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How to create a simple query program to connect MySQL with php7

醉折花枝作酒筹forward: 2021-05-21 09:09:102462browse

This article will introduce to you how to connect php7 to MySQL to create a simple query program. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to everyone.

Simple Tutorial

Assume that we are making a class status inquiry program and connect the environment using PHP7 in the form of PDO MySQL.

Check your class by student number and name.

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

How to create a simple query program to connect MySQL with php7

The structure is as shown in the figure

MySQL:

Table name: data

Fields: 1.Sid 2.name 3.

How to create a simple query program to connect MySQL with php7

##The structure is as shown in the figure

Prepare Ready, get started, now!

First build the user interface (index.html), two simple edit boxes plus a simple button:

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>分班查询系统</title>
</head>
<body>
<form action="cx.php" method="post">
    <p>学号:<input type="text" name="xuehao"></p>
    <p>姓名: <input type="text" name="xingming"></p>
    <p><input type="submit" name="submit" value="查询"></p>
</form>
</body>
</html>

Okay, then 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)

<?php
header("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 style=&#39;width:150px;border:1px solid black;&#39;>" . 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=&#39;$name&#39;");
    $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 "</table>";

This program is finished

Let’s try it

How to create a simple query program to connect MySQL with php7

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