我必须修改块以使用光标来读取和显示我的数据库中保存的购物者篮子26的信息

Question

DECLARE
lv_basket_num NUMBER (3);
lv_created_date DATE;
lv_qty_num NUMBER(2);
lv_sub_num NUMBER(5,2);
lv_days_num NUMBER(3);
lv_shopper_num NUMBER(3) := 26;

BEGIN
SELECT idBasket, dtcreated, quantity, subtotal
INTO lv_basket_num, lv_created_date, lv_qty_num, lv_sub_num
FROM BB_BASKET
WHERE idShopper = lv_shopper_num
AND orderplaced= 0;

lv_days_num := SYSDATE-lv_created_date;
DBMS_OUTPUT.PUT_LINE(lv_basket_num||'*'||lv_created_date||'*'||lv_qty_num||'*'||lv_sub_num||'*'||lv_days_num);

END;

Answer 1

将SELECT“转换”为游标很容易：

cursor cur_r is select ... <your query goes here>;

然后你必须声明一个游标变量（它将保存游标返回的结果）（而不是你现在声明的一堆变量），打开游标，从中获取，注意退出循环，关闭游标。太多的行为，所以 - 为什么你不让Oracle为你做那个？切换到游标FOR循环。

这是如何做：

DECLARE
  lv_shopper_num NUMBER(3) := 26;
BEGIN
  for cur_r in (SELECT idBasket, dtcreated, quantity, subtotal,
                       sysdate - dtcreated as lv_days_num
                FROM BB_BASKET
                WHERE idShopper = lv_shopper_num
                  AND orderplaced = 0
               )
  loop               
    DBMS_OUTPUT.PUT_LINE(cur_r.idBasket ||'*'|| cur_r.dtcreated ||'*'|| 
                         cur_r.quantity ||'*'|| cur_r.subtotal  ||'*'|| lv_days_num);
  end loop;
END;