Re-jigged the class implementation to get better support from roxygen2 and CRAN check(). Majority of public functions are documented (remaining are the CRUD functions)

man/DBConnection-cash-beginTransaction.Rd

@@ -0,0 +1,15 @@
+% Generated by roxygen2: do not edit by hand
+% Please edit documentation in R/DBConnection-Transaction.R
+\name{DBConnection$beginTransaction}
+\alias{DBConnection$beginTransaction}
+\title{DBConnection$beginTransaction}
+\arguments{
+\item{session}{\if{html}{\out{<complex>}} The R Shiny session to register the callback with}
+}
+\value{
+\if{html}{\out{<function>}} A function to cancel the onSessionEnded callback
+}
+\description{
+Registers a callback with an R Shiny session so that the connection is
+disconnected once the session ends.
+}