Yii2 프레임워크는 일반적인 데이터베이스 작업 분석을 구현합니다.

use yii\db\Query;
$query = new Query();

$rows = (new \yii\db\Query())
      ->select(['code', 'name', 'population'])
      ->from('country')
      ->limit(10)
      ->all();

$data = $query->select(['code', 'name'])->from('country')->all();

// 调用 yii\db\Query::addSelect() 方法来选取附加字段
    $data = $query->select(['code', 'name'])
      ->addSelect(['population'])->all();

$query->from('country'); 
$query->from(['public.country c']); 
$query->from('public.country c');

andFilterWhere()

orFilterWhere()

$country->name = 'UK';
$country->save();

$country = Customer::findOne($id);
$country->email = 'UK';
$country->save(); // 等同于 $country->update();