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Yii 数据库访问、查询生成器和活动记录三者的关系 #1

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git-zjx opened this issue Jun 18, 2019 · 0 comments
Open

Yii 数据库访问、查询生成器和活动记录三者的关系 #1

git-zjx opened this issue Jun 18, 2019 · 0 comments
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git-zjx commented Jun 18, 2019

简介

数据库访问 DAO 为不同的数据库提供了一套统一的API
查询生成器 QueryBuilder 用于创建动态的查询语句
活动记录 ActiveRecord 提供了数据库与模型(MVC 中的 M,Model) 的交互

关系

查询生成器建立在 数据库访问 DAO 基础之上，可让你创建 程序化的、DBMS无关的SQL语句
yii\db\ActiveRecord::find() 创建的 查询生成器对象 yii\db\ActiveQuery 继承自 yii\db\Query 查询生成器，所以查询生成器的所有方法活动记录 ActiveRecord 都可以用
@git-zjx git-zjx added Tips Tips Yii Yii labels Jun 18, 2019
@git-zjx git-zjx self-assigned this Mar 2, 2020
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