Introduction to the multi-layer MVC support in the new features of ThinkPHP3.1

This article mainly introduces the support of multi-layer MVC in the new features of ThinkPHP3.1. It has a certain reference value. Now I share it with you. Friends in need can refer to it

Default The model layer consists of Model classes. However, as the project grows and the business system becomes more complex, it is difficult for a single model layer to meet the requirements. Multi-layer Model support has been launched since 3.1. This article mainly introduces the support of ThinkPHP3.1 multi-layer MVC. Friends who need it can refer to

1. Model (Model) layer: The default model layer is composed of the Model class. However, as the project grows and the business system becomes more complex, it is difficult for a single model layer to meet the requirements. Multi-layer Model support has been launched since 3.1. The design idea is very simple. Different model layers still inherit from the system’s Model class. , but distinctions are made in the directory structure and naming conventions. For example, in a certain project design, it is necessary to distinguish between different model layers such as data layer, logic layer, and service layer. We can create Model, Logic, and Service under the Lib directory of the project. Directory, all model operations on user tables are divided into three layers:

Data layer: Model/UserModel is used to define data-related automatic verification and automatic completion and data access interfaces
Logic layer: Logic/UserLogic is used to define user-related business logic
Service layer: Service/UserService is used to define user-related service interfaces, etc.

These three model operation classes can all inherit the Model class, so that the operation of user data is very clear. When calling, you can also use the built-in D method to conveniently call:

D('User') //实例化UserModel
D('User','Logic') //实例化UserLogic
D('User','Service') //实例化UserService

The hierarchical division of model layers is very flexible, and developers can freely define hierarchies according to the needs of the project.

2. View layer: is composed of a template and a template engine. PHP code can be used directly in the template. The design of the template engine will be described later, and it can also be supported through the driver. Other third-party template engines. Multiple layers of views can be simply distinguished by directories, for example:

Tpl/default/User/add.html
Tpl/blue/User/add.html

##3. Controller layer: ThinkPHP control The controller layer consists of a core controller and a business controller. The core controller is completed by the App class inside the system and is responsible for the scheduling control of applications (including modules and operations), including HTTP request interception and forwarding, loading configuration, etc. The business controller is Completed by user-defined Action class. Version 3.1 has added support for multi-layer service controllers. Its implementation principle is similar to the layering of models, such as business controllers and event controllers:

Action/UserAction //用于用户的业务逻辑控制和调度
Event/UserEvent //用于用户的事件响应操作

 A('User','Event');

At the same time, the R method can also support the calling of multi-layer controllers. A third parameter is added to indicate the layer name of the controller, for example:

R('User/register',array(15),'Event');

In the three layers of MVC,
ThinkPHP does not depend on M or V, and can even only have C or only V. This is The design of ThinkPHP is a very important user experience design. Users only need to define the view, and it can be automatically recognized without C.

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