如何在抽象类中使用PDO :: FETCH_CLASS? [英] How to use PDO::FETCH_CLASS with abstract class?

问题描述

是否有一种方法可以基于检索到的数据使用PDO::FETCH_CLASS实例化子类?假设存在一个抽象类A，类B和C，它们是A的实现，并且在我的表中名为classname的字段将用于实例化正确的类.有可能吗?

Is there a method to instantiate a child class with PDO::FETCH_CLASS based on retrieved data? Suppose that there exists an abstract class A, classes B and C that are implementations of A and a field on my table named classname that will be used to instantiate the right class. Is it possible?

推荐答案

您需要的声音，PDO::FETCH_CLASSTYPE. 摘自手册:

PDO :: FETCH_CLASS:返回所请求类的新实例， 将结果集的列映射到 班级.如果fetch_style包含PDO :: FETCH_CLASSTYPE(例如 PDO :: FETCH_CLASS | PDO :: FETCH_CLASSTYPE)，则该类的名称为 由第一列的值确定.

PDO::FETCH_CLASS: returns a new instance of the requested class, mapping the columns of the result set to named properties in the class. If fetch_style includes PDO::FETCH_CLASSTYPE (e.g. PDO::FETCH_CLASS | PDO::FETCH_CLASSTYPE) then the name of the class is determined from a value of the first column.

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