oracle forms triggers

Introduction to Triggers http:// ebiztechnics.blogspot.com

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Introduction to Triggers

http://ebiztechnics.blogspot.com

Objectives

• Define Triggers• Different Types of Triggers• Scope of Triggers• Trigger Execution Hierarchy

http://ebiztechnics.blogspot.com

Form Builder Triggers

• A trigger is a PL/SQL Block which fires implicitly whenever an Event occurs.

Events:Item Interaction

Errors/MessagesQueries

Validation

Navigation

Mouse Events

others

PL/SQLBLOCK

http://ebiztechnics.blogspot.com

Trigger Components- Scope

Scope

Type

CodeForm LevelBlock LevelItem Level

http://ebiztechnics.blogspot.com

Trigger Components - Type

Scope

Type

Code

Pre-Post-WhenOn-Key-

http://ebiztechnics.blogspot.com

Trigger Components - Code

SQL StatementsPL/SQL StatementsBuilt-in Sub-programsUser Defined Sub-programs

Scope

Type

Code

http://ebiztechnics.blogspot.com

Execution Hierarchy

Item Level

Block Level

Form Level

On-Error

EH=After

On-Error

EH=After

On-Error

EH=Override

Event

http://ebiztechnics.blogspot.com

Summary

• Trigger: Implicitly Fires• Type: Defines the event that fires it• Prefixes:

– Pre- – Post– When– On– Key

• Code: Anonymous PL/SQL Block• Scope: Form, block, or item level

http://ebiztechnics.blogspot.com

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