Dapper Plus - Identity Key Propagation - ThenForEach Method

CSharp · Console

/Program.cs

// Dapper Plus
// Doc: https://dapper-plus.net/identity-key-propagation

// @nuget: Dapper
// @nuget: Microsoft.Data.SqlClient
// @nuget: Z.Dapper.Plus

using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using System.Linq;
using Microsoft.Data.SqlClient;
using Dapper;
using Z.Dapper.Plus;

public class Program
{	
	public static void Main()
	{
		// Map your entity
		DapperPlusManager.Entity<Order>().Identity(x => x.OrderID);
		DapperPlusManager.Entity<OrderItem>().Identity(x => x.OrderItemID);
		
		var connection = new SqlConnection(FiddleHelper.GetConnectionStringSqlServer());
		connection.CreateTable<Order>();
		connection.CreateTable<OrderItem>();

		// Get new orders
		var newOrders = GetNewOrders();
		
		// Save orders
		connection.BulkInsert(newOrders)
			.ThenForEach(x => x.Items?.ForEach(y => y.OrderID = x.OrderID))
			.ThenBulkInsert(x => x.Items);
		
		FiddleHelper.WriteTable("1 - Orders", connection.Query<Order>("SELECT * FROM [Order]"));
		FiddleHelper.WriteTable("2 - OrderItems", connection.Query<OrderItem>("SELECT * FROM [OrderItem]"));
	}
	
	public static List<Order> GetNewOrders()
	{
		var orders = new List<Order>();
		
		// order #1
		orders.Add(new Order() { State = "New", Items = new List<OrderItem>() {
				new OrderItem() { ProductName = "Dapper Plus", Quantity = 9 },
				new OrderItem() { ProductName = "C# Eval Expression", Quantity = 14 }	
			}
		});
		
		// order #2
		orders.Add(new Order() { State = "New", Items = new List<OrderItem>() {
				new OrderItem() { ProductName = "Entity Framework Extensions", Quantity = 19 }	
			}
		});
		
		return orders;
	}
	
	[Table("Order")]
	public class Order
	{
		[Key]
		[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
		public int OrderID { get; set; }
		public string State { get; set; }	
		
		public List<OrderItem> Items { get; set; }
	}
	
	[Table("OrderItem")]
	public class OrderItem
	{
		[Key]
		[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
		public int OrderItemID { get; set; }
		public int OrderID { get; set; }
		public string ProductName { get; set; }
		public int Quantity { get; set; }
	}
}