本文介紹了簡(jiǎn)化:mysqli num_rows 不工作的處理方法，對(duì)大家解決問(wèn)題具有一定的參考價(jià)值，需要的朋友們下面隨著小編來(lái)一起學(xué)習(xí)吧！
問(wèn)題描述
如何使用mysqli輸出返回的行數(shù)?我下面的代碼通過(guò) while 循環(huán)顯示 0 (while $s->fetch() echo $uid;) 顯示 2 個(gè)結(jié)果；
$m = new mysqli(MYSQL_SERVER, MYSQL_USER, MYSQL_PASS, MYSQL_DB);$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);//結(jié)果為 0 解決方案
你必須在 mysqli_stmt::execute() 之后調(diào)用 mysqli_stmt::store_result()在獲取之前為了知道 mysqli_stmt::num_rows:
$s->execute();$s->store_result();print_r($s->num_rows);num_rows上的 PHP 文檔
store_result() 上的 PHP 文檔
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
解決方案
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);
PHP Document on num_rows
PHP Document on store_result()
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