Clojurians Log v2

Is this example from the Lacinia tutorial (https://lacinia.readthedocs.io/en/latest/tutorial/database-1.html)

(defn ^:private pooled-data-source
  [host dbname user password port]
  {:datasource
   (doto (ComboPooledDataSource.)
     (.setDriverClass "org.postgresql.Driver" )
     (.setJdbcUrl (str "jdbc:postgresql://" host ":" port "/" dbname))
     (.setUser user)
     (.setPassword password))})

Using the c3po connection pool https://www.mchange.com/projects/c3p0/#using_combopooleddatasource

I noticed it only makes one connection with the database

When using Hikari I immediately see 10 connections

But maybe c3po works different

Anything specific you have doubts about? Jdbc-next has support for a pooled data source baked in and is more future proof. But apart from that I don't see anything strange.

You could try #sql jdbc.next supports both https://github.com/seancorfield/next-jdbc/blob/master/doc/getting-started.md#connection-pooling I don't know the differences, but did see the same behaviour using hikari.