2021-05-07 01:57:16 +08:00
|
|
|
---
|
|
|
|
|
layout: pattern
|
|
|
|
|
title: Data Mapper
|
|
|
|
|
folder: data-mapper
|
|
|
|
|
permalink: /patterns/data-mapper/
|
|
|
|
|
categories: Architectural
|
2021-08-01 22:55:54 +08:00
|
|
|
language: zh
|
2021-05-07 01:57:16 +08:00
|
|
|
tags:
|
|
|
|
|
- Decoupling
|
|
|
|
|
---
|
|
|
|
|
|
|
|
|
|
## 含义
|
|
|
|
|
一个用于在持久化对象和数据库之间传输数据的映射器，同时保持它们之间和映射器本身的独立性。
|
|
|
|
|
|
|
|
|
|
## 类图
|
2021-08-01 22:55:54 +08:00
|
|
|
|
2021-05-07 01:57:16 +08:00
|
|
|
|
|
|
|
|
## 适用场景
|
|
|
|
|
数据映射器适用于以下场景：
|
|
|
|
|
|
|
|
|
|
* 当你想把数据对象从数据库访问层解耦时时
|
|
|
|
|
* 当你想编写多个数据查询/持久化实现时
|
|
|
|
|
|
|
|
|
|
## 引用
|
|
|
|
|
|
|
|
|
|
* [Data Mapper](http://richard.jp.leguen.ca/tutoring/soen343-f2010/tutorials/implementing-data-mapper/)
|
