Access to Database Management Systems (DBMS)

ODBC Interface

The RODBC package provides access to databases (including Microsoft Access and Microsoft SQL Server) through an ODBC interface.

The primary functions are given below.

Function Description
odbcConnect(dsn, uid="", pwd="") Open a connection to an ODBC database
sqlFetch(channel, sqtable) Read a table from an ODBC database into a data frame
sqlQuery(channel, query) Submit a query to an ODBC database and return the results
sqlSave(channel, mydf, tablename = sqtable, append = FALSE) Write or update (append=True) a data frame to a table in the ODBC database
sqlDrop(channel, sqtable) Remove a table from the ODBC database
close(channel) Close the connection

# RODBC Example
# import 2 tables (Crime and Punishment) from a DBMS
# into R data frames (and call them crimedat and pundat)

library(RODBC)
myconn <-odbcConnect("mydsn", uid="Rob", pwd="aardvark")
crimedat <- sqlFetch(myconn, "Crime")
pundat <- sqlQuery(myconn, "select * from Punishment")
close(myconn)

Other Interfaces

The RMySQL package provides an interface to MySQL.

The ROracle package provides an interface for Oracle.

The RJDBC package provides access to databases through a JDBC interface.