php - php 的 MYSQL 数据库连接

Question

我正在使用带有 php mysql_connect 的网站数据库，但我的托管提供商说我需要使用 mysqli_connect。

当我编辑连接文件并更新更改方法时，它不适用于 mysqli。

当前使用此代码:

MSQL方法:

$con=mysql_connect("localhost","username","password");
mysql_select_db("databasename"); 

对于 mysqli，我使用此代码但失败了

MYSQLI方法:

$con = mysqli_connect("localhost","my_user","my_password","my_db");

请帮忙。为什么 mysqli 不工作？难道是我的方法不对？

Answer 1

试试这个:

示例(MySQLi 面向对象)

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

    // Create connection
    $conn = new mysqli($servername, $username, $password, $dbname);

    // Check connection
    if ($conn->connect_error) {
        die("Connection failed: " . $conn->connect_error);
    }
    echo "Connected successfully";
    ?>  

示例(MySQLi 过程)

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

// Create connection
$conn = mysqli_connect($servername, $username, $password,  $dbname);

// Check connection
if (!$conn) {
    die("Connection failed: " . mysqli_connect_error());
}
echo "Connected successfully";
?>