Clojurians Log v2
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datalevin
cjohansen 2026-01-17T21:05:15.270039Z
How can I access the datalevin schema? In Datomic, the schema is queryable, and in Datascript it's directly accessible from the connection (and from entities). Does Datalevin have something similar? I want to dynamically find unique attributes etc.
cjohansen 2026-01-18T08:59:02.063269Z
Perfect, thanks!
cjohansen 2026-01-18T09:05:46.437309Z
Is there some way to get the schema from the database value as well, or only the connection?
Huahai 2026-01-18T17:00:32.127389Z
In Datalevin, DB is.not a value (not an immutable DB). You can get schema from DB by calling (datalevin.db/-schema db)
cjohansen 2026-01-18T18:09:38.514049Z
Thanks. If the DB isn't a value, what's the difference between a connection and a DB?
Huahai 2026-01-18T19:10:54.788219Z
connection is just an atom holding the DB. connection is the level we do with-transaction , where callback listeners are registered, and where asynchronous transaction is done. Basically, it provides a level of indirection for us to do extra things.
Huahai 2026-01-18T19:17:43.600569Z
When I say DB is not a value, it doesn't mean we have only one DB instance that we bash upon, we do change DB instances when you transact, however, you should not expect a same DB instance gives you the same data.
Huahai 2026-01-17T22:56:23.697729Z
https://cljdoc.org/d/datalevin/datalevin/0.9.27/api/datalevin.core#schema