Executing Raw sql with Entity Framework Core - entity-framework

Question

The below I can have a condition to execute view/table, which would load into AccountDataModel class.
dbcontext.AccountDataModel.FromSql($"select * from account where id=123").FirstOrDefault();
How can I retrieve without using a class model, if I want to retrieve just 1 or 2 columns
example: select name from account where id=123
Do I always need a class model?

Answer 1

ADO.NET works in EFCore =)
using Microsoft.EntityFrameworkCore;
using System.Data.Common;
using System.Data.SqlClient;
using System;
public void ExampleMethod(DbContext context)
{
SomeObjectResult result = null;
DbCommand cmd = context.Database.GetDbConnection().CreateCommand();
cmd.CommandText = "Select C.ID, C.CarModelID as ModelID, C.VIN, C.RegNumber,cast(C.CountValue as int) as Course,A.BrandID from A inner join C on A.ID = C.KeyID Where A.ID = #appID";
cmd.Parameters.Add(new SqlParameter("#appID", appointmentID));
if (cmd.Connection.State != ConnectionState.Open)
{
cmd.Connection.Open();
}
using (var reader = await cmd.ExecuteReaderAsync())
{
if (reader.Read())
{
result = new SomeObjectResult()
{
BrandID = (int)reader["BrandID"],
Course = (int)reader["Course"],
ID = (int)reader["ID"],
ModelID = (int?)reader["ModelID"],
RegNumber = (string)reader["RegNumber"],
VIN = (string)reader["VIN"]
};
}
}
}

Answer 2

Yes. like this :
var account = dbcontext.AccountDataModel.FromSql(#"select a.id, a.name from account a where a.id=123");
source : FromSql for non entity type

Answer 3

This queries the database
var name = dbcontext.GetDBConnection().Query("select name from account where id=123").FirstOrDefault();