How to connect to postgresql using url

I had asked an earlier question which did not get any replies.

Basically I get an error invalid database url when I try to do heroku db:push.

I figured I can try explicitly providing the database url.

I tried:

heroku db:push postgres://postgres@localhost/myrailsdb

But that gave error:

Failed to connect to database:
  Sequel::DatabaseConnectionError -> PGError fe_sendauth: no password supplied

What is the format for providing username and password?

Solution 1:

Try heroku db:push postgres://username:password@localhost/myrailsdb.

Solution 2:

Here's how to do it in a Ruby script:

# Connect to database.
uri = URI.parse(ENV['DATABASE_URL'])
postgres = PG.connect(uri.hostname, uri.port, nil, nil, uri.path[1..-1], uri.user, uri.password)

# List all tables.
tables = postgres.exec('SELECT * FROM pg_catalog.pg_tables')
tables.num_tuples.times do |i|
  p tables[i]
end