Is it possible to define frequently used code snippets in a generic way so they can be used in different sessions?
#+srcname: r-connect
#+begin_src R :exports none :session any
library(rMySQL)
con <- dbConnect(MySQL(), user="user_name", password="password",
dbname="db_name", host="host_name")
#+end_src
#+srcname: r-query
#+begin_src R :session session-1
# <<r-connect>>
res <- dbGetQuery(con, "select * from table_name where 1")
#+end_src
Tom