Teach me how to program

http://127.0.0.1/ci3/

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I still receive this error message:

A PHP Error was encountered
Severity: Warning
Message: mysqli::real_connect(): (HY000/1044): Access denied for user ''@localhost to database 'gsaconst_database'
Filename: mysqli/mysqli_driver.php
Line Number: 202
Backtrace:
File: C:\xampp\htdocs\ci3\application\core\MY_Controller.php
Line: 7
Function: __construct
File: C:\xampp\htdocs\ci3\application\controllers\home.php
Line: 9
Function: __construct
File: C:\xampp\htdocs\ci3\index.php
Line: 292
Function: require_once
A Database Error Occurred
Unable to connect to your database server using the provided settings.
Filename: C:/xampp/htdocs/ci3/application/core/MY_Controller.php
Line Number: 7


I delete the password.


database.php

PHP Code:

$db['default'] = array(
    'dsn'    => '',
    'hostname' => 'localhost',
    'username' => 'gsaconst_admin',
    'password' => '',
    'database' => 'gsaconst_database',
    'dbdriver' => 'mysqli',
    'dbprefix' => 'pix_',
    'pconnect' => TRUE,
    'db_debug' => (ENVIRONMENT !== 'production'),
    'cache_on' => FALSE,
    'cachedir' => '',
    'char_set' => 'utf8',
    'dbcollat' => 'utf8_general_ci',
    'swap_pre' => '',
    'encrypt' => FALSE,
    'compress' => FALSE,
    'stricton' => FALSE,
    'failover' => array(),
    'save_queries' => TRUE
); 


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