[R] RMySQL - overwrite record, not table

[whizvast]

Hi, useR-

In RMySQL, how do I overwrite records? (equivalent to "replace" query).
For example, suppose that dat2 is a newer data.frame than dat1. 


con <- dbConnect(MySQL())
res <- dbWriteTable(con, "DBname", dat1, row.names=F, append=T, replace=T)
res <- dbWriteTable(con, "DBname", dat2, row.names=F, append=T, replace=T)


This would not update/replace the dat1 records in "DBname" with newer
records from dat2. 
How would you solve the problem? Thanks=


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