How to make the primary key automatically increase in Yii

Articles generally have a need to count the number of views. Generally, the approach for small projects is to directly update a field in the database. How to implement this in Yii? Please read below

How to automatically increase the primary key in yii

Method 1

Yii2 has this updateAllCounters static method. This method is the fastest and most trouble-free implementation. The code example is as follows:

Topic::updateAllCounters(['view_count' => 1], ['id' => $id]);// 实现的效果就是 view_count + 1，1根据你的需求可以是正数也可以是负数。

If your conditions are more complex, you can write like this: (Related tutorials recommend: yii Framework)

Topic::updateAllCounters(['view_count' => 1], ['and', ['xxx' => 0, 'yyy' => 2], ['>', 'zzz', $time]);

If your current need is to update the value of a field and the value of a field is 1, you can try to implement it in this way:

Topic::updateAll(
    ['view_count' => new Expression('`view_count` + 1'), 'updated_at' => time()],
    ['id' => $id]
);

PS: Remember that the default value of the view_count field here cannot be set to null.

Expression means expression, which can implement more special SQL. If you want to know more, you can search the documentation.

Method 2

当然你还可以这样去实现：
$model = Post::findOne($id);
$model->updateCounters(['view_count' => 1]);

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