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etl.py
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etl.py
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import configparser
from logging import getLogger
import psycopg2
from sql_queries import copy_table_queries, insert_table_queries
log = getLogger(__name__)
# CONFIG
config = configparser.ConfigParser()
config.read('dwh.cfg')
# DB_HOST = config.get('CLUSTER', 'DB_HOST')
# DB_NAME = config.get('DEFAULT', 'DB_NAME')
# DB_USER = config.get('S3', 'DB_USER')
# SONG_DATA = config.get('S3', 'SONG_DATA')
def load_staging_tables(cur, conn):
log.info("On loading staging tables")
for query in copy_table_queries:
log.info(f"On running this copy query: {query}")
cur.execute(query)
conn.commit()
def insert_tables(cur, conn):
log.info("On inserting into dimensions and fact tables")
for query in insert_table_queries:
log.info(f"On running this insert query: {query}")
cur.execute(query)
conn.commit()
def main():
config = configparser.ConfigParser()
config.read('dwh.cfg')
log.info("Getting database connection")
conn = psycopg2.connect("host={} dbname={} user={} password={} port={}".format(*config['CLUSTER'].values()))
log.info("Connection established")
cur = conn.cursor()
load_staging_tables(cur, conn)
insert_tables(cur, conn)
conn.close()
if __name__ == "__main__":
main()