R help - Oct 2010 - append rows to Sybase datatable using RJDBC function dbWriteTable

Does anyone have experience using RJDBC library to write to Sybase
datatable? The jdbc driver I am using is jConnect 6.0. I can
successfully write into a new datatable, but have problem appending rows
to existing one. It either complains "Table *** already exists" or
simply overwrite the existing one. Here is the example.

I am trying to append "data" to the existing datatable "tmp"
> data
  	SecurityID 	Ticker
1     	12345  		AAPL 
> dbWriteTable(conn, "tmp", data, append = T, overwrite = F)
Error in .local(conn, name, value, ...) : 
  Table `tmp' already exists
> dbWriteTable(conn, "tmp", data, append = T)
[1] TRUE 

The first dbWriteTable failed as it's complaining "tmp" already
exists,
it looks strange to me as append is set to TRUE. The second dbWriteTable
succeeded but it actually overwrite exisiting rows with "data" which
is
not expected as append is set to TRUE and overwrite is default to FALSE.


Can anyone shed me some lights here? Thanks a lot for your help! 

Jingyi





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