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The Cosmos DB ODBC Driver is a powerful tool that allows you to connect with live Cosmos DB document databases, directly from any applications that support ODBC connectivity.

Access Cosmos DB like you would a database - read, write, and update through a standard ODBC Driver interface.

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Analyze Cosmos DB Data in R


Create data visualizations and use high-performance statistical functions to analyze Cosmos DB data in Microsoft R Open.

Access Cosmos DB data with pure R script and standard SQL. You can use the CData ODBC Driver for Cosmos DB and the RODBC package to work with remote Cosmos DB 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 Cosmos DB data and visualize Cosmos DB data in R.

Install R

You can complement the driver's performance gains from multi-threading and managed code by running the multithreaded Microsoft R Open or by running R linked with the BLAS/LAPACK libraries. This article uses Microsoft R Open (MRO).

Connect to Cosmos DB as an ODBC Data Source

Information for connecting to Cosmos DB follows, along with different instructions for configuring a DSN in Windows and Linux environments.

To obtain the connection string needed to connect to a Cosmos DB account using the SQL API, log in to the Azure Portal, select Azure Cosmos DB, and select your account. In the Settings section, click Connection String and set the following values:

  • AccountEndpoint: The Cosmos DB account URL from the Keys blade of the Cosmos DB account
  • AccountKey: In the Azure portal, navigate to the Cosmos DB service and select your Azure Cosmos DB account. From the resource menu, go to the Keys page. Find the PRIMARY KEY value and set AccountKey to this value.

When you configure the DSN, you may also want to set the Max Rows connection property. This will limit the number of rows returned, which is especially helpful for improving performance when designing reports and visualizations.

Windows

If you have not already, first specify connection properties in an ODBC DSN (data source name). This is the last step of the driver installation. You can use the Microsoft ODBC Data Source Administrator to create and configure ODBC DSNs.

Linux

If you are installing the CData ODBC Driver for Cosmos DB in a Linux environment, the driver installation predefines a system DSN. You can modify the DSN by editing the system data sources file (/etc/odbc.ini) and defining the required connection properties.

/etc/odbc.ini

[CData CosmosDB Source] Driver = CData ODBC Driver for Cosmos DB Description = My Description AccountEndpoint = myAccountEndpoint AccountKey = myAccountKey

For specific information on using these configuration files, please refer to the help documentation (installed and found online).

Load the RODBC Package

To use the driver, download the RODBC package. In RStudio, click Tools -> Install Packages and enter RODBC in the Packages box.

After installing the RODBC package, the following line loads the package:

library(RODBC)

Note: This article uses RODBC version 1.3-12. Using Microsoft R Open, you can test with the same version, using the checkpoint capabilities of Microsoft's MRAN repository. The checkpoint command enables you to install packages from a snapshot of the CRAN repository, hosted on the MRAN repository. The snapshot taken Jan. 1, 2016 contains version 1.3-12.

library(checkpoint) checkpoint("2016-01-01")

Connect to Cosmos DB Data as an ODBC Data Source

You can connect to a DSN in R with the following line:

conn <- odbcConnect("CData CosmosDB Source")

Schema Discovery

The driver models Cosmos DB APIs as relational tables, views, and stored procedures. Use the following line to retrieve the list of tables:

sqlTables(conn)

Execute SQL Queries

Use the sqlQuery function to execute any SQL query supported by the Cosmos DB API.

customers <- sqlQuery(conn, "SELECT City, CompanyName FROM Customers", believeNRows=FALSE, rows_at_time=1)

You can view the results in a data viewer window with the following command:

View(customers)

Plot Cosmos DB Data

You can now analyze Cosmos DB 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(customers$CompanyName, main="Cosmos DB Customers", names.arg = customers$City, horiz=TRUE)