Setting default value read from user session, for an LOV in Query component

Question

I want to set the default value of a field in VO that participates in a named view criteria and thereby in Query component. That field is configured with an LOV by mean of a view accessor. The values are Y and N and the corresponding display strings obtained from view accessor are true and false respectively.
I am able to set the default value by setting the value of the criteria item corresponding to that field in view criteria. I am setting the value as either Y or N and I am able to corresponding display string as per the view accessor, on the query component when it is rendered.
I want to read the defauilt value from the ADF BC user session and set it as default value. I tried setting the values as "adf.userSession.userData.usageFlag". Iam ensuring that the attribute usageFlag is set before the view activity that has the query component is invoked. But this is ending up showing no default value in the Query component when rendered.
Can any one let me know how to go about with this?

Answer 1

I made up your table since you didn't provide some example, but I'm sure this will give you the picture:
SQL> var run_type varchar2(1)
SQL> exec :run_type := 'A'
PL/SQL procedure successfully completed.
SQL> create table my_cycles as select level cycle_id
  2                            ,      level cycle_status
  3                            from   dual connect by level <= 5;
Table created.
SQL> select cycle_id
  2  from   my_cycles
  3  where  case
  4           when :run_type = 'D' and cycle_status  = 1 then 1
  5           when :run_type != 'D' and cycle_status  in ( 2, 3 ) then 1
  6         end = 1;
  CYCLE_ID
         2
         3
2 rows selected.
SQL> exec :run_type := 'D';
PL/SQL procedure successfully completed.
SQL> /
  CYCLE_ID
         1
1 row selected.
SQL>