致命錯誤：未知的異常'PDOException'消息'SQLSTATE [HY000]：一般錯誤'.. C：\ xampp \ .. PDOStatement-> fetch（）.. on line 83

Question

我實際上看到過類似的問題「致命錯誤：未捕獲異常'PDOException'」。但是我看不到能解決我所面臨的挑戰。

下面的代碼和錯誤消息

<?php 
$sql5 = " set @rownum := 0; 
set @sum := 0; 

select DISTINCT(ROUND(the_avg,4)) 
FROM (
    select water_level, 
@rownum := (@rownum + 1) as rownum, 
@sum := IF(@rownum mod 7 = 1,0 + water_level,@sum + water_level) as running_sum, 
IF(@rownum mod 7 = 0,@sum/7,NULL) as the_avg 
FROM " .$table." WHERE record_month_year = '".$startDateReport."' 
order by id ASC 
) s "; 
$result5 = $db->prepare($sql5); 
$result5->execute(); 
while ($rowReport = $result5->fetch(PDO::FETCH_ASSOC)) { 
    ?> 
    <tr style="font-size:11px;"> 
     <td><?php echo $rowReport['the_avg'] ; ?></td> 
     </tr> 
     <?php 
     } 
     ?> 

線83：

while ($rowReport = $result5->fetch(PDO::FETCH_ASSOC)) { 

錯誤：

Fatal error: Uncaught exception 'PDOException' with message 'SQLSTATE[HY000]: General error' in C:\xampp\htdocs\awos\includes\loadboreholedatareport.php:83 Stack trace: #0 C:\xampp\htdocs\awos\includes\loadboreholedatareport.php(83): PDOStatement->fetch() #1 C:\xampp\htdocs\awos\borData-report.php(46): include('C:\xampp\htdocs...') #2 {main} thrown in C:\xampp\htdocs\awos\includes\loadboreholedatareport.php on line 83.

Answer 1

您只能在與PDO一次做一個查詢..分開做，像這樣..

$db->query("set @rownum := 0"); 
    $db->query("set @sum := 0"); 
    $sql5 = "select DISTINCT(ROUND(the_avg,4)) 
    FROM (
     select water_level, 
    @rownum := (@rownum + 1) as rownum, 
    @sum := IF(@rownum mod 7 = 1,0 + water_level,@sum + water_level) as running_sum, 
    IF(@rownum mod 7 = 0,@sum/7,NULL) as the_avg 
    FROM " .$table." WHERE record_month_year = '".$startDateReport."' 
    order by id ASC 
    ) s "; 

其餘的將是相同的。