Question

master-detail relationship (quering records without having to press "enter-query" n "execute-query")

Asked by: sgf8058

hi friends

i have a master detail form  between Department (master) n Employee(detail). i have 2 data blocks.
im using the default oracle 8i database. user selects a dept no from a LOV and the records corresponding to tht dept no from fetched from employee table and displayed in employee block.
to see the records,i have to first go to "enter query " mode and then "execute-query".
i want tht when the user selects a dept no from the LOV ,the records corresponding to the dept no instantly  showen to him without haviing to do extra steps.
i have tried to do it but not with success.
i used a new form instance trigger and enter ENTER_QUERY in it.so now i dont have to go to enter_query at run time.but dont know the triggers for execcute query.


many thanks

sgf

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Asked On
2004-07-13 at 03:05:34ID21056702
Tags

master

,

detail

,

oracle

Topic

Databases Miscellaneous

Participating Experts
1
Points
300
Comments
5

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Answers

 

by: HenkaPosted on 2004-07-13 at 04:42:36ID: 11537978

I think that you can modify the DEFAULT_WHERE block propery of master block. It can be done in a Pre-Query trigger.

 

by: sgf8058Posted on 2004-07-14 at 01:21:22ID: 11546648

can u give sum example what code wd b written.many thanks

 

by: HenkaPosted on 2004-07-14 at 01:45:18ID: 11546782

Here is a piece of code from Pre-Query trigger of my block REKLAM_REKL_OBJ based on table OBJEDNAVKA:

DECLARE
   def_where  VARCHAR2(4000):= NULL;
BEGIN
/* item from table POZIADAVKA */
   IF name_in('REKLAM_REKL_OBJ.L_TYP_ZIAD_NAZOV') IS NOT NULL THEN
     def_where := get_block_property('REKLAM_REKL_OBJ', DEFAULT_WHERE);

     def_where := cgfk$lkup_qry.add_and( def_where )||
'(ID IN (Select poziadavka.objednavka_id from poziadavka where poziadavka.TYP_ZIAD_ID='||to_char(:REKLAM_REKL_OBJ.TYP_ZIAD_ID)||'))';
    set_block_property('REKLAM_REKL_OBJ', DEFAULT_WHERE, def_where);
   END IF;

  EXCEPTION
    WHEN VALUE_ERROR THEN
          MESSAGE('Error');
      RAISE FORM_TRIGGER_FAILURE;
END;

20120131-EE-VQP-002

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