Question regarding Computation of SQL in PL/SQL region

Is there a way to control when the computation of an sql statement in a PL/SQL region is performed?
Situation: I save a value from a text field to a hidden variable and perform a doSubmit() so it is saved as a session variable. I have this session variable referenced in a SQL statement in a PL/SQL region on the page reload, but it appears as though the statement cannot get the session variable value.
Any suggestions would be helpful.

Here is a list of resources prepared by our friend Raj:
"here are some resources that'll help you get a better feel for Application Express (formerly called HTML DB) w/o killing too much time:
the quickest/shortest way to get a decent feel for Application Express would probably be our Oracle By Examples. we have them up at...
http://www.oracle.com/technology/products/database/application_express/obes.html
...and the one that helps you most to "get it" is...
http://www.oracle.com/technology/obe/obe10gdb/develop/htmldb/htmldb.htm
...the much longer and more comprehensive tutorial we have is at...
http://www.oracle.com/technology/products/database/application_express/tutorials.html
...but you probably don't need step through the whole thing - just know it's available. after you get the gist of Application Express, the next step would probably be to understand how you can use it to do fancier things. the easiest way to get a feel for that (w/o even lifting a finger) would be to look at the growing list of how-to documents we have in our corner of OTN...
http://www.oracle.com/technology/products/database/application_express/howtos/index.html
...and if i had to pick a favorite, i'd probably still say the file upload/download one's mine...
http://www.oracle.com/technology/products/database/application_express/howtos/howto_file_upload.htmload.html
...so between looking at the OracleByExample and glancing over our how-to's, i'm hoping you'll start to appreciate the many perks to using Application Express (most of the how-to's, fyi, are available in our 2-day developer guide, in case you're looking to print something out). after that, you should just know that we've a good amount of content in our corner of OTN...
http://apex.oracle.com/otn
...and our forum on OTN is getting a bit of attention w/in the oracle community for being pretty darn good...
http://forums.oracle.com/forums/forum.jspa?forumID=137
Scott

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