Question

我试图在游标中使用c_msisdn值进行选择查询，但是它给出了没有找到数据的错误，但是如果我自己提供的价值就像WHERE MSISDN =＆＃39; 315XXX＆＃39;而不是WHERE MSISDN = c_msisdn返回结果。如何在select中使用游标值。

DECLARE
c_msisdn SSM_SMSCDATA.MSISDN%type;
c_status SSM_SMSCDATA.STATUS%type;
c_promo_id SSM_SMSCDATA.PROMO_ID%type;
view_all_status char(50) := '';
unsub_all_status char(50) := '';
services_subscribed char(400) := '';
CURSOR c_smscdata is SELECT MSISDN, STATUS, PROMO_ID FROM SSM_SMSCDATA; 

BEGIN 
OPEN c_smscdata; 
LOOP 
FETCH c_smscdata into c_msisdn, c_status, c_promo_id;

SELECT SUBSCRIPTION_ID into services_subscribed FROM (SELECT LISTAGG(SUBSCRIPTION_ID, '-') WITHIN GROUP (ORDER BY MSISDN) AS SUBSCRIPTION_ID
FROM   SINGLESUBSCRIPTION
WHERE MSISDN = c_msisdn
GROUP BY MSISDN);

IF c_promo_id = '2' THEN 
  view_all_status := 'View All';
   ELSE view_all_status := 'Unsub All';
END IF;

IF c_status = 3 THEN 
  unsub_all_status := 'View Successful';
   ELSE unsub_all_status := 'Unsuccessful';
END IF;


INSERT INTO SSM_DAILY_REPORT (msisdn,view_all,unsub_all,SERVICES)
VALUES (c_msisdn,view_all_status,unsub_all_status,services_subscribed);

--dbms_output.put_line(c_msisdn || ' ' || c_status || ' ' || c_promo_id); 

EXIT 
WHEN c_smscdata%notfound; 
END LOOP; 
CLOSE c_smscdata; 

END;

Answer 1

您获取NO_DATA_FOUND异常的最可能原因是您的ssm_smscdata表中的msisdn值在您的singlesubscription表中不存在。

如果我是你，我不会费心使用游标进行循环。相反，我会在一个INSERT语句中完成所有操作，如下所示：

INSERT INTO ssm_daily_report (msisdn, view_all, unsub_all, services)
SELECT scs.msisdn,
       CASE WHEN scs.promo_id = '2' THEN 'View All';
            ELSE 'Unsub All'
       END view_all_status,
       CASE WHEN scs.status = 3 THEN 'View Successful';
            ELSE 'Unsuccessful'
       END unsub_all_status,
       sss.services_subscribed
FROM   ssmsmscdata scs 
       INNER JOIN (SELECT msisdn,
                          LISTAGG(subscription_id, '-') WITHIN GROUP (ORDER BY msisdn) AS services_subscribed
                   FROM   singlesubscription
                   GROUP BY msisdn) sss ON sss.msisdn = scs.msisdn;

这样，你就可以避免重新发明嵌套循环连接（释放Oracle以选择它认为最好使用的连接类型，这可能是也可能不是嵌套循环）。您还可以避免游标循环涉及的所有上下文切换和逐行处理，并让Oracle一举完成所有工作。

此外，通过执行内部联接，可以避免出现在ssm_smscdata表中但不会出现单个订阅的棘手问题，因为这些行不会被返回。如果您还需要返回这些行，则需要将上述查询中的INNER JOIN转换为OUTER JOIN。

如何在过程中选择查询中使用当前游标值

1 个答案: