PDOStatement 中可捕获的致命错误

Question

我不确定我做错了什么。我的代码应该从 mysql 中的用户表中读取 user_id，然后在下一个 sql 语句中使用它来读取该销售人员过去一周的销售行，然后生成 PDF。在第 56 行，我收到一个可捕获的致命错误：PDOStatement 类的对象无法转换为字符串，但据我所知它应该是一个字符串。任何帮助将不胜感激！

for($i=0;$i<$user_array;$i++) {
$uid = $user_array[$i];
try {
    //Create connection
    $con = new PDO("mysql:host=$servername; dbname=$database", $username, $password);
    $con->exec("SET CHARACTER SET utf8");
}
catch(PDOException $ee) {
    echo $ee->getMessage();
}

$con->beginTransaction();
$query = "SELECT CONCAT(fname,' ',lname) FROM users WHERE user_id = '$uid'";
$result = $con->query($query);

if($result !== false) {

    //This throws catchable fatal error: Object of class PDOStatement could not be converted to string - line 56
    $sql = "select saledate, custname, straddr from dplgalionsales 
    WHERE CONCAT(agent_first_name,' ',agent_last_name) = '$result'         //<-- line 56 
    and saledate > DATE_SUB(NOW(), INTERVAL 1 WEEK)"; 

    foreach($res->query($sql) as $row) {
        $mydate = date('m/d/Y');
        $dateadd = date('m/d/Y', strtotime($mydate.' + 3 days'));

        $html_table = '<div>Week Ending: ' .$mydate. '<br>Payroll Issued: ' .$dateadd. '</div><br>';
        $html_table .= '<table border="1" cellspacing="0" cellpadding="2" width="100%"><tr><th>Date</th><th>Customer Name</th><th>Address</th></tr>';

        $html_table .= '<tr><td>' .$row['saledate']. '</td><td>' .$row['custname']. '</td><td>' .$row['straddr']. ' ' .$row['city']. ' ' .$row['state']. ' ' .$row['zip']. '</td></tr>';

        $html_table .= '</table>'; //ends HTML table

    }


}

$mpdf = new mPDF();
$mpdf->SetTitle('DPL Galion Sales');
$mpdf->WriteHTML($html_table);
$mpdf->Output('./reports/'.$uid.'/'.date('m-d-Y').'_'.$uidname.'.pdf','F');
exit;
}

我想知道它是否与 MySQL CONCAT() 有关？不过，我真的不知道匹配销售人员信息的更好方法，因为名字和姓氏是分开的，而且销售报告中没有他们的销售 ID，所以名字是两个表之间的唯一参考点。谢谢！

Answer 1

您应该为该自定义字段使用别名：

CONCAT(fname,' ',lname) as fullName

然后将$result 更改为$result['fullName']。

其他建议

1. 将整个事务放入 try/catch 中，如果捕获异常则回滚
2. 使用准备好的语句

---

try {
    for ($i = 0; $i < $user_array; $i++) {
        $uid = $user_array[$i];

        //Create connection
        $con = new PDO("mysql:host=$servername; dbname=$database", $username, $password);
        $con->exec("SET CHARACTER SET utf8");


        $con->beginTransaction();
        $sql = "SELECT CONCAT(fname,' ',lname) as fullName FROM users WHERE user_id = :uid";
        $result = $con->prepare($sql);


        if ($result !== false) {
            $result->bindValue(':uid', $uid);
            $row = $result->fetch(PDO::FETCH_ASSOC);
            //This throws catchable fatal error: Object of class PDOStatement could not be converted to string - line 56
            $sql = "select saledate, custname, straddr from dplgalionsales
                    WHERE CONCAT(agent_first_name,' ',agent_last_name) = :fullname         //<-- line 56
                    and saledate > DATE_SUB(NOW(), INTERVAL 1 WEEK)";
            $result = $con->prepare($sql);
            $result->bindValue(':fullName', $row['fullName']);
            $rows = $result->fetchAll();
            foreach ($rows as $row) {
                $mydate = date('m/d/Y');
                $dateadd = date('m/d/Y', strtotime($mydate . ' + 3 days'));

                $html_table = '<div>Week Ending: ' . $mydate . '<br>Payroll Issued: ' . $dateadd . '</div><br>';
                $html_table .= '<table border="1" cellspacing="0" cellpadding="2" width="100%"><tr><th>Date</th><th>Customer Name</th><th>Address</th></tr>';

                $html_table .= '<tr><td>' . $row['saledate'] . '</td><td>' . $row['custname'] . '</td><td>' . $row['straddr'] . ' ' . $row['city'] . ' ' . $row['state'] . ' ' . $row['zip'] . '</td></tr>';

                $html_table .= '</table>'; //ends HTML table

            }


        }

        $mpdf = new mPDF();
        $mpdf->SetTitle('DPL Galion Sales');
        $mpdf->WriteHTML($html_table);
        $mpdf->Output('./reports/' . $uid . '/' . date('m-d-Y') . '_' . $uidname . '.pdf', 'F');
        exit;
    }
} catch (PDOException $ee) {
    $con->rollBack();
    echo $ee->getMessage();
}