Luvit MongoDB Driver

This is a pure luvit Mongodb driver with async Api.

What is Luvit?

Luvit is a Node.js like, with Asynchronous I/O support language for Lua.

Learn more a: Luvit

Install

• With lit:

  Run

    lit install cyrilis/luvit-mongodb

  in terminal under your project path, then require("luvit-mongodb") in your project.

• Or copy source files:

  Just put source file in your project, then require it with ./path/to/luvit-mongodb

Getting started

local Mongo = require("luvit-mongodb")
local db = Mongo:new({db = "DATABASE_NAME"})
-- replace `DATABASE_NAME` above with a DB name.
db:on("connect", function()
	-- Do stuff here.
    local Post = db:collection("post")
    local page = 1
    Post:insert({
		    title = "Hello word!",
		    content = "Here is the first blog post ....",
		    author = "Cyril Hou"
		},function(err, res)
		    p(res)
	    end)
	local posts = Post:find({author = "Cyril Hou"})
	posts:limit(10):skip(page * 10):update({authorAge = 25}):exec(function(err, res)
		p(err, res)
	end)

	Post:distinct("category", function(err, res)
		p("All distinct value of `category` in post collections: ", res)
	end)
end)

Cursor

• update

  cursor:update(doc[, callback])

  • doc: table, required, The modifications to apply.
  • callback: optional, callback function

  post:update({abc = 123}, function(err, res)
  	 p(err, res)
  end)
  -- same as bellow ⬇️
  post:update({abc = 123}):exec(function(err, res)
  	 p(err, res)
  end)

• find

  cursor:find(query[, callback])

  • query: table, optional , Specifies selection criteria using query operators. To return all documents in a collection, omit this parameter or pass an empty document ({}).
  • callback: optional， callback function

  post:find({abc = 123}, function(err, res)
  	 p(err, res)
  end)
  -- same as bellow ⬇️
  post:find({abc = 123}):exec(function(err, res)
  	 p(err, res)
  end)

• remove

  cursor:remove([callback])

  • callback: optional, callback function

  post:remove(function(err, res)
  	 p(err, res)
  end)
  -- same as bellow ⬇️
  post:remove():exec(function(err, res)
  	 p(err, res)
  end)

• skip

  cursor:skip(skip[, callback])

  • skip: number, docs to skip in query.
  • callback: optional, callback function

• limit

  cursor:limit(limit[, callback])

  • limit: number, limit return docs count.
  • callback: optional, callback function

• Sort

  cursor:sort(doc[, callback])

  • doc: table,
  • callback: optional, callback function

  Example:

  local User = db:collection("user")
  User:find():sort({age = 1}):exec(function(err, res)
      p(err, res)
  end)

• count

  cursor:count([callback])

  • callback: optional, callback function

  post:count(function(err, res)
  	 p(err, res)
  end)
  -- same as bellow ⬇️
  post:remove():exec(function(err, res)
  	 p(err, res)
  end)

• exec

  cursor:exec(callback)

  • callback: required, callback function

    Execute callback function after set query and limit skip params.

Collection

• initialize

  A collection should initialize with db instance.

  db:collection(collectionName)

  • collectionName: string, name for collection in name.

  	local coll = db:collection("post")

• find

  coll:find(query[, callback])

  • query: table, optional, Specifies selection criteria using query operators. To return all documents in a collection, omit this parameter or pass an empty document ({}).
  • callback: function, optional, callback function.

  	 coll:find({id = 1}):exec(function(err, res)
  		 p(err, res)
  	 end)
     -- same as bellow ⬇️
  	 coll:find({id = 1}, function(err, res)
  		 p(err, res)
  	 end)

• distinct

`coll:distinct(field[, query][, callback])`

• field: string, required, The field for which to return distinct values.

• query: table, optional, A query that specifies the documents from which to retrieve the distinct values.

• callback: function, optional, Callback function.

  coll:distinct("category", {public = true}, function(err, res)
  	p(err, res)
  end)

• drop

  coll:drop(callback)

  • callback: function, required, callback function

  coll:drop(function(err, res)
  	 p(err, res)
  end)

• findAndModify

  coll:findAndModify(query, update[, callback])

  • query: table, required, Optional. The selection criteria for the modification. The query field employs the same query selectors as used in the collection.find() method. Although the query may match multiple documents, findAndModify() will only select one document to modify.
  • update: table, required, The update field employs the same update operators or field: value specifications to modify the selected document.
  • callback: function, optional, Callback function.

  coll:findAndModify({abc = 123}, {def = true}, function(err, res)
  		 p(err, res)
  end)

• findOne

  coll:findOne(query[, callback])

  • query: table, required, Optional. The selection criteria for the modification. The query field employs the same query selectors as used in the collection.find() method. Although the query may match multiple documents, findAndModify() will only select one document to modify.
  • callback: function, optional, Callback function.

  coll:findOne({abc = 123}, function(err, res)
  		 p(err, res)
  end)

• remove

  coll:remove(query[, callback])

  • query: table, required, Optional. The selection criteria for the modification. The query field employs the same query selectors as used in the collection.find() method
  • callback: function, optional, Callback function.

  coll:remove({public = false}, function(err, res)
  	 	p(err, res)
  end)

• insert

  coll:insert(doc[, callback])

  • doc: table, required, A document or array of documents to insert into the collection.
  • callback: function, optional, Callback function.

  coll:insert({title = "Hello World!"}, function(err, res)
  	  	p(err, res)
  end)

chainable cursor example:

coll:find():update({public = true}):exec(function(err, res)
	p(err, res)
end)

Database

• insert:

  `db:insert(collection, document, continue, callback)`
  - `collection`: Database collection name, **required**
  - `document`: lua table, **required**
  

  • continue: if continue when error occured
  • callback: function, with inserted document as #1 parameter

• find:

  `db:find(collection, query, fields, skip, limit, callback)`
  

  • collection: Database collection name, required
  • query: mongodb query eg: { type: { $in: [ 'food', 'snacks' ] } } or just { type: "snacks" }, required
  • fields: limit field for return, eg: { item: 1, qty: 1, _id:0 }
  • skip: skip counts, int
  • limit: limit return counts, int
  • callback: function, with found documents array as #1 parameter

• update:

  `db:update(collection, query, update, upsert, single, callback)`
  - `collection`: Database collection name, **required**
  

  • query: mongodb query eg: { type: { $in: [ 'food', 'snacks' ] } } or just { type: "snacks" }, required
  • update: mongodb update, eg: { $set: { "detail": "14Q2" } }, required
  • upsert: if not find result with query params, insert a record with update params.
  • single: update multiple records or single record, boolean.
  • callback: function, without parameters

• remove

  `(collection, query, single, callback)`
  - `collection`: Database collection name, **required**
  

  • query: mongodb query eg: { type: { $in: [ 'food', 'snacks' ] } } or just { type: "snacks" }, required

  • single: remove multiple records or single, boolean.

    - `callback`: function, without parameters
    

• count

  `(collection, query, callback)`
  - `collection`: Database collection name, **required**
  

  • query: mongodb query eg: { type: { $in: [ 'food', 'snacks' ] } } or just { type: "snacks" }, required

    - `callback`: function, without parameters
    

• findOne:

  `db:find(collection, query, fields, skip, callback)`
  

  • collection: Database collection name, required
  • query: mongodb query eg: { type: { $in: [ 'food', 'snacks' ] } } or just { type: "snacks" }, required
  • fields: limit field for return, eg: { item: 1, qty: 1, _id:0 }
  • skip: skip counts, int
  • callback: function, without found document as #1 parameter

• createIndex:

• dropIndex:

• dropIndexes

• getIndexes

Test and example

See files in "test/" Folder

If you have any issue while use this library please let me know. thanks.

TODO:

• Bit64 support
• Bit32 support
• Date type support
• Cursor
• Raw Command support
• Write concern
• Auth
• Create index
• Get index
• Remove index

License

The MIT License (MIT)

Copyright (c) 2015 Cyril Hou<houshoushuai@gmail.com>

Permission is hereby granted, free of charge, to any person obtaining a copy

of this software and associated documentation files (the "Software"), to deal

in the Software without restriction, including without limitation the rights

to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

copies of the Software, and to permit persons to whom the Software is

furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all

copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE

SOFTWARE.