Cannot login wp-login.php or view webpage,

Hello,

I cannot login or view my webpage. At first the page displayed, “Error cannot access the database” Now I am getting this error when I try to access the admin panel or any page on the website.

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Unable to connect

Firefox can’t establish a connection to the server at ****** (I have deleted the website name)

The site could be temporarily unavailable or too busy. Try again in a few moments.
If you are unable to load any pages, check your computer’s network connection.
If your computer or network is protected by a firewall or proxy, make sure that Firefox is permitted to access the Web.

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IS this a server or plug in issue?