[R] RODBC Error: 'getCharCE' must be called on a CHARSXP

[Uwe Ligges]

On 20.12.2011 16:27, Mike Pfeiff wrote:
> Thanks.   But if I do as you suggested...
>
> 	txt<-'SELECT Date,  Region, Price FROM TableXYZ WHERE Type="Domestic"'
>
> returns...
>
> 	"SELECT TradeDate, Hub, SettlementPrice FROM PowerSettlements WHERE Contract=\"ERN\""
>
> Which because of the extra "\"' is improper SQL form.
>
> Maybe I should be asking what is the proper way to return "" inside of a char string?
>

That *is* the proper way: R jsut prints a " by \" in order to show tha 
those double quotes are within a string that is enclosed in double 
quotes. It is correctly passed to the SQL interface.

Uwe ligges


> -----Original Message-----
> From: Uwe Ligges [mailto:ligges at statistik.tu-dortmund.de]
> Sent: Tuesday, December 20, 2011 8:46 AM
> To: Mike Pfeiff
> Cc: 'r-help at r-project.org'
> Subject: Re: [R] RODBC Error: 'getCharCE' must be called on a CHARSXP
>
>
>
> On 20.12.2011 14:55, Mike Pfeiff wrote:
>> I am trying to connect to an internal database and use the sqlQuery command to reduce and retrieve data using the following code:
>>
>> channel<-odbcConnect("some_dsn", uid="", pwd="") txt<-'SELECT Date,
>> Region, Price FROM TableXYZ WHERE Type="Domestic"'
>> sqlQuery(channel, cat(txt,"\n"),errors=TRUE,)
>
> sqlQuery(channel, txt, errors=TRUE)
>
> seems more plausible (since cat returns NULL).
>
> Uwe Ligges
>
>
>
>> close(channel)
>>
>> However, I get the following error immediately after sqlQuery command:
>>
>> Error in odbcQuery(channel, query, rows_at_time) :
>>     'getCharCE' must be called on a CHARSXP
>>
>> I believe my connection is good because I used the following commands to successfully view the columns:
>>
>> sqlColumns(channel, TableXYZ)
>>
>> There doesn't seem to be much info on "getCharCE" and/or "CHARSXP.
>> Any guidance the group could provide this vey new user to R, would be
>> greatly appreciated
>>
>>
>>
>>
>> 	[[alternative HTML version deleted]]
>>
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