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create_tables.py
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import configparser
import psycopg2
from sql_queries import create_table_queries, drop_table_queries
from tqdm import tqdm
def drop_tables(cur, conn):
"""
Drops each table using the queries in `drop_table_queries` list.
"""
for query in tqdm(drop_table_queries, ascii=True):
cur.execute(query)
conn.commit()
def create_tables(cur, conn):
"""
Creates each table using the queries in `create_table_queries` list.
"""
for query in tqdm(create_table_queries, ascii=True):
cur.execute(query)
conn.commit()
def main():
"""
- Drops (if exists) and Creates the sparkify database.
- Establishes connection with the sparkify database and gets
cursor to it.
- Drops all the tables.
- Creates all tables needed.
- Finally, closes the connection.
"""
config = configparser.ConfigParser()
config.read('dwh.cfg')
conn = psycopg2.connect("host={} dbname={} user={} password={} port={}".format(*config['CLUSTER'].values()))
cur = conn.cursor()
drop_tables(cur, conn)
create_tables(cur, conn)
conn.close()
if __name__ == "__main__":
main()