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Paco Zamora Martinez edited this page Dec 23, 2015 · 4 revisions

A Lua driver for MongoDB

Wiki Documentation

Support

Submit issues to the moai github site.

There is a Google Groups mailing list.

Example

local mongo = require('mongo')

-- Create a connection object
local db = assert(mongo.Connection.New())

-- connect to the server on localhost
assert(db:connect('localhost'))

-- insert a value into the namespace 'test.values'
assert(db:insert('test.values', {a = 10, b = 'str1'}))

-- the same using a JSON string
assert(db:insert('test.values', "{'a': 20, 'b': 'str2'}"))

-- insert a multiple values into the namespace 'test.values'
assert(db:insert_batch('test.values', {{a = 10, b = 'str1'}, {c = 11, d = 'str2'}}))

-- print the number of rows in the namespace 'test.values'
print(db:count('test.values'))

-- query all the values in the namespace 'test.values'
local q = assert(db:query('test.values', {}))

-- loop through the result set
for result in q:results() do
    print(result.a)
    print(result.b)
end

How It Works

LuaMongo is a Lua library that wraps the mongodb C++ API.

The current implementation does not give you raw access to the BSON objects. BSON objects are passed to the API using a Lua table or a JSON string representation. Every returned BSON document is fully marshalled to a Lua table.

Installing

luarocks can be used to install LuaMongo last SCM version:

luarocks install "https://raw.githubusercontent.com/moai/luamongo/master/rockspec/luamongo-scm-0.rockspec"

or install any other of the versions available at rockspec directory.

For modern Linux systems, you will need to update your luarocks configuration file, usually located at /usr/local/etc/luarocks/config.lua, adding the following Lua table:

external_deps_dirs = {
  {
    prefix='/usr/',
    include='include',
    lib='lib',
  },
  {
    prefix='/usr/',
    include='include',
    lib='lib/i386-linux-gnu',
  },
  {
    prefix='/usr/',
    include='include',
    lib='lib/x86_64-linux-gnu',
  },
  {
    prefix='/usr/local',
  },
}