thinkphp5 how to update unchanged data to 0

ThinkPHP 5 is an open source PHP framework that can significantly improve the efficiency of web application development. Among them, operations involving data query, insertion, update, deletion and other operations are one of the most frequently used parts. This article will explore how to update data that does not need to be updated to 0 when using the ThinkPHP 5 framework.

It is very convenient to use ORM object relational mapping to operate data in ThinkPHP 5. Normally, we use the save() method of the model object to update the data. When using the save() method, if a field in the form has not been modified, the value of the field will not be updated.

For example, we have a user information table that covers details such as the user's ID, username, password, gender, and age. The user only modified the password and age fields; no changes were made to the username and gender fields. The save() method does not change the value of the username and gender fields when performing an update operation. But if we want to update the unchanged data to 0, how do we do it?

We can achieve this function by overriding the save() method of the model object. The specific implementation is as follows:

1. In the model class, define a static array $zero_fields to store the field array that needs to be updated to 0.

protected static $zero_fields = ['field1', 'field2', ...];

2. In the save() method, determine whether the field that needs to be updated to 0 already has a value. If not, update its value to 0, and finally call the save() method of the parent class. Update other fields.

public function save(array $data = [], $where = [], $sequence = null)
{
    foreach (self::$zero_fields as $field) {
        if (!isset($data[$field])) {
            $data[$field] = 0;
        }
    }
    return parent::save($data, $where, $sequence);
}

By rewriting the save() method, we can process the fields that need to be updated in a targeted manner and update the unchanged fields to 0, avoiding the impact of incomplete data submitted by the form on the database. .

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