Discuss how to use ThinkPHP to perform add, delete, modify and query operations

ThinkPHP is an open source framework based on PHP. It simplifies the development process, improves code reusability and maintainability, and also provides a variety of database operation methods, including add, delete, modify (CRUD) operations.

In this article, we will explore how to use ThinkPHP to perform add, delete, modify and query operations.

Add data

Add data refers to adding new data to the database. There are many ways to add data using ThinkPHP, the most commonly used of which is to use the model mode or the associated model mode.

Model mode refers to defining a model class in the application, which can use the database operation methods improved by ThinkPHP to manage the database. The following is an example of using the model class to add data:

use app\model\User;

$user = new User();
$user->name = 'John';
$user->email = 'john@example.com';
$user->save();

The above code uses the User model class to manage the database, then creates a user named John and saves it to the database.

Associated model refers to defining an associated model class in the application, which can use multiple model classes to manage the database. The following is an example of using the associated model class to add data:

use app\model\User;
use app\model\Profile;

$user = new User();
$user->name = 'John';
$user->email = 'john@example.com';

$profile = new Profile();
$profile->gender = 'Male';
$profile->address = '123 Main Street';

$user->profile = $profile;
$user->save();

The above code uses the User model class and Profile model class to manage the database, and then creates a user named John and his corresponding information, and Save them to the database.

Deleting data

Deleting data means deleting records from the database. The most common way to delete data using ThinkPHP is to use the delete() method of the model class. The following is an example of using the model class to delete data:

use app\model\User;

User::where('id', 1)->delete();

The above code uses the User model class to manage the database and deletes the user record with ID 1.

Change data

Modification of data refers to modifying the records in the database. The most common way to modify data using ThinkPHP is to use the save() method of the model class. The following is an example of using a model class to modify data:

use app\model\User;

$user = User::find(1);
$user->name = 'John Smith';
$user->email = 'john.smith@example.com';
$user->save();

The above code uses the User model class to manage the database and find the user record with ID 1, then modify its name and email, and add it Save to database.

Query data

Querying data refers to obtaining records from the database. The most common way to use ThinkPHP to perform data query operations is to use the find() and select() methods of the model class. The following is an example of using the model class to query data:

use app\model\User;

$user = User::find(1);
echo $user->name;
echo $user->email;

$users = User::select();
foreach ($users as $user) {
    echo $user->name;
    echo $user->email;
}

The above code uses the User model class to manage the database, finds the user record with ID 1, and outputs the user's name and email. Then use the select() method to get all the user records and output their names and emails through a loop.

Conclusion

This article introduces how to use ThinkPHP to perform add, delete, modify and query operations, including using model mode and associated model mode. These operations are one of the basic operations of web application development, and mastering these operations is very important for developing high-quality web applications.

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