我想要count的值，并希望在其他查询中使用它。怎么可能？

Question

这是我的问题：

$qry1 = "SELECT COUNT('name') FROM `brands` WHERE `catagory_id` = '".$id."';";
$res = mysqli_query($conn, $qry1);

我想要 count的值，并希望在另一个查询中使用它。怎么可能？

Answer 1

两个步骤： 1.为count(name)，total计算的值提供有意义的名称，例如 2.使用名称total

获取结果的第一行并从1访问值

$qry1 = "SELECT COUNT(name) as total FROM `brands` WHERE `catagory_id` = '".$id."';";
$count = $mysqli->query($conn, $qry1)->fetch_object()->total;

Answer 2

尝试;

$qry1 = "SELECT COUNT(name) as counts FROM brands WHERE catagory_id = '".$id."';";
$res = mysqli_query($conn, $qry1);
$row = mysqli_fetch_array($res);
$count = $row["counts"];

现在这个$ count变量保存了该值。您可以在其他查​​询中包含此变量。