MVC Razor - How to update a multiple rows in a selected column from a dropdown list SQL - sql

Question

I think the title says it all...
I want to update a whole table with an input filled value into a selected column (selected from a dropdown list) if the value of another column is equal to a selected value (from another dropdown list). Putting all this together seem pretty hard for me...
Like this kind of Query...
var db = Database.Open("DatabaseX");
var updateCommand = "UPDATE TableX Set SelectedColumn(dropdownlistA) = (InputA) IF ColumnX = Selected Values(dropdownlistB)";
Sorry for my english

Answer 1

If you are having trouble getting the selected values from the dropdown on form submit, you may try this.
Create a view model with properties for the data for the dropdown and the selected option value.
public class CreateUserVm
{
public int SelectedCam { set; get; }
public List<SelectListItem> Cams { set; get; }
public int SelectedCat { set; get; }
public List<SelectListItem> Categories { set; get; }
}
And in your GET action, create an object of this, initialize the collection properties and send tot he view.
public ActionResult Create()
{
var v = new CreateUserVm
{
Categories = new List<SelectListItem>
{
new SelectListItem {Value = "1", Text = "Photo"},
new SelectListItem {Value = "2", Text = "Video"}
},
Cams = new List<SelectListItem>
{
new SelectListItem {Value = "25", Text = "DSLR"},
new SelectListItem {Value = "28", Text = "Point and Shoot"}
}
};
return View(v);
}
Now your create view should be strongly typed to this CreateUserVm class.
#model CreateUserVm
#using(Html.BeginForm())
{
#Html.DropDownListFor(g=>g.SelectedCat, Model.Categories)
#Html.DropDownListFor(g=>g.SelectedCam, Model.Cams)
<input type="submit" />
}
And in your HttpPost action method, we will use the CreateUserVm object as the parameter so that the posted model will be mapped to it by the default model binder.
[HttpPost]
public ActionResult Create(CreateUserVm model)
{
var camId = model.SelectedCam;
var catId = model.SelectedCat;
// use camId and catId to update your db.
// to do : Save and Redirect
}