Question

在过去的几天里，我一直在努力学习如何搜索mysql数据库。到目前为止，我有以下代码。由于某种原因，它没有搜索并给我结果。我的数据库被命名为得分，表格都是得分。有人请帮帮我。

它应该搜索我的数据库，但它没有结果。我已经确定一切都是正确的。

此文件为searching.php

<?php




    if(isset($_POST['search']))
    {

        $id = $_POST['id'];


        $connect = mysqli_connect("localhost", "root", "root","score");


        $query = "SELECT `name` FROM `all_scores` WHERE `id` = $id LIMIT 1";

        $result = mysqli_query($connect, $query);


        if(mysqli_num_rows($result) > 0)
        {
          while ($row = mysqli_fetch_array($result))
          {
            $name = $row['name'];

          }  
        }


        else {
            echo "Undifined ID";
                $gameid = "";

        }


        mysqli_free_result($result);
        mysqli_close($connect);

    }


    else{
        $gameid = "";

    }


    ?>

这是search.php

<head>

    <title> PHP FIND DATA </title>

    <meta charset="UTF-8">

    <meta name="viewport" content="width=device-width, initial-scale=1.0">

</head>

<body>

<form action="searching.php" method="post">

    Id:<input type="text" name="id"><br><br>



    <input type="submit" name="search" value="Find">

       </form>

</body>

我真的希望我能让这个工作。在此先感谢您的帮助。

Answer 1

要获取php文件中的表单值，您需要使用$_POST。以下是使用PDO的示例。您只需检索一行，因此您不需要while循环。

<强> searching.php

$(window).resize(function () {

    // Debounce our resizing
    var debounce = setTimeout(function() {

        // Only set attribute viewbox once   
        function setView(c, w, h) {
            if (!c.getAttribute("viewBox")) {
                var viewBox = "20 0 " + w + " " + h + "";
                c.setAttribute("viewBox", viewBox);
                c.setAttribute("preserveAspectRatio", "xMidYMid meet");
            }
        }

        // Reset previous timers
        clearTimeout(reset);
        clearTimeout(debounce);

        // Set variables
        var cal = d3.select("svg.RdYlGn")[0][0],
        parent = cal.parentElement,
        aspect = Math.round(parent.offsetWidth / parent.offsetHeight);
        var newHeight = (parent.offsetWidth / aspect),
            newWidth = parent.offsetWidth,
            oldHeight = cal.getAttribute("height") || cal.offsetHeight,
            oldWidth = cal.getAttribute("width") || cal.offsetWidth;

        // Set the viewbox
        setView(cal,oldWidth,oldHeight);

        // Set new dimensions for calendar
        cal.setAttribute("height", newWidth / aspect);
        cal.setAttribute("width", newWidth);

        // Make sure parent <div> behaves and follows with calendar                            
        var reset = setTimeout(function() {
            parent.setAttribute("width", cal.getAttribute("width"));
            parent.setAttribute("height", cal.getAttribute("width")/aspect);
            }, 500);
        }, 300);

    });

<强> HTML

<?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "dbname";
try{
    $conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
    $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    $q = $conn->prepare("SELECT `name` FROM `all_scores` WHERE `id` = :id LIMIT 1");
    $q->bindValue(':id', $_POST['id'], PDO::PARAM_STR, 50);
    $q->execute();
    if ($q->rowCount() > 0){
        $check = $q->fetch(PDO::FETCH_ASSOC);
        $row_id = $check['id'];
        // do something
    }
}catch(PDOException $e)
{
    echo  $e->getMessage();
}
?>

花点时间看一下several other examples

如何使用php搜索sql数据库

1 个答案: