Codeigniter多个数据库连接访问被拒绝的问题

Question

database.php

中的

$db['default'] = array(
    'dsn'   => '',
    'hostname' => 'localhost',
    'username' => 'bd1',
    'password' => 'pass3214',
    'database' => 'db1',
    'dbdriver' => 'mysqli',
    'dbprefix' => '',
    'pconnect' => FALSE,
    '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
);

$db['conncetdbtest'] = array(
    'dsn'   => '',
    'hostname' => 'localhost',
    'username' => 'db2',
    'password' => 'pass123',
    'database' => 'db2',
    'dbdriver' => 'mysqli',
    'dbprefix' => '',
    'pconnect' => FALSE,
    '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
);

test.php 视图

中的

<?php

$DB2 = $this->load->database('conncetdbtest' , TRUE);
$querydb2 = $DB2 ->select('*')->get('test');
print_r($querydb2);

?>

当我运行代码时，显示消息：mysqli :: real_connect（）:( HY000 / 1045）：拒绝访问用户'db2'@'localhost'（使用密码：YES）。

无法解决。请帮我 。