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A context manager for printing Django SQL queries to the terminal

Project description

This package provides a simple context manager for Django applications that will output the SQL queries caused by a block of code to standard output.

(To pre-empt a common question: Django Debug Toolbar lets you see the queries caused by HTTP requests to your application, but often I want to track down the queries that are used in a management command or some other context than making requests in your browser; the show_queries context manager in this package helps in those other situations.)

If you have sqlparse installed, then the SQL will be pretty-printed to make them easier to read, so I’d recommend that you also do:

pip install sqlparse


from django_debug_queries import show_queries


    with show_queries():
        people = list(Person.objects.filter(date_of_birth__gt="2000-01-01") \
            .values('id', 'legal_name'))
        sessions = list(ParliamentarySession.objects.all())

This might output the following to standard output:

Number of queries: 2
  Query 0 (taking 0.003):
    SELECT "core_person"."id",
    FROM "core_person"
    WHERE "core_person"."date_of_birth" > '2000-01-01'
    ORDER BY "core_person"."sort_name" ASC
  Query 1 (taking 0.005):
    SELECT "core_parliamentarysession"."id",
    FROM "core_parliamentarysession"
    ORDER BY "core_parliamentarysession"."start_date" ASC
End of query output.

Other options

Long query strings can take a long time to pretty-print using sqlparse, so by default SQL that is longer that 2048 characters is not formatted; you can adjust that limit with the optional sqlparse_character_limit parameter, e.g.:

with show_queries(sqlparse_character_limit=8192):

If you are using multiple databases in your Django application, you can tell this to use a particular database with the optional db_alias parameter, e.g.

with show_queries(db_alias='my_other_db'):

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