PrimaryKey

• The combination of columns that represents a unique identifier for a row.

• In other words - how can the code identify one single row.
• The PrimaryKey is used whenever the code needs to identify a unique row, for example when performing an "Update" or "Delete" or "Lock" operation.
• We can highlight more than one column using the PrimaryKey attribute, and all the highlighted columns will be used.
• We'll use the PrimaryKey attribute to highlight the column(s)

using System;
using System.Collections.Generic;
using System.Text;
using Firefly.Box;
using ENV.Data;

namespace Northwind.Models
{ 
    public class Students : Entity
    {
        [PrimaryKey]
        public readonly NumberColumn Id = new NumberColumn("Id", "5");
        public readonly TextColumn LastName = new TextColumn("LastName", "30");
        public readonly TextColumn FirstName = new TextColumn("FirstName", "30");
        public Students()
           : base("Students", Northwind.Shared.DataSources.Northwind1)
        {
        }
    }
} 

---

Help us improve, Edit this page on GitHub
or email us at info@fireflymigration.com