Connecting R to postgreSQL database - sql

Question

I am trying to connect R to a postgreSQL database. He is what I have been trying in R:
require("RPostgreSQL")
pw<- {
"password"
}
# loads the PostgreSQL driver
drv <- dbDriver("PostgreSQL")
# creates a connection to the postgres database
# note that "con" will be used later in each connection to the database
con <- dbConnect(drv, dbname = "DBname",
host = "localhost", port = 5432,
user = "user", password = pw)
rm(pw) # removes the password
# check for the test_table
dbExistsTable(con, "test_table")
# FALSE >>> Should be true
I cannot figure out why it is not properly connecting to my database. I know that the database is on my computer as I can connect to it in the terminal and with pgAdmin4. Any help is greatly appreciated.
Thanks

Answer 1

I have had better success with the RPostgres package in combination with DBI and I know that RPostgreSQL just released a new version in May after no changes for a while. RPostgres is pretty active
## install.packages("devtools")
#devtools::install_github("RcppCore/Rcpp")
#devtools::install_github("rstats-db/DBI")
#devtools::install_github("rstats-db/RPostgres")
library(RPostgres)
library(DBI)
pw<- {
"password"
}
con <- dbConnect(RPostgres::Postgres()
, host='localhost'
, port='5432'
, dbname='DBname'
, user='user'
, password=pw)
rm(pw) # removes the password
dbExistsTable(con, "test_table")

Answer 2

install.packages("RPostgreSQL")
require("RPostgreSQL")
# this completes installing packages
# now start creating connection
con <- dbConnect(dbDriver("PostgreSQL"),
dbname = "dbname",
host = "localhost",
port = 5432,
user = "db_user",
password = "db_password")
# this completes creating connection
# get all the tables from connection
dbListTables(con)

Answer 3

One issue could be table permission
GRANT ALL PRIVILEGES ON your_table TO user
Replace your_table and user with your own credentials
You can get table from \dt and user from \du