using simple queries in ASP.NET MVC

Question

I checked google but found nothing good. I am searching for usinf Traditional SQL queries in MVC instead of Entity framework etc. So it would be go

Answer 1

So just add a Helper class and write whatever you need (Sql connections,commands,queries...), then call these helper methods from your controller.It's not different than old style

Static Helper Class:

public static class HelperFunctions
{
    private static string connString = "your connection string";

    public static IEnumerable<User> GetAllUsers()
    {
        using (var conn = new SqlConnection(connString))
        using (var cmd = new SqlCommand(connection:conn))
        {
            // set your command text, execute your command 
            // get results and return
        }
    }

In your Controller:

public ActionResult Users()
    {
      // Get user list
        IEnumerable<User> users = HelperFunctions.GetAllUsers();

        // Return your view and pass it to your list
        return View(users);
    }

In your View set your View model:

@model IEnumerable<User>

Then you can access your user list from your View, for example:

foreach(var user in Model)
{
   <p> @user.Name </p>
}

Model represents your actual View Model.If you want access more than one list from your View, you can use ViewBag or ViewData. Check this article for more information: http://www.codeproject.com/Articles/476967/WhatplusisplusViewData-2cplusViewBagplusandplusTem

Answer 2

Using entity framework it can be done

Entitiesdb db = new Entitiesdb();
string query="delete from tableA where id=@id"
db.Database.ExecuteSqlCommand(query, @id);

Answer 3

Simplest example:

//Domain Class
using System;
using System.Collections.Generic;
using System.Data.SqlClient;
using System.Linq;
using System.Web;

namespace BanjoOnMyKnee.Models
{
    public class DomainModel
    {
        public string connectionString = ".\\SQLEXPRESS; Initial-Catalog=YourDBName; Integrated-Security=true";
        public void CreateSomething(ViewModel model)
        {
            using(SqlConnection connection = new SqlConnection(connectionString))
            using (SqlCommand command = new SqlCommand("",connection))
            {
                command.CommandText = "insert into Names values(@Name)";
                command.Parameters.AddWithValue("@Name", model.Name);
                command.ExecuteNonQuery();
            }
        }

        public ViewModel FindSomething(int id)
        {
            var model = new ViewModel();
            using (SqlConnection connection = new SqlConnection(connectionString))
            using (SqlCommand command = new SqlCommand("", connection))
            {
                command.CommandText = "select * from Names where Id=@Id";
                command.Parameters.AddWithValue("@Id",id);
                SqlDataReader reader = command.ExecuteReader();
                model.Id = id;
                model.Name = reader["Name"].ToString();
            }
            return model;
        }

        public void DeleteSomething(ViewModel model)
        {
            using (SqlConnection connection = new SqlConnection(connectionString))
            using (SqlCommand command = new SqlCommand("", connection))
            {
                command.CommandText = "delete from Names where Id=@Id";
                command.Parameters.AddWithValue("@Id", model.Id);
                command.ExecuteNonQuery();
            }
        }

        public void EditSomething(ViewModel model)
        {
            using (SqlConnection connection = new SqlConnection(connectionString))
            using (SqlCommand command = new SqlCommand("", connection))
            {
                command.CommandText = "Update Names set Name=@Name where Id=@Id";
                command.Parameters.AddWithValue("@Name", model.Name);
                command.Parameters.AddWithValue("@Id", model.Id);
                command.ExecuteNonQuery();
            }
        }
    }
}

And here's my controller class

//My Controller class
public class HomeController : Controller
{
    //
    // GET: /Home/

    public ActionResult Index()
    {
        return View();
    }

    //
    // GET: /Home/Create

    public ActionResult Create()
    {
        return View(new ViewModel());
    }

    //
    // POST: /Home/Create

    [HttpPost]
    public ActionResult Create(ViewModel vm)
    {
        try
        {
            var domainModel = new DomainModel();
            domainModel.CreateSomething(vm);
            return RedirectToAction("Index");
        }
        catch
        {
            return View(new ViewModel());
        }
    }

    //
    // GET: /Home/Edit/5

    public ActionResult Edit(int id)
    {
        ViewModel model = new DomainModel().FindSomething(id);
        return View(model);
    }


    [HttpPost]
    public ActionResult Edit(ViewModel editModel)
    {
        try
        {
            var dm = new DomainModel();
            dm.EditSomething(editModel);
            return RedirectToAction("Index");
        }
        catch
        {
            return View(new ViewModel());
        }
    }
 }

My ViewModel class

//My ViewModel
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace BanjoOnMyKnee.Models
{
    public class ViewModel
    {
        public int Id { get; set; }
        public string Name { get; set; }
    }
}

And my 'Create' View

//My view
@model BanjoOnMyKnee.Models.ViewModel

@{
    ViewBag.Title = "Create";
}

<h2>Create</h2>

@using(Html.BeginForm()){
    @Html.HiddenFor(m => m.Id);
    <p> Name : 
        Html.EditorFor(m=>m.Name);</p>
    <input type="submit" value="Create" />
}

Answer 4

how about writing stored procedures and just invoke them as methods using by just adding a LinQ to Sql Class into your project this will make it much easier for dealing with database
after making the needed stored procedures :

• right click in your project then add new item then choose a LinQ to SQL Class and name it
• drag and drop your previously made stored procedures
• make an instance of your linq to sql class

then you can invoke your stored procedures and members of this class
http://msdn.microsoft.com/en-us/library/bb386946(v=vs.110).aspx this link may help you as well