check the trigger quantity - at hand when you insert the order quantity

Jin
I have problem with trigger, I use the OE schema
I have the form master / detail for orders and Order Details, that I need when I insert the order quantity to check the quantity available for each product using the trigger
I use oracle 10g developer
any help would be appreciated
Thank you very much

2MEO wrote:

Bamba says:
What is the structure of your database? and this code that you write?

don't tell that you don't know how write the SQL query :)

Thank you for your quick response
I can write the SQL query
I use these lines:

SELECT quantity_on_hand
INVENTORIES
WHERE Product_ID =: Product_ID;
IF: quantity > Quantity_on_hand THEN
MESSAGE ("the inventory is not enough");
END IF;

Why do you think I can't write same SQL query?
Thank you Bailey

The query is bad :) there is no INTO clause

Write it on quantity WHEN-VALIDATE-ITEM and KEY-NEXT-ITEM

 declare
   vquantity number;
begin
 SELECT quantity_on_hand
  into vquantity
  FROM INVENTORIES
 WHERE Product_ID = :Product_ID;

 IF :quantity > vquantity THEN
    MESSAGE ('the inventory is not enough');
     raise form_trigger_failure;
 else
    null; -- or next_item if you are using KEY NEXT ITEM trigger
 END IF;

Exception when no_data_found then
  message('Invalid product ID');
 raise form_trigger_failure;
END;

Tags: Oracle Development

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