Php PDO错误的行数

Question

Can someone explain me when i echo $rows_affected variable, why i only get 1 when I should be getting 2 based on my db records? More than half an hour trying to figure out this and still cant solve it.. Still noob on PDO.

Any other advices are welcome.

$sql1 = "SELECT title FROM page WHERE id=?";
        $stm = $db->prepare($sql1);
        $stm->execute(array($id));
        $row1 = $stm->fetch(PDO::FETCH_ASSOC);

        $sql2 = "SELECT id,title,pg_title FROM page WHERE title=? ORDER BY id ASC";
        $stm = $db->prepare($sql2);
        $stm->execute(array($row1['title']));

        $rows_affected = $stm->fetchColumn();

        if (count($rows_affected) > 0) {
            for($i=0; $i <= $rows_affected; $i++) {

                $row2 = $stm->fetch(PDO::FETCH_ASSOC);

                if($row2['id']==$id){
                    echo '<a href="javascript: void(0)"><b>'.$row2['pg_title'].'</b></a>&nbsp;&nbsp;';
                }else{
                    echo '<a href="page.php?id='.$row2['id'].'';?><?php if(isset($_GET['edit']) && $_GET['edit']==1){ echo '&edit=1';}?><?php echo'">'.$row2['pg_title'].'</a>&nbsp;&nbsp;';

                }
            }
        }

Answer 1

fetchColumn():

Returns a single column from the next row of a result set or FALSE if there are no more rows.

I think you want to use fetchAll(). Use PDO::FETCH_COLUMN as the $fetch_style if you only want the first column. E.g.

$rows_affected = $stm->fetchAll(PDO::FETCH_COLUMN, 0);