连接失败：用户'root'访问被拒绝@'localhost'（使用密码：NO）“在wordpress中[重复]

I have got error when try to insert data using PHP code to wordpress database.

Error like this :

Connect failed: Access denied for user 'username'@'localhost' (using password: NO)” in wordpress

How can I fix this.

I'm working on live server.

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Check your config.php in the main folder and look for this lines if there configure correctly.

/** MySQL database username */
define('DB_USER', '');

/** MySQL database password */
define('DB_PASSWORD', '');

/** MySQL hostname */
define('DB_HOST', 'localhost');