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
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;
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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;
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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;