How to use thinkphp field mapping

With the rapid development of the Internet and mobile Internet, the development of Web applications has become one of the main tasks of the new generation of developers. As one of the most popular development languages ​​currently, PHP has a wide range of applications in the field of application development. As an open source framework for PHP, ThinkPHP has also become one of the first choices for web developers.

During the development process, we often need to map fields in the database to our applications. At this time, we need to use ThinkPHP's field mapping function to map database fields to properties or methods in the application. This article will introduce you to the use of ThinkPHP field mapping in detail.

1. Basic concepts

First, we need to understand some basic concepts. In ThinkPHP, there are the following three common field mapping methods:

(1) Attribute mapping: Map fields in the database into attributes of a class, for example:

protected $name = 'user_name';

(2) Method mapping: mapping fields in the database to methods of a class, for example:

public function getNameAttr($value)
{
    return strtoupper($value);
}

public function getName($value)
{
    return strtolower($value);
}

(3) Automatic mapping: mapping fields in the database to attributes of a class in the form of attribute names or method names or Methods, for example:

protected $auto = ['name'];

Among them, attribute mapping and method mapping need to be manually defined, while automatic mapping does not need to be manually defined.

2. Attribute mapping

In ThinkPHP, we can use attribute mapping to map fields in the database into attributes of a class. For example, we have a user table with a field user_name. We can map it to an attribute of a class:

protected $name = 'user_name';

In this way, we can directly use $this->name in our program. Access the user_name field in the database.

It should be noted that attribute mapping can only map fields in the database to attributes of a class, and cannot implement more complex logic, such as formatting data.

3. Method mapping

Method mapping is a method that maps fields in the database into a class. The method name is generally getFieldAttr, where Field is the field name in the database, and Attr means mapping the field into an attribute. For example, we have a user table with a field user_name, which we can map to a class method:

public function getNameAttr($value)
{
    return strtoupper($value);
}

In this method, the first parameter $value represents the value of the field in the database , in our program we can call this method through $this->name and obtain the formatted field value.

It should be noted that method mapping can only map fields in the database to methods of a class, and cannot implement more complex logic, such as formatting data, etc.

4. Automatic mapping

Automatic mapping is to map fields in the database to attributes or methods of a class in the form of attribute names or method names. For example, we have a user table with a field user_name. We can define the following attributes in the class:

protected $auto = ['name'];

In this way, we can access the database through $this->name in our program The user_name field is gone.

It should be noted that automatic mapping can only map fields in the database to attributes or methods of a class, and the implementation logic is relatively simple. If you need to implement more complex logic, it is recommended to use attribute mapping or method mapping.

5. Summary

The above is the basic method of using ThinkPHP field mapping. In practical applications, we can choose the required field mapping method according to specific needs. Attribute mapping can map fields in the database into attributes of a class, which is suitable for simple data mapping; method mapping can map fields in the database into methods of a class, which is suitable for data mapping that requires complex logic such as formatting; automatically Mapping can automatically map fields in the database to attributes or methods of a class based on attribute names or method names, and is suitable for situations where data mapping is relatively simple.

In short, using ThinkPHP's field mapping function can greatly simplify the developer's development process and improve development efficiency.

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