[R] Detect expired RSQLiteConnection?

[Hadley Wickham]

DBI 0.3 (just released to CRAN) includes a new generic, dbIsValid(),
for exactly this purpose. Unfortunately no packages implement a method
for it yet, but eventually it will be the right way to detect this
problem.

(I'm now the maintainer for RSQLite, so I added this to my to do list:
https://github.com/rstats-db/RSQLite/issues/36. Pull requests are very
welcome!)

Hadley

On Tue, Sep 2, 2014 at 7:32 AM, Duncan Murdoch <murdoch.duncan at gmail.com> wrote:
> Is there a test for an expired RSQLiteConnection?  For example, if I run
>
> library(RSQLite)
> f <- tempfile()
> con <- dbConnect(SQLite(), f)
> dbDisconnect(con)
> con
>
> then I get
>
>> con
> <Expired SQLiteConnection: DBI CON (11737, 2)>
>
> and most operations using it give errors. (In my case I have a
> persistent connection object, but if I save the workspace and then
> reload it, I get the expired connection.) I'd like to detect this case.
>  Do I need to use try(), or parse the result of printing it?
>
> Duncan Murdoch
>
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