using stored procedure in entity framework

问题:

I am using asp.net mvc 5 and C# with Entity Framework... I have model and domain classes for function... now I need to use stored procedure.... which I am struggling at the movement.

I am following code first existing database and I have stored procedure written there. My question is how I can call that stored procedure in my web application.

Stored procedure:

ALTER PROCEDURE [dbo].[GetFunctionByID](
    @FunctionId INT
)
AS
BEGIN
    SELECT * 
    FROM Functions As Fun
    WHERE Function_ID = @FunctionId
END

Domain class:

 public class Functions
 {
    public Functions()
    {
    }

    public int Function_ID { get; set; }
    public string Title { get; set; }
    public int Hierarchy_level { get; set; }
}

Function model:

[Table("Functions")]
public class App_Functions
{
    public App_Functions()
    {
    }

    [Key]
    public int Function_ID { get; set; }

    [StringLength(50)]
    [Required]
    public string Title { get; set; }

    public int Hierarchy_level { get; set; }
    //public virtual ICollection<App_Controllers> App_Controllers { get; set; }*/
}

BaseContext:

public class BaseContext<TContext> : DbContext where TContext : DbContext
{
    static BaseContext()
    {
        Database.SetInitializer<TContext>(null);
    }

    protected BaseContext()
        : base("name = ApplicationDbConnection")
    { }
}

Function context:

public class FunctionsContext : BaseContext<FunctionsContext>
{
    public DbSet<App_Functions> Functions { get; set; }
}

回答1:

You need to create a model class that contains all stored procedure properties like below. Also because Entity Framework model class needs primary key, you can create a fake key by using Guid.

public class GetFunctionByID
{
    [Key]
    public Guid? GetFunctionByID { get; set; }

    // All the other properties.
}

then register the GetFunctionByID model class in your DbContext.

public class FunctionsContext : BaseContext<FunctionsContext>
{
    public DbSet<App_Functions> Functions { get; set; }
    public DbSet<GetFunctionByID> GetFunctionByIds {get;set;}
}

When you call your stored procedure, just see below:

var functionId = yourIdParameter;
var result =  db.Database.SqlQuery<GetFunctionByID>("GetFunctionByID @FunctionId", new SqlParameter("@FunctionId", functionId)).ToList());

回答2:

You can call a stored procedure using SqlQuery (See here)

// Prepare the query
var query = context.Functions.SqlQuery(
    "EXEC [dbo].[GetFunctionByID] @p1", 
    new SqlParameter("p1", 200));

// add NoTracking() if required

// Fetch the results
var result = query.ToList();

回答3:

After importing stored procedure, you can create object of stored procedure pass the parameter like function

using (var entity = new FunctionsContext())
{
   var DBdata = entity.GetFunctionByID(5).ToList<Functions>();
}

or you can also use SqlQuery

using (var entity = new FunctionsContext())
{
    var Parameter = new SqlParameter {
                     ParameterName = "FunctionId",
                     Value = 5
            };

    var DBdata = entity.Database.SqlQuery<Course>("exec GetFunctionByID @FunctionId ", Parameter).ToList<Functions>();
}

回答4:

Mindless passenger has a project that allows you to call a stored proc from entity frame work like this....

using (testentities te = new testentities())
{
    //-------------------------------------------------------------
    // Simple stored proc
    //-------------------------------------------------------------
    var parms1 = new testone() { inparm = "abcd" };
    var results1 = te.CallStoredProc<testone>(te.testoneproc, parms1);
    var r1 = results1.ToList<TestOneResultSet>();
}

... and I am working on a stored procedure framework (here) which you can call like in one of my test methods shown below...

[TestClass]
public class TenantDataBasedTests : BaseIntegrationTest
{
    [TestMethod]
    public void GetTenantForName_ReturnsOneRecord()
    {
        // ARRANGE
        const int expectedCount = 1;
        const string expectedName = "Me";

        // Build the paraemeters object
        var parameters = new GetTenantForTenantNameParameters
        {
            TenantName = expectedName
        };

        // get an instance of the stored procedure passing the parameters
        var procedure = new GetTenantForTenantNameProcedure(parameters);

        // Initialise the procedure name and schema from procedure attributes
        procedure.InitializeFromAttributes();

        // Add some tenants to context so we have something for the procedure to return!
        AddTenentsToContext(Context);

        // ACT
        // Get the results by calling the stored procedure from the context extention method 
        var results = Context.ExecuteStoredProcedure(procedure);

        // ASSERT
        Assert.AreEqual(expectedCount, results.Count);
    }
}

internal class GetTenantForTenantNameParameters
{
    [Name("TenantName")]
    [Size(100)]
    [ParameterDbType(SqlDbType.VarChar)]
    public string TenantName { get; set; }
}

[Schema("app")]
[Name("Tenant_GetForTenantName")]
internal class GetTenantForTenantNameProcedure
    : StoredProcedureBase<TenantResultRow, GetTenantForTenantNameParameters>
{
    public GetTenantForTenantNameProcedure(
        GetTenantForTenantNameParameters parameters)
        : base(parameters)
    {
    }
}

If either of those two approaches are any good?

回答5:

// Add some tenants to context so we have something for the procedure to return! AddTenentsToContext(Context);

    // ACT
    // Get the results by calling the stored procedure from the context extention method 
    var results = Context.ExecuteStoredProcedure(procedure);

    // ASSERT
    Assert.AreEqual(expectedCount, results.Count);
}

回答6:

Simple. Just instantiate your entity, set it to an object and pass it to your view in your controller.

Entity

VehicleInfoEntities db = new VehicleInfoEntities();

Stored Procedure

dbo.prcGetMakes()

or

you can add any parameters in your stored procedure inside the brackets ()

dbo.prcGetMakes("BMW")

Controller

public class HomeController : Controller
{
    VehicleInfoEntities db = new VehicleInfoEntities();

    public ActionResult Index()
    {
        var makes = db.prcGetMakes(null);

        return View(makes);
    }
}