Mongo DB Driver for WP7

Athens-Mongo DB-User-Group3rd Meeting

By Nick Tsapakis

Intro

• What is a Mongo DB driver

• Why WP7

• Tools used

• How we worked

• Driver explained - Demo

Tools used

• Netcat

• Wireshark

• WP7 SDK – VS2010 – C#

• Mongo DB

Specification

• Mongo DB wire protocol

http://docs.mongodb.org/meta-driver/latest/legacy/mongodb-wire-protocol/

How we worked

• Netcat used for sending data to socket without using a program

• Data for sending placed in a file

• Command used for sending data:

nc 127.0.0.1 27017 < data_file.txt

How we worked

• Wireshark used for capturing commands – responses

• Verifying that captured messages follow Mongo DB wire protocol specification

• Sending commands we want to implement in driver (select, insert, delete)

How we worked

How we worked

How we worked

• Visual Studio 2010 with WP7 SDK – Free (run apps on emulator)

• Need registering the phone device as developer device – Not Free

• Pay approx. 100 dollars for 1 year

• I am telling you all !!!

How we worked

Driver details

• Driver consists of 2 classes

• MongodbDriver.cs is actual Driver class

• SocketClient.cs is a tcp comms class used only by MongodbDriver.cs

• MongodbDriver Methods availableFind() , insert() , remove()

Messages Request – Reply• There will be no response sent for any other message except

OP_QUERY and OP_GET_MORE messages

• You can determine if a message was successful with a getLastError command

• The database will respond to an OP_QUERY message with an OP_REPLY message

• There is no response to an OP_DELETE message

• There is no response to an OP_INSERT message

Message Request structure

Message Reply structure

How to use Driver

• Add as reference the 2 classes

• Create MongodbDriver instanceMongodbDriver mongo = new MongodbDriver(server, port, database, collection);

• Call a methodresponse = mongo.find(arguments);

Arguments is a sting with following format (eg.) -> name:magic,pass:mypass,

What is supported

• 3 methods supported for select, insert, delete

• Only AND among input parameters on the 3 methods

• Only string, Object ID types supported

• No getLastError command supported

• One OP_REPLY message supported

• Tested on WP7 phone

Demo

• Demo on WP7 SDK Emulator

• Demo on a WP7 mobile device (Nokia Lumia)

Epilogue

• Comments – suggestions

• Ideas