Please show any errors you are getting.

As shown in the image, I connected through the log console, in the railway data it says no

Does the database have a TCP Proxy? send a screenshot of its public networking section please.

This one?

Without the scribble please.

I believe I have to connect this proxy, now how?In my code?

please teach me how to connect proxy

You need to connect to the database with it's database url variable.

this is the variable mysql://${{root}}:${{RuXnKeyytJqWvgyJCPOFsWqcShahoHyZ}}@${{viaduct.proxy.rlwy.net}}:${{25760}}/${{railway}}

Do I use it as this way to connect?
mysql -h viaduct.proxy.rlwy.net -u root -p -P 25760

how to connect?

Please have patience as this is community support.

I recommend familiarizing yourself with the technologies involved, how to connect to a database would not be directly related to Railway and thus the forum is going a bit out of scope.