RS-DBI, is a set of classes and methods for interfacing R, S, and S-Plus to relational database systems (RDBMS). For details see A Common Interface to Relational Databases from R and S (or as an Adobe's PDF file).
Please send us your suggestions and comments on the RS-DBI to either the The R Databases Special Interest Group or The Omega Project for Statistical Computing
RS-DBIinterfaces to MySQL, SQLite, and Oracle. You may download the code from here (for a DBI implementation to PostgreSQL see RPgSQL).
RPgSQLwhich has its own implementation of the RS-DBI) to connect R and the corresponding database(s).
Depending on the platform it's running, S-Plus provides access
to some DBMS through the
functions. Under Microsoft Windows you may import/export data
ODBC; under Solaris (and only Solaris) you
may import data from Informix, Oracle, and Sybase.
See also the function