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CodeIgniter MySQLi Driver: How to Fix \'Unable to Connect to Database\' Errors?

Patricia Arquette
Patricia ArquetteOriginal
2024-11-27 04:00:13684browse

CodeIgniter MySQLi Driver: How to Fix

CodeIgniter: Resolving "Unable to Connect to Database" Error with MySQL Driver

Problem Statement:

When attempting to switch from the MySQL driver to the MySQLi driver in CodeIgniter, users encounter the following error message:

Unable to connect to your database server using the provided settings.

Configuration Details:

The provided database configuration settings are as follows:

$hostname = 'localhost';
$username = 'myusernamegoeshere';
$password = 'mypasswordgoeshere';
$database = 'mydatabasenamegoeshere';
$db['default']['dbdriver'] = 'mysqli';
$db['default']['port'] = "3306"; 

Solution:

The issue is likely related to PHP configuration. To debug the database connection, follow these steps:

Step 1: Enable Database Connection Error Diagnostics

Add the following code to the end of your database.php configuration file:

...
...
...
echo '<pre class="brush:php;toolbar:false">';
print_r($db['default']);
echo '
'; echo 'Connecting to database: ' .$db['default']['database']; $dbh=mysql_connect ( $db['default']['hostname'], $db['default']['username'], $db['default']['password']) or die('Cannot connect to the database because: ' . mysql_error()); mysql_select_db ($db['default']['database']); echo '
Connected OK:' ; die( 'file: ' .__FILE__ . ' Line: ' .__LINE__);

Step 2: Debug Database Connection Attempt

Navigate to your CodeIgniter installation directory and run the following command to debug the database connection attempt:

php -f ./system/index.php db debug

Step 3: Analyze Output

The command will output detailed information about the database connection attempt, including any errors encountered. Review the output to identify the root cause of the connectivity issue.

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