issue_comments: 537716955

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https://github.com/simonw/datasette/issues/283#issuecomment-537716955 https://api.github.com/repos/simonw/datasette/issues/283 537716955 MDEyOklzc3VlQ29tbWVudDUzNzcxNjk1NQ== 9599 2019-10-02T23:02:15Z 2019-10-02T23:02:15Z OWNER

I've been thinking pretty hard about this as part of #569. My big concerns are:

  • If I'm caching and reusing connections I need to worry about the different combinations - if I have four databases do I cache separate connections for the ("one", "two") AND ("two", "three") AND ("one", "three") and so on pairs?
  • How does the API and interface deal with instances where you have a database connected as the primary and you want to ATTACH another database and talk to that as well?

I think the best way to do this is to say that cross-database joins will only be available against the :memory: database. Maybe with an optional mode you can run like datasette --crossdb which causes every database to be ATTACHd to that connection with an alias so you can start running queries.

If this proves to be a problem when hundreds of files are attached to a Datasette Library instance (#417) then maybe cross database joins are handled (in that case) by the authenticated user selecting which ones to ?_attach= and detaching them at the end of the request. Also perhaps limit to joining across a maximum of 3 databases at once in this case.

I can probably avoid the scariest negative consequences of cross-database joins by having them turned off by default for signed-out users. The datasette-on-my-laptop or authenticated Datasette Library cases can be opt-in and can be a little less locked down.

 
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