mamweb/db_compare.py

#!/usr/bin/python3

import psycopg2
import psycopg2.extras

OLD_DB = "mam_old"
NEW_DB = "mamweb"

oldconn = psycopg2.connect(f"dbname={OLD_DB}")
newconn = psycopg2.connect(f"dbname={NEW_DB}")

oldcur = oldconn.cursor(cursor_factory=psycopg2.extras.DictCursor)
newcur = newconn.cursor(cursor_factory=psycopg2.extras.DictCursor)


# Uses global variables oldcur, newcur!
def execute_simple(old_query, new_query=None):
	if new_query is None:
		new_query = old_query

	oldcur.execute(old_query)
	newcur.execute(new_query)

	if oldcur.rowcount != newcur.rowcount:
		raise ValueError(f"Queries '{old_query}' and '{new_query}' returned different number of rows ({oldcur.rowcount} and {newcur.rowcount})")

	return(oldcur.fetchall(), newcur.fetchall())

def check_same(old_row, new_row, old_fields, new_fields=None):
	if type(old_fields) != list:
		old_fields = [old_fields]

	if new_fields is None:
		new_fields = old_fields
	
	fields = zip(old_fields, new_fields)

	for old_field, new_field in fields:
		if old_row[old_field] == new_row[new_field]:
			continue
		raise ValueError(f"Fields '{old_field}' and '{new_field}' differs for rows '{old_row}' and '{new_row}'")
	return True



def check_skola():
	old_query = "SELECT * FROM seminar_skoly ORDER BY id"
	new_query = old_query

	old_res, new_res = execute_simple(old_query,new_query)

	res = zip(old_res,new_res)

	for o,n in res:
		check_same(o,n,['id','aesop_id','izo','nazev','kratky_nazev','ulice','mesto','psc','stat','je_zs','je_ss','poznamka'])

check_skola()