In this article I will explain with an example, how to delete data from database with
Stored Procedure using
Dapper library in ASP.Net Core MVC.
Installing Dapper package using Nuget
Database
I have made use of the following table Customers with the schema as follows.
I have already inserted few records in the table.
Note: You can download the database table SQL by clicking the download link below.
Stored Procedure
This
Stored Procedure accepts
CustomerId parameter, which is used to DELETE the records in
Customers Table.
CREATE PROCEDURE [Customers_DeleteCustomer]
@CustomerId INT
AS
BEGIN
DELETE FROM [Customers]
WHERE CustomerId = @CustomerId
END
Model
The Model class consists of following property.
public class CustomerModel
{
public int CustomerId { get; set; }
}
Namespaces
You will need to import the following namespaces.
using Dapper;
using System.Data;
using System.Data.SqlClient;
Controller
The Controller consists of following Action methods.
Action method for handling GET operation
Inside this Action method, simply the View is returned.
Action method for handling POST operation
This method accepts CustomerModel class object as a parameter.
Inside this Action method, first the connection is read from the ConnectionStrings section of the AppSettings.json file.
Inside this Action method, the name of the
Stored Procedure and the
CustomerModel class object is passed to the
Execute method of the
Dapper library which then deletes the record from the
Customers Table.
Finally, based on whether the record is deleted or not an appropriate message is set into
ViewBag object and View is returned.
public class HomeController : Controller
{
public IConfiguration Configuration { get; set; }
public HomeController(IConfiguration _configuration)
{
this.Configuration = _configuration;
}
public IActionResult Index()
{
return View();
}
[HttpPost]
public IActionResult Index(CustomerModel model)
{
string constr = this.Configuration.GetSection("ConnectionStrings")["MyConn"];
string spName = "Customers_DeleteCustomer";
using (SqlConnection con = new SqlConnection(constr))
{
//Create a dynamic object for setting Parameter for the Stored Procedure.
object customer = new
{
CustomerId = model.CustomerId
};
int i = con.Execute(spName, customer, commandType: CommandType.StoredProcedure);
if (i > 0)
{
ViewBag.Message = "Customer record deleted.";
}
else
{
ViewBag.Message = "Customer not found.";
}
}
return View();
}
}
View
HTML Markup
Inside the View, in the very first line the CustomerModel class is declared as Model for the View.
The View consists of an HTML Form which has been created using the following TagHelpers attributes.
asp-action – Name of the Action. In this case the name is Index.
asp-controller – Name of the Controller. In this case the name is Home.
method – It specifies the Form Method i.e. GET or POST. In this case it will be set to POST.
The View also consists of an HTML Table, which consists of a HTML INPUT TextBox created and a Submit Button.
Submitting the Form
Whent the
Delete Button is clicked then, the
ViewBag object is checked for NULL and if it is not NULL then, the value of the
ViewBag object is displayed using
JavaScript Alert Message Box.
@model Dapper_Delete_SP_Core_MVC.Models.CustomerModel
@addTagHelper*, Microsoft.AspNetCore.Mvc.TagHelpers
@{
Layout = null;
}
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width" />
<title>Index</title>
</head>
<body>
<form method="post" asp-controller="Home" asp-action="Index">
<table cellpadding="1" cellspacing="1">
<tr>
<td style="width: 60px">
Id<br />
<input type="text" asp-for="CustomerId" style="width:25px;" />
</td>
<td style="width: 200px">
<br />
<input type="submit" value="Delete" />
</td>
</tr>
</table>
@if (ViewBag.Message != null)
{
<script type="text/javascript">
window.onload = function () {
alert("@ViewBag.Message");
};
</script>
}
</form>
</body>
</html>
Screenshot
Downloads