如何計算行用SELECT COUNT（*）

Question

我試着用倍數參數，以獲得使用SELECT COUNT（*）的行數，它編碼的JSON格式的數字，但我得到這個：

{"notification":[{"count(*)":0}],"message":[{"count(*)":0}]} 

相反的除外：

{"notification":0,"message":0} 

有頁面，這裏的代碼：

session_start(); 
require_once __DIR__ . '/mysql/Db.class.php'; 
$bdd = new Db(); 
$t = array(); 

$query = $bdd->query("SELECT count(*) FROM notification WHERE id_proprio = :id_proprio AND readed = :readed", array("id_proprio"=> $_SESSION['userid'],"readed"=>"0")); 
$query_2 = $bdd->query("SELECT count(*) FROM discussion WHERE id_1 = :uid AND readed = :readed AND notifPour = :uid2 OR id_2 = :uid3 AND readed = :readed2 AND notifPour = :uid4", array(
    "uid"=> $_SESSION['userid'], 
    "readed"=>"0", 
    "uid2"=> $_SESSION['userid'], 
    "uid3"=> $_SESSION['userid'], 
    "readed2"=>"0", 
    "uid4"=> $_SESSION['userid'] 
)); 


$t["notification"] = $query; 
$t["message"] = $query_2; 

echo json_encode($t); 

包括類d的一部分B：

public function query($query,$params = null,$fetchmode = PDO::FETCH_ASSOC) 
{ 
    $query = trim($query); 

    $this->Init($query,$params); // INIT IS THE CONNECTION TO DB 

    if (stripos($query, 'select') === 0) { 
     return $this->sQuery->fetchAll($fetchmode); 
    } 
    elseif (stripos($query, 'insert') === 0 || stripos($query, 'update') === 0 || stripos($query, 'delete') === 0) { 
    return $this->sQuery->rowCount(); 
    } else { 
     return NULL; 
    } 
} 

如何，我可以得到例外的結果格式是這樣的：

{"notification":0,"message":0} 

謝謝。

Answer 1

您的MySQL API返回所有行的數組，每行都是一個關聯數組，其關鍵字是SELECT子句中的標籤。你需要從陣列中提取值：

$t["notification"] = $query[0]['count(*)']; 
$t["message"] = $query_2[0]['count(*)']; 

Answer 2

修改您的SQL查詢來開始：

SELECT count(*) AS cnt FROM 

然後取出從查詢中值，例如：

$t["notification"] = $query[0]["cnt"]; 
$t["message"] = $query2[0]["cnt"];