when to disconnect and when to end a pg client or pool

Question

My stack is node, express and the pg module. I really try to understand by the documentation and some outdated tutorials. I dont know when and how to disconnect and to e

Answer 1

You shouldn't disconnect the pool on every query, connection pool is supposed to be used to have "hot" connections.

I usually have a global connection on startup and the pool connection close on (if) application stop; you just have to release the connection from pool every time the query ends, as you already do, and use the same pool also in the signup function.

Sometimes I need to preserve connections, I use a wrapper to the query function that checks if the connection is active or not before perform the query, but it's just an optimization.

In case you don't want to manage open/close connections/pool or release, you could try https://github.com/vitaly-t/pg-promise, it manage all that stuff silently and it works well.