Dynamic selection of records based on checkbox checked

Question

Hello,
I want to select a list of records from a multirecord block by
using the checkbox checked values as the criterion and use the
records selected in the where clause for querying in another
forms. The data from the multirecord block is from a query
result and hence is dynamic.
I went about doing this:
I created a multirecord block. In the multirecord block, I
created a checkbox which was a non-database item.
In the when_button_pressed trigger I wrote the following code:
declare
     temp varchar2(1000);
     start_rec number;
     stop_rec number;
     item_id item;
     block_id block;
     item_value varchar2(1000);
     pl_id paramlist;
     item_name varchar2(10);
     patient_list varchar2(1000);
begin
go_block('patient_list');
block_id:=find_block('patient_list');
start_rec:=1;
stop_rec:=get_block_property(block_id,query_hits);
for i in start_rec..stop_rec loop
if :selection='Y' then --selection is the checkbox           
     if item_value is null then
/*item_value holds the value of the data shown in the forms &
for which the checkbox is checked*/
item_value:=name_in(':patient_list.patient_id');
/*patient_id is the item name as well as field name in the
table*/
     else
item_value:=item_value||','||name_in(':patient_list.patient_id');
     end if;
end if;
end loop;
patient_list:='('||item_value||')';
pl_id:=create_parameter_list('list_of_patients');
add_parameter(pl_id,'querypatients',text_parameter,patient_list);
message(patientlist);
run_product
(forms,'patient_history',synchronous,runtime,filesystem,pl_id,nul
l);
end;
When I run this form, patient_list comes as
(111,111,111,111,111,111,111) where
111 is the value of the patient_id.
The only value that gets into the patient_list is the patient_id
for the last checkbox I have
checked in the forms and the same patient_id appears so many
times.
Can anyone tell me where I am doing the mistake? Why is the same
value appearing so many times and only the last record selected
appears in the patient_list.
Thank you for your suggestions.

Answer 1

Thank You.
I added go_record(start_rec) and next_record and everything
worked fine.
Here I have the working code:
declare
     temp varchar2(1000);
     start_rec number;
     stop_rec number;
     item_id item;
     block_id block;
     item_value varchar2(1000);
     pl_id paramlist;
     item_name varchar2(10);
     patient_list varchar2(1000);
begin
     go_block('patient_list');
     block_id:=find_block('patient_list');
     start_rec:=1;
     stop_rec:=get_block_property(block_id,query_hits);
go_record(start_rec);-- I added it
     for i in start_rec..stop_rec loop
     if :selection='Y' then --selection is the checkbox in  
the patient_list block.
     if item_value is null then
-- item_value holds the value of the data shown in the forms and
for which the checkbox is checked
     item_value:=name_in(':patient_list.patient_id');
-- patient_id is the item name as well as field name in the table
     else
     item_value:=item_value||','||name_in
(':patient_list.patient_id');
     end if;
     end if;
next_record;-- I added it
     end loop;
patient_list:='('||item_value||')';
pl_id:=create_parameter_list('list_of_patients');
add_parameter(pl_id,'querypatients',text_parameter,patient_list);
message(patientlist);
run_product
(forms,'patient_history',synchronous,runtime,filesystem,pl_id,nul
l);
end;