Listener that runs all the given listeners. The first one is the outermost: it wraps the execution as wrapped by the second one, and so on.

Listener that logs how long each SQL action took, together with its SQL statements, to the slick.basic.BasicBackend.timing logger at debug level, e.g. SQL action took 1.234 ms: select .... Failed and canceled actions are logged as failed after and was canceled after. The time is measured around the whole action, so it can include waiting for a connection. Nothing is measured unless that logger is enabled at debug level.

Slick fuses synchronous actions that are combined with >>, DBIO.seq, zip, asTry and similar combinators into one action that runs in one step. Such an action is logged on one line with its total time and the statements of all SQL actions in it, joined with ; .

For db.stream, the line SQL stream opened after ... covers opening the stream, that is running the query until the first rows can be read, but not reading the rows.

The default listener of every backend already includes this one. Combine it with your own listener to keep the timing log when you install one, e.g. ActionListener.combine(myListener, ActionListener.timing[IO]).