自动更新实体框架中的实体

Question

I have a simple database and I use Entity Framework to perfom queries.

Customer.cs

namespace DataAccess.Entities
{
    [Table("Customer")]
    public partial class Customer
    {
        public int CustomerId { get; set; }

        [Required]
        [StringLength(50)]
        public string CustomerName { get; set; }

        public int StatusId { get; set; }

        public virtual Status Status { get; set; }
     }
}

Context.cs

public partial class Context : DbContext
{
    public Context()
        : base("name=DefaultConnection")
    {
    }

    public virtual DbSet<Customer> Customer { get; set; }
    public virtual DbSet<Status> Status { get; set; }

    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        modelBuilder.Entity<Customer>()
            .Property(e => e.CustomerName)
            .IsUnicode(false);

        modelBuilder.Entity<Status>()
            .HasMany(e => e.Customer)
            .WithRequired(e => e.Status)
            .WillCascadeOnDelete(false);
    }
}

But if my database change, how to update my entities and the OnModelCreating method ? Without do this manually ?

Thank's

Answer 1

只要您使用“代码优先”方法，对数据库的每次更改都应该通过模型完成，因此您不应处理所陈述的问题，并且可以假定数据库结构与模型匹配

Answer 2

If you are using Asp.Net MVC, you can use Migrations in Package Manager Console as shown below.

1. enable-migrations
2. add-migration InitialModel
3. Update-database

For default data/enums you should use seeding. For seeding in Package Manager Console

1. add-migration PopulateStatus

a partial class with the name PopulateStatus will open, in up() method, you should write the SQl commands to insert default data. In your case its Status table. Then update database command in package manager

2. Update-database

For better understanding you can look here