DROP TABLE IF EXISTS `pre_user`;CREATE TABLE `pre_user`(  `id` int(11) AUTO_INCREMENT PRIMARY KEY,  `username` varchar(255) NOT NULL,  `password` varchar(32) NOT NULL DEFAULT '',  `password_hash` varchar(255) NOT NULL DEFAULT '',  `email` varchar(255) NOT NULL DEFAULT '',  `status` smallint(6) NOT NULL DEFAULT 10,  `created_at` smallint(6) NOT NULL DEFAULT 0,  `updated_at` smallint(6) NOT NULL DEFAULT 0)ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

<?phpreturn [  'class' => 'yii/db/Connection',  'dsn' => 'mysql:host=localhost;dbname=yii2',  'username' => 'root',  'password' => 'root',  'charset' => 'utf8mb4',  'tablePrefix' => 'pre_'];

var_dump(/Yii::$app->db);

// 接收表單的數據$username = 'jack';$sql = "INSERT INTO {{%user}} (username,status) VALUES (:username,:status)";// 返回受影響行數$row = /Yii::$app->db->createCommand($sql,['username'=>$username,'status'=>8])->execute();// 獲取自增IDecho /Yii::$app->db->getLastInsertID();

$sql = "SELECT * FROM {{%user}} WHERE id>:id";// 查詢結果是一個二維數組$userArr = /Yii::$app->db->createCommand($sql,['id'=>1])->queryAll();// 如果要查詢一個$user = /Yii::$app->db->createCommand($sql,['id'=>1])->queryOne();// 如果要返回單值// 例如 select count(*)語句$count = /Yii::$app->db->createCommand($sql,['id'=>1])->queryScalar();echo $count;