What to write in thinkphp m layer

ThinkPHP is a popular PHP open source framework. It adopts the MVC design pattern and divides the application into three layers: model, view and controller. Among them, the model layer (M) is an important layer responsible for processing business logic and data storage. Therefore, during the development process, many developers have some questions about the writing of the M layer. This article will discuss this aspect.

1. The role of the M layer

In the MVC model, the role of the M layer is to handle data storage and business logic. In an application, the M layer is usually responsible for completing the following tasks:

1. Bind business logic to the data model: The M layer can convert the tables in the database into a data model and bind the business logic to the data model. fixed on these models. In this way, when the business logic changes, you only need to modify the model, which greatly improves the reusability and maintainability of the code.
2. Data verification: The M layer can verify the data to ensure the legality and correctness of the data. If the data does not comply with the regulations, the M layer can prevent it from entering the database and feedback error information to the user.
3. Data filtering: The M layer can also filter data to prevent malicious users from attacking and injecting operations into the database.
4. Data access: The M layer provides access and operation interfaces to the database. Developers can use the M layer interface to access the database without directly operating the database, which ensures the security and stability of the code.

2. Writing specifications for the M layer

For writing the M layer, there are generally the following specifications:

1. Follow the single responsibility principle: M The layer should only be responsible for data storage and business logic processing, and should not involve any logic code related to controllers and views.
2. Selection of database driver: The M layer needs to interact with the data storage system, so developers need to choose the database type of the website, such as MySQL, SQLite, etc., and use the corresponding database driver.
3. Separate logical code and database operations: Logical code and database operations should be separated in the M layer, making them clearer and easier to write and maintain.
4. Use the ORM framework: ORM (Object Relational Mapping) is a technology that maps objects to data in a relational database. It allows programmers to use an object-oriented approach to database operations, which makes the M layer Writing is easier and more flexible.
5. Reasonable use of cache: When the M layer performs data operations, it needs to consider the performance of data operations. Reasonable use of cache can improve the response speed of the program.

3. Implementation methods of M layer

The implementation methods of M layer include the following:

1. Data storage and implementation are realized by manually writing SQL statements access operations.
2. Use PHP's native PDO extension library to implement.
3. Use a mature ORM framework, such as the ORM framework (Active Record) in the ThinkPHP framework.
4. Use other third-party ORM frameworks, such as Doctrine, Propel, etc.

In actual projects, using the ORM framework is a more common way. Using the ORM framework can avoid dealing with the database directly. Developers only need to make some simple configurations to get a complete ORM layer, which greatly shortens the development cycle and improves the maintainability of the code.

4. Summary

In the MVC model, the M layer is the most important layer in the entire model. It provides data storage and business logic processing for applications. During the writing process of the M layer, the single responsibility principle should be followed, the logical code and database operations should be separated, and the ORM framework should be used. This can make the writing of the M layer clearer, more flexible, and easier to maintain.

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