Cases (Posts about sqlalchemy)

Reminder to use pool_recycle for SQLAlchemy's connection to mysql

Grzegorz Śliwiński — Tue, 19 Aug 2014 20:02:27 GMT

This post is a reminder to myself and maybe other that will stumble upon "Mysql server has gone away" error with SQLAlchemy.

Recently, we had problem again with MySQL and SQLAlchemy application, that it lost connection, resulting in this error. While a colleague of mine started panicking, I've started to remind myself, how did we solved it last time.

Well.. the answer is simple, we used pool_recycle because mysql closes itself stale connections.

I don't think this problem occurs with postgresql, at least I haven't seen it anywhere with postgresql, but for MySQL it's certainly worth trying first pool_recycle option, and tuning pooling in general, before franticly browsing internet for possible cause of this broad error.

Testing web applications using SQLAlchemy.

Grzegorz Śliwiński — Wed, 09 Apr 2014 21:13:57 GMT

Some time ago, I decided to refactor pyramid_fullauth tests from mostly unittest style (though run by py.test) to same factor function style tests and base them on pytest_pyramid package, when it comes to test webapp. Everhything went smoothly, until I stumbled upon SQLAlchemy session in tests.

SQLAlchemy 0.9 dialects speed tests

Grzegorz Śliwiński — Sun, 02 Feb 2014 21:14:23 GMT

This fourth SQLAlchemy's dialects speed tests aims to test this ORM's newest version, 0.9.x, which is available for about a month already. This version, amongst other improvements, contains C extension for python3.

Year's end SQLAlchemy speed tests on postgres and mysql

Grzegorz Śliwiński — Sun, 22 Dec 2013 13:11:33 GMT

This third SQLAlchemy speed tests for various dialects is my third try, prompted by Tony Locke. Tony is a contributor to pg8000 postgresql connector, which just recently got a huge overhaul and got a new version, after almost three years. I was happy to comply, as his request got me reason to work a little bit on my testing script as well, and automate the whole process.

SQLAlchemy speed tests on postgres and mysql

Grzegorz Śliwiński — Thu, 29 Aug 2013 18:27:50 GMT

10 months ago, I run sqlalchemy tests against mysql server on different mysql dialects. This time, I did the same, but for both postgres and mysql dialects.

sqlAlchemy speed tests on mysql-connector-python, mysqldb and oursql drivers

Grzegorz Śliwiński — Thu, 18 Oct 2012 21:10:15 GMT

Some time ago, I decided to check, how sqlalchemy will cope with different mysql drivers in terms of efficiency. At Red Sky, we used MySQLdb for all python projects, at least within our team. But MySQLdb requires mysql-client library, and does some compiling during installation.