kill connections on a specific database

kill_connections.sql

-- gist from http://stackoverflow.com/questions/5108876/kill-a-postgresql-session-connection
-- prevent people from connecting to the database
revoke connect on database :db_name from public, … ;
SELECT 
    pg_terminate_backend(pid) 
FROM 
    pg_stat_activity 
WHERE 
    -- don't kill my own connection!
    pid <> pg_backend_pid()
    -- don't kill the connections to other databases
    AND datname = ':db_name'
    ;