[R] why querying Sybase IQ using RODBC returns error ?

[Prof Brian Ripley]

This is a known bug in Sybase's ODBC driver, and yes, the workarounds 
are documented in the package.  Have you actually read the documentation?

On 30/07/2012 05:51, Alok Jadhav wrote:
> Hello,
>
>   I am not able to query Sybase IQ database from R using RODBC package.
> Check the below code
>
> R> sybaseiq.query <- function (sql, ..., as.is = FALSE)
> {
>    connstr <- "Driver={Sybase
> IQ};UID=ajadhav2;PWD=*****;ServerName=PSGSESHR01A_IQ;CommLinks=SharedMemory,TCPIP{host=psgseshr01_iq.sg.csfb.com;port=3051}"
>    chan <- odbcDriverConnect(connstr)
>    on.exit(odbcClose(chan))
>    if (length(list(...)) > 0)
>      sql <- sprintf(sql, ...)
>    x <- sqlQuery(chan, sql, as.is = as.is)
>    return(x)
> }
> R>
> R>
> R>
> R> x <- sybaseiq.query("select * from syagprd1.orders where
> tradedate='120727' and acct='DVW'")
> Error in .Call(C_RODBCFetchRows, attr(channel, "handle_ptr"), max, buffsize,
> :
>    negative length vectors are not allowed
> R> x
> [1] "42000 -131 [Sybase][ODBC Driver][Sybase IQ]Syntax error near 'order' on
> line 1"
> [2] "[RODBC] ERROR: Could not SQLExecDirect 'select * from syagprd1.order
> where tradedate='120727' and acct='DVW' and ptag=-1 and sym='BHP.AX''"
>
>
> This is same behavior for empty datasets also
>
> R> x <- agora.query.iq("select * from syagprd1.orders where 1=2")
> Error in .Call(C_RODBCFetchRows, attr(channel, "handle_ptr"), max, buffsize,
> :
>    negative length vectors are not allowed
>
> I am not sure what is wrong. Are their some arguments I need to know while I
> create chan to resolve this issue?
>
> Thanks for your help in advance.
>
> Regards,
> Alok
>
>
>
> --
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> Sent from the R help mailing list archive at Nabble.com.
>
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-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595