如何处理异常并执行剩余语句？

Posted 2023-03-27

【中文标题】如何处理异常并执行剩余语句？

【英文标题】：How to handle exception and execute remaining statements?

【发布时间】：2013-06-28 07:42:21

【问题描述】：

请找到下面的块。

for i in 1..acd.count loop

insert into customer_account_mapping select customerid,upper(pcd(i)),upper(acd(i)),cost from customer_master where customername=customer_name and concat(upper(pcd(i)),upper(acd(i))) not in (select concat(upper(pcode),upper(acode)) from customer_account_mapping);

insert into user_permissions select distinct user_id,sales_person_name,sales_mgr_name,upper(pcd(i)),upper(acd(i)) from user_permissions where sales_person_name=sales_person and concat(upper(pcd(i)),upper(acd(i))) not in (select concat(upper(pcode),upper(acode)) from user_permissions) and rownum<2 ;
commit;
end loop;

如果第一个插入语句发生错误如何处理并执行第二个插入语句。

【问题讨论】：

格式化你的代码会很有帮助，这样它就不会是一长行。

在每次插入后提交通常是不好的做法。为什么需要这样做？

【参考方案1】：

用 begin ... end ... exception 换行，就像 try / catch

for i in 1..acd.count loop

begin 
   insert into customer_account_mapping select customerid,upper(pcd(i)),upper(acd(i)),cost from customer_master where customername=customer_name and concat(upper(pcd(i)),upper(acd(i))) not in (select concat(upper(pcode),upper(acode)) from customer_account_mapping);
exception when others then 
   -- handle the exception
end;

insert into user_permissions select distinct user_id,sales_person_name,sales_mgr_name,upper(pcd(i)),upper(acd(i)) from user_permissions where sales_person_name=sales_person and concat(upper(pcd(i)),upper(acd(i))) not in (select concat(upper(pcode),upper(acode)) from user_permissions) and rownum<2 ;
commit;
end loop;

【参考方案2】：

EXCEPTION  -- exception handlers begin



 WHEN exception type  -- handles 'division by zero' error
           ...

 WHEN OTHERS THEN  -- handles all other errors
      ROLLBACK;

END;

将此代码块放在第一个插入语句之后。