How to delete functions in thinkphp (two methods)

ThinkPHP is a PHP development framework that is widely used in the field of Web development. It provides many convenient functions to assist developers in quickly developing applications. For many applications, the delete function is one of the basic functions. This article will introduce how to implement the delete function in ThinkPHP.

1. What is the delete function?

The delete function means that in an application, the user can delete a data record. Within an application, a user can delete one or more data records by performing a delete operation. This is a very basic feature as it is used in many applications such as blogging, social media, e-commerce, etc.

2. How to use ThinkPHP to implement the deletion function?

In ThinkPHP, there are several methods to achieve the deletion function. Here we will introduce two of them.

1. Delete method using model

The model is a tool for interacting with the database. The model contains the basic operations of data records, such as query, insert, update and delete wait. In ThinkPHP, models can directly inherit the Think\Model class for operation.

Deletion operations are easily accomplished using the delete method in the model. For example, assuming we have a user model called UserModel, and we want to delete the user record with ID 1, we can use the following code:

$userModel = new UserModel();
$userModel->where('id=1')->delete();

In the above example, we first created a user model named $userModel instance, then use the where method to specify the data to be deleted, and finally use the delete method to perform the delete operation.

2. Using the delete method of the controller

The controller is the module in the application that handles web requests and responses. In ThinkPHP, controllers can directly inherit the Think\Controller class to perform operations.

To implement the delete function in the controller, you can use the following code:

public function delete($id)
{
    $userModel = new UserModel();
    $userModel->where('id='.$id)->delete();
    $this->success('删除成功');
}

In the above example, we created a method named delete, which receives a parameter $id (ID of the record to be deleted). We then use the same logic to get the user model and perform the delete operation, and finally use the $this->success method to return a success message.

It should be noted that the controller method can obtain parameters directly from the URL. For example, if we define a parameter $id in the delete method of the controller, then we can access this method through the following URL:

http://example.com/user/delete/id/1

The 1 here is the ID to be deleted.

3. Implement hard deletion and soft deletion of data

In an application, sometimes you need to permanently delete a data record, and sometimes you need to move it to the trash or recycle bin. In ThinkPHP, these operations can be achieved through hard deletion and soft deletion.

Hard deletion refers to permanently deleting data records from the database and cannot be recovered. If the application does not need to retain deleted data, then hard deletion can be used.

Soft deletion means marking the data record as deleted but not deleting it from the database. These deleted data records can be recovered or placed in the Recycle Bin until they are permanently deleted or restored. Soft deletion can be used to save history or prevent accidental operations.

In ThinkPHP, hard deletion and soft deletion can be achieved by setting the properties of the model. For example:

namespace app\admin\model;

use think\Model;
use traits\model\SoftDelete;

class User extends Model
{
    use SoftDelete; // 开启软删除

    protected $deleteTime = 'delete_time'; // 定义软删除字段
    protected $defaultSoftDelete = 0; // 定义软删除字段默认值
}

In the above example, we use the use statement to import traits\model\SoftDelete, and specify the fields used for soft deletion by setting the $deleteTime property, and specify soft deletion by setting the $defaultSoftDelete property. The default value of the field.

When performing a deletion operation, you can implement hard deletion (without using soft deletion) through the following code:

$userModel = new UserModel();
$userModel->where('id=1')->delete(true);

When performing a deletion operation, you can implement soft deletion through the following code (using Soft delete):

$userModel = new UserModel();
$userModel->where('id=1')->delete();

Finally, we need to note that when using soft delete, deleted data records still exist in the database, taking up space. Therefore, deleted data should be cleaned regularly to free up space.

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