thinkphp实例化模型给我们提供了三种方法
第一种 比较平常使用
就是$user=new Model(‘user'); //也等于 $user=M(‘user')
第二种就是我们如果有公共模型
我们的使用是这样的
譬如我们新建一个model CommonModel.class.php这个公共模型
我们实例化就是这样的
代码如下:
$user=new CommonModel(‘user');
这样我们既可以实例化user模型 又可以调用公共模型里边的方法
第三种就是针对我们的实例化模型
创建一个model UserModel.class.php
实例化就是这样的$user=new UserModel();
这样就可以了,主要我们的业务逻辑比较多的时候我们这样使用
第四种 为什么会有第四种 空模型
代码如下:
$user= new Model(); //等价于$user=M();
然后我们使用sql语句吧
代码如下:
$list=$user->query(‘select * from wd_user');
D方法的使用时可以自动检测模型类,不存在时,会抛出一个异常,不会重复实例化,只能支持当前项目或者应用的实例化
实例化大约就这么多,继续给大家说说thinkphp的那些事情
总结:
本文介绍的模型定义与实例化偏向于理论,但在后面的开发中,对数据的操作都要用到模型的实例化,可根据项目实际情况采取不同的模型实例化方式。

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