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How to query the content of Mysql database in php language

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Release： 2023-03-05 10:00:02

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How to query the content of Mysql database in php language: First, the php page needs a php language execution environment when browsing; then create a php class file [mysql.php] for specific operations; then create a page file [ index.php] to receive data; finally access the path.

How to query the content of Mysql database in php language

【Related learning recommendations: mysql tutorial】

How to query the content of Mysql database in php language:

1. When browsing the php page, you need a php language execution environment. I use WampServer software. Just copy the project to wampserver_php\wamp\www\The php language can be executed under this path.

2. Create a php class file (mysql.php) for specific operations

<?php
/*设置内容类型和编码样式*/
header("content-type:text/html;charset=utf-8");
/*对数据库操作*/
class dbMysqli{
    private $conn = null;
    public $message = "";
    /*设置错误接受机制*/
    function Message($mes,$flag=true){
        if($flag){
            $this->message .="<div style=&#39;color:green;font-size:12px;&#39;>".$mes."</div>";
        }else{
            $this->message .="<div style=&#39;color:green;font-size:12px;&#39;>".$mes."</div>";
        }
    }
    
    /*连接数据库服务器，设置连接数据库编码*/
    function __construct($host,$user,$pwd,$dbName,$charset){
        //连接数据库服务器选择数据库
        $this->conn = new mysqli($host,$user,$pwd,$dbName);
        if($this->conn === false){
            $this->Message("连接数据库失败",false);
            return false;
        }else{
            $this->Message("连接数据库成功，选择数据库");
        }
        //设置连接编码
        if($this->conn->set_charset($charset)){
            $this->Message("设置编码成功");
        }else{
            $this->Message("设置编码失败",false);
        }
    }
    /*查询数据库数据*/
    public function MoreData($sql){
        $sql = trim($sql);
        /*检查sql语言是否正确*/
        $result = preg_match(&#39;/^select/i&#39;,$sql);
        if($result){
            //执行sql语句
            $rs = $this->conn->query($sql);
            if($rs === false){
                $this->Message("执行&#39;".$sql."&#39;失败，失败原因：".$this->conn->error,false);
                return false;
            }else{
                $this->Message("执行&#39;".$sql."&#39;成功");
                $RS = $rs->fetch_all(MYSQL_ASSOC);
                $rs->free();
                return $RS;
            }
        }else{
            $this->Message("执行&#39;".$sql."&#39;失败",false);
            return false;
        }
    }
}
/*链接数据库地址、用户名，密码，数据库名，编码方式*/
$db = new dbMysqli(&#39;localhost&#39;,&#39;root&#39;,&#39;cly8&#39;,&#39;user&#39;,&#39;utf-8&#39;);

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3. Create a page file (index.php) to receive data

<?php 
    header("content-type:text/html;charset=utf-8");
    error_reporting(E_ALL);
    //引入一个数据库操作类
    include_once &#39;mysql.php&#39;;
    //查询数据
    $rs = $db->MoreData("select * from student");
?>
<html>
    <head>
        <meta charset="utf-8" />
        <title>css3实现多彩动态漩涡线条特效动画</title>
    </head>
    <style>
    table{
    font-family: verdana,arial,sans-serif;
    font-size:11px;
    color:#333333;
    border-width: 1px;
    border-color: #666666;
    border-collapse: collapse;
    }
    table th {
    border-width: 1px;
    padding: 8px;
    border-style: solid;
    border-color: #666666;
    background-color: #dedede;
    }
    table td {
    border-width: 1px;
    padding: 8px;
    border-style: solid;
    border-color: #666666;
    background-color: #ffffff;
    }
    </style>
<body>
    <table>
        <tr>
            <th>编号</th>
            <th>姓名</th>
            <th>密码</th>
        </tr>
        <?php foreach($rs as $val) {?>
        <tr>
            <td><?php echo $val[&#39;Sid&#39;];?></td>
            <td><?php echo $val[&#39;Sname&#39;];?></td>
            <td><?php echo $val[&#39;Password&#39;];?></td>
        </tr>
        <?php }?>
    </table>
</body>
</html>

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4. The last access path is http://localhost/folder name/index.php

How to query the content of Mysql database in php language

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