README.rst

Tornado-MySQL

Contents

• WARNING
• Example
  • example
  • example_pool
• Requirements
• Installation
• Test Suite
• Resources
• License

This package contains a fork of PyMySQL supporting Tornado.

WARNING

This library is experimental and unmaintained. Don't use for production unless you can fix problem yourself.

If you think async is efficient, you're wrong. You shoud try thread pool before this. See also: http://techspot.zzzeek.org/2015/02/15/asynchronous-python-and-databases/

I don't have motivation to maintain this library. I won't add new features. Please don't send feature request. I'm very lazy about fix bugs. Don't expect bugs are fixed when you want.

Instead, you should use your time and energy to port your project to asyncio and newest Python 3. Please don't pay your time for this project.

You can use aio-libs/aiomysql or run_in_executor() in asyncio.

Example

example

#!/usr/bin/env python
from __future__ import print_function

from tornado import ioloop, gen
import tornado_mysql

@gen.coroutine
def main():
    conn = yield tornado_mysql.connect(host='127.0.0.1', port=3306, user='root', passwd='', db='mysql')
    cur = conn.cursor()
    yield cur.execute("SELECT Host,User FROM user")
    print(cur.description)
    for row in cur:
       print(row)
    cur.close()
    conn.close()

ioloop.IOLoop.current().run_sync(main)

example_pool

#!/usr/bin/env python
from __future__ import print_function

from tornado import ioloop, gen
from tornado_mysql import pools


pools.DEBUG = True


POOL = pools.Pool(
    dict(host='127.0.0.1', port=3306, user='root', passwd='', db='mysql'),
    max_idle_connections=1,
    max_recycle_sec=3)


@gen.coroutine
def worker(n):
    for i in range(10):
        t = 1
        print(n, "sleeping", t, "seconds")
        cur = yield POOL.execute("SELECT SLEEP(%s)", (t,))
        print(n, cur.fetchall())


@gen.coroutine
def main():
    workers = [worker(i) for i in range(10)]
    yield workers


ioloop.IOLoop.current().run_sync(main)
print(POOL._opened_conns)

Requirements

• Python -- one of the following:
  • CPython 2.7 or >= 3.3
  • PyPy >= 2.3.1
• MySQL Server -- one of the following:
  • MySQL >= 4.1
  • MariaDB >= 5.1

Installation

The last stable release is available on PyPI and can be installed with pip:

$ pip install Tornado-MySQL

Test Suite

If you would like to run the test suite, first copy the file .travis.databases.json to tornado_mysql/tests/databases.json and edit the new file to match your MySQL configuration:

$ cp .travis.databases.json tornado_mysql/tests/databases.json
$ $EDITOR tornado_mysql/tests/databases.json

To run all the tests, execute the script runtests.py:

$ python runtests.py

A tox.ini file is also provided for conveniently running tests on multiple Python versions:

$ tox

Resources

DB-API 2.0: http://www.python.org/dev/peps/pep-0249

MySQL Reference Manuals: http://dev.mysql.com/doc/

MySQL client/server protocol: http://dev.mysql.com/doc/internals/en/client-server-protocol.html

PyMySQL mailing list: https://groups.google.com/forum/#!forum/pymysql-users

License

PyMySQL is released under the MIT License. See LICENSE for more information.