在使用sap HANA中的触发器插入销售表后，如何从库存中减去数量

Question

我使用sap HANA中的触发器在销售表上插入后，如何从库存中减去数量

这里是我的代码：

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create trigger "KABIL_PRACTICE"."SALES_TRIGGER" 
after insert on "KABIL_PRACTICE"."SALES" for each row
begin 
declare Prod_ID integer;
declare Quantity integer;

select Prod_ID = "KABIL_PRACTICE"."Inventory"."P_ID", 
		Quantity = "KABIL_PRACTICE"."Inventory"."P_ID"
	from "KABIL_PRACTICE"."Inventory"
update "KABIL_PRACTICE"."Inventory" set "Inventory" = "Inventory"-Quantity where "P_ID" = @Prod_ID 
end;

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Answer 1

首先阅读documentation。

NEW在哪里？

代码应该看起来更像这样：

create trigger "KABIL_PRACTICE"."SALES_TRIGGER" 
    after insert on "KABIL_PRACTICE"."SALES"
    referencing new row new
    for each row
begin 
    update KABIL_PRACTICE.Inventory
        set Inventory = Inventory - :NEW.quantity
        where P_ID = :NEW.P_ID;
end;