Book Image

Haskell Data Analysis cookbook

By : Nishant Shukla
Book Image

Haskell Data Analysis cookbook

By: Nishant Shukla

Overview of this book

Step-by-step recipes filled with practical code samples and engaging examples demonstrate Haskell in practice, and then the concepts behind the code. This book shows functional developers and analysts how to leverage their existing knowledge of Haskell specifically for high-quality data analysis. A good understanding of data sets and functional programming is assumed.
Table of Contents (14 chapters)
13
Index

Saving data to a MongoDB database

MongoDB can very naturally store unstructured data using the JSON syntax. In this recipe, we will store a list of people to MongoDB.

Getting ready

We must first install MongoDB on our machine. The installation files can be downloaded from http://www.mongodb.org.

We need to make a directory for the database using the following command:

$ mkdir ~/db

Finally, start the MongoDB daemon on that directory using the following command:

$ mongod –dbpath ~/db

Install the MongoDB package from cabal using the following command:

$ cabal install mongoDB

How to do it…

Create a new file called Main.hs and perform the following steps:

  1. Import the libraries as follows:
    {-# LANGUAGE OverloadedStrings, ExtendedDefaultRules #-}
    import Database.MongoDB
    import Control.Monad.Trans (liftIO)
  2. Define a data type for the names of people as follows:
    data Person = Person { first :: String 
                         , last :: String }
  3. Set up a couple of data items we wish to store as follows...