关于Forms_ddl的应用

      最近开发一个Form,需要用动态SQL,在网上搜索，发现可以用Forms_ddl来实现。试了很久，不成功，后发现是字符串连接的方式有问题，修正后终于OK. 以下是代码，供大家参考！

DECLARE

   CURSOR c1

   IS

      SELECT COUNT (1)

        FROM  inv_customs_items

       WHERE inventory_items = :find.inventory_items;

   v_count             NUMBER;

   p_attribute_no       VARCHAR2 (30);

   p_attribute          VARCHAR2 (30);

   p_sql               VARCHAR2 (200);

   p_inventory_items    VARCHAR2 (30);

   p_user_id           NUMBER;

BEGIN

   IF :find.inventory_items IS NULL

   THEN

      show_alert_message ('Inventory_items 必须输入！');

      RAISE form_trigger_failure;

   END IF;

   OPEN c1;

   FETCH c1

    INTO v_count;

   CLOSE c1;

   IF v_count < 1

   THEN

      INSERT INTO inv_customs_items

                  (inventory_items, created_by, creation_date

                  )

           VALUES (:find.inventory_items, :parameter.user_id, SYSDATE

                  );

   END IF;

   p_user_id:= :parameter.user_id;

   GO_BLOCK ('item');

   FIRST_RECORD;

  

   LOOP

      EXIT WHEN :item.attribute_name IS NULL;

      p_attribute_no := :item.attribute_no;

      p_attribute := :item.ATTRIBUTE;

      p_inventory_items := :find.inventory_items;

      BEGIN

         p_sql :=

               'update INV_CUSTOMS_ITEMS set LAST_UPDATE_DATE=sysdate,LAST_UPDATED_BY='

            || to_char(p_user_id)

            || ','

            || p_attribute_no

            || '= '''

            || p_attribute

            || ''' where inventory_items ='''

            || p_inventory_items

            || '''';

         FORMS_DDL (p_sql);

      EXCEPTION

         WHEN OTHERS

         THEN

            show_alert_message ('保存失败！');

            RAISE form_trigger_failure;

      END;

      NEXT_RECORD;

   END LOOP;

   COMMIT_FORM;

   FIRST_RECORD;

   show_alert_message ('恭喜您，保存成功');

END;