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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)
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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")
+
+ ## 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, c("public", "rockdata"))) {
+ print("Removing rockdata\n")
+ dbRemoveTable(con, c("public", "rockdata"))
+ }
+
+ dbWriteTable(con, c("public", "rockdata"), rock)
+
+ ## run a simple query and show the query result
+ res <- dbGetQuery(con, "select * from public.rockdata limit 10")
+ print(res)
+
+
+ ## cleanup
+ if (dbExistsTable(con, c("public", "rockdata"))) {
+ print("Removing rockdata\n")
+ dbRemoveTable(con, c("public", "rockdata"))
+ }
+
+ ## and disconnect
+ dbDisconnect(con)
+ }
Loading required package: RPostgreSQL
Loading required package: DBI
row.names area peri shape perm
1 1 4990 2791.90 0.0903296 6.3
2 2 7002 3892.60 0.1486220 6.3
3 3 7558 3930.66 0.1833120 6.3
4 4 7352 3869.32 0.1170630 6.3
5 5 7943 3948.54 0.1224170 17.1
6 6 7979 4010.15 0.1670450 17.1
7 7 9333 4345.75 0.1896510 17.1
8 8 8209 4344.75 0.1641270 17.1
9 9 8393 3682.04 0.2036540 119.0
10 10 6425 3098.65 0.1623940 119.0
[1] "Removing rockdata\n"
[1] TRUE
>
> proc.time()
user system elapsed
0.459 0.037 0.525
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