PostgreSQL - Listen and Notify Clients In Real Time

26 min • 28 juni 2023

The promise of digital mapping is to provide a shared and real-time view of the state of the underlying system.

pg_eventserv is a free and open-source component that helps fulfill the promise of real-time event modeling and shared views in PostgreSQL.

By connecting to PostgreSQL and listening on specified channels, pg_eventserv captures database notifications and forwards them to web clients, enabling real-time updates and synchronization of data displayed on maps or other web interfaces.

pg_eventserv does one thing and one thing only: take events generated by the PostgreSQL NOTIFY command and passes the payload along to waiting WebSockets clients.

pg_eventserv is free and easy to install and you can find it here: https://github.com/CrunchyData/pg_eventserv

What this means is that any client can watch for notifications and update as changes in the database happen.

Real-time data!

Here is a link to a Youtube video demonstration of pg_eventserv in action!

https://youtu.be/UakRtYmoWow

I will let Paul Ramsey the creator of pg_eventserv explain all this in more detail in this episode.

If you want to reach out to Paul the best place to do that is http://blog.cleverelephant.ca/

Or if you want to listen to previous episodes with Paul you might find these interesting

Raster in the database?

https://mapscaping.com/podcast/rasters-in-a-database/

Dynamic Vector Tiles Straight From The Database

https://mapscaping.com/podcast/dynamic-vector-tiles-straight-from-the-database/