question them at the form level

Hi all

Give an example of pre-query, the trigger a time new point instance at the level of the form.

because these triggers show at the level of forms.

What is the use of these triggers to the level of the forms.

Are you just trying to understand what these triggers?  If so, the best way to know is to open the help of forms on these triggers.  Forms Help topics tell you when these triggers fire, what legal commands you can use in relaxation and give you examples of the use of the relaxation.   For example, here is the article helps Forms for relaxation of prior query.

Pré-requête Trigger

Description

Fires during the treatment to run the query or the query of account, just before Oracle Forms built and issuing the SELECT statement to identify the rows that match the query criteria.

Level of definition of form or block

Legal controls

SELECT, without restriction of built-ins instructions

Enter the query Mode without

Notes on use

Use a trigger of the query before you change the example record that determines which rows will be identified by the query.

In case of failure

The query is cancelled. If the operator or the application had placed the form in query mode enter, enter the form remains in query mode.

Fires in

COUNT_QUERY

EXECUTE_QUERY

Open the query

Prepare the query

Example query before trigger

This example validates or modifies the query criteria for a query of database block.

/*
 ** Set the ORDER BY clause for the current block
 ** being queried, based on a radio group
 ** called 'Sort_Column' in a control block named
 ** 'Switches'. The Radio Group has three buttons
 ** with character values giving the names of
 ** three different columns in the table this
 ** block is based on:
 **
 ** SAL
 ** MGR,ENAME
 ** ENAME
 */
 BEGIN
  Set_Block_Property('EMP',ORDER_BY, :Switches.Sort_Column);
 /*
 ** Make sure the user has given one of the two
 ** Columns which we have indexed in their search
 ** criteria, otherwise fail the query with a helpful
 ** message
 */
 IF :Employee.Ename IS NULL AND :Employee.Mgr IS NULL THEN
  Message('Supply Employee Name and/or Manager Id '|| 'for Query.');
  RAISE Form_Trigger_Failure;
 END IF;
 /*
 ** Change the default where clause to either show "Current
 ** Employees Only" or "Terminated Employees" based on the
 ** setting of a check box named 'Show_Term' in a control
 ** block named 'Switches'.
 */
 IF Check box_Checked('Switches.Show_Term') THEN
  Set_Block_Property('EMP',DEFAULT_WHERE,'TERM_DATE IS NOT NULL');
 ELSE
  Set_Block_Property('EMP',DEFAULT_WHERE,'TERM_DATE IS NULL');
 END IF;
 END;

Craig...

Tags: Oracle Development

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