Question

我刚从Oracle BI Publisher开始，我真的不知道如何与我的任务相处。

我的项目是询问用户参数（确定），如果用户选择01，我应该只显示＆＃39; 1月＆＃39;有一些数据。如果用户选择03，我应该显示3列，＆＃39; 1月＆＃39; ＆＃39;二月＆＃39; ＆＃39;行军＆＃39;每个都有一些数据。

我的所有专栏都在12月之前，我根本不知道如何根据给定的参数选择不同数量的列。

已编辑，添加代码！

declare
p SYS_REFCURSOR;

begin

if (:month)=02 then
open p for select 'bazisev' as evtipus, month-1 as month, january, february
    from db.tablename where month=(:month)-1 and sorszam between 4 and 15
  union all
  select 'targyev' as evtipus, month, january, february 
    from db.tablename where month=(:month) and sorszam between 4 and 15
  union all
  select 'targyev/bazisev' as evtipus, month, january, february
    from db.tablename where month=(:month) and sorszam between 32 and 39 
  order by sorszam;

elsif (:month)=01 then

open p for select 'bazisev' as evtipus, month-1 as month, january
    from db.tablename where month=(:month)-1 and sorszam between 4 and 15
  union all
  select 'targyev' as evtipus, month, january
    from db.tablename where month=(:month) and sorszam between 4 and 15
  union all
  select 'targyev/bazisev' as evtipus, month, january
    from db.tablename where month=(:month) and sorszam between 32 and 39 
  order by sorszam;

end if;

end

所以现在我用2个月这样做，但它说：ORA-00907：错过右括号

我很确定我拥有所需的所有括号。有什么建议吗？

Answer 1

如果用户选择01，我应该只显示'january'和一些数据。如果用户选择03，我应该显示3列，“1月”，“2月”，“3月”，每行都有一些数据。

纯SQL中不能包含动态列。您需要使用 EXECUTE IMMEDIATE 以编程方式（ab）执行此操作。在IF-ELSE构造中，准备动态SQL ，然后根据输入值执行它。

伪代码：您需要处理输出类型。

DECLARE
   v_str VARCHAR2(2000);
BEGIN
   IF :id = 1
      THEN v_str := 'SELECT january FROM table_name';
   ELSIF :id = 2
      THEN v_str := 'SELECT january, february FROM table_name';
   ELSIF...
   .
   .
   .
   ELSIF :id = 12
      THEN v_str := 'SELECT january, february...,december FROM table_name';
   END IF;

   EXECUTE IMMEDIATE v_str...
END;

另一种方法是使用 REFCURSOR 。例如，

DECLARE

r SYS_REFCURSOR;

BEGIN
   IF :id = 1
      THEN open r for SELECT january FROM table_name;
   ELSIF :id = 2
      THEN open r for SELECT january, february FROM table_name;
   ELSIF...
   .
   .
   .
   ELSIF :id = 12
      THEN open r for SELECT january, february...,december FROM table_name';
   END IF;
END;

Oracle BI Publisher，按参数选择不同的列

1 个答案: