Mysql 代码点火器：发生数据库错误SQLSTATE[HY000][2054]服务器请求的身份验证方法客户端未知

我正在尝试将网站上载到服务器。CodeIgniter是我在这个网站上使用的框架，我是第一次使用CI。尝试使用以下数据库设置将网站上载到服务器时：

 $db['default'] = array(
    'dsn'   => 'mysql:host=localhost;dbname=database_name',
    'hostname' => 'mysql:host=localhost',
    'username' => 'database_user',
    'password' => 'database_password',
    'database' => 'database_name',
    'dbdriver' => 'pdo',
    '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
    );

我已经得到如下错误，我试图搜索网络来解决我的问题。我发现了一些与我类似的问题，但我不知道应该做什么，因为大多数问题都是针对本地服务器的。请有人帮我解决这个问题谢谢

A Database Error Occurred

SQLSTATE[HY000] [2054] The server requested authentication method unknown to the client

Filename: controllers/Home.php

Line Number: 9


A PHP Error was encountered

Severity: Warning  
Message: PDO::__construct(): The server requested authentication method unknown to the client [mysql_old_password]
Filename: pdo/pdo_driver.php
Line Number: 133

Backtrace:

编辑：

试试：

$db['default'] = array(
    'hostname' => 'localhost',
    'username' => 'user',
    'password' => 'password',
    'database' => 'database_name',
    '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
);

或

尝试：

或

---

可以在database.php中将此代码用于数据库设置

$active_group = 'live';
$active_record = TRUE;

$db['live']['hostname'] = 'localhost';
$db['live']['username'] = 'user';
$db['live']['password'] = 'password';
$db['live']['database'] = 'database';
$db['live']['dbdriver'] = 'pdo';
$db['live']['dbprefix'] = '';
$db['live']['pconnect'] = TRUE;
$db['live']['db_debug'] = TRUE;
$db['live']['cache_on'] = FALSE;
$db['live']['cachedir'] = '';
$db['live']['char_set'] = 'utf8';
$db['live']['dbcollat'] = 'utf8_general_ci';
$db['live']['swap_pre'] = '';
$db['live']['autoinit'] = TRUE;
$db['live']['stricton'] = FALSE;

设置

$config[“useDatabaseConfig”]=true

我希望它能为您工作。
您可以在database.php中将此代码用于数据库设置

$active_group = 'live';
$active_record = TRUE;

$db['live']['hostname'] = 'localhost';
$db['live']['username'] = 'user';
$db['live']['password'] = 'password';
$db['live']['database'] = 'database';
$db['live']['dbdriver'] = 'pdo';
$db['live']['dbprefix'] = '';
$db['live']['pconnect'] = TRUE;
$db['live']['db_debug'] = TRUE;
$db['live']['cache_on'] = FALSE;
$db['live']['cachedir'] = '';
$db['live']['char_set'] = 'utf8';
$db['live']['dbcollat'] = 'utf8_general_ci';
$db['live']['swap_pre'] = '';
$db['live']['autoinit'] = TRUE;
$db['live']['stricton'] = FALSE;

设置
$config[“useDatabaseConfig”]=true

我希望它能为您工作。
按第一种方式执行它会产生以下错误：致命错误：在/home/name/public\u html/system/database/drivers/mysqli/mysqli\u driver.php第1361行调用未定义函数mysqli\u init（），按第一种方式执行它会产生以下错误：致命错误：调用未定义函数mysqli\u init（）在第136行的/home/name/public_html/system/database/drivers/mysqli/mysqli_driver.php中