Yii2 migrations. Percentage sign and brackets in table name

问题

I browsed the yii2-oauth2-server code on github and encountered interesting syntax in the migration file. The code in question looks like this:

    $this->createTable('{{%oauth_clients}}', [
        ...
    ], $tableOptions);

Can someone explain the {{%oauth_clients}} part? What does it mean when the table name is enclosed in {{%..}}? The official documentation on migrations says nothing about it and all examples have the "raw" table names like this:

    $this->createTable('post_tag', [
        ...
    ]);

I checked my database and the table was created as if there were no brackets, its name is simply oauth_clients.

回答1:

Is used for table prefix

From yii2 documentation on Db connection:

If a table name is given as {{%TableName}}, then the percentage character % will be replaced with this property value. For example, {{%post}} becomes {{tbl_post}}.

来源：https://stackoverflow.com/questions/38698129/yii2-migrations-percentage-sign-and-brackets-in-table-name