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Analyze CouchDB Data in R
Use standard R functions and the development environment of your choice to analyze CouchDB data with the CData JDBC Driver for CouchDB.
Access CouchDB data with pure R script and standard SQL on any machine where R and Java can be installed. You can use the CData JDBC Driver for CouchDB and the RJDBC package to work with remote CouchDB data in R. By using the CData Driver, you are leveraging a driver written for industry-proven standards to access your data in the popular, open-source R language. This article shows how to use the driver to execute SQL queries to CouchDB and visualize CouchDB data by calling standard R functions.
Install R
You can match the driver's performance gains from multi-threading and managed code by running the multithreaded Microsoft R Open or by running open R linked with the BLAS/LAPACK libraries. This article uses Microsoft R Open 3.2.3, which is preconfigured to install packages from the Jan. 1, 2016 snapshot of the CRAN repository. This snapshot ensures reproducibility.
Load the RJDBC Package
To use the driver, download the RJDBC package. After installing the RJDBC package, the following line loads the package:
library(RJDBC)
Connect to CouchDB as a JDBC Data Source
You will need the following information to connect to CouchDB as a JDBC data source:
- Driver Class: Set this to cdata.jdbc.apachecouchdb.ApacheCouchDBDriver
- Classpath: Set this to the location of the driver JAR. By default this is the lib subfolder of the installation folder.
The DBI functions, such as dbConnect and dbSendQuery, provide a unified interface for writing data access code in R. Use the following line to initialize a DBI driver that can make JDBC requests to the CData JDBC Driver for CouchDB:
driver <- JDBC(driverClass = "cdata.jdbc.apachecouchdb.ApacheCouchDBDriver", classPath = "MyInstallationDir\lib\cdata.jdbc.apachecouchdb.jar", identifier.quote = "'")
You can now use DBI functions to connect to CouchDB and execute SQL queries. Initialize the JDBC connection with the dbConnect function.
Set the following to connect:
- Url: The Url of your instance. For example: http://localhost:5984
- User The Apache CouchDB user account used to authenticate.
- Password The Apache CouchDB password associated with the authenticating user.
Built-in Connection String Designer
For assistance in constructing the JDBC URL, use the connection string designer built into the CouchDB JDBC Driver. Either double-click the JAR file or execute the jar file from the command-line.
java -jar cdata.jdbc.apachecouchdb.jar
Fill in the connection properties and copy the connection string to the clipboard.
Below is a sample dbConnect call, including a typical JDBC connection string:
conn <- dbConnect(driver,"jdbc:apachecouchdb:Url=http://localhost:5984;User=abc123;Password=abcdef;")
Schema Discovery
The driver models CouchDB APIs as relational tables, views, and stored procedures. Use the following line to retrieve the list of tables:
dbListTables(conn)
Execute SQL Queries
You can use the dbGetQuery function to execute any SQL query supported by the CouchDB API:
movies <- dbGetQuery(conn,"SELECT MovieRuntime, MovieRating FROM Movies WHERE MovieRating = 'R'")
You can view the results in a data viewer window with the following command:
View(movies)
Plot CouchDB Data
You can now analyze CouchDB data with any of the data visualization packages available in the CRAN repository. You can create simple bar plots with the built-in bar plot function:
par(las=2,ps=10,mar=c(5,15,4,2))
barplot(movies$MovieRating, main="CouchDB Movies", names.arg = movies$MovieRuntime, horiz=TRUE)
Ready to get started?
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