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Dynamic display in Report [message #347609] Fri, 12 September 2008 05:47 Go to next message
Messages: 38
Registered: February 2006
Location: INDIA
The report needs to display only the fields selected while calling the report from a form. Suppose the report has 4 columns, but only 3 are selected while calling the report. So only the 3 selected column needs to be displayed and the report layout to be adjusted dynamically (i.e. no gapto be shown for the column not selected). I am new to reports. Kindly suggest something.

Re: Dynamic display in Report [message #347662 is a reply to message #347609] Fri, 12 September 2008 10:35 Go to previous message
Messages: 20847
Registered: June 2005
Location: Croatia, Europe
Senior Member
Account Moderator
Well, as far as I can tell, query should be the same all the time.

Report should know which columns are to be displayed. It can be done by storing this information into a table (so that report could see it), or by one (or more) parameter(s).

"One parameter" solution might contain some kind of a binary mask. For example, if there were 4 fields and you'd like to display fields 1, 3, 4 and hide field 2, mask would look like "1011".
Next, you'd create a format trigger for every field which would - using the SUBSTR function - check state of "its" bit of hide/display information. For example, field 3 format trigger might look like
  l_bit number(1);
  select substr(:par_binary_mask, 3, 1) into l_bit
  from dual;
  return (l_bit = 1);

Or, if possible, you could use this mask in the report query, as
  decode(substr(:par_binary_mask, 1, 1), 1, column_1, null) col_1,
  decode(substr(:par_binary_mask, 2, 1), 1, column_2, null) col_2,
from some_table
where ...

"More than one parameter" would, basically, do the same, but you'd check state of every parameter's value (which, in a case that query contains many records, would require (too?) many parameters).

Note that I didn't test it - it was just a pure theory.

Also, I have never created a report using the dynamic query which could (maybe) be transfered from a form to a report. For more information about such a solution wait for someone else's opinion.
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