Introducing php7 to connect to MySQL to create a simple query program

Simple Tutorial
Assume that we are making a class status inquiry program and will use PHP7 environment to connect in the form of PDO MySQL.
Check your class by student number and name.

Recommended (free): PHP7
Let’s first introduce the file structure and database structure:
PHP:
config.php stores database configuration information
cx.php query program
index.html user interface
The structure is as shown

MySQL:
Table Name: data
Field: 1.Sid 2.name 3.class

The structure is as shown in the figure

Ready, let’s start, now!
First build the user interface (index.html), two simple edit boxes and a simple button:

nbsp;html>
    <meta>
    <title>分班查询系统</title>

Okay, let’s configure the database information (config.php)

<?php $server="localhost";//主机的IP地址$db_username="root";//数据库用户名$db_password="123456";//数据库密码$db_name = "data";

Then write our main program (cx.php)

<?phpheader ("Content-Type: text/html; charset=utf8");if(!isset($_POST["submit"])){
    exit("未检测到表单提交");}//检测是否有submit操作include ("config.php");$Sid = $_POST[&#39;Sid&#39;];//post获得学号表单值$name = $_POST[&#39;name&#39;];//post获得姓名表单值echo "<table style=&#39;border: solid 1px black;&#39;>";echo "<tr>
<th>学号</th>
<th>姓名</th>
<th>班级</th>
</tr>";class TableRows extends RecursiveIteratorIterator{
    function __construct($it)
    {
        parent::__construct($it, self::LEAVES_ONLY);
    }

    function current()
    {
        return "<td>" . parent::current() . "</td>";
    }

    function beginChildren()
    {
        echo "<tr>";
    }

    function endChildren()
    {
        echo "</tr>" . "\n";
    }}try {
    $conn = new PDO("mysql:host=$server;dbname=$db_name", $db_username, $db_password);
    $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    $stmt = $conn->prepare("SELECT Sid, name, class FROM data where Sid=$Sid and name='$name'");
    $stmt->execute();

    // 设置结果集为关联数组
    $result = $stmt->setFetchMode(PDO::FETCH_ASSOC);
    foreach (new TableRows(new RecursiveArrayIterator($stmt->fetchAll())) as $k => $v) {
        echo $v;
    }} catch (PDOException $e) {
    echo "Error: " . $e->getMessage();}$conn = null;echo "";

This program is finished
Let’s give it a try

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