How to save the session states for a tabular form WITHOUT using check boxs?

Question

Greeting guys,
As you know that we can use collections to save the session states of a tabular forms, described in the how-to doc of manual tabular forms. However, what I am trying to do ( or have to do) is to provide a manual tabular form, and save the session states for validation, without using the check boxes. Because a user can put contents into some columns in a row without checking the corresponding checkbox, according to the requirements. So basically what I tried is to loop over all the rows and save Every entry into a collection. However, sometimes I got "no data found" error with unknown reasons.
My current solution is to use the "dirty" Retry button that gets back the history, which IMO is not a good workabout. So, I'd appreciate if somebody can shed some light on a better solution, especially if it is close to the one in that how-to doc.
Thanks in advance.
Luc

Answer 1

The following is the first collection solutin I've tried:
htmldb_collection.create_or_truncate_collection('TEMP_TABLE');
for i in 1..p_row_num loop -- Loop on the whole form rows
if (htmldb_application.g_f01(i) is not null) or (htmldb_application.g_f05(i) <> 0)
--If either of them has some input values, the row should be saved into the colleciton.
then
htmldb_collection.add_member(
p_collection_name => 'TEMP_TABLE',
p_c001 => htmldb_application.g_f01(i),
p_c002 => htmldb_application.g_f03(i),
p_c003 => htmldb_application.g_f04(i),
p_c004 => htmldb_application.g_f05(i),
p_c005 => htmldb_application.g_f06(i),
p_c006 => htmldb_application.g_f08(i)
end if;
end loop;
Some of columns have null values, but I don't think that's the reason. Because once I clicked all the check boxes, there would be no error no matter what values were in other columns.
Another issue would be extract the values FROM the collection, which has been tried because I had problem to store the data into the collection. I used "decode" functions inside the SQL to build the tabular form. I am not sure whether it will be the same as a regular SQL for a tabular form, like the example in the How-to doc.
Also I didn't use the checksum, for it is not an issue at the current stage. I am not sure whether that's the reason which caused the NO DATA FOUND error.