Warning

Prerequisites

If your database is behind a firewall, you might have to contact your IT team to allow the connection from Domino. Contact us for more information, or to set up a meeting with your team to work out the details.
Domino recommends storing your database username and password as environment variables in your project. This lets you access them at runtime without including them in your code.

Python

To establish a connection to Redshift with the psycopg2 library:

import psycopg2
import os

HOST = os.environ['REDSHIFT_HOST']
PORT = 5439 # redshift default
USER = os.environ['REDSHIFT_USER']
PASSWORD = os.environ['REDSHIFT_PASSWD']
DATABASE = 'mydatabase'

def db_connection():
    conn = psycopg2.connect(
        host=HOST,
        port=PORT,
        user=USER,
        password=PASSWORD,
        database=DATABASE,
    )
    return conn

example_query = "SELECT * FROM my_table LIMIT 5"

conn = db_connection()
try:
    cursor = conn.cursor()
    cursor.execute(example_query)
    results = cursor.fetchall() # careful, the results could be huge
    conn.commit()
    print results
finally:
    conn.close()

# using pandas
import pandas as pd
conn = db_connection()
try:
    df = pd.read_sql(example_query, conn)
    df.to_csv('results/outfile.csv', index=False)
finally:
    conn.close()

R

To establish a connection to Redshift with the RPostgreSQL library:

install.packages("RPostgreSQL")
library(RPostgreSQL)

redshift_host <- Sys.getenv("REDSHIFT_HOST")
redshift_port <- "5439"
redshift_user <- Sys.getenv("REDSHIFT_USER")
redshift_password <- Sys.getenv("REDSHIFT_PASSWORD")
redshift_db <- "mydatabase"

drv <- dbDriver("PostgreSQL")
conn <- dbConnect(
    drv,
    host=redshift_host,
    port=redshift_port,
    user=redshift_user,
    password=redshift_password,
    dbname=redshift_db)

tryCatch({
    example_query <- "SELECT * FROM my_table LIMIT 5"
    results <- dbGetQuery(conn, example_query)
    print(results)
}, finally = {
    dbDisconnect(conn)
})

Connect to Redshift

Prerequisites

Python

R