Question

我如何知道哪个SELECT生成了NO_DATA_FOUND？

示例：

CREATE [..]
DECLARE
--
BEGIN
  SELECT [...];   -- will this
  SELECT [...];   -- or this to generate NO_DATA_FOUND ?
EXEPCTION
WHEN NO_DATA_FOUND THEN
  [...]
END;

Answer 1

你可以这样做：

DECLARE
--
BEGIN
  BEGIN
    SELECT [...];   -- will this
  EXCEPTION
    WHEN NO_DATA_FOUND THEN
      [...]
  END;
  BEGIN
    SELECT [...];   -- or this to generate NO_DATA_FOUND ?
  EXCEPTION
    WHEN NO_DATA_FOUND THEN
      [...]
  END;
END;

或者：

DECLARE
  l_where_am_i number;
BEGIN
  l_where_am_i := 1;
  SELECT [...];   -- will this
  l_where_am_i := 2;
  SELECT [...];   -- or this to generate NO_DATA_FOUND ?
EXEPCTION
  WHEN NO_DATA_FOUND THEN
    CASE l_where_am_i
       WHEN 1 THEN [...]
       WHEN 2 THEN [...]
    END CASE;
END;

Answer 2

另一种选择是使用dbms_utility.format_error_backtrace，如下所示（尽管最好将该数据发送到错误记录例程）。此函数将为您提供发生错误的实际行号。

CREATE [..]
DECLARE
--
BEGIN
  SELECT [...];   -- will this
  SELECT [...];   -- or this to generate NO_DATA_FOUND ?
EXEPCTION
WHEN NO_DATA_FOUND THEN
  [...]
  dbms_output.put_line(dbms_utility.format_error_backtrace());
END;

NO_DATA_FOUND异常

2 个答案: