Where query url FIlter

What do I have to do to make a UrlParameter in the select dynamic.

I call up the page and there is still no UrlParameter

now the select looks like this:

select * from User where userid = *

and all users are displayed.

now i click on a link with linkparameter

now the select will look like this

select * from User where userid = 10

How can I do that

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