<?php  User::find()->one();//返回單行資料

User::find()->all();//返回多行資料

User::find()->count();//統計行數

User::find()->average();//統計平均數

User::find()->max();

User::find()->scalar();

User::find()->column();

User::find()->exists();

User::find()->batch(10);

User::find()->each();

User::find()->findByPk(1);

User::find()->findAllBySql('select * from user');

$data = (new Query)

        ->select('*')//查詢什麼欄位

        ->from('user')//查詢什麼表

        ->join('LEFT JOIN','orders','user.id = order.user_id')//外連線

        ->where(['status'=>1,'user_id'=>1])//條件

        ->offset(5)//跳過幾條

        ->limit(10)//查詢幾條

        ->all()

直接查詢

$sql = 'select user_id,name,account from user where user_id>10';

$rows = Yii::$app->db->createCommand($sql)->query();//

$rows = Yii::$app->db->createCommand($sql)->queryAll();

$row  = Yii::$app->db->createCommand($sql)->queryOne();
 

關聯查詢

/**

*客戶表，訂單表，國家表

*user     order  country

*/    

class UserModel extends yii\db\ActiveRecord{

    //客戶與訂單的關係是：一對多

    public function getOrder(){
        return  $this->hasMany(OrderModel::className(),['user_id'=>'id']);

     }

      //客戶與國家的關係：一對一

    public function getCountry(){    

        return $this->hasOne(CountryModel::className(),['id'=>'country_id])

    }

}

//查詢客戶他們訂單與國家的所有資訊 

UserModel::find()->with('order','country')->all()

  UserModel::find()->with('order.address')->all();

增加

$user = new User;

$user->username = $username;

$user->password  = $password;

$user->save();

批量增加

Yii::$app->db->createCommand->batchInsert('user',[

    ['test1',30],

    ['test2',20],

    ['test3',15]

])->execute();
 

修改

$user = User::find()->where(['name'=>'test'])->one();

$user->age = 40;

$user->save();

直接修改:修改test使用者的age為40

$result = User::model->updateAll(['age'=>40],['name'=>'test']);

使用createCommand修改

Yii::$app->db->createCommand()->update('user',['age'=>40],'name=test')->execute();

刪除 

使用model::delete()刪除

$user = User::find()->where()->one();

$user ->delete();

直接刪除：年齡為30的所有使用者

$result = User::deleteAll(['age'=>'30']);

根據主鍵刪除：

$result = USer::deleteByPk(1);

Yii::$app->db->createCommand()->delete('user','age'=>30)->execute();