add a script to create a sql file to update emails from csv list

Author: NicolasCARPi

examples/16-update-users-emails.py

@@ -0,0 +1,34 @@
+#!/usr/bin/env python
+
+###############
+# DESCRIPTION #
+##############
+#
+# This script will read a csv file that contains a list of emails to update,
+# with a column "old_email" that exist in the database, and a column
+# "new_email" with the value that we want to push to the database.
+# It will then generate a .sql file to update these values directly in the database.
+
+# we will use the generic csv module
+import csv
+
+CSV_PATH = './data/users-emails.csv'
+OUTPUT_PATH = './update-emails.sql'
+OLD_EMAIL_COLUMN = 'old_email'
+NEW_EMAIL_COLUMN = 'new_email'
+
+with open(OUTPUT_PATH, 'w') as outfile:
+    pass  # This just to clear any previous content
+
+# Note: use encoding='utf-8-sig' in the open() call if your file has BOM (Byte Order Mark)
+# Also make sure that the CSV file was saved as UTF-8 to avoid issues with special characters
+with open(CSV_PATH, newline='') as csvfile:
+    # let's read the CSV using the standard "csv" library from python. No need for anything fancier.
+    csvreader = csv.DictReader(csvfile, delimiter=',', quotechar='"')
+    with open(OUTPUT_PATH, 'a') as outfile:
+    # now we loop over each row in our CSV
+        for row in csvreader:
+            line = f"UPDATE users SET email = '{row[NEW_EMAIL_COLUMN]}' WHERE email = '{row[OLD_EMAIL_COLUMN]}';\n"
+            outfile.write(line)
+
+print(f'SQL file written to {OUTPUT_PATH}')

examples/data/users-emails.csv

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+old_email,new_email,another column
+[email protected],[email protected],Yes
+[email protected],[email protected],Nope
+[email protected],[email protected],
+[email protected],[email protected],This email doesn’t exist in the database