oracle trigger after insert example | Oracle After insert/update/delete Trigger - oracle tutorial - sql tutorial




How to trigger AFTER INSERT/UPDATE or DELETE in Oracle ?

  • A table with various constraints to ensure data integrity.
  • In addition to the constraints, I have triggers on BEFORE INSERT and BEFORE UPDATE to ensure that necessary data goes into the table.
 Database triggers
  • In some cases, allowing the application layer to omit the information from their queries, and in some cases forcing that it be present.
  • This statement specifies that Oracle will fire this trigger AFTER the INSERT/UPDATE or DELETE operation is executed.

Syntax


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

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Parameters

OR REPLACE:

  • It is an optional parameter. It is used to re-create the trigger if it already exists. It facilitates you to change the trigger definition without using a DROP TRIGGER statement.

trigger_name:

  • It specifies the name of the trigger that you want to create.

AFTER INSERT or UPDATE or DELETE:

  • It specifies that the trigger will be fired after the INSERT or UPDATE or DELETE operation is executed.

table_name:

  • It specifies that the trigger will be fired after the INSERT or UPDATE or DELETE operation is executed.
  • It specifies the name of the table on which trigger operation is being performed.
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Limitations

  • AFTER trigger cannot be created on a view.
  • You cannot update the OLD values.
  • You can only update the NEW values.

Oracle AFTER Trigger Example

  • Consider, you have a "suppliers" table with the following parameters.
	CREATE TABLE  "SUPPLIERS"   
	(    "SUPPLIER_ID" NUMBER,   
	"SUPPLIER_NAME" VARCHAR2(4000),   
	"SUPPLIER_ADDRESS" VARCHAR2(4000)  
	)  
	/  
	You can use the following CREATE TRIGGER query to create a AFTER INSERT 
        or UPDATE or DELETE Trigger:
	CREATE OR REPLACE TRIGGER  "SUPPLIERS_T2"   
	AFTER  
	insert or update or delete on "SUPPLIERS"  
	for each row  
	begin  
	when the person performs insert/update/delete operations into the table.  
	end;  
	/  
	ALTER TRIGGER  "SUPPLIERS_T2" ENABLE  
	/  
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  • Here the trigger name is "SUPPLIERS_T2" and it is fired AFTER the insert or update or delete operation is executed on the table "suppliers".
 After  triggers

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