Yii的2 ActiveDataProvider：額外的字段或做對數據提供程序

Question

我試圖在ActiveDataProvider添加新的領域或平衡計算的列（transactionSearch.php模型）查詢

時候當我做這個平衡計算的列SQL到phpmyAdmin，它完美的作品。我從stackoverflow研究中得到了這段代碼。由於

SET @bal = 0; 
SELECT t.* , @bal:=t.amount+@bal AS balance 
FROM(
    SELECT * 
    FROM transaction 
    WHERE user_id = 1 
) t 

但是，當我試圖融入transactionSearch.php模型

$query = Transaction::find(); 
$dataProvider = new ActiveDataProvider([ 
    'query' => $query 
]); 

這是我做過什麼

// since I need to prepare query before starting the ActiveDataProvider query, I did this 
$connectionz = Yii::$app->getDb(); 
$query = $connectionz->createCommand("SET @bal = 0"); 
$query = $query->query(); 
// then I run the usual query 
$query = Transaction::findBySql(' 
         SELECT t.* , @bal:=t.amount+@bal AS balance 
         FROM(
          SELECT * 
          FROM transaction 
          WHERE user_id = 1 
         ) t ')->all(); 
$dataProvider = new ActiveDataProvider([ 
    'query' => $query 
]); 

在attributeLabel & 規則除了加入平衡，我也加了Transaction.php模型的setter和getter，但是我一個m 不是肯定是對的還是我缺添加任何規則？

public function setBalance($balance) 
{ 
    $this->balance = (float) $balance; 
} 

public function getBalance() 
{ 
    return ''; 
} 

但它出來錯誤Call to a member function andFilterWhere() on array

任何建議，將好心讚賞

Answer 1

因此，解決辦法是

這是在TransactionSearch.php型號：

$expression = new Expression('@bal:=t.amount+@bal'); 
$connectionz = Yii::$app->getDb(); 
$query = $connectionz->createCommand("SET @bal = 0"); 
$query = $query->query(); 
$query = Transaction::find() 
      ->from(['t' => '(
          SELECT * 
          FROM transaction 
          WHERE user_id = 1) 
       ']) 
      ->select(['t.*','balance' => $expression]) 
      ->orderBy('date'); 
$dataProvider = new ActiveDataProvider([ 
    'query' => $query 
]); 

Transaction.php模型，不需要添加setter或getter，只增加：

public $balance; 

在index.php @事務的文件夾，@的GridView控件 '列' 增加

'balance:currency:Balance', 

就是這樣。

Answer 2

1）使用的SqlDataProvider

$connectionz = Yii::$app->getDb(); 
$query = $connectionz->createCommand("SET @bal = 0"); 
$query = $query->query(); 
$query = Transaction::findBySql(' 
         SELECT t.* , @bal:=t.amount+@bal AS balance 
         FROM(
          SELECT * 
          FROM transaction 
          WHERE user_id = 1 
         ) t '); 
$dataProvider = new SqlDataProvider([ 
    'query' => $query 
]); 

或

2）添加公共財產的平衡交易類。然後，在SQL：

$connectionz = Yii::$app->getDb(); 
$query = $connectionz->createCommand("SET @bal = 0"); 
$query = $query->query(); 
$query = Transaction::find()->where(your condition here) 
->select([transaction.*,'balance'=>' @bal:=t.amount+@bal']) 
$dataProvider = new ActiveDataProvider([ 
    'query' => $query 
]); 

然後你可以使用它像：

$model->balance