当使用stmt-> prepare()时,如何找出查询返回的行数? / stmt-> execute();
在下面的例子中,如果我没有得到任何结果,我想向用户显示一条好消息
任何想法如何实现这一目标?
由于
编辑: 正如@zerkms所述,有一个解决方案但是,我希望有一个解决方案不会在语句句柄中缓冲整个结果集......
...
$selected_disc = array(1=>'disc1', 2=>'disc2', 3=>'disc3');
// show tracks for each disc in album
$sql = 'SELECT track_id, name FROM album WHERE album_id = ?';
foreach ($selected_disc as $key => $disc) {
$stmt->prepare($sql);
$stmt->bind_param('i', $key);
$ok = $stmt->execute();
$stmt->bind_result($trackid, $name);
if( VALUES FOUND, SHOW !) {
while ($stmt->fetch()) {
echo $t_name;
}
} else {
echo 'Nothing to display... blablabla';
}
$stmt->free_result(); // free the database resources for other queries
}
...
答案 0 :(得分:1)
答案 1 :(得分:0)
/* execute query */
$stmt->execute();
/* store result */
$stmt->store_result();
printf("Number of rows: %d.\n", $stmt->num_rows);