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R version 3.3.1 (2016-06-21) -- "Bug in Your Hair"
Copyright (C) 2016 The R Foundation for Statistical Computing
Platform: x86_64-pc-linux-gnu (64-bit)
R is free software and comes with ABSOLUTELY NO WARRANTY.
You are welcome to redistribute it under certain conditions.
Type 'license()' or 'licence()' for distribution details.
R is a collaborative project with many contributors.
Type 'contributors()' for more information and
'citation()' on how to cite R or R packages in publications.
Type 'demo()' for some demos, 'help()' for on-line help, or
'help.start()' for an HTML browser interface to help.
Type 'q()' to quit R.
> ## 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)
+ }
Loading required package: RPostgreSQL
Loading required package: DBI
[1] "pk" "v1" "v2"
PASS: 3 fields returned
[1] "pid" "name"
PASS: 2 fields returned
Removing "AA"
[1] TRUE
>
> proc.time()
user system elapsed
0.458 0.032 0.547
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