Created
January 23, 2019 16:16
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Load data from S3 to Redshift using Python3
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############ REQUIREMENTS TO INSTALL #################### | |
# THIS SCRIPT use category table from AWS sample data (https://docs.aws.amazon.com/redshift/latest/gsg/rs-gsg-create-sample-db.html) | |
# we use this sample data s3://awssampledbuswest2/tickit/category_pipe.txt | |
###### Linux users | |
#`sudo apt-get install libpq-dev` | |
###### Mac users | |
#`brew install libpq` | |
###### ALL USERS | |
#pip3 install psycopg2-binary | |
#pip3 install sqlalchemy | |
#pip3 install sqlalchemy-redshift | |
########################################################### | |
import sqlalchemy as sa | |
from sqlalchemy.orm import sessionmaker | |
#>>>>>>>> MAKE CHANGES HERE <<<<<<<<<<<<< | |
DATABASE = "dwtest" | |
USER = "youruser" | |
PASSWORD = "yourpassword" | |
HOST = "dwtest.awsexample.com" | |
PORT = "5439" | |
SCHEMA = "public" | |
S3_FULL_PATH = 's3://yourbucket/category_pipe.txt' | |
ARN_CREDENTIALS = 'arn:aws:iam::YOURARN:YOURROLE' | |
REGION = 'us-east-1' | |
############ CONNECTING AND CREATING SESSIONS ############ | |
connection_string = "redshift+psycopg2://%s:%s@%s:%s/%s" % (USER,PASSWORD,HOST,str(PORT),DATABASE) | |
engine = sa.create_engine(connection_string) | |
session = sessionmaker() | |
session.configure(bind=engine) | |
s = session() | |
SetPath = "SET search_path TO %s" % SCHEMA | |
s.execute(SetPath) | |
########################################################### | |
############ RUNNING COPY ############ | |
copy_command = ''' | |
copy category from '%s' | |
credentials 'aws_iam_role=%s' | |
delimiter '|' region '%s'; | |
''' % (S3_FULL_PATH, ARN_CREDENTIALS, REGION) | |
s.execute(copy_command) | |
s.commit() | |
###################################### | |
############ GETTING DATA ############ | |
query = "SELECT * FROM category;" | |
rr = s.execute(query) | |
all_results = rr.fetchall() | |
def pretty(all_results): | |
for row in all_results : | |
print("row start >>>>>>>>>>>>>>>>>>>>") | |
for r in row : | |
print(" ---- %s" % r) | |
print("row end >>>>>>>>>>>>>>>>>>>>>>") | |
pretty(all_results) | |
s.close() | |
###################################### |
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