R Under development (unstable) (2024-01-07 r85787 ucrt) -- "Unsuffered Consequences"
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> 
> ## dbWriteTable test
> ##
> ## Assumes that
> ##  a) PostgreSQL is running, and
> ##  b) the current user can connect
> ## both of which are not viable for release but suitable while we test
> ##
> ## Dirk Eddelbuettel, 10 Sep 2009
> 
> ## 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))
+     stopifnot(require(datasets))
+ 
+     ## load the PostgresSQL driver
+     drv <- dbDriver("PostgreSQL")
+ 
+     ## create two independent connections
+     con1 <- 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))
+ 
+     con2 <- 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(con1, "rockdata")) {
+         cat("Removing rockdata\n")
+         dbRemoveTable(con1, "rockdata")
+     }
+ 
+     cat("begin transaction in con1\n")
+     dbGetQuery(con1, "BEGIN TRANSACTION")
+     cat("create table rockdata in con1\n")
+     dbWriteTable(con1, "rockdata", rock)
+     if (dbExistsTable(con1, "rockdata")) {
+         cat("PASS rockdata is visible through con1\n")
+     }else{
+         cat("FAIL rockdata is invisible through con1\n")
+     }
+     if (dbExistsTable(con2, "rockdata")) {
+         cat("FAIL rockdata is visible through con2\n")
+     }else{
+         cat("PASS rockdata is invisible through con2\n")
+     }
+     cat("commit in con1\n")
+     dbCommit(con1)
+     if (dbExistsTable(con2, "rockdata")) {
+         cat("PASS rockdata is visible through con2\n")
+     }else{
+         cat("FAIL rockdata is invisible through con2\n")
+     }
+ 
+     cat("remove the table from con1\n")
+     dbRemoveTable(con1, "rockdata")
+ 
+     if (dbExistsTable(con2, "rockdata")) {
+         cat("FAIL rockdata is visible through con2\n")
+     }else{
+         cat("PASS rockdata is invisible through con2\n")
+     }
+ 
+     cat("begin transaction in con1\n")
+     dbGetQuery(con1, "BEGIN TRANSACTION")
+     cat("create table rockdata in con1\n")
+     dbWriteTable(con1, "rockdata", rock)
+     if (dbExistsTable(con1, "rockdata")) {
+         cat("PASS rockdata is visible through con1\n")
+     }else{
+         cat("FAIL rockdata is invisible through con1\n")
+     }
+     cat("RollBack con1\n")
+     dbRollback(con1)
+     if (dbExistsTable(con1, "rockdata")) {
+         cat("FAIL rockdata is visible through con1\n")
+     }else{
+         cat("PASS rockdata is invisible through con1\n")
+     }
+ 
+     ## and disconnect
+     dbDisconnect(con2)
+     dbDisconnect(con1)
+ }
> 
> proc.time()
   user  system elapsed 
   0.14    0.06    0.18