How to execute stored procedure in EF7 beta8? - asp.net

Question

I'm trying to run stored procedure in EF7 beta8 to return me a specific data. I'm trying to do it via FromSQL command, but not sure if this is right command.
strSQL = wt.DataSource.StoredProc;
foreach (var p in prms)
{
strSQL = strSQL + " #" + p.Name + " = '" + p.Value + "',";
}
strSQL = strSQL.Remove(strSQL.Length - 1); //removes last comma
var test = _dbContext.Widgets.FromSql("EXEC " + strSQL).ToList();
var test2 = _dbContext.Widgets.FromSql("SELECT * FROM Widgets").ToList();
Where test 2 works and returns data correctly, test1 is returning error:
The required column 'Id' was not present in the results of a 'FromSql' operation.
I'm assuming that the data I'm returning is not part of the model. If that's the case, how can I execute stored procedure and return the raw data to List or to DataTable?
EDIT:
I'm trying with SQLCommand:
var connection = (SqlConnection)_dbContext.Database.GetDbConnection();
var command = connection.CreateCommand();
command.CommandType = CommandType.StoredProcedure;
command.CommandText = strSQL;
foreach(var p in prms)
{
command.Parameters.Add("#" + p.Name, p.Value);
}
connection.Open();
var test = command.ExecuteNonQuery();
connection.Close();
Bus still no luck:
No mapping exists from object type Newtonsoft.Json.Linq.JValue to a known managed provider native type.
Is there any other way to execute stored procedure without mapping the entity?

Answer 1

You should be able to use normal SqlCommand and ExecuteReader method to get data from a stored procedure.
Quick sample.
This code executes a stored procedure called GetWidgets which expects 2 parameters, #name and #categoryId and returns a result set which has 2 columns, Id and Name. We are reading the value from the DataReader and creating an object of WidgetDto and appending to a list of WidgetDto.
Your WidgetDto is a simple POCO
public class WidgetDto
{
public int Id {set;get;}
public string Name {set;get;}
}
And the code to execute stored proc is
private List<WidgetDto> GetWidgets(d)
{
var catId= 1;
var name ="test"
//The above values are hard coded for demo. you may replace it
// with whatever your stored proc is expecting.
var list = new List<WidgetDto>();
const string sqlQry = "exec GetWidgets #name,#categoryId";
using (var db = new StudentsEntities())
{
using (var con = (SqlConnection) db.Database.Connection)
{
using (var cmd = new SqlCommand(sqlQry, con))
{
cmd.Parameters.AddWithValue("#name", name);
cmd.Parameters.AddWithValue("#categoryId", catId);
con.Open();
using (var reader = cmd.ExecuteReader())
{
while (reader.Read())
{
var s = new GoodVm();
s.Id = reader.GetInt32(reader.GetOrdinal("Id"));
s.Name = reader.GetString(reader.GetOrdinal("Name"));
list.Add(s);
}
}
}
}
}
return list;
}
In this example, I am using db.DataBase.Connection (Available in ED 6.13 version) property of my DbContext to build the connection. You can build your connection from the legacy way also by using the connection string.