Oracle Trigger - oracle tutorial - sql tutorial




What is Oracle Trigger ?

  • In Oracle, you can define procedures that are implicitly executed when an INSERT, UPDATE or DELETE statement is issued against the associated table.
  • These procedures are called database triggers.
  • There are six CREATE TRIGGER statements according to their firing points.
  • A trigger can include SQL and PL/SQL statements to execute as a unit and can invoke stored procedures.
Oracle sql trigger

Oracle sql trigger

Firing Point: BEFORE

  • BEFORE INSERT TRIGGER
  • BEFORE UPDATE TRIGGER
  • BEFORE DELETE TRIGGER

Firing Point: AFTER

  • AFTER INSERT TRIGGER
  • AFTER UPDATE TRIGGER
  • AFTER DELETE TRIGGER
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Trigger Types

  • Oracle BEFORE INSERT/UPDATE/DELETE Trigger
  • Oracle AFTER INSERT/UPDATE/DELETE Trigger
  • Oracle DROP Trigger
  • Oracle DISABLE Trigger
  • Oracle ENABLE Trigger

BEFORE INSERT TRIGGER

  • A BEFORE INSERT Trigger means that Oracle will fire this trigger before the INSERT operation is executed.

Syntax

CREATE [ OR REPLACE ] TRIGGER trigger_name
BEFORE INSERT
   ON table_name
   [ FOR EACH ROW ]
DECLARE
   -- variable declarations
BEGIN
   -- trigger code
EXCEPTION
   WHEN ...
   -- exception handling
END;
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BEFORE UPDATE TRIGGER

  • A BEFORE UPDATE Trigger means that Oracle will fire this trigger before the UPDATE operation is executed

Syntax

CREATE [ OR REPLACE ] TRIGGER trigger_name
BEFORE UPDATE
   ON table_name
   [ FOR EACH ROW ]
DECLARE
   -- variable declarations
BEGIN
   -- trigger code
EXCEPTION
   WHEN ...
   -- exception handling
END;
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BEFORE DELETE Trigger

  • A BEFORE DELETE Trigger means that Oracle will fire this trigger before the DELETE operation is executed.

Syntax

CREATE [ OR REPLACE ] TRIGGER trigger_name
BEFORE DELETE
   ON table_name
   [ FOR EACH ROW ]
DECLARE
   -- variable declarations
BEGIN
   -- trigger code
EXCEPTION
   WHEN ...
   -- exception handling
END;

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AFTER INSERT Trigger

  • An AFTER INSERT Trigger means that Oracle will fire this trigger after the INSERT operation is executed.

Syntax

CREATE [ OR REPLACE ] TRIGGER trigger_name
AFTER INSERT
   ON table_name
   [ FOR EACH ROW ]
DECLARE
   -- variable declarations
BEGIN
   -- trigger code
EXCEPTION
   WHEN ...
   -- exception handling
END;
click below button to copy the code. By - oracle tutorial - team
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AFTER UPDATE Trigger

  • An AFTER UPDATE Trigger means that Oracle will fire this trigger after the UPDATE operation is executed.

Syntax

CREATE [ OR REPLACE ] TRIGGER trigger_name
AFTER UPDATE
   ON table_name
   [ FOR EACH ROW ]
DECLARE
   -- variable declarations
BEGIN
   -- trigger code
EXCEPTION
   WHEN ...
   -- exception handling
END;

click below button to copy the code. By - oracle tutorial - team

AFTER DELETE Trigger

  • An AFTER DELETE Trigger means that Oracle will fire this trigger after the DELETE operation is executed.

Syntax

CREATE [ OR REPLACE ] TRIGGER trigger_name
AFTER DELETE
   ON table_name
   [ FOR EACH ROW ]
DECLARE
   -- variable declarations
BEGIN
   -- trigger code

EXCEPTION
   WHEN ...
   -- exception handling
END;
click below button to copy the code. By - oracle tutorial - team

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