[Question] Is there a capability to connect to multiple databases

Django provides a capability to define DATABASE_ROUTERS in settings.

• It gives you a capability to define alias names in DATABASES for primary, replica*(1,2,3… so on).
• you can customize the connection to read from replicas whereas write only to primary.
• QuerySet object also provides assistance for this setting. https://docs.djangoproject.com/en/3.2/topics/db/multi-db/

Is there such a definition in piccolo to connect to multiple instances (or databases) and accordingly read and write queries can be split for efficiency? Did not find anything in the docs.

[dantownsend]

I’ve implemented a first version - will release it now. There’s future scope for adding routers etc like in Django, but hopefully this helps.

[dantownsend]

@satishdash Yeah, we can definitely build on top of it.

Something like this perhaps:

DB = PostgresEngine(
    config={...},
    extra_nodes={
        'read_slave_1': PostgresEngine(config={...})
    },
    routing={
        'get': {'some_table': 'read_slave_1'}
    }
)

Once an API design has been settled on, it shouldn’t be too hard to implement. If you have any ideas for an API let me know.