Query_data_source_name block property

Hi all.
I want to create a block non-base table in which I want to change dynamically the source of the block. I have thougth to set at runtime the block property query_data_source_name and to pass it a different select at a different value of a parameter.
My questions are:
1) How is the use of this property??? I have seen it on the on line help but it's not clear.
2) Is there another way to obtain the same result??
I'm on devsuite10g.
Thanks in advance for the collaboration.
Fabrizio

I have tried to clear the block; but the result is the same.
Here is my code:
DECLARE
condizione varchar2(5000) := null;
BEGIN
     condizione := '(select '||:parameter.campo1||', count('||:parameter.campo1||') from '||:parameter.imposta_ricerca||' group by '||:parameter.campo1||')';
     go_block('sag_cong_congiunturali');
     clear_block;
     set_block_property('sag_cong_congiunturali_raggr',query_data_source_name,condizione);
     go_block('sag_cong_congiunturali_raggr');
     execute_query;
END;
When I'm in runtime the select is this:
(select CODICE, count(CODICE) from SAG_CONG_CONGIUNTURALI group by CODICE)
I don't understand where is the error...
Fabrizio

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Edited by: Doug Galayda on Apr 16, 2009 12:36 PM

1. This is really why I did it in pieces:
2. Whole query does work
1.The form previously has a existing form-clause-query
When I put a whold valid select in
It attaches ‘the new from clause qeury’ on to the select.
Select item1, item2, item3
From(select item1, item2 <<my new from clause
I see this effect in a :system.last_query display.
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They add themselves to(or around) what ever I put into
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Select id, fac_id, num, parent_mode_id, cd_id, description, capture_percent
From
What ever I put into a SET_BLOCK_PROPERTY becomes this
Select id, fac_id, num, parent_mode_id, cd_id, description, capture_percent
From( my new set_block_property here
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It does work, but only when I use a literal ‘’0031’’ in double quotes,
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'(SELECT C.ID, A.ID EP_ID,A.FAC_ID,A.NUM,A.DESCRIPTION,C.PARENT_MODE_ID,
C.CD_ID,C.CAPTURE_PERCENT,C.CAPTURE_METHOD,C.DATE_TESTED
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EP_MODES B,
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CONTROL_DEVICES CD
WHERE A.ID = B.EP_ID AND
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C.PARENT_MODE_ID IS NOT NULL AND
C.STACK_ID IS NULL and
cd.num = ''0031'')');
Steve Cosner replied to my first post
How can I pass a variable into a Query Data Source Name select's join?
Use one of these:
and cd.num = :Blk_name.Pass_cd_Id_num
and cd.num = :Parameter.Pass_cd_Id_num
and cd.num = :Global.Pass_cd_Id_num
Any one of the above would work. I would use either a hidden item in a control block, or a form parameter.
The sql select you build in the query-data-source name is passed
directly to Oracle for execution, and PL/SQL variables cannot be "seen" by the database.
Instead, you pass a bind variable (note the leading colon),
and Forms then knows to pass the value or location of the bind variable so Oracle can use it.
SET_BLOCK_PROPERTY('EMISSION_POINTS',QUERY_DATA_SOURCE_NAME,
'(SELECT C.ID, A.ID EP_ID,A.FAC_ID,A.NUM,A.DESCRIPTION,C.PARENT_MODE_ID,
C.CD_ID,C.CAPTURE_PERCENT,C.CAPTURE_METHOD,C.DATE_TESTED
FROM EMISSION_POINTS A,
EP_MODES B,
CAPTURING_DEVICES C,
CONTROL_DEVICES CD
WHERE A.ID = B.EP_ID AND
B.ID = C.PARENT_MODE_ID AND
C.CD_ID = CD.ID AND
C.CD_ID IS NOT NULL AND
C.PARENT_MODE_ID IS NOT NULL AND
C.STACK_ID IS NULL and
cd.num = :emission_points.cd_id_num)');
The bind variable :emission_points.cd_id_num in the above
set block property statement appears as its :bind variable name :emission_points.cd_id_num
This fails with frm-40505.
The key problem now it to get the :bind value to be ‘seen’ in the statement.
Thank you so much.
I appreciate your time and help.

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Message was edited by:
Killernero

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