系统模型类:model.class.php
数据模型类的位置：/phpcms/libs/classes
phpcms v9二次开发中，我们要经常需要对模块的数据表进行查询、添加、修改和删除数据等操作，所有这些操作都离不开数据模型类model.class.php，它起到开发者与数据表的交互作用。model.class.php里面封装了许多数据表操作的方法，基本上常用的mysql操作语句都能从中找到，但是它又和原生态的mysql语句有所不同，和其它PHP内容管理系统一样，PHPCMS也对原生态的mysql语句进行封装简化，以使它操作起更加方便，为开发者省去了不少麻烦。具体我们来看一下model.class.php代码片断：
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