R Under development (unstable) (2024-09-21 r87186 ucrt) -- "Unsuffered Consequences"
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> ## dbListFields 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
> ##
> 
> ## 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))
+ 
+     ## 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))
+ 
+ 
+     #  create a table
+     res <- dbGetQuery(con, "CREATE SCHEMA testschema")
+     res <- dbGetQuery(con, "CREATE TABLE testschema.aa (pid integer, name text)")
+     res <- dbGetQuery(con, "CREATE TABLE aa (pk integer, v1 float not null, v2 float)" )
+ 
+     ## run a simple query and show the query result
+     df <- dbListFields(con, "aa")
+     print(df)
+     if (length(df) == 3){
+       cat("PASS: 3 fields returned\n")
+     }else{
+       cat(paste("FAIL:", length(df), "fields returned\n"))
+     } 
+ 
+     df <- dbListFields(con, c("testschema", "aa"))
+     print(df)
+     if (length(df) == 2){
+       cat("PASS: 2 fields returned\n")
+     }else{
+       cat(paste("FAIL:", length(df), "fields returned\n"))
+     } 
+ 
+ 
+     ## cleanup
+     cat("Removing \"AA\"\n")
+     dbRemoveTable(con, "aa")
+     dbGetQuery(con, "DROP TABLE testschema.aa")
+     dbGetQuery(con, "DROP SCHEMA testschema")
+     ## and disconnect
+     dbDisconnect(con)
+ }
> 
> proc.time()
   user  system elapsed 
   0.20    0.12    0.59