Write Start/Stop events in your SQL logs.
Goal: provide a middleware that inserts start/stop annotations that would land on the SQL logs.
2014-12-08 09:33:58 CET LOG: duration: 0.174 ms statement: BEGIN 2014-12-08 09:33:58 CET LOG: duration: 0.502 ms statement: SET TIME ZONE 'UTC' 2014-12-08 09:33:58 CET LOG: duration: 0.053 ms statement: COMMIT 2014-12-08 09:33:58 CET LOG: duration: 0.228 ms statement: SHOW default_transaction_isolation 2014-12-08 09:33:58 CET LOG: duration: 0.043 ms statement: BEGIN 2014-12-08 09:33:58 CET LOG: duration: 0.354 ms statement: SELECT 'django_sql_log_demo.views.Index_START' 2014-12-08 09:33:58 CET LOG: duration: 1.221 ms statement: SELECT "dummy_article"."id", "dummy_article"."title", "dummy_article"."body" FROM "dummy_article" 2014-12-08 09:33:58 CET LOG: duration: 0.118 ms statement: SELECT 'django_sql_log_demo.views.Index_STOP' 2014-12-08 09:33:58 CET LOG: duration: 0.067 ms statement: ROLLBACK 2014-12-08 09:33:59 CET LOG: duration: 0.179 ms statement: BEGIN 2014-12-08 09:33:59 CET LOG: duration: 0.513 ms statement: SET TIME ZONE 'UTC' 2014-12-08 09:33:59 CET LOG: duration: 0.054 ms statement: COMMIT 2014-12-08 09:33:59 CET LOG: duration: 0.231 ms statement: SHOW default_transaction_isolation 2014-12-08 09:34:00 CET LOG: duration: 117.999 ms statement: DROP DATABASE "test_hello_world"
The available middleware has been tested only with Postgresql databases, but it should work with other SQL-based RDBMs.
Add this package to your requirements, and install it the usual way. You don’t have to add the application to the INSTALLED_APPS, there’s no model to sync.
Add the middleware like this:
MIDDLEWARE_CLASSES = ( 'django_sql_log.middleware.SQLLoggingMiddleware', # ... )
Although the order of the middlewares is not crucial, it is better to make sure that the middleware is near the first place in the list.
Log format string
By default, the log format string is:
In the demo site, this would result in:
for the START event in the log.
You can customize this format by adding the DJANGO_SQL_LOG_FORMAT to your settings. Available format variables are (with correspondance in the demo tests):
- module_name: django_sql_log_demo.views,
- func_name: Index,
- full_name: django_sql_log_demo.views.Index,
- phase: START or STOP,
If you want to run the test-suite, you must have a settings_pg.py file in your demo/django_sql_log_demo directory.
You can find an example file that you may copy, and amend with correct credentials to your Postgresql server. Please bear in mind that the database you’ll have to connect to must exist on this server, and that your PG user should be able to create / delete databases.
With tox installed, simply run the command tox. This should run the tests for Sqlite and postgresql environments, if ready.
Logging in Postgresql
For you information, logs are not activated by default in postgresql settings. To make sure your log file will display the START/STOP events, go edit your postgresql.conf file and set this variable:
log_min_duration_statement = 0
For other database systems, please refer to the official documentation.
This software is published under the terms of the MIT License. Please see the LICENSE file for more information.
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