In this article I will explain with an example, how to update data into
MySQL database using
Dapper library in ASP.Net Core MVC (.Net Core).
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.
Model
The Model class consists of following properties.
public class CustomerModel
{
public int CustomerId { get; set; }
public string Name { get; set; }
public string Country { get; set; }
}
Namespaces
You will need to import the following namespaces.
using Dapper;
using MySql.Data.MySqlClient;
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.
Then, the SQL query and
CustomerModel class object is passed to the
Execute method of the
Dapper library which then updates the record in the
Customers Table.
Finally, based on whether the record is updated 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 customer)
{
string sql = "UPDATE Customers SET Name=@Name, Country=@Country WHERE CustomerId=@CustomerId";
string constr = this.Configuration.GetSection("ConnectionStrings")["MyConn"];
using (MySqlConnection con = new MySqlConnection(constr))
{
int i = con.Execute(sql, customer);
if (i > 0)
{
ViewBag.Message = "Customer record updated.";
}
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 three HTML INPUT TextBoxes and a Submit Button.
Submitting the Form
When the
Submit 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_Update_MySQL_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>
Id<br />
<input type="text" asp-for="CustomerId" style="width: 60px;" />
</td>
<td>
Name<br />
<input type="text" asp-for="Name" style="width: 150px;" />
</td>
<td>
Country:<br />
<input type="text" asp-for="Country" style="width: 150px;" />
</td>
<td>
<br />
<input type="submit" value="Update" />
</td>
</tr>
</table>
</form>
@if (ViewBag.Message != null)
{
<script type="text/javascript">
window.onload = function () {
alert("@ViewBag.Message");
};
</script>
}
</body>
</html>
Screenshot
Downloads