YII框架数据库配置说明：

数据库配置位置：config > db.php

db.php详细代码：

<?php

return [
    'class' => 'yii\db\Connection',
    'dsn' => 'mysql:host=localhost;dbname=yiistudy',
    'username' => 'root',
    'password' => 'root',
    'charset' => 'utf8',

    // Schema cache options (for production environment)
    //'enableSchemaCache' => true,
    //'schemaCacheDuration' => 60,
    //'schemaCache' => 'cache',
];

代码说明：