R Under development (unstable) (2024-01-07 r85787 ucrt) -- "Unsuffered Consequences"
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> ## Test of data types, based on earlier version in inst/devTests
> ##
> ## Dirk Eddelbuettel, 21 Oct 2008
> 
> 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")
+     ## can't print result as it contains process id which changes  print(summary(drv))
+ 
+     ## 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, "tempostgrestable"))
+         dbRemoveTable(con, "tempostgrestable")
+ 
+     ## Test the numeric mapping
+     dbGetQuery(con, "create table tempostgrestable (intcolumn date, floatcolumn timestamp with time zone);")
+ 
+     sql <- paste("insert into tempostgrestable ",
+                  "values ('2011-03-07', '2011-03-07 16:30:39') ")
+     res <- dbGetQuery(con, sql)
+ 
+     dat <- dbReadTable(con, "tempostgrestable")
+     dbRemoveTable(con, "tempostgrestable")
+     cat("Read Date and TIMESTAMP values\n")
+ 
+     ## now test the types of the colums we got
+     if( class(dat[1,1]) == "Date" ){
+         cat("PASS -- Date type is as expected\n")
+     }else{
+         cat("FAIL -- Date type is other than Date: ")
+         cat(class(dat[1,1]))
+         cat("\n")
+     }
+     if( class(dat[1,2])[1] == "POSIXct" ){
+         cat("PASS -- TIMESTAMP is received as POSIXct\n")
+     }else{
+         cat("FAIL -- TIMESTAMP is other than POSIXct: ")
+         cat(class(dat[1,2]))
+         cat("\n")
+     }
+ 
+     dbWriteTable(con, "tempostgrestable2", dat)
+     dat2 <- dbReadTable(con, "tempostgrestable2")
+     dbRemoveTable(con, "tempostgrestable2")
+     cat("Check that read after write gets the same data types\n")
+ 
+     ## now test the types of the colums we got
+     if( class(dat2[1,1]) == "Date" ){
+         cat("PASS -- Date type is as expected\n")
+     }else{
+         cat("FAIL -- Date type is other than Date: ")
+         cat(class(dat2[1,1]))
+         cat("\n")
+     }
+     if( class(dat2[1,2])[1] == "POSIXct" ){
+         cat("PASS -- TIMESTAMP is received as POSIXct\n")
+     }else{
+         cat("FAIL -- TIMESTAMP is other than POSIXct: ")
+         cat(class(dat2[1,2]))
+         cat("\n")
+     }
+ 
+ 
+     dbDisconnect(con)
+     dbUnloadDriver(drv)
+ 
+     cat("DONE\n")
+ }
> 
> proc.time()
   user  system elapsed 
   0.14    0.03    0.15