This is where u can find the connection string or database details of your wordpress

Details of database are stored in the wp-config.php which is located in the root directory of wordpress. 
/** MySQL database username */
define('DB_USER', '****');
/** MySQL database password */
define('DB_PASSWORD', '****');
/** MySQL hostname */
define('DB_HOST', 'localhost:/tmp/mysql.sock');
/** Database Charset to use in creating database tables. */
define('DB_CHARSET', 'utf8');
/** The Database Collate type. Don't change this if in doubt. */
define('DB_COLLATE', '');