# pip install my4geks
import gevent.monkey ; gevent.monkey.patch_all()
from my4geks import db, db_config, db_transaction

db_config.update(user='user', password='password', database='test')
    # Defaults: host='127.0.0.1', port=3306, pool_size=10, query_timeout=55, charset='utf8', cursor_class=AdictCursor.

def on_request(): # Inside a greenlet:

    item = db('SELECT * FROM `items` WHERE `id` = %s', item_id, charset='utf8mb4').row

    for item in db('SELECT `id`, `name` FROM `items` WHERE `name` IN %s, [value1, value2]).rows:
        print('{}\t{}'.format(item.id, item.name))

    assert db('UPDATE `items` SET `name` = %s WHERE `name` = %s', new_value, old_value).affected # rowcount

    def code():
        db('INSERT INTO `table1` (`quantity`) VALUES (%s)', -100)
        db('INSERT INTO `table2` (`quantity`) VALUES (%s)', +1/0)
    db_transaction(code)