Connecting to SingleStore Database Using R script

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This article covers the different ways you can connect to the memSQL database using R script — particularly using RMySQL and RJDBC libraries.

In this article, I will be describing the different ways you can connect to the memSQL database using R. In particular, we will be discussing the RMySQL and RJDBC libraries.

One interesting fact about memSQL is although its architecture has nothing to do with the open source MySQL database, memSQL makes it fairly easy to connect to the memSQL databases using MySQL database connectivity drivers. In short, you can connect to the memSQL database using the same drivers and protocols as you do for MySQL.   

Although this document has been written to work both on cluster-in-box and Distributed mode, the success of the connection will depend on the property of the server to accept connection from outside its environment — and of course, the correct connection parameters of the code.

Connecting using RMySQL library :

Steps:

1. Open the RGui

2. Install the RMySQL library using the command – 

   > install.packages(“RMySQL”)
   
   

3. Load this library in the R session :

   >library(RMySQL)
   

4. Now create the connection variable for accessing the memSQL database:

   > memsql_connection <- 
     RMySQL::dbConnect(
       RMySQL::MySQL() 
       ,host = "database server url or ip"
       ,port = <server port>
       ,user = "<user>"
       ,password = "<password>" 
       ,dbname = “<database name>”)
   
   

5. Check if connection was successful :

   RMySQL::dbListTables(memsql_connection)
   

Connecting using the RJDBC library:

Pre-Requisites:

1. Java runtime environment must be setup and must be mapped in the environment variables

Steps:

1. Open the RGui

2. Install the RJBDC library using the command – 

   > install.packages(“RJDBC”)
   

3. Load this library in the R session :

   >library(RJDBC)
   
   

4. Now create the connection variable for accessing the memSQL database:

   > jdbc_drv <- RJDBC::JDBC(“com.mysql.cj.jdbc.Driver" , classPath = list.files("<PATH 
   TO MYSQL JDBC Driver >/mysql-connector-java-8.0.22", pattern="jar$",full.names=T), 
   identifier.quote="'")
   
   >jdbc_con <- dbConnect(jdbc_drv, "jdbc:mysql://<IP>:<PORT>/<DBNAME>", 
   "username", "password")
   

5. Check if connection was successful :

There are few other ways to connect to the SingleStore DB using R, a common method on a windows machine would be the ODBC. If you are looking for the ODBC mode, just create the ODBC variable on your machine and connect using the DSN.