Question

我有三张桌子

 produit(pid,nom,qteinitial,qteinstock,prix), 
prdouitinbondachat(pid,baid,qte,prix), 
prdoutinbondevente(pid,bvid,qte,prix) ,

我必须计算我的股票中的项目数量。所以，方程式shoubld。 qtyIntial + IN - OUT。

我已经定义了一个触发器来做到这一点。但我似乎，我有一个问题。这是我对触发器的声明：

CREATE OR REPLACE FUNCTION updateProduitQte() RETURNS TRIGGER AS $example_table$

    BEGIN
       IF (TG_OP = 'INSERT' OR TG_OP = 'UPDATE') THEN        
       UPDATE produit set qtestock= ((select coalesce(sum(qte), 0) from prdouitinbondachat  where pid = new.pid)  
       + (select coalesce((qteinitial), 0) from produit where pid = new.pid) - 
       (select coalesce(sum(qte), 0) from prdouitinbondevente WHERE pid = new.pid))  ;     

       return NEW ;        
      ELSIF (TG_OP = 'DELETE') THEN
      UPDATE produit set qtestock=  
 ((select coalesce(sum(qte), 0) from prdouitinbondachat  where pid = old.pid)  
       + (select coalesce((qteinitial), 0) from produit where pid = old.pid) - 
       (select coalesce(sum(qte), 0) from prdouitinbondevente WHERE pid = old.pid))  ;         
       return OLD ;  
      END IF;
      RETURN NULL;
    END;
$example_table$ LANGUAGE plpgsql;

这里我将功能与触发器匹配：

//vente triggeer
CREATE TRIGGER venteTrigger AFTER INSERT OR UPDATE OR DELETE ON prdouitinbondevente
FOR EACH ROW EXECUTE PROCEDURE updateProduitQte();

//achat trigger
CREATE TRIGGER achatTrigger AFTER INSERT OR UPDATE OR DELETE ON prdouitinbondachat
FOR EACH ROW EXECUTE PROCEDURE updateProduitQte();

Postgresql触发器不适合我

0 个答案: