a trigger on sql code example

Example 1: creation d'un trigger sql

CREATE OR REPLACE TRIGGER trigg_example
 BEFORE INSERT OR UPDATE ON table_example
 FOR EACH ROW
 WHEN (new.no_line > 0)
 DECLARE
     evol_exemple number;
 BEGIN
     evol_exemple := :new.exemple  - :old.exemple;
     DBMS_OUTPUT.PUT_LINE('  evolution : ' || evol_exemple);
 END;

Example 2: trigger vérifier stock

BEGIN
 
UPDATE `product` 
    SET `price` =  NEW.price
    , `quantity` = NEW.quantity 
    , date_modified = NOW() 
    WHERE `product_id` = NEW.product_id;
    AND price > NEW.price 
    AND quantity > 0
;
 
END

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Sql Example

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