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create_tables_run.py
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create_tables_run.py
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import configparser
import psycopg2
from CreateTables import CreateTables
def drop_tables(cur, conn):
'''Drops all tables in DWH
INPUT:
cur: A DB cursor object(has to be AWS Redshift based)
conn: A connection object to an AWS Redsahift cluster
'''
for t, query in zip(CreateTables.tabs, CreateTables.droptable_queries):
cur.execute(query)
print("{} dropped!".format(t))
conn.commit()
def create_tables(cur, conn):
'''Creates all necessary tables in DWH
INPUT:
cur: A DB cursor object(has to be AWS Redshift based)
conn: A connection object to an AWS Redsahift cluster
'''
for t, query in zip(CreateTables.tabs, CreateTables.createtable_queries):
cur.execute(query)
print("{} created!".format(t))
conn.commit()
def main():
config = configparser.ConfigParser()
config.read('dwh.cfg')
host = config["Red"]["DWH_HOST"]
dbn = config["Red"]["DWH_DB"]
user = config["Red"]["DWH_DB_USER"]
pw = config["Red"]["DWH_DB_PASSWORD"]
port = config["Red"]["DWH_PORT"]
conn = psycopg2.connect(f"host={host}\
dbname={dbn} \
user={user} password={pw} port={port}")
cur = conn.cursor()
drop_tables(cur, conn)
create_tables(cur, conn)
conn.close()
if __name__ == "__main__":
main()