php – 在pdo中获取多个select

参见英文答案 > PDO multiple queries                                    1个
问题是我的总行数没有显示的输出结果.
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;?>
}
?>

可能是什么原因不起作用,我错过了什么？

解决方法:

您可以使用 – > nextRowset()来访问下一个数据(如果是计数).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;
    }
}
?>