I moved one wordpress website from localhost (xampp) to live server(subfolder ie www.mydomain.com/demo). Move all the files and upload the database file and change the wp-config.php file.
Then I visited my website from live server , landing page (home), backend admin (wp-admin) is working fine and I am able to use the backend admin and can edit and save, But when I am clicking on menu page loading and saying
Error establishing a database connection
I think database connection is working fine bcz home page is working and backend also.I tried to create a page and that time also its showing the same error.
www.mydomain.com/demo is working when I am looking any page like www.mydomain.com/demo/contact
it's showing db connection error.