Proper way to pass parameters to query in R DBI

Question

In perl/python DBI APIs have a mechanism to safely interpolate in parameters to an sql query. For example in python I would do:

cursor.execute(\"SELECT * FR         


        

Answer 1

Just for completeness, I'll add an answer based on Hadley's comment. The DBI package now has the function sqlInterpolate which can also perform this. It requires a list of function arguments to be named in the sql query that all must start with a ?. Excerpt from the DBI manual below

sql <- "SELECT * FROM X WHERE name = ?name"
sqlInterpolate(ANSI(), sql, name = "Hadley")
# This is safe because the single quote has been double escaped
sqlInterpolate(ANSI(), sql, name = "H'); DROP TABLE--;")

Answer 2

Indeed the use of bind variables is not really well documented. Anyway the ODBC commands in R work differently for different databases. One possibility for postgres would be like this:

res <- postgresqlExecStatement(con, "SELECT * FROM table WHERE value > $1", c(5))
postgresqlFetch(res)
postgresqlCloseResult(res)

Hope it helps.