Question

我已经尝试了所有的东西，我点击提交后直接显示的数据显示，但是一旦我刷新页面，它就消失了。如何正确回显已存储在数据库中的数据？这是我目前的代码！

<h1>News Blog</h1>
<form method="POST">
    username: <input type="name" name="name" placeholder="name"><br />
    <textarea name="body" rows="10" cols="70"></textarea><br/>
    <input type="submit">
</form>

<?php
    if(isset($_POST['name'], $_POST['body'])){
        require'core/connect.php';

        //inserting data
        $query = dbConnect()->prepare("INSERT INTO blog (name, body) VALUES(?,?)");
        $query->bindParam(1, $_POST['name']);
        $query->bindParam(2, $_POST['body']);
        $query->execute();


        //getting data
        $stmt = dbConnect()->prepare("SELECT name, body FROM blog WHERE name=:name AND body=:body");
        $stmt->execute();

        while($rows = $stmt->fetch(PDO::FETCH_ASSOC)){
            echo $rows['name'], '<br /><hr>';
            echo $rows['body'];
        }
    }

?>

Answer 1

您错过了为选定查询绑定指定占位符:name和:body的参数：

    //getting data
    $stmt = dbConnect()->prepare("SELECT name, body FROM blog WHERE name=:name AND body=:body");

    // Add following two lines
    $stmt->bindParam(':name', $_POST['name'], PDO::PARAM_STR);
    $stmt->bindParam(':body', $_POST['body'], PDO::PARAM_STR);

    $stmt->execute();

    while($rows = $stmt->fetch(PDO::FETCH_ASSOC)){
        echo $rows['name'], '<br /><hr>';
        echo $rows['body'];
    }

PDO从数据库中获取信息

1 个答案: