实体框架代码第一：如何使用比模型属性少的参数映射到存储过程？

Question

I have a model named File with properties CreatedOn and ModifiedOn mapped to columns CreatedOn and ModifiedOn on table File. I don't want values of these columns to be set by users instead, they will be set by using the function GETDATE() in SQL. Following is my code:

This is my model (simplified for test):

public class File
{
    public int? Id { get; set; }
    public DateTime? CreatedOn { get; set; }
    public string Name { get; set; }
    public DateTime? ModifiedOn { get; set; }
}

My model mapping to stored procedures:

public class FileMap: EntityTypeConfiguration<File>
{
    public FileMap()
    {
        MapToStoredProcedures(s => s.Insert(i => i.HasName("InsertFile").Parameter(f => f.Name, "Name")));
    }
}

My migration:

public partial class AddInsertStoredProcedure: DbMigration
{
    public override void Up()
    {
        CreateStoredProcedure(
            "dbo.InsertFile",
            p => new
            {
                Name = p.String(),
            },
            body:
                @"INSERT [dbo].[Files]([CreatedOn], [ModifiedOn], [Name])
                  VALUES (GETDATE(), GETDATE(), @Name)

                  DECLARE @Id int
                  SELECT @Id = [Id]
                  FROM [dbo].[Files]
                  WHERE @@ROWCOUNT > 0 AND [Id] = scope_identity()

                  SELECT t0.[Id]
                  FROM [dbo].[Files] AS t0
                  WHERE @@ROWCOUNT > 0 AND t0.[Id] = @Id"
            );
     /* ... */
}

My test class:

   class Program
{
    static void Main(string[] args)
    {
        var context = new EntityContext();
        context.Files.Add(new File { Name = "File 1" });
        context.Files.Add(new File { Name = "File 2" });
        context.Files.Add(new File { Name = "File 3" });
        context.Files.Add(new File { Name = "File 4" });
        context.SaveChanges();
        Console.WriteLine("Done");
        Console.ReadLine();
    }
}

When running it I receive an exception {"Procedure or function InsertFile has too many arguments specified."}. It seems that EF passed all the properties of my model to the stored procedure InsertFile so there were extra arguments. Can I have EF pass only the property Name?

Answer 1

Try adding attributes to your properties, if you don't need them in the stored procedure:

[DatabaseGenerated(DatabaseGeneratedOption.None)]

If you want to get your properties from the stored procedure use:

[DatabaseGenerated(DatabaseGeneratedOption.Computed)]

and map in Fluent.api like this :

    public FileMap()
    {
        MapToStoredProcedures(s => s.Insert(i => i.HasName("InsertFile").Parameter(f => f.Name, "Name").Result(f => f.ModifiedOn,"ModifiedOn"));
}

For example, this is what I'm using for this:

model:

public partial class Order
{
    [Key]
    [Column(Order = 1)]
    [DatabaseGenerated(DatabaseGeneratedOption.None)]
    public int MasterFID { get; set; }

    [Key]
    [Column(Order = 0)]
    [DatabaseGenerated(DatabaseGeneratedOption.Computed)]
    public int ID { get; set; }

    [StringLength(50)]
    [DatabaseGenerated(DatabaseGeneratedOption.Computed)]
    public string Number { get; set; }

    public int? OutletID { get; set; }

    [DatabaseGenerated(DatabaseGeneratedOption.Computed)]
    public DateTime? OrderDate { get; set; }

    [StringLength(250)]
    public string Comment { get; set; }

    public decimal? Sum { get; set; }

Fluent.Api Mapping:

modelBuilder.Entity<Order>()
                .MapToStoredProcedures(sp =>
                {
                    sp.Insert(i => i.HasName("web_DS_Set_DocHeaders")
                                    .Parameter(p => p.OutletID, "mfID")
                                    .Parameter(p => p.DocTypeID, "orType")
                                    .Parameter(p => p.Comment, "orComment")
                                    .Parameter(p => p.Sum, "orSum")

                                    .Result(r => r.Number, "orNumber")
                                    .Result(r => r.OrderDate,"orDate")
                                    .Result(r => r.ID, "orID"));
                });

And at the end of my stored procedure, I have something like this for return inserted row:

Select orNumber, orDate, orId from Orders where --parameters for last inserted|updated row