Load ABS files to MySQL

When I am working in R, I tend to have my working data in a MySQL database. I found that R did not always play nicely (and quickly) with complex Microsoft Excel files.

Previously, I had quite a complex bit of python code to read Excel files and upload them to MySQL. I have now retooled the way in which I load files from the Australian Bureau of Statistics (ABS) to MySQL using Python pandas. The code is much simpler.

First, I store my MySQL database username and password in a file MysqlConnect.py (it is used by a number of different programs). It lives in the bin directory (../bin from where I do my work). And, just in case you are wondering: no, it is not my password.

host     = 'localhost'
user     = 'root'
password = 'BigRedCar'
database = 'dbase1'

Now let's move on to the function to load ABS files into MySQL. It lives in the bin directory (../bin from where I do my work), in a file named LoadABSToMySQL.py. 

import pandas as pd
import pymysql
from sqlalchemy import create_engine
import os.path
import re

# local imports - a file that contains database login details
import MysqlConnect as MSC

def LoadABSToMySQL(pathName):
    """ Read an Excel file from the Australian Bureau of Statistics
        and load it into a MySQL database"""

    # --- 1 --- open MySQL
    s = 'mysql+pymysql://'+MSC.user+':'+MSC.password+'@'+MSC.host+'/'+MSC.database
    engine = create_engine(s)

    # --- 2 --- identify proposed table name from file name
    (head,tail) = os.path.split(pathName)
    tail = re.split('\.', tail)
    tablename = tail[0]

    # --- 3 --- open the XL file
    wb = pd.ExcelFile(pathName)

    # --- 4 --- load XL workbooks into a single DataFrame
    df = pd.DataFrame()
    for name in wb.sheet_names:

        # -- ignore junk
        if not 'Data' in name:
            continue

        # -- read
        tmp = wb.parse(sheetname=name, header=9, index_col=0, na_values=['', '-', ' '])

        # -- amalgamate
        df = pd.merge(left=df, right=tmp, how='outer', left_index=True, right_index=True)
        tmp = None

    # --- 5 --- write this DataFrame to MySQL
    df.to_sql(tablename, engine, index=True, if_exists='replace')

Finally, an example code snippet to load some of the ABS National Account files to MySQL. This files sits in my national accounts directory and has the rather unimaginative name py-load.py. The ABS Microsoft Excel files live in the ./raw-data sub-directory.

import sys
sys.path.append( '../bin' )

from LoadABSToMySQL import LoadABSToMySQL

dataDirectory = './raw-data/'
dataFiles = [
    '5206001_key_aggregates',
    '5206002_expenditure_volume_measures',
    '5206003_expenditure_current_price',
    '5206004_expenditure_price_indexes',
    '5206006_industry_gva',
    '5206008_household_final_consumption_expenditure',
    '5206022_taxes',
    '5206023_social_assistance_benefits',
    '5206024_selected_analytical_series'
]
dataSuffix = '.xls'

for f in dataFiles :
    LoadABSToMySQL(dataDirectory + f + dataSuffix)

To run this python load file, I have a BASH shell script, which I use on my iMac. It has another unimaginative name: run-load.sh.

#!/bin/bash

# mac os x fix ...
cd "$(dirname "$0")"

python ./py-load.py

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