Luasql question and some other help

[Vijay <vijay@...>]

Hi list,
Firstly, pardon me if my question is already answered. I've never
really used mailing lists much and I couldn't figure out how to
search for my answers. If someone could point me where to get started
that would be very helpful.

More specifically, I'm running into a problem with the following
script:

--[[
   Lua version: 
     Lua 5.2.0  Copyright (C) 1994-2011 Lua.org, PUC-Rio

   Compiled Luasql manually and installed .so in appropriate places
--]]
require "luasql.postgres"

db = "tst"
query = "select word, definition from dict_list where word like 'Ab%'"

-- env = assert(luasql.postgres()) -- <-- this raises error
-- env = assert(package.loaded["luasql.postgres"]()) -- <-- fails too!!
pg = package.loaded["luasql.postgres"]
env = assert(pg.postgres()) -- <-- works!! Why??
-- Have I done something wrong that I have to look into package.loaded
--  to figure this stuff out??

con = assert(env:connect(db))
cur = assert(con:execute(query))

row = cur:fetch({}, "a")
while row do
   print(string.format("%s: %s", row.word, row.definition))
   row = cur:fetch(row, "a")
end

cur:close()
con:close()
env:close()

----

Again, please pardon me if I'm not following the standard procedures...it's
because of my inexperience.
Thanks,
Vijay.