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Editorial Team
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Asked: 2026-05-30T19:08:04+00:00

How can I setup my codeigniter application so that if it cant connect to

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How can I setup my codeigniter application so that if it cant connect to one mysql server it connects to another? ie: set primary mysql and secondary mysql.

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1 Answer

  1. Editorial Team

    I would set up multiple codeigniter databases in the config/database (see below)

    $db['default']['hostname'] = 'localhost';
$db['default']['username'] = 'uname';
$db['default']['password'] = 'pword';
$db['default']['database'] = '';
$db['default']['dbdriver'] = 'mysql';
$db['default']['dbprefix'] = '';
$db['default']['pconnect'] = TRUE;
$db['default']['db_debug'] = TRUE;
$db['default']['cache_on'] = FALSE;
$db['default']['cachedir'] = '';
$db['default']['char_set'] = 'utf8';
$db['default']['dbcollat'] = 'utf8_general_ci';
$db['default']['swap_pre'] = '';
$db['default']['autoinit'] = TRUE;
$db['default']['stricton'] = FALSE;


$db['db2']['hostname'] = 'hostname1';
$db['db2']['username'] = 'uname';
$db['db2']['password'] = 'pword';
$db['db2']['database'] = '';
$db['db2']['dbdriver'] = 'mysql';
$db['db2']['dbprefix'] = '';
$db['db2']['pconnect'] = TRUE;
$db['db2']['db_debug'] = TRUE;
$db['db2']['cache_on'] = FALSE;
$db['db2']['cachedir'] = '';
$db['db2']['char_set'] = 'utf8';
$db['db2']['dbcollat'] = 'utf8_general_ci';
$db['db2']['swap_pre'] = '';
$db['db2']['autoinit'] = TRUE;
$db['db2']['stricton'] = FALSE;

    Then in my controller I would load the database and check if it was successful.

     $this->db = $this->load->database('default', TRUE); //If it isn't pre-loaded 

    if($this->db->conn_id === FALSE){
      $this->db = $this->load->database('db2', TRUE); 
    }

    I haven’t tested it but I would assume it would work.

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