Cascade Delete for MySQL and ASP.NET MVC4 - mysql

Question

I have create simple asp.net (MVC4) web page with mysql database. There I have two tables (persons and orders), where table orders have FORIGN Key Persons_ID. I whant to create delete function, so, when I delete person from persons table, it will also delete all orders from order table for this person.
For creating models I have used ADO.NET and it create this two models for each tables:
persons.cs
using System.ComponentModel.DataAnnotations;
namespace MvcMySQLTest1.Models
{
using System;
using System.Collections.Generic;
public partial class person
{
public person()
{
this.orders = new HashSet<order>();
}
public int ID { get; set; }
public string LastName { get; set; }
public string FirstName { get; set; }
public string Adress { get; set; }
public string City { get; set; }
public virtual ICollection<order> orders { get; set; }
}
}
orders.cs
using System.Data.Entity;
using System.Data.Entity.ModelConfiguration.Conventions;
namespace MvcMySQLTest1.Models
{
using System;
using System.Collections.Generic;
public partial class order
{
public int O_Id { get; set; }
public int OrderNo { get; set; }
public Nullable<int> Persons_Id { get; set; }
public virtual person person { get; set; }
}
}
I have also create MainModel - like I container for both models above:
using System;
using System.Collections.Generic;
using System.Data.Entity;
using System.Data.Entity.ModelConfiguration.Conventions;
using System.Linq;
using System.Web;
namespace MvcMySQLTest1.Models
{
public class MainModel
{
public person Persons { get; set; }
public order Orders { get; set; }
}
}
Now for Cascade deleting I have try this - so when I delete Person, it will also delete all Orders for this Person in order table, but this seems not to work:
using System;
using System.Collections.Generic;
using System.Data.Entity;
using System.Data.Entity.ModelConfiguration.Conventions;
using System.Linq;
using System.Web;
namespace MvcMySQLTest1.Models
{
public class MainModel : DbContext //added
{
public person Persons { get; set; }
public order Orders { get; set; }
//added
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Entity<orders>()
.HasOptional(a => a.persons)
.WithOptionalDependent()
.WillCascadeOnDelete(true);
base.OnModelCreating(modelBuilder);
}
}
}

Answer 1

May be you can try something like this
modelBuilder.Entity<order>()
.HasRequired(a => a.person)
.WithMany(t => t.order)
.HasForeignKey(d => d.Persons_Id)
.WillCascadeOnDelete(true);
Or try to read more here MSDN Cascade Delete. May something can help from there