在pdo中获取多个选择

Question

问题是我的总行数没有显示输出结果。我的实际代码：

<?
$stmt = $dbh->prepare("SELECT SQL_CALC_FOUND_ROWS * FROM table WHERE mark=0 ORDER BY id ASC LIMIT 0, 15; SELECT FOUND_ROWS() as total;");
$stmt->execute();
if ($stmt->rowCount() > 0)
{
?>
<span>Number or rows: <? echo $stmt->total; ?></span>
<?
while($result = $stmt->fetch(PDO::FETCH_OBJ))
{
<?=$result->id;?>
<?=$result->user;?>
}
?>

为何无法正常工作，我错过了什么吗？

Answer 1

您可以使用->nextRowset()访问下一个数据（以计数为准）。首先获取（获取）所需的行。然后得到计数：

<?php
$stmt = $dbh->prepare("
    SELECT SQL_CALC_FOUND_ROWS * FROM table WHERE mark=0 ORDER BY id ASC LIMIT 0, 15; 
    SELECT FOUND_ROWS() as total;
");

$stmt->execute();

$values = $stmt->fetchAll(PDO::FETCH_OBJ);

$stmt->nextRowset(); // shift to the total

$count = $stmt->fetchColumn(); // get the total

?>

<span>Number of rows: <? echo $count; ?></span>

<?php
if($count > 0) {
    foreach($values as $v) {
        // iterate fetched rows
        echo $v->id;
    }
}
?>