php pdo oop 获取数据不工作

Question

Class PHP

<?php

    class product extends db {

        function viewCat(){

            $dbcon = new db();
            $connn = $dbcon->dbcon();

            try {
                $stmt = $connn->prepare("SELECT * FROM `cat`");

                $resultcat = $stmt->execute();

                return $resultcat;

            } catch (PDOException $e) {
                echo 'Error: ' . $e->getMessage();
            }

        }  

    }

    ?>

风景

<?php
$menu = new product();

$resultmenux = $menu->viewCat();


    foreach ($resultcatx as $row) {
        print_r($row);
    }

?>

我得到的错误是

警告：为 foreach() 提供的参数无效

Answer 1

应该是这样的：

$resultmenux = $menu->viewCat();


foreach ($resultmenux as $row) {
    print_r($row);
}

Answer 2

在你的 class 文件中它应该是，正如我评论的那样你没有获取数据

$stmt = $connn->prepare("SELECT * FROM `cat`");

$stmt->execute();

$resultcat = $stml->fetchAll(PDO::FETCH_ASSOC); // this line was missing

return $resultcat;

并在查看文件中由 shankhan 回答

$resultmenux = $menu->viewCat();    

foreach ($resultmenux as $row) {
    print_r($row);
}

php pdo oop 获取数据不工作

php pdo oop fetch data not working

php

oop

pdo