Oracle Forms Triggers
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A trigger is a PL/SQL block that fires implicitly when an event occurs, such as item interaction, errors, queries, or navigation. Triggers have a type defining the event, code containing PL/SQL statements, and a scope at the form, block, or item level. Common trigger prefixes include pre-, post-, when-, on-, and key-. Triggers execute according to a defined hierarchy.
Oracle Forms Triggers
- 2. Objectives • Define Triggers • Different Types of Triggers • Scope of Triggers • Trigger Execution Hierarchy http://ebiztechnics.blogspot.com
- 3. Form Builder Triggers • A trigger is a PL/SQL Block which fires implicitly whenever an Event occurs. Events: Item Interaction Errors/Messages Queries Validation Navigation Mouse Events others PL/SQL BLOCK http://ebiztechnics.blogspot.com
- 4. Trigger Components- Scope Scope Type CodeForm Level Block Level Item Level http://ebiztechnics.blogspot.com
- 5. Trigger Components - Type Scope Type Code Pre- Post- When On- Key- http://ebiztechnics.blogspot.com
- 6. Trigger Components - Code SQL Statements PL/SQL Statements Built-in Sub-programs User Defined Sub-programs Scope Type Code http://ebiztechnics.blogspot.com
- 8. 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
Editor's Notes
- #4: Note: Events cause the activation, or firing, of certain trigger types.
- #6: Note: The On-Message trigger fires whenever Form Builder displays a message.
- #7: Note: Although you can include SQL statements in a trigger, keep in mind the following Rules about their use: INSERT, UPDATE, and DELETE statements must be placed only in Transactional triggers. These triggers fire during the commit process. Transaction control statements (COMMIT, ROLLBACK, SAVEPOINT) cannot Be included directly as SQL trigger statements. These actions are carried Out by Form Builder as a result of either commands or built-in procedures that you issue.