I am trying to execute drush command from my project root directory and i am getting following error 

bootstrap a site that has not been installed or does not have a
configured database. In this case you can select another site with a
working database setup by specifying the URI to use with the --uri
parameter on the command line. See `drush topic docs-aliases` for
details.
 \* connect the database through a socket. The socket file may be
wrong or the php-cli may have no access to it in a jailed shell.