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Redshift database backend for Django

Project Description

This product is tested with:

  • python-2.7, 3.5, 3.6
  • django-1.8, 1.9, 1.10, 1.11

Differences from postgres_psycopg2 backend

Type mapping:

  • ‘integer identity(1, 1)’ for AutoField
  • ‘bigint identity(1, 1)’ for BigAutoField
  • ‘timestamp’ for DateTimeField
  • ‘varchar(max)’ for TextField
  • Possibility to multiply VARCHAR length to support utf-8 string, using REDSHIFT_VARCHAR_LENGTH_MULTIPLIER setting.

Stop using:

  • RETURNING (single insert and bulk insert)
  • SELECT FOR UPDATE
  • SET TIME ZONE
  • SET CONSTRAINTS
  • INDEX
  • DEFERRABLE INITIALLY DEFERRED
  • CONSTRAINT
  • DROP DEFAULT

To support migration:

  • To add column to existent table on Redshift, column must be nullable
  • To support modify column, add new column -> data migration -> drop old column -> rename

Please note that the migration support for redshift is not perfect yet.

Note and Limitation

Amazon Redshift doesn’t support RETURNING, so last_insert_id method retrieve MAX(pk) after insertion as a workaround.

refs:

In some case, MAX(pk) workaround does not work correctly. Bulk insertion makes non-contiguous IDs like: 1, 4, 7, 10, … and single insertion after such bulk insertion generates strange id value like 2 (smallest non-used id).

SETTINGS

ENGINE for DATABASES is ‘django_redshift_backend’. You can set the name in your settings.py as:

DATABASES = {
    'default': {
        'ENGINE': 'django_redshift_backend',
        'NAME': '<your database name>',
        'USER': '<your database username>',
        'PASSWORD': '<your database password>',
        'HOST': '<your database hostname>',
        'PORT': '5439',
    }
}
REDSHIFT_VARCHAR_LENGTH_MULTIPLIER:
Possibility to multiply VARCHAR length to support utf-8 string. Default is 1.

TESTING

Testing this package requires:

  • tox-1.8 or later
  • virtualenv-15.0.1 or later
  • pip-8.1.1 or later

and wheelhouse directory contains psycopg2 manylinux1 wheels for using in each tests.

LICENSE

Apache Software License

CHANGES

0.7 (2017-06-08)

  • Drop Python-3.4
  • Drop Django-1.7
  • Support Python-3.6
  • Support Django-1.11

0.6 (2016-12-15)

  • Fix crush problem when using bulk insert.

0.5 (2016-10-05)

  • Support Django-1.10
  • #9: Add support for BigAutoField. Thanks to Maxime Vdb.
  • Fix crush problem on sqlmigrate when field modified.

0.4 (2016-05-17)

  • Support Python-3.4 and 3.5
  • #7: Restore support django-1.7. Version 0.3 doesn’t support django-1.7.
  • #4: More compat with redshift: not use SET CONSTRAINTS. Thanks to Maxime Vdb.
  • #6: More compat with redshift: not use sequence reset query. Thanks to Maxime Vdb.
  • #5: Add REDSHIFT_VARCHAR_LENGTH_MULTIPLIER settings. Thanks to Maxime Vdb.
  • Support column type changing on migration.

0.3 (2016-05-14)

  • #3: more compat with Redshift (AutoField, DateTimeField, Index). Thanks to Maxime Vdb.
  • More compat with redshift: add TextField
  • More compat with redshift: not use DEFERRABLE, CONSTRAINT, DROP DEFAULT
  • More compat with redshift: support modify column

0.2.1 (2016-02-01)

  • “SET TIME_ZONE” warning is changed as debug log for ‘django.db.backend’ logger.

0.2 (2016-01-08)

  • Disable “SET TIME_ZONE” SQL execution even if settings.TIME_ZONE is specified.

0.1.2 (2015-06-5)

  • Support Django-1.8

0.1.1 (2015-03-27)

  • Disable “SELECT FOR UPDATE” SQL execution.

0.1 (2015-03-24)

  • Support Django-1.7
  • Support “INSERT INTO” SQL execution without “RETURNING” clause.
Release History

Release History

This version
History Node

0.7

History Node

0.6

History Node

0.5

History Node

0.4

History Node

0.3

History Node

0.2.1

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