django-cockroachdb

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django-cockroachdb

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CockroachDB Backend for Django

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# CockroachDB backend for Django

## Prerequisites

You must install:

* [psycopg](https://pypi.org/project/psycopg/), which may have some
 prerequisites [depending on which version you use](https://www.psycopg.org/psycopg3/docs/basic/install.html).

You can also use either:

* [psycopg2](https://pypi.org/project/psycopg2/), which has some
  [prerequisites](https://www.psycopg.org/docs/install.html#prerequisites) of
  its own.

* [psycopg2-binary](https://pypi.org/project/psycopg2-binary/)

The binary package is a practical choice for development and testing but in
production it is advised to use the package built from sources.

## Install and usage

Use the version of django-cockroachdb that corresponds to your version of
Django. For example, to get the latest compatible release for Django 6.1.x:

`pip install django-cockroachdb==6.1.*`

The minor release number of Django doesn't correspond to the minor release
number of django-cockroachdb. Use the latest minor release of each.

Configure the Django `DATABASES` setting similar to this:

```python
DATABASES = {
    'default': {
        'ENGINE': 'django_cockroachdb',
        'NAME': 'django',
        'USER': 'myprojectuser',
        'PASSWORD': '',
        'HOST': 'localhost',
        'PORT': '26257',
        # If connecting with SSL, include the section below, replacing the
        # file paths as appropriate.
        'OPTIONS': {
            'sslmode': 'verify-full',
            'sslrootcert': '/certs/ca.crt',
            # Either sslcert and sslkey (below) or PASSWORD (above) is
            # required.
            'sslcert': '/certs/client.myprojectuser.crt',
            'sslkey': '/certs/client.myprojectuser.key',
            # If applicable
            'options': '--cluster={routing-id}',
        },
    },
}
```

If using Kerberos authentication, you can specify a custom service name in
`'OPTIONS'` using the key `'krbsrvname'`.

## Notes on Django fields

- `IntegerField` uses the same storage as `BigIntegerField` so `IntegerField`
  is introspected by `inspectdb` as `BigIntegerField`.

- `AutoField` and `BigAutoField` are both stored as
  [integer](https://www.cockroachlabs.com/docs/stable/int.html) (64-bit) with
  [`DEFAULT unique_rowid()`](https://www.cockroachlabs.com/docs/stable/functions-and-operators.html#id-generation-functions).

## Notes on Django QuerySets

- [`QuerySet.explain()`](https://docs.djangoproject.com/en/stable/ref/models/querysets/#explain)
  accepts `verbose`, `types`, `opt`, `vec`, and `distsql` options which
  correspond to [CockroachDB's parameters](https://www.cockroachlabs.com/docs/stable/explain.html#parameters).
  For example:

```python
   >>> Choice.objects.explain(opt=True, verbose=True)
   'scan polls_choice\n ├── columns: id:1 question_id:4 choice_text:2 votes:3\n ├── stats: [rows=1]\n ├── cost: 1.1\n ├── key: (1)\n ├── fd: (1)-->(2-4)\n └── prune: (1-4)'
   ```

## FAQ

## GIS support

To use `django.contrib.gis` with CockroachDB, use
`'ENGINE': 'django_cockroachdb_gis'` in Django's `DATABASES` setting.

## Disabling CockroachDB telemetry

By default, CockroachDB sends the version of django-cockroachdb that you're
using back to Cockroach Labs. To disable this, set
`DISABLE_COCKROACHDB_TELEMETRY = True` in your Django settings.

## Known issues and limitations in CockroachDB 26.3.x and earlier

- CockroachDB [can't disable constraint checking](https://github.com/cockroachdb/cockroach/issues/19444),
  which means certain things in Django like forward references in fixtures
  aren't supported.

- Migrations have some limitations. CockroachDB doesn't support:

- [changing column type if it's part of an index](https://go.crdb.dev/issue/47636)
   - dropping or changing a table's primary key

- The `Field.db_comment` and `Meta.db_table_comment` options aren't supported
  due to [poor performance](https://github.com/cockroachdb/cockroach/issues/95068).

- Unsupported database functions:
   - [`AnyValue`](https://github.com/cockroachdb/cockroach/issues/172590)
   - [`UUIDV7`](https://github.com/cockroachdb/cockroach/issues/97557)

- `UniqueConstraint.nulls_distinct` [isn't supported](https://github.com/cockroachdb/cockroach/issues/115836).

- Unsupported queries:
   - [Mixed type addition in SELECT](https://github.com/cockroachdb/django-cockroachdb/issues/19):
     `unsupported binary operator: <int> + <float>`
   - [The power() database function doesn't accept negative exponents](https://github.com/cockroachdb/django-cockroachdb/issues/22):
     `power(): integer out of range`
   - [sum() doesn't support arguments of different types](https://github.com/cockroachdb/django-cockroachdb/issues/73):
      `sum(): unsupported binary operator: <float> + <int>`
   - [greatest() doesn't support arguments of different types](https://github.com/cockroachdb/django-cockroachdb/issues/74):
     `greatest(): expected <arg> to be of type <type>, found type <other type>`
   - [`SmallAutoField` generates values that are too large for any corresponding foreign keys](https://github.com/cockroachdb/django-cockroachdb/issues/84).

- GIS:
   - Some database functions aren't supported: `AsGML`, `AsKML`, `AsSVG`,
     and `GeometryDistance`.
   - Some 3D functions or signatures aren't supported: `ST_3DExtent`,
     `ST_Scale`, and `ST_LengthSpheroid`.
   - The `Length` database function isn't supported on geodetic fields:
     [st_lengthspheroid(): unimplemented](https://github.com/cockroachdb/cockroach/issues/48968).
   - `Union` may crash with
     [unknown signature: st_union(geometry, geometry)](https://github.com/cockroachdb/cockroach/issues/49064).
   - These lookups aren't supported:
     - [contained (@)](https://github.com/cockroachdb/cockroach/issues/56124)
     - [exact/same_as (~=)](https://github.com/cockroachdb/cockroach/issues/57096)
     - [left (<<) and right (>>)](https://github.com/cockroachdb/cockroach/issues/57092)
     - [overlaps_left (&<), overlaps_right (&>), overlaps_above (&<|),
       overlaps_below (&>|)](https://github.com/cockroachdb/cockroach/issues/57098)
     - [strictly_above (|>>), strictly_below (<<|)](https://github.com/cockroachdb/cockroach/issues/57095)

## Known issues and limitations in CockroachDB 26.2.x and earlier

- GIS:
   - The `ST_3DPerimeter` function [isn't supported](https://github.com/cockroachdb/cockroach/issues/60871).
   - The spheroid argument of `ST_DistanceSpheroid`
     [isn't supported](https://github.com/cockroachdb/cockroach/issues/48922).

- Queries which use [division that yields a different
  type](https://github.com/cockroachdb/django-cockroachdb/issues/21) aren't
  supported: `unsupported binary operator: <int> / <int> (desired <int>)`

- The `BitXor` aggregate [isn't supported](https://github.com/cockroachdb/cockroach/issues/170352).

## Known issues and limitations in CockroachDB 24.3.x and earlier

- CockroachDB executes `ALTER COLUMN` queries asynchronously which is at
  odds with Django's assumption that the database is altered before the next
  migration operation begins. CockroachDB will give an error like
  `unimplemented: table <...> is currently undergoing a schema change` if a
  later operation tries to modify the table before the asynchronous query
  finishes.

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