[Rd] errors in getconnection or scan

[Duncan Murdoch]

On 13/12/2010 12:36 PM, Arthur Charpentier wrote:
> I was wondering if there was a function like "does connection exists" ?

See ?showConnections.

> I am currently using loops to build up a database, and I have either
>
>>   B = getConnection(localization)
> Error in getConnection(localization) : there is no connection -2147483648
> In addition: Warning message:
> In getConnection(localization) : NAs introduced by coercion

Where did the localization variable come from?  getConnection is pretty 
rarely used.

>
> or
>
>>   B = scan(localization)
> Error in file(file, "r") : cannot open the connection
> In addition: Warning message:
> In file(file, "r") : cannot open: HTTP status was '404 Not Found'
>
> is there a way to test where localization is an html page, or not ? and to
> say that if localization does exist, then scan it ?

What's your definition of an html page?  Testing for valid html is hard.

Duncan Murdoch