModelToRole(UserPresentationModel userPM, Role role, Reviewer reviewer)
{
...
}
public IDictionary<long, byte> GetColourStatesOfUsers(IEnumerable<RBSUser> listOfUsers, string adLogin)
{
//....
}
}
and the PresentationModel:
public class UserPresentationModel
{
[Key]
public long UserID { get; set; }
public byte UserStatusColour { get; set; }
public string MessageText { get; set; }
[Include]
[Association("asdf", "UserID", "UserID")]
public EntityCollection<Account> Accounts { get; set; }
public DateTime AddedDate { get; set; }
public Nullable<long> CostCentreID { get; set; }
public DateTime? DeletedDate { get; set; }
public string EmailAddress { get; set; }
public long EmployeeID { get; set; }
public string FirstName { get; set; }
public Nullable<bool> IsLeaver { get; set; }
public string LastName { get; set; }
public DateTime LastSeenDate { get; set; }
public string LoginDomain { get; set; }
public string LoginName { get; set; }
public byte WorldBuilderStatusID { get; set; }
}
Also cannot get the solution to reliably fail. It seems whenever I change the service slightly ie make it recompile, everything works.
RIAServices unsupported types on hand-built DomainService - seems to be saying the same thing, that decorating the hand built services with the LinqToEntitiesDomainServiceDescriptionProvider should work.
Possible answer here will post back here too with results.
From Colin Blair:
I am a bit surprised it ever works, I don't think I have seen anyone trying to pass additional entiities into a named update before. It might be a bug in RIA Services that it is working at all. What are you trying to accomplish?
Side note, you have a memory leak with your ObjectContext since it is not getting disposed of correctly. Is there a reason you aren't using the LinqToEntitiesDomainSerivce? It would take care of managing the ObjectContext's lifetime for you.
Results:
1) This makes sense. Have refactored out to more sensible parameters now (ints / strings), and all working.
2) Have brought together my 3 separate services into 1 service, which is using the LinqToEntitiesDomainSerivce. The reason I'd split it out before was the assumption that having a CustomUpdate with a PresentationModel didn't work.. and I had to inherit off DomainService instead. I got around this by making a method:
// need this to avoid compile errors for AddUserPresentationModelToRole.. should never be called
public IQueryable<UserPresentationModel> GetUserPresentationModel()
{
return null;
}
I am using MVC3 and Entity Framework. I have a class called User with 20 different properties. I have already created a database and filled it with some data. I want to break out the Addresses property and make it it's own class.
namespace NameSpace.Domain.Entities
{
public class User
{
public int UserId { get; set; }
...
...
public string AddressOne { get; set; }
public string AddressTwo { get; set; }
}
}
I want to break out both Addresses like so
namespace NameSpace.Domain.Entities
{
public class User
{
public int UserId { get; set; }
...
...
public Addresses Addresses { get; set; }
}
public class Addresses
{
public string AddressOne { get; set; }
public string AddressTwo { get; set; }
}
}
HERE'S MY QUESTION:
Since I already have the data table filled with data, how can I update this in the Server Explorer?
Thanks ( if you need more info please let me know )
If you are using EF code first 4.3 you can use the concept of migrations to achive what you want.
You will need to do a code based manual migration since you change is a bit to advanced for the framework to figure it out itselfe.
Further reading: http://blogs.msdn.com/b/adonet/archive/2012/02/09/ef-4-3-code-based-migrations-walkthrough.aspx