I have created a stored procedure which returns columns dynamically , but i'm unable to import it into entity framework
Does anybody know how to import a stored procedure that returns columns dynamically
EF doesn't support stored procedure with dynamic result set. The result set must be fixed for EF to map it to complex type / entity type.
Related
Is it possible to define an Entity that is not mapped to a table in database and to use a stored procedure to return the entries?
I found that I can use "Ignore" so the table in database is not created for an Entity, but how can I set a stored procedure to populate data for this entity?
Note: I am using code first.
Thanks.
You could create a normal model class that's not referenced by your database context. The model class should contain the properties you'll be returning from your stored proc. Then use
context.Database.ExecuteSqlCommand("storedProc", params)
// OR
context.Database.SqlQuery<YourEntityType>("storedProc",params);
I have a stored procedure that gets many input parameters (the procedure persoms Insert statement)
I use EF to access this procedure.
Is there a way to automatically generate object type that contains all the input parameters of the procedure?
Something like the complex type that is being generated for the output of the procedure.
My EF version is 6.1.3
No, I don't think it's possible to automatically generate a class for the input parameters of a stored procedure in EF 6.1.3.
This article helped me in working with insert stored procedure with the entity framework:
http://www.entityframeworktutorial.net/EntityFramework5/CRUD-using-stored-procedures.aspx
I'm using Entity Framework 6 with .Net 4.5. I have a stored procedure that select and returns data. One of the return columns is a geography type.
In Visual Studio 2013, I right click the .edmx file, click "Update Model From Database...". This action gets my stored procedure and creates a complex type of storeprocedurename_Result. All the columns are represented in the complex type objects except the geography type.
I don't want to manually modify the complex type. I want to get it automatically via clicking "Update Model From Database...". Does Entity Framework 6 support this? And what are the step to implement this feature?
Entity Framework won't handle this automatically, but it's pretty simple to add the geography column after the procedure is imported.
In the Model Browser, search or navigate to your stored procedure's complex type. Right-click, and select Add -> Scalar Property -> Geography (or any other type that you are missing):
Enter the name of your column:
Save your model.
We're using a Function Import in an EF4 model to populate an existing entity in our Model. The entity in the model has a Key field of Id which we're struggling to map as our stored procedure doesn't return an Id field. I've tried setting the value in the mapping to a literal value of 0 but that fails with an EntityCommandExecutionException and the following exception text.
The data reader is incompatible with the specified 'Candidate'. A member of the type, 'Id', does not have a corresponding column in the data reader with the same name.
Short of modifying the stored procedure to return a dummy Id field can anyone recommend what the best approach is for this as the dummy field option feels very clunky to me.
Many Thanks
If you can't return enough data to fully materialize the entity -- and the Id field is certainly going to be required for that -- then you need to change the return type on the proc to be a complex type instead of an entity.
Use another POCO class with the same structure to receive the results of the stored procedure call, here's an example:
string sp = string.Format("EXEC dbo.spComercialesAsociadosActivos {0}", idComercialPrincipal);
return ((IObjectContextAdapter)this).ObjectContext.ExecuteStoreQuery<InfoComercial>(sp);
In this case "InfoComercial" is a POCO class with the same structure as "Comercial", which is tied up to EF code first in the DBContext, then I used this independent class in the viewModel to create a disconnected "Comercial", it's not an ideal solution but will work fine until EF 5 comes with SP support.
We are using ado.net entity framework 4.0 for our database layer and I am a newbie to ado.net entity framework. I have created entity via adding a entity in entity framework. I want to map that entity with stored procedure only not table of the database. Stored procedure will return same column as entity. How it is possible and how i can do that without mapping to table?
Here is a complete walkthrough http://msdn.microsoft.com/en-us/library/cc716679.aspx
Its not possible because an ObjectSet is an IQueryable and mapping an ObjectSet to stored procedure would not give u an IQueryable because stored procedures by their very nature cannot be composed. The best you can do is take the content inside the stored procedure and put into a view and map the view to an ObjectSet which is possible.
You need to create a complex type, not an entity. Open up the model browser and import your stored procedure as a "function import" (your SP must not use #tempTables but you can use #tableVariables instead); in the function import wizard you'll see a "create complex type" button.
The SP becomes a method in the model context and you can use it to get IEnumerable[TheComplexType].
In EF4.1 code-first it's even simpler, you put a [ComplexType] attribute on top of any class and you can use that type as a return type for context.ExecuteStoreQuery[T]. If your properties are named exactly as the returned columns are (and the types line up), the mapping is "magic" - it just works.