# file dbcreate.py
from metadb import db
class tableName(metaclass = db): # создает таблицу tableName в mysql
    vkid = 0    # создает поля
    name = ''
    money = 0

# file message_send.py
def main(app, db):
    tn = db.tableName(12323, 'Visya') #insert если нету и возратить select
    tn.name = 'Petya'
    tn.money += 100
    tn.update()

    #или лучше классику
    row = db('select * from tableName where vkid=12323 limit 1')[0]
    if not row:
        db('insert into tableName(vkid, name, money) value(12323, "Visya")')
        row = db('select * from tableName where vkid=12323 limit 1')[0]
    row['name'] = 'Petya'
    row['money'] += 100
    db(f'update tableName set name="{row["name"]}", money={row["money"]} where vkid=12323 limit 1')