How to implement logical deletion in thinkphp (steps)

ThinkPHP Tombstone: What is tombstone and how to use it?

In a web application, data management and maintenance is very difficult. Especially when it comes to deleting data, the problem can become even more complicated. The most common scenario is that in most applications, when a user deletes a record, it is permanently deleted and cannot be recovered. However, sometimes it is necessary to retain some information about this record, such as the reason for deletion or the identity of the deleter, etc. At this time, you need to use logical deletion.

In the ThinkPHP framework, logical deletion is implemented through a mark field. When a record is deleted, the mark field is set to a specific value, such as 0, indicating that the record has been deleted. This way, even if the record is no longer visible in the application, its existence is still maintained. This mark field is usually added in the database table to store whether the record has been deleted.

So, how to use logical deletion in ThinkPHP? The following are the steps to implement logical deletion:

1. Add a mark field in the database table to store whether the record has been deleted.
2. Add a delete method in the model to set the mark field value of the record and update the corresponding record in the database table. For example:

public function delete($id) {
    $data['id'] = $id;
    $data['is_deleted'] = 0;
    $this->save($data);
}

3. When querying data, use the where method to filter out records that have not been deleted. For example:

$data = $model->where('is_deleted', '=', 0)->select();

Through the above steps, you can achieve logical deletion. However, it is important to note that tombstones are not true deletions. Therefore, when you query data, you need to add the is_deleted condition in the where method to prevent deleted records from being mistaken for existence.

Summary:

Logical deletion is very useful for maintaining and managing data. Using tombstones is a good option when you need to retain some information about a record without deleting it. In ThinkPHP, logical deletion is very easy to implement. You only need to add a mark field and add a delete method to the model.

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