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ThinkPHP study notes four methods of instantiating models_PHP tutorial
- WBOYOriginal
- 2016-07-14 10:08:251028browse
Create Action class
[php]
class NewObjectAction extends Action{
public function index(){
//1. Create a basic model
// //1: Instantiate a system database operation class
// //new Model('User') is equivalent to M('User'), placing a table that needs to be operated on in the Model
// //1 Naming:
// // thinkphp has a table name prefix by default, if it is think_user; you can use User or user to obtain it in the Model
// // If it is think_user_message; then use Model('UserMessage'); uppercase means adding a _ in front of the table name
// $User=new Model('User');
// //Call query method
// $list=$User->select();
// dump($list);
// // 2: Cross-model operation; instantiate a table and instantiate a database operation class written by yourself
//Mostly used to extract some public business logic to form a public Model
// //M('user','CommonModel') is equivalent to new CommonModel('user'); model is automatically loaded
//// $user=M('user','CommonModel');
// $user=new CommonModel('user');
// $list=$user->select();
// dump($list);
// $user->modelTest();
//Three: Instantiate a user-defined model
//Mostly used for businesses that do not require more complexity
//1. Manually create a model and create a custom model for the user table, which can encapsulate the functions provided by thinkphp
//$user=new UserModel() is equivalent to D('user');
//D method will throw an exception if the model does not exist, and will only instance one instance. By default, it only supports calling the model under the current application
// $user=new UserModel();
// $list=$user->select();
// dump($list);
// $user->modelTest();
//4. Instantiate an empty model; it is the way of traditional sql statement; table prefix needs to be added
//
$user=new Model();
$list=$user->query('select * from tb_user');
dump($list);
//Group: D('admin.user');
}
}
?>
Two models:
[php]
class CommonModel extends Model{
function modelTest(){
Echo 'test cross -model operation, call the method in the model';
} }
}
?>
[php]
class UserModel extends Model{
function modelTest(){
Echo 'test cross -model operation, call the method in the model';
} }
}
?>
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