douzi3756 2017-09-01 21:27 采纳率: 100%
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用于运行SQL命令的HTML按钮

I'm a bit of a noob at php/sql (well all languages in general), I am trying to get an sql command to run on the click of a html button.

The sql command that I am trying to run is UPDATE supplies SET quantity = quantity + 1 WHERE Id=1

This is what I have at the moment:

dp.php

<?php
$servername = "localhost";
$dbname = "tonor";
$username = "root";
$password = "password";

    try {
        $conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
        $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    } catch(PDOException $e) {
        echo "Connection failed: " . $e->getMessage();
    }
?>

index.php

<!DOCTYPE html>
<html>
    <head>
    <?php 
        require_once 'db.php';

        if(isset($_POST['data'])){
            $sth = $conn->prepare("UPDATE supplies SET quantity = quantity + 1 WHERE Id=1");
            $sth->execute();
        }
    ?>
    <title>Homepage</title>
    <link rel="stylesheet" type="text/css" href="style/main.css">
</head>
<body>
    <h1>testpage</h1>
    <form method="POST" action="index.php">
        <input type="submit" name="data" value="1"/>
    </form>
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2条回答 默认 最新

  • douduan5073 2017-09-01 21:44
    关注

    You should try this out, but you need to read, and practice further.

    PDO manual: http://php.net/manual/en/book.pdo.php

    It's a lot to look at, but just take a look at their examples to get an idea of how it works.

    Read this as well to make it easier: https://code.tutsplus.com/tutorials/why-you-should-be-using-phps-pdo-for-database-access--net-12059

    PHP is a server side language.

    I any case, the following should be enough to get you started.

     <?php
    $servername = "localhost";
    $dbname = "databasename";
    $username = "username";
    $password = "password";

    try {
        $conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
        $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    } catch(PDOException $e) {
        echo "Connection failed: " . $e->getMessage();
    }

    return $conn;
?>


<!DOCTYPE html>
<html>
    <head>
    <?php 
        require 'db.php';

        if(isset($_POST['data'])){
            $sth = $conn->prepare("UPDATE supplies SET quantity = quantity + 1 WHERE Id=1");
            $sth->execute();
        }
    ?>
    <title>Homepage</title>
    <link rel="stylesheet" type="text/css" href="style/main.css">
</head>
<body>
    <h1>testpage</h1>
    <form method="POST" action="">
        <input type="submit" name="data" value="1"/>
    </form>

</body>
</html>
    本回答被题主选为最佳回答 , 对您是否有帮助呢?
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