Adds a comment to SQL queries pointing to their place of origin
Project description
django-sql-tagger
Adds a comment to SQL queries pointing to their place of origin
Usage
Install:
pip install django-sql-tagger
Configure and add to INSTALLED_APPS
in your settings.py
file:
INSTALLED_APPS = [
...
'django_sql_tagger',
...
]
SQL_TAGGER_CODE_ROOT = BASE_DIR
SQL_TAGGER_PATH_REPLACEMENTS = [
(r'^myapp/', 'a/'),
]
Settings
SQL_TAGGER_CODE_ROOT
- The root of your codebase. This is used to find out which stack frames belong to your
application code.
SQL_TAGGER_PATH_REPLACEMENTS
- A list of tuples of regular expressions and replacements. This is used to shorten
paths in the comments. For example, if you have a file at
/myapp/views.py
and you want to replace /myapp/
with a/
, you would add
(r'^myapp/', 'a/')
to the list.
Tagging precision
The tagger automatically adds comments to SQL queries, pointing to the place in the code where the query was executed.
It tries to be clever in finding the right stack frame. Therefore it ignores all stack frames that don't belong
to SQL_TAGGER_CODE_ROOT
and anything that subclasses Model
or QuerySet
.
If you have a utility method that you call from multiple places, you may want to ignore it by adding
@django_sql_tagger.ignore_below
to the method. This annotation makes django-sql-tagger look only at the stack frames
that were created before the annotated method was called.
Tagging transactions
This app monkey-patches transaction.atomic
, so no changes to your code are necessary. transaction.atomic
now accepts a tag
argument, which will be recorded in the comments of the SQL queries. Without a tag
, only
the filename and line number of the transaction.atomic()
call will be recorded.
Example
See the testsite/
directory for an example project using this package.
from django.core.management import BaseCommand
from django.db import connection, transaction
from testapp.models import Website
class Command(BaseCommand):
def handle(self, *args, **options):
Website.objects.first()
with transaction.atomic():
Website.objects.first()
with transaction.atomic():
with transaction.atomic():
Website.objects.first()
with transaction.atomic(tag='xxx'):
Website.objects.first()
The above command executes the following SQL queries:
/* ta/m/c/example.py:10 */ SELECT "testapp_website"."id", "testapp_website"."name", "testapp_website"."url" FROM "testapp_website"; args=(); alias=default
BEGIN;
/* ta/m/c/example.py:12 |> ta/m/c/example.py:13 */ SELECT "testapp_website"."id", "testapp_website"."name", "testapp_website"."url" FROM "testapp_website";
COMMIT;
BEGIN;
SAVEPOINT "s140328319196032_x1";
/* ta/m/c/example.py:15 |> ta/m/c/example.py:16 |> ta/m/c/example.py:17 */ SELECT "testapp_website"."id", "testapp_website"."name", "testapp_website"."url" FROM "testapp_website";
RELEASE SAVEPOINT "s140328319196032_x1";
COMMIT;
BEGIN;
/* T=xxx ta/m/c/example.py:19 |> ta/m/c/example.py:20 */ SELECT "testapp_website"."id", "testapp_website"."name", "testapp_website"."url" FROM "testapp_website";
COMMIT;
The comments make it easier to identify where the SQL queries are coming from, for example when you see the query in the database log or a database monitoring tool.
License
GPLv3 (see LICENSE
file)
Changelog
0.3.1
Include Manager
in the list of framework classes
0.3.0
Better precision for tags
- Ignore subclasses of Model and QuerySet
- Add annotation so the user can ignore utility functions
0.2.1
- Fix AttributeError: type object 'Command' has no attribute 'code'
0.2.0
- Monkey-patch
transaction.atomic
so all transactions are tagged by default
0.1.0
Initial release
Development
Install dependencies
pip install -e '.[dev]'
Run tests
cd testsite/
pytest
Release
- Update changelog in this file.
- Wait for tests to pass.
- Create a new release on GitHub. This will trigger a new job that will publish the package to PyPI.
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