How to update unchanged data to 0 in thinkphp5

ThinkPHP 5 is an open source PHP framework that can greatly 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 discuss how to update unchanged data to 0 when the data is updated using the ThinkPHP 5 framework.

In ThinkPHP 5, it is very convenient to use ORM object relational mapping for data operations. When updating data, we usually use the save() method of the model object to complete the data update operation. However, using the save() method, if a field is not modified in the form, the value of the field will not be updated.

For example, we have a user information table, which contains information such as user ID, user name, password, gender, and age. Now, when the user modifies information, only the password and age fields are modified, while the username and gender fields do not need to be modified. When performing an update operation using the save() method, the username and gender fields will remain unchanged and will not be updated. 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. .

In short, the ThinkPHP 5 framework provides a very convenient way to operate data, which can help developers quickly develop Web applications. When performing data update operations, we can update the unchanged data to 0 by overriding the save() method of the model object. This method avoids the impact of incomplete data submitted by the form on the database, and provides guarantee for the stability of the application.

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