Database Connectivity with R Programming

Last Updated : 01 Jun, 2020

The database is a collection of organized information so that it can be accessed with ease. It can be accessed or stored at the computer system. It can be managed through a Database management system (DBMS), which is a software that is used to manage data. Database refers to related data which is in a structured form.

It supports the storage and manipulation of data. Basically a database is having 5 sublanguages:

Data Definition Language(DDL)
Data Query Language(DQL)
Data Manipulation Language(DML)
Data Control Language(DCL)
Transaction Control Language(TCL)

To connect Database with R Programming we will be going to connect R script with MySQL Database.

To install MYSql refer to its official site dev.mysql.com

To begin with the connection process, follow the steps given below:

Step 1: Create a database in MySQL with the following command:

create database databasename;

As you can see in this image we have used the commands to access the database and moreover performed the DML operations in the database.

Step 2: To connect the database with R we can use R Studio. To download R Studio visit rstudio.com
R-Studio-Download

Step 3: Use the following command to install the MySQL library in RStudio:

install.packages("RMySQL")

Now execute the following commands as RScript:

#To check whether the library is installed or not 
library(RMySQL) 
   
# Create a connection Object to MySQL database. 
mysqlconnection = dbConnect(MySQL(), user = 'root',  
                                 password = 'root', 
    dbname = 'onlinetutorials', host = 'localhost') 
typeof(mys) 
   
# List the tables available in this database. 
dbListTables(mysqlconnection) 
   
# Query the "actor" tables to get all the rows. 
a = dbSendQuery(mysqlconnection,  
                "create table students(id int, name varchar(10))") 
a = dbSendQuery(mysqlconnection,  
                "insert into students values(101, 'amit')") 
a = dbSendQuery(mysqlconnection,  
                "insert into students values(102, 'aman')") 
result = dbSendQuery(mysqlconnection,  
                     "select * from students") 
   
# Store the result in a R data frame object. 
# n = 5 is used to fetch first 5 rows. 
data.frame = fetch(result) 
print(data.frame) 

Output:

Contingency Tables in R Programming

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Database Connectivity with R Programming

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