import configparser
import psycopg2
from sql_queries import create_table_queries, drop_table_queries


def drop_tables(cur, conn):
    """
    Drops all tables
    @type cur -- object
    @param cur -- cursor object

    @type conn -- object
    @param conn -- database connection object
    """
    for query in drop_table_queries:
        cur.execute(query)
        conn.commit()


def create_tables(cur, conn):
    """
    Creates all tables
    @type cur -- object
    @param cur -- cursor object

    @type conn -- object
    @param conn -- database connection object
    """
    for query in create_table_queries:
        cur.execute(query)
        conn.commit()


def main():
    """
    parses config file, connects to PG database, executes function that drops and creates tables on redshift
    """
    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()
import configparser
import psycopg2
from sql_queries import create_table_queries, drop_table_queries


def drop_tables(cur, conn):
    """
    Drops all tables
    @type cur -- object
    @param cur -- cursor object

    @type conn -- object
    @param conn -- database connection object
    """
    for query in drop_table_queries:
        cur.execute(query)
        conn.commit()


def create_tables(cur, conn):
    """
    Creates all tables
    @type cur -- object
    @param cur -- cursor object

    @type conn -- object
    @param conn -- database connection object
    """
    for query in create_table_queries:
        cur.execute(query)
        conn.commit()


def main():
    """
    parses config file, connects to PG database, executes function that drops and creates tables on redshift
    """
    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()
Drops all tables     @type cur -- object     @param cur -- cursor object      @type conn -- object     @param conn -- database connection object Creates all tables     @type cur -- object     @param cur -- cursor object      @type conn -- object     @param conn -- database connection object parses config file, connects to PG database, executes function that drops and creates tables on redshift