无法连接到 cpanel 数据库

Question

I have made an sql database in cpanel and adding some data to a table. I am now trying to access it and print out the data on my website, but I am not convinced I have the php correct. A tutorial I found to explain it is using xampp and not a real online website. so far I have a database handler php file with,

<?php

$dbServername = "localhost";
$dbUsername = "username";
$dbPassword = "password";
$dbName = "databasename";

$conn = mysqli_connect($dbServername, $dbUsername, $dbPassword, $dbName);

In my index.php file I have,

<?php

include_once('php/db_handler.php');

?>

//some html code

    <?php
    //Choose all fields in table
    $sql ="SELECT * users;";

    //var to put in all the results
    $results = mysqli_query($conn, $sql);

    //var to get the number of rows returned.
    $resultcheck = mysqli_num_rows($result);

    //if the number of rows returned is not empty, then cycle through all results and print the stated ones to the screen.
    if($resultcheck > 0){
        while($row = mysqli_fetch_assoc($result)) {
            echo $row['$email, $username'];
        }
    }
    ?>




  //more html code

I am not totally sure what I should be using for database server name, In cpanel there is a section with server info and it gives me the servername webhosting2004, I have tried this also which does not work.

The username and password are as per the user details in mysql databases (using my cpanel accountname_name)

I get the following on the error log

[05-Nov-2019 12:31:51 UTC] PHP Warning:  mysqli_connect(): (HY000/1045): Access denied for user 'dannyjeb_admin'@'old' (using password: YES) in /home/dannyjeb/public_html/php/db_handler.php on line 8
[05-Nov-2019 12:31:51 UTC] PHP Warning:  mysqli_query() expects parameter 1 to be mysqli, boolean given in /home/dannyjeb/public_html/test.php on line 48
[05-Nov-2019 12:31:51 UTC] PHP Warning:  mysqli_num_rows() expects parameter 1 to be mysqli_result, null given in /home/dannyjeb/public_html/test.php on line 51

Answer 1

You can start by displaying connection errors to determine if the connection works

$conn = mysqli_connect($dbServername, $dbUsername, $dbPassword, $dbName);
if (!$conn) {
    echo "Error: Unable to connect to MySQL." . PHP_EOL;
    echo "Debugging errno: " . mysqli_connect_errno() . PHP_EOL;
    echo "Debugging error: " . mysqli_connect_error() . PHP_EOL;
    exit;
}

Second. Make sure you have remote access to your database allowed. If not, allow it. To do this, go to RemoteMysql from cPanel and add %.% to allow users from any origin.

Third. If you are not sure about the user for the database connection, you can always create a new MySQL user to use for your connection.

Answer 2

Check your error log what kind of error is showing.