How to stop just one item being reset when sumbit is pressed?

How can i keep the value of just one item when the submit button is pressed. This field will always be the user id of the user logged on so i dont want it to be reset. I have tired doing a simple query to select the id everytime the page loads but the value then appears null when i do an insert statement to create a particular record for the user in a table.
Anyone any ideas?

Right I could see how the APP_USER would work but it wouldn’t work in this situation.
To be more specific I want the id of the user which is called student id to stay the same all the way through the application as there id refers to them. What I have is that when a user logs on it takes them to their details and a menu part. One of the options is to enter some documents relevant to them. So when they click this option a new page opens showing a report of all the current documents as well as a form where you can update, insert new and delete documents.
When you load the page the report and form work fine with the correct student id being passed form the pervious page. If however you create a document all the fields in the form get reset. I therefore want a way of stopping the student id from being reset when you create or delete a document. Basically if the page refreshes.
I can run an sql query that gets the correct student id if the field is null and displays it correctly in the form but for some reasons (im guessing cos its a result of a query) when it tries to process this when I submit the field is null.
Any ideas as this one has got me

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How to stop just one item being reset when sumbit is pressed?

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