oracle - PL/SQL：在“WITH ... AS”子句之外使用“IF”语句

Question

我正在尝试编写一个使用子查询因子分解“WITH .. AS”的过程，但是当我在它之前使用“IF .. THEN”时，出现语法错误，我不知道该怎么写，有什么帮助?

  BEGIN
  OPEN my_SYS_REFCURSOR FOR
   IF .. IS NULL
   THEN
     WITH SomeName
          AS (SELECT.....);

Answer 1

您只需要将IF语句与OPEN：

declare
    my_sys_refcursor sys_refcursor;
begin
    if (1=1) then /* condition satisfied, cursor from some table */
        open my_sys_refcursor for
        with somename as ( select '1' as one from dual)
        select one
        from somename;
    else  /* condition not satisfied, select from different tables */
        open my_sys_refcursor for
        with someOthername as ( select 'one' as one from dual)
        select one
        from someOthername;
    end if;
end;