Como editar un registro en asp net mvc con una llave primaria compuesta por tres

Editing a Record in ASP.NET MVC with a Composite Primary Key

When working with ASP.NET MVC, it is common to come across scenarios where you need to edit a record in a database table that has a composite primary key. A composite primary key is a primary key that consists of two or more columns. In this article, we will explore how to edit a record in ASP.NET MVC with a composite primary key using an .

Let's assume we have a database table called “Employees” with the following columns:

  • EmployeeId (int)
  • CompanyId (int)
  • FirstName (string)
  • LastName (string)

In this example, the composite primary key consists of the “EmployeeId” and “CompanyId” columns.

Step 1: Create the Edit Action Method

To edit a record with a composite primary key, we need to create an action method in our controller that accepts the primary key values as parameters. Here's an example:


public ActionResult Edit(int employeeId, int companyId)
{
    // Retrieve the record from the database using the primary key values
    Employee employee = db.Employees.Find(employeeId, companyId);
    
    // Check if the record exists
    if (employee == null)
    {
        return HttpNotFound();
    }
    
    // Pass the record to the view for editing
    return View(employee);
}

In this code snippet, we retrieve the record from the database using the primary key values as parameters. If the record does not exist, we return a “Not Found” HTTP status code. Otherwise, we pass the record to the view for editing.

Step 2: Create the Edit View

Next, we need to create the edit view that will allow users to modify the record. Here's an example of how the edit view might look like:


@model Employee

@using (Html.BeginForm("Edit", "Employees", FormMethod.Post))
{
    @Html.HiddenFor(model => model.EmployeeId)
    @Html.HiddenFor(model => model.CompanyId)
    
    
@Html.LabelFor(model => model.FirstName) @Html.TextBoxFor(model => model.FirstName)
@Html.LabelFor(model => model.LastName) @Html.TextBoxFor(model => model.LastName)
}

In this code snippet, we use the HTML helpers provided by ASP.NET MVC to generate the form fields for editing the record. We also include hidden fields for the primary key values so that they are when the form is submitted.

Step 3: the Edit Post

Finally, we need to handle the post request when the user submits the form. Here's an example of how the corresponding action method might look like:


[HttpPost]
public ActionResult Edit(Employee employee)
{
    if (ModelState.IsValid)
    {
        // Update the record in the database
        db.(employee).State = EntityState.;
        db.SaveChanges();
        
        return RedirectToAction("Index");
    }
    
    return View(employee);
}

In this code snippet, we update the record in the database by setting its state to “Modified” and then saving the changes. If the model state is valid, we the user to the index page. Otherwise, we return the view with the validation errors.

Conclusion

In this article, we have explored how to edit a record in ASP.NET MVC with a composite primary key. By following the steps outlined above, you should be able to handle editing scenarios where the primary key consists of multiple columns. Remember to the code to your specific requirements and database .

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