如何将变更从中间件传递到socket.io?

I am using node.js with socket.io to push real time notifications to users. However, currently I am just sending back a query result done in my socket.io code and sending it back to the client but I need to let socket know about the changes that occur and to either update with the changes or re-query the db to check for the new number and send that to the client. I am using node.js with socket.io to push real