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问题描述
如何使用mysqli输出返回的行数?我的下面的代码通过一个while循环显示了0($ s-> fetch()echo $ uid;)显示了2个结果；
How do I output the number of returned rows using mysqli? My code below shows 0 though a while loop (while $s->fetch() echo $uid;) shows 2 results;
$m = new mysqli(MYSQL_SERVER, MYSQL_USER, MYSQL_PASS, MYSQL_DB);
$s=$m->prepare("SELECT uid FROM user WHERE token=? AND secret=?");
$s->bind_param('ss',$rt, $rs);
$rt='c';
$rs='d';
$s->execute();
$s->bind_result($uid);
$s->fetch();
print_r($s->num_rows); // RESULTS IN 0
推荐答案
您必须在mysqli_stmt::execute()之后和提取之前调用mysqli_stmt::store_result()才能知道mysqli_stmt::num_rows:
You'll have to call mysqli_stmt::store_result() after mysqli_stmt::execute() and before fetch in order to know mysqli_stmt::num_rows:
$s->execute();
$s->store_result();
print_r($s->num_rows);
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