Hello Rui,
it's very helpful.
Thank you,
Kai
On Wednesday, July 14, 2021, 10:07:57 AM PDT, Rui Barradas
<ruipbarra...@sapo.pt> wrote:
Hello,
Just before for(j in 1:nrow(ora)) include the following code line (I
have removed the underscore):
sdif <- vector("list", length = nrow(ora))
In the loop:
sdif[[j]] <- sqldf(etc)
Also, once again, why noquote? It's better to form file names with
file.path:
rdcsv <- file.path("w:/project/_Joe.B/Oracle/data", mycsv)
Hope this helps,
Rui Barradas
Às 16:55 de 14/07/2021, Kai Yang via R-help escreveu:
> Hello List,
> I wrote a script below to compare the difference of data frames structure
> (and will do something else). First of all I save the file list in a data
> frame ora, then I use for loop to 1. load the data from two resource, 2.
> generate data structure into two data frames, 3.do the comparesion of the two
> data frames of data structure and put it into a data frame, 4. remove the
> useless data frames for next loop
> for (j in 1:nrow(ora))
> {
> mycol <- ora[j,"fname"]
> #--------------------work on csv------------
> mycsv <- paste0(mycol,".csv")
> rdcsv <- noquote(paste0("w:/project/_Joe.B/Oracle/data/", mycsv))
> rr <- read.csv(rdcsv)
>
> #--------------------work on SS ------------
> myss <- paste0("gemd.", mycol)
> rdss <- paste0('select * from ',myss)
> ss <- dbGetQuery(con, rdss)
>
> #--------------------compare DF structure ------------
> str_rr <- as.data.frame(summary.default(rr))
> str_ss <- as.data.frame(summary.default(ss))
>
>
> sdif_[j] <- sqldf('select * from str_rr except select * from str_ss')
>
> #---------remove data frame from memory--------------
>
> rm(rr)
> rm(ss)
> rm(str_rr)
> rm(str_ss)
> }
> In the step 3, I want to use ora$fname in the loop to assign a data frame
> name. So, I will look the output later. But sdif_[j] doesn't work for this.
> Can someone help me to fix this part?
> Thanks,
> Kai
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>
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