GridView::widget([
// ......
'options' => ['class' => 'grid-view','style'=>'overflow:auto', 'id' => 'grid'],
// ......
'columns' => [
// ......
[
'class' => 'yii\grid\CheckboxColumn',
'name' => 'id',
],
// ......
],
]);
$this->registerJs('
$(".gridview").on("click", function () {
var keys = $("#grid").yiiGridView("getSelectedRows");
console.log(keys);
});
');

在controller的beforeAction里面，重新设置db组件呗。

\Yii::$app->set('db', [
    'class' => 'yii\db\Connection',
    'dsn' => 'mysql:host=' . $dbHost . ';dbname=' . $dbName,
    'username' => $dbUser,
    'password' => $dbPassword,
    'charset' => 'utf8',
    'emulatePrepare' => true,
    'tablePrefix' => 'xx_',
]);

其中的$dbHost, $dbName, $dbUser, $dbPassword都是可以动态指定的。