data-management/exchange/extract/exchange_extract_function.py

import csv
from operator import concat
import mysql.connector
import os


def connect_mysql(config):
    try:  
        mydb = mysql.connector.connect(
        host      = config["host"],
        user      = config["user"],
        password  = config["password"],
        database  = config["database"])
        return mydb
    except Exception as e:
        print(e)
        print("[FUNCTION_ERROR]-connect_mysql")
        return False


def mysql_dict_sql_to_csv(SQL_DICT, path, mysqldb, mysqlcursor):
    temp_folder_path = path
    # Check whether the specified path exists or not
    temp_folder_path_isExist = os.path.exists(temp_folder_path)
    if not temp_folder_path_isExist:
        # Create a new directory because it does not exist 
        os.makedirs(temp_folder_path)
        print("[Create Folder] exchange_temp_extract_csv")

    for tablename,sql in SQL_DICT.items():

        try:
            mysqlcursor.execute(sql)
            mysqlresult = mysqlcursor.fetchall()
            mysqldbname = mysqldb.database

            filename = '/{}_{}.csv'.format(mysqldbname, tablename)
            headers = [col[0] for col in mysqlcursor.description] # get headers
            mysqlresult.insert(0, tuple(headers))
            with open(concat(path,filename), 'r') as infile, open(concat(path,filename), 'w') as outfile:    #REMOVE ALL |
                temp = infile.read().replace("|", "/")
                outfile.write(temp)
            fp = open(concat(path,filename), 'w', newline = '', encoding = 'utf-8-sig') 
            myFile = csv.writer(fp,delimiter='|',quotechar="'")
            myFile.writerows(mysqlresult)
            fp.close()

        except Exception as e:
            print(e)
            print("[FUNCTION_ERROR]-write_to_csv:" , filename)
            return False

        finally:
            print("[Download Complete]",filename)