fearRacious on "Error establishing Database connection"

Hello guys..

So, I have finished created a multisite.And published it..The site was on a 209.105.244.10/~executiv and moved it to http://executiveairambulance.com but after doing it the it gives me an error saying (Error establishing a database connection)..I have did the instruction shown here http://halfelf.org/2012/moving-wordpress-multisite/ and the http://interconnectit.com/products/search-and-replace-for-wordpress-databases/ intrusction here. I also,change the site on the wp-config which the code is

/** Allow Multisite **/

define('WP_ALLOW_MULTISITE', true);
define('MULTISITE', true);
define('SUBDOMAIN_INSTALL', false);
$base = '/';
define('DOMAIN_CURRENT_SITE', 'executiveairambulance.com' );
define('PATH_CURRENT_SITE', '/');
define('SITE_ID_CURRENT_SITE', 1);
define('BLOG_ID_CURRENT_SITE', 1);

and the htaccess
# BEGIN WordPress
RewriteEngine On
RewriteBase /~executiv/
RewriteRule ^index\.php$ - [L]

# add a trailing slash to /wp-admin
RewriteRule ^([_0-9a-zA-Z-]+/)?wp-admin$ $1wp-admin/ [R=301,L]

RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^ - [L]
RewriteRule ^([_0-9a-zA-Z-]+/)?(wp-(content|admin|includes).*) $2 [L]
RewriteRule ^([_0-9a-zA-Z-]+/)?(.*\.php)$ $2 [L]
RewriteRule . index.php [L]

# END WordPress

So,anyone can help me how to fix this??