mysqli_stmt::$num_rows
(PHP 5, PHP 7)
mysqli_stmt :: $ num_rows - mysqli_stmt_num_rows - 返回语句结果集中的行数
描述
面向对象的风格
int $mysqli_stmt->num_rows;
程序风格
int mysqli_stmt_num_rows ( mysqli_stmt $stmt )返回结果集中的行数。mysqli_stmt_num_rows（）的使用取决于您是否使用mysqli_stmt_store_result（）来缓冲语句句柄中的整个结果集。
如果使用mysqli_stmt_store_result（），则可以立即调用mysqli_stmt_num_rows（）。
参数
`stmt` 仅过程风格：由mysqli_stmt_init（）返回的语句标识符。
返回值
表示结果集中行数的整数。
Examples
Example #1 Object oriented style
<?php
/*?Open?a?connection?*/
$mysqli?=?new?mysqli("localhost",?"my_user",?"my_password",?"world");
/*?check?connection?*/
if?(mysqli_connect_errno())?{
????printf("Connect?failed:?%s\n",?mysqli_connect_error());
????exit();
}
$query?=?"SELECT?Name,?CountryCode?FROM?City?ORDER?BY?Name?LIMIT?20";
if?($stmt?=?$mysqli->prepare($query))?{
????/*?execute?query?*/
????$stmt->execute();
????/*?store?result?*/
????$stmt->store_result();
????printf("Number?of?rows:?%d.\n",?$stmt->num_rows);
????/*?close?statement?*/
????$stmt->close();
}
/*?close?connection?*/
$mysqli->close();
?>Example #2 Procedural style
<?php
/*?Open?a?connection?*/
$link?=?mysqli_connect("localhost",?"my_user",?"my_password",?"world");
/*?check?connection?*/
if?(mysqli_connect_errno())?{
????printf("Connect?failed:?%s\n",?mysqli_connect_error());
????exit();
}
$query?=?"SELECT?Name,?CountryCode?FROM?City?ORDER?BY?Name?LIMIT?20";
if?($stmt?=?mysqli_prepare($link,?$query))?{
????/*?execute?query?*/
????mysqli_stmt_execute($stmt);
????/*?store?result?*/
????mysqli_stmt_store_result($stmt);
????printf("Number?of?rows:?%d.\n",?mysqli_stmt_num_rows($stmt));
????/*?close?statement?*/
????mysqli_stmt_close($stmt);
}
/*?close?connection?*/
mysqli_close($link);
?>上面的例子会输出：
Number of rows: 20.本文档系腾讯云开发者社区成员共同维护，如有问题请联系 cloudcommunity@tencent.com
