local mongo = require('mongo')
-- Create a connection object
local db = assert(mongo.Connection.New())
-- connect to the server on localhost
assert(db:connect('localhost'))
-- create a GridFileBuilder handle
local gridfs = mongo.GridFS.New(db, 'test')
local builder = assert(mongo.GridFileBuilder.New(gridfs) )
-- example loop generating data on-the-fly
for i=1,100 do
    assert(builder:append(string.format("Line number %d\n", i)))
end
-- set the name of the file and it will be visible in GridFS
assert(builder:build('myfile.txt'))
-- create a GridFS handle
local gridfs = assert(mongo.GridFS.New(db, 'test'))
local gridfile = assert(gridfs:find_file('myfile.txt'))
-- print file content
for i=1,gridfile:num_chunks() do
    local chunk = assert(gridfile:chunk(i-1))
    io.write(chunk:data())
end