
R version 3.3.1 (2016-06-21) -- "Bug in Your Hair"
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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, "rockdata")) {
+         print("Removing rockdata\n")
+         dbRemoveTable(con, "rockdata")
+     }
+     cat("create incompatible table rockdata\n")
+     dbGetQuery(con, "CREATE TABLE rockdata (a int, b varchar(5))")
+ 
+     cat("write table to rockdata with append=TRUE\n")
+     try({res <-dbWriteTable(con, 'rockdata', rock, append=TRUE, overwrite=FALSE)
+         print(res)
+         if(res == FALSE){
+            cat("PASS as the return value is false\n")
+         }else{
+            cat("FAIL as the return value is true\n")
+         }
+     })
+ 
+     cat("write table to rockdata\n")
+     try({res <- dbWriteTable(con, 'rockdata', rock)
+         if(res == FALSE){
+         print(res)
+            cat("PASS as the return value is false\n")
+         }else{
+            cat("FAIL as the return value is true\n")
+         }
+     })
+   
+     ## run a simple query and show the query result
+     res <- dbGetQuery(con, "select * from rockdata limit 10")
+     print(res)
+ 
+ 
+     ## cleanup
+     if (dbExistsTable(con, "rockdata")) {
+         print("Removing rockdata\n")
+         dbRemoveTable(con, "rockdata")
+     }
+ 
+     ## and disconnect
+     dbDisconnect(con)
+ }
Loading required package: RPostgreSQL
Loading required package: DBI
create incompatible table rockdata
write table to rockdata with append=TRUE
Error in postgresqlpqExec(new.con, sql4) : 
  RS-DBI driver: (could not Retrieve the result : ERROR:  column "row.names" of relation "rockdata" does not exist
)
write table to rockdata
[1] FALSE
PASS as the return value is false
data frame with 0 columns and 0 rows
[1] "Removing rockdata\n"
[1] TRUE
Warning message:
In postgresqlWriteTable(conn, name, value, ...) :
  table rockdata exists in database: aborting assignTable
> 
> proc.time()
   user  system elapsed 
  0.473   0.035   0.519 
