The following example finds the commission plan in the COMMPLAN table, based on the current value of the commcode item in the EMPLOYEE block in the form, to verify that the code is valid.
If the code in the COMMPLAN table is located, the description of the COMMPLAN is obtained and deposited in the non-database Description item. Otherwise, an error is raised.

** Method 1: Using a SELECT...INTO statement, the trigger
** looks more readable but can be less efficient
** than Method 2 because for ANSI Standard
** compliance, the SELECT...INTO statement must
** return an error if more than one row is
** retrieved that matches the criteria. This
** implies PL/SQL may attempt to fetch data twice
** from the table in question to insure that there
** aren’t two matching rows.

SELECT description
INTO :Employee.Commplan_Desc
FROM commplan
WHERE commcode = :Employee.Commcode;
WHEN No.Data_Found THEN
Message(’Invalid Commission Plan, Use <List> for help’);
RAISE Form_trigger_Failure;
WHEN Too_Many_Rows THEN
Message(’Error. Duplicate entries in COMMPLAN table!’);
RAISE Form_trigger_Failure;

** Method 2: Using an Explicit Cursor looks a bit more
** daunting but is actually quite simple. The
** SELECT statement is declared as a named cursor
** in the DECLARE section and then is OPENed,
** FETCHed, and CLOSEd in the code explicitly
** (hence the name). Here we guarantee that only a
** single FETCH will be performed against the
** database.

noneFound BOOLEAN;
CURSOR cp IS SELECT description
FROM commplan
WHERE commcode = :Employee.Commcode;
OPEN cp;
FETCH cp INTO :Employee.Commplan_Desc;
noneFound := cp%NOTFOUND;
IF noneFound THEN
Message(’Invalid Commission Plan, Use <List> for help’);
RAISE Form_trigger_Failure;

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Fires during the Validate the Item process. Specifically, it fires as the last part of item validation for items with the New or Changed validation status.

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V. Kapoor

{picture#} Vinish Kapoor is a Software Consultant, currently working in a reputed IT company in Noida, India and doing blogging on Oracle Forms, SQL and PLSQL topics. He is an author of an eBook Oracle Forms Recipes, which is available on Google play. {facebook#} {twitter#} {google#}
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