This plugin uses usql to interact with databases using specific queries or your current main selection, so you should install it, I just do:

go install github.com/xo/usql@latest

First initialize your dsns

sqloverinit  [<db_name>=<db_dsn>]...

Then pick a db, the command will provide you suggestion based on the dsns you loaded

sqloverpickdb <db_name>

Query as you wish

sqloverdoq SELECT 69 FROM DUAL

Or leve it empty to use your selection as the command input

sqloverdoq

I just have this configured like this

plug "eko234/sqlover" config %{
  sqloverinit  mylocaldb=oracle://mydbname:mypassword@localhost:32770/ORCLCDB.localdomain
  alias global pdb sqloverpickdb
  map global user q ': sqloverdoq '
}

As I said, this thing uses usql under the hood, if you want to pass any additional flags you can modify the sqlovercmdoptions to do things like removing the json formatting, as this plugin sets it to '--json' by default, or even get also the stderr to the sqlover buffer so you know when and why things go wrong

  set global sqlovercmdoptions '--csv 2>&1'

I also developped geppeto for kakoune, which is a chat gpt interactive client that uses fifos, the ideas of querying and prompting with selections could be quite interesting to combine, so give it a shot.