ThinkPHP four methods for learning the note instantiation model _ PHP Tutorial

ThinkPHP provides four methods for learning the note instantiation model. Create Action Class [php]? PhpclassNewObjectActionextendsAction {publicfunctionindex () {1. create a basic model 1: instantiate a system database operation class new Create Action Class

[Php]

Class NewObjectAction extends Action {

Public function index (){

// 1. create a basic model

/// 1: instantiate the database operation class of a system

/// New Model ('user') is equivalent to M ('user'), and a table to be operated is placed in the Model.

/// 1 name:

/// Thinkphp has the table name prefix by default. if it is think_user, you can use User or user in the Model to obtain the table name prefix.

/// If think_user_message is used, Model ('usermessage') is used. in uppercase, _

// $ User = new Model ('user ');

/// Call the query method

// $ List = $ User-> select ();

// Dump ($ list );

/// 2: Cross-model operations. instantiate a table and a self-written database operation class.

// 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 ();

// 3. instantiate a user-defined model

// Mostly used for businesses that do not require more complex services

// 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 ');

// Method D if the model does not exist, an exception is thrown and only one instance is used. by default, only models under the current application can be called.

// $ User = new UserModel ();

// $ List = $ user-> select ();

// Dump ($ list );

// $ User-> modelTest ();

// 4. instantiate an empty model. it is a traditional SQL statement. you need to add a table prefix.

//

$ 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 operations and call methods in the model ';

}

}

?>

[Php]

Class UserModel extends Model {

Function modelTest (){

Echo 'test cross-model operations and call methods in the model ';

}

}

?>

Why [php]? Php class NewObjectAction extends Action {public function index () {// 1. create a basic model // 1: instantiate the database operation class of a system /// new...