Yii2的数据库操作总结

1.原生sql语句执行

//执行命令

Yii::$app->db->createCommand("SET time_zone = 'UTC'")->execute();

//返回数据格式[[‘name’=>”,’age’=>”],[‘name’=>”,’age’=>”]]

Yii::$app->db->createCommand('SELECT * FROM post')->queryAll();

//返回格式[‘name’=>”,’age’=>”]

Yii::$app->db->createCommand('SELECT * FROM post WHERE id=1')->queryOne();

//返回格式[‘a’,’b’,’c’]

Yii::$app->db->createCommand('SELECT title FROM post')->queryColumn();

//返回格式value

Yii::$app->db->createCommand('SELECT COUNT(*) FROM post')->queryScalar();

//绑定参数

Yii::$app->db->createCommand('SELECT * FROM post WHERE id=:id AND status=:status') ->bindValue(':id', $_GET['id']) ->bindValue(':status', 1) ->queryOne();

$params = [':id' => $_GET['id'], ':status' => 1];
$post = Yii::$app->db->createCommand('SELECT * FROM post WHERE id=:id AND status=:status') ->bindValues($params) ->queryOne();

$post = Yii::$app->db->createCommand('SELECT * FROM post WHERE id=:id AND status=:status', $params)->queryOne();

$command = Yii::$app->db->createCommand('SELECT * FROM post WHERE id=:id');
$post1 = $command->bindValue(':id', 1)->queryOne();
$post2 = $command->bindValue(':id', 2)->queryOne();