ORA-01403:找不到Select into的数据

Question

我得到ORA-01403: no data found以下查询的异常.这个错误的可能性有哪些？

SELECT trim(name)
  INTO fullname
  FROM ( SELECT n.name
         FROM directory dir, store n
        WHERE dir.name = n.name
          AND dir.status NOT IN ('F', 'L', 'M')
        ORDER BY n.imp, dir.date)
  WHERE rownum <= 1;

我该如何处理这个错误？

Answer 1

虽然你已经把条件放在哪里,但更好的方法是处理未找到记录的情况或"找不到数据"错误.我会在上面编写代码,用它自己的BEGIN/EXCEPTION/END块包装SELECT语句.

代码可能是这样的:

 BEGIN
   SELECT trim(name) 
   INTO fullName
   FROM
     (SELECT n.name
     FROM directory dir,
        store n
     WHERE dir.name            = n.name
     AND dir.STATUS NOT                IN ('F','L','M')           
     ORDER BY n.imp,
        dir.date
     )
   WHERE rownum    <= 1;
 EXCEPTION
   WHEN NO_DATA_FOUND THEN
     fullName = NULL;
 END;

Answer 2

如果 Sandeep描述的标准异常处理似乎有很大的开销(就像在我的情况下那样)并且您对某个NULL或某个单独的<not found>值没有问题,那么您可能只需将其转换为:

select  col  into  v_foo  from  bar  where 1=0  -- would provoke ORA-01403

=>没有提出ORA-01403:

-- if NULL would be fine:

select  (select  col  from  bar  where 1=0)  into  v_foo  from dual

-- if individual "NOT_FOUND" value should be set to avoid standard exception handling:
--    (it depends on your col type, so it could e.g. be 'NOT_FOUND' or -1 
--     or to_date( 'yyyy-mm-dd', '2100-01-01') )

select  nvl(  (select  col  from  bar  where 1=0),  'NOT_FOUND'  )  into  v_foo  from dual