R Under development (unstable) (2024-01-07 r85787 ucrt) -- "Unsuffered Consequences"
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> ## Test of bytea conversion with insert and retrieve to the db.
> ##
> 
> if ((Sys.getenv("POSTGRES_USER") != "") &
+     (Sys.getenv("POSTGRES_HOST") != "") &
+     (Sys.getenv("POSTGRES_DATABASE") != "")) {
+ 
+     ## try to load our module and abort if this fails
+     stopifnot(require(RPostgreSQL))
+ 
+     ## load the PostgresSQL driver
+     drv <- dbDriver("PostgreSQL")
+ 
+     ## connect to the default db
+     con <- dbConnect(drv,
+                      user=Sys.getenv("POSTGRES_USER"),
+                      password=Sys.getenv("POSTGRES_PASSWD"),
+                      host=Sys.getenv("POSTGRES_HOST"),
+                      dbname=Sys.getenv("POSTGRES_DATABASE"),
+                      port=ifelse((p<-Sys.getenv("POSTGRES_PORT"))!="", p, 5432))
+ 
+     if (dbExistsTable(con, "texttable"))
+         dbRemoveTable(con, "texttable")
+ 
+         x_df <- data.frame(x = c("a", "ö", "漢字"), stringsAsFactors = FALSE)
+ 
+         dbGetQuery(con, "SHOW server_encoding")
+         dbGetQuery(con, "SET client_encoding = 'UTF8'")
+         dbGetQuery(con, "SHOW client_encoding")
+ # write with client_encoding = 'UTF8' and read back what was wrote
+         dbWriteTable(con, "texttable", x_df, overwrite = TRUE)
+         (x_db <- dbReadTable(con, "texttable"))
+         (e <- Encoding(x_db$x))
+         stopifnot( e[1] == "unknown" )
+         stopifnot( e[2] == "UTF-8" )
+         stopifnot( e[3] == "UTF-8" )
+         cat("GOOD -- all encoding are as expected\n")
+ 
+         x_df <- data.frame(x = c("a", "ö"), stringsAsFactors = FALSE)
+         dbWriteTable(con, "texttable", x_df, overwrite = TRUE)
+         dbGetQuery(con, "SET client_encoding = 'LATIN1'")
+         dbGetQuery(con, "SHOW client_encoding")
+ # read with client_encoding = 'LATIN1' what was already in the database
+         (x_db <- dbReadTable(con, "texttable"))
+         (e <- Encoding(x_db$x))
+         stopifnot( e[1] == "unknown" )
+         stopifnot( e[2] == "latin1" )
+         cat("GOOD -- all encoding are as expected\n")
+ 
+ # write with client_encoding = 'LATIN1' and read back what was wrote
+         dbWriteTable(con, "texttable", x_df, overwrite = TRUE)
+         (x_db <- dbReadTable(con, "texttable"))
+         (e <- Encoding(x_db$x))
+         stopifnot( e[1] == "unknown" )
+         stopifnot( e[2] == "latin1" )
+         cat("GOOD -- all encoding are as expected\n")
+ 
+     dbRemoveTable(con, "texttable")
+     dbDisconnect(con)
+     dbUnloadDriver(drv)
+     cat("DONE\n")
+ }else{
+     cat("Skip because envirinmental variables are not set to tell the connection params.\n")
+ }
Skip because envirinmental variables are not set to tell the connection params.
> 
> proc.time()
   user  system elapsed 
   0.14    0.04    0.18