ThinkPHP learning note instantiation model four methods

Create Action Class [php] & lt ;? PhpclassNewObjectActionextendsAction {publicfunctionindex () {// 1. create a basic model //// 1: instantiate the database operation class of a system /// newModel (& amp ;... "/> create an Action Class [php] Select (); // dump ($ list); // Two: Cross-model operation; instantiate a table, at the same time, instantiate a self-written database operation class // mostly used to extract some public business logic to form a public Model ///M ('user', 'commonmodel ') 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. // multiple models are used for businesses that do not need to be more complex. // 1. create a model manually and create a custom model for the user table, which can encapsulate the functions provided by thinkphp. // $ user = new UserModel () If the model does not exist in D ('user'); // if the model does not exist, an exception is thrown and only one instance is used. the default value is, 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 the table prefix // $ user = new Model (); $ list = $ user-> query ('select * from tb_user '); dump ($ list); // group: D ('admin. user ') ;}}?> Two models: [php] [Php]