From 4da1dc74954fafe4d21841892bafc955a37ac805 Mon Sep 17 00:00:00 2001 From: muqiuhan Date: Tue, 27 May 2025 06:06:45 +0000 Subject: deploy: 74a1d57ead41454de540829cd6de5ba1f5702bd6 --- .../index.html" | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) (limited to '2025/03/13/领域驱动设计中的“聚合根”/index.html') diff --git "a/2025/03/13/\351\242\206\345\237\237\351\251\261\345\212\250\350\256\276\350\256\241\344\270\255\347\232\204\342\200\234\350\201\232\345\220\210\346\240\271\342\200\235/index.html" "b/2025/03/13/\351\242\206\345\237\237\351\251\261\345\212\250\350\256\276\350\256\241\344\270\255\347\232\204\342\200\234\350\201\232\345\220\210\346\240\271\342\200\235/index.html" index 56df60c9..be156f43 100644 --- "a/2025/03/13/\351\242\206\345\237\237\351\251\261\345\212\250\350\256\276\350\256\241\344\270\255\347\232\204\342\200\234\350\201\232\345\220\210\346\240\271\342\200\235/index.html" +++ "b/2025/03/13/\351\242\206\345\237\237\351\251\261\345\212\250\350\256\276\350\256\241\344\270\255\347\232\204\342\200\234\350\201\232\345\220\210\346\240\271\342\200\235/index.html" @@ -195,15 +195,15 @@

在领域驱动设计（Domain-Driven Design，简称DDD）中，聚合根（Aggregate Root）是聚合（Aggregate）中的核心实体，是一个聚合的入口点和控制者，负责维护聚合内部的一致性和不变性条件。聚合是一组紧密相关的领域对象的集合，这些对象通过一定的业务规则绑定在一起，并被视为一个单元。

主要的作用如下：

其具有以下特性：

用 F# 来描述，以订单管理为例，大概写一下：

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type OrderStatus = 
  | New
  | Shipped
  | Delivered
  | Cancelled

type OrderItem (productName: string, price: float, quantity: int) = 
  do
    if quantity <= 0 then
      failwith "Quantity must be positive"
  
  member public this.ProductName = productName
  member public this.Price = price
  member public this.Quantity = quantity
  member public this.TotalPrice () = price * quantity

type Order (id: int, customerName: string) = 
  let mutable status = OrderStatus.New
  let mutable orderItems = []

  member public this.Id = id
  member public this.CustomerName = customerName
  member public this.Status = status
  member public this.OrderItems = orderItems

  member public this.AddItem (item: OrderItem, price: float, quantity: int) =
    if quantity <= 0 then
      failwith "Quantity must be positive"
    
    orderItems <- orderItems @ [OrderItem(item.ProductName, price, quantity)]

  member public this.ChangeStatus (status: OrderStatus) =
    this.Status <- status

  member public this.TotalPrice () =
    orderItems |> List.sumBy (fun item -> item.TotalPrice())

  member public this.GetTotalPrice () =
    orderItems |> List.sumBy (fun item -> item.TotalPrice())
-- cgit v1.2.3