php - 当我用 PDO 重写我的代码时，计数不起作用

Question

一旦我从 mysql 更改为 pdo，我就无法计算了。我不确定该怎么做。

<tr>
    <td style="width: 125px">
        <a href="SystemsTechsPages/xgrh/xgrhCompleted1.php" target="_top">xgrh</a>
    </td>
    <td style="width: 125px" align="center">
        <a href="SystemsTechsPages/xgrh/xgrhCompleted1.php" target="_top">
        <?php 

        $stmt = $db->prepare("
            SELECT COUNT(*) FROM WHERE requests status='Completed' AND compDT=Curdate() AND compUser='xgrh'
        ");  
        while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) { 
            echo $row['COUNT(*)'];  
        }  
        ?>
        </a>
    </td>
</tr>

Answer 1

首先，确保查询正确:

缺少表名

SELECT COUNT(*) FROM (what happened here? no table name)

WHERE status='Completed' 
AND compDT=Curdate() 
AND compUser = 'xgrh'

其次，您可以只使用别名来更好地访问列名:

<?php 
// prepare
$stmt = $db->prepare("
    SELECT COUNT(*) AS total FROM table_name 
    WHERE status='Completed' 
    AND compDT = Curdate() 
    AND compUser = 'xgrh'
");
$stmt->execute(); // execute
$result = $stmt->fetch_assoc(PDO::FETCH_ASSOC);
$count = $result['total'];
echo $count;

?>