
R version 3.3.1 (2016-06-21) -- "Bug in Your Hair"
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> 
> ## Test of date and datetime types, based on earlier version in inst/devTests
> ##
> ## Dirk Eddelbuettel, 21 Oct 2008
> 
> dbTypeTests <- function(con, dateclass="timestamp without time zone") {
+     cat("\n\n**** Trying with ", dateclass, "\n")
+ 
+     if (dbExistsTable(con, "tempostgrestable"))
+         dbRemoveTable(con, "tempostgrestable")
+ 
+     dbGetQuery(con, paste("create table tempostgrestable (tt ", dateclass, ", zz integer);", sep=""))
+     dbGetQuery(con, "insert into tempostgrestable values('2008-07-01 14:15:16.123', 1);")
+ 
+     now <- ISOdatetime(2000,1,2,3,4,5.678)
+     dbGetQuery(con, paste("insert into tempostgrestable values('", format(now), "', 2);", sep=""))
+ 
+     res <- dbReadTable(con, "tempostgrestable")
+     print(res)
+ 
+     res <- dbSendQuery(con, "select tt from tempostgrestable;")
+     data <- fetch(res, n=-1)
+     print(dbColumnInfo(res))
+ 
+     times <- data[,1]
+     print(times)
+     print(class(times[1]))
+ 
+     print(diff(times))
+ 
+     dbRemoveTable(con, "tempostgrestable")
+     invisible(NULL)
+ }
> 
> ## only run this if this env.var is set correctly
> 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))
+ 
+     ## Force a timezone to make the tests comparable at different locations
+     Sys.setenv("PGDATESTYLE"="German")
+     Sys.setenv("TZ"="UTC")
+ 
+     ## 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))
+ 
+     dbTypeTests(con, "timestamp")
+ #    dbTypeTests(con, "timestamp with time zone")
+ # output differs depending on the compute environment
+     dbTypeTests(con, "date")
+ 
+     dbDisconnect(con)
+ }
Loading required package: RPostgreSQL
Loading required package: DBI


**** Trying with  timestamp 
                   tt zz
1 2008-07-01 14:15:16  1
2 2000-01-02 03:04:05  2
  name  Sclass      type len precision scale nullOK
1   tt POSIXct TIMESTAMP   8        -1    -1   TRUE
[1] "2008-07-01 14:15:16 UTC" "2000-01-02 03:04:05 UTC"
[1] "POSIXct" "POSIXt" 
Time difference of -3103.466 days


**** Trying with  date 
          tt zz
1 2008-07-01  1
2 2000-01-02  2
  name Sclass type len precision scale nullOK
1   tt   Date DATE   4        -1    -1   TRUE
[1] "2008-07-01" "2000-01-02"
[1] "Date"
Time difference of -3103 days
[1] TRUE
> 
> 
> proc.time()
   user  system elapsed 
  0.500   0.040   0.586 
