PL / SQL：在'WITH ... AS'子句之外使用'IF'语句

Question

我正在尝试编写一个程序，我使用Subquery Factoring'WITH .. AS'，但是当我在它之前使用'IF .. THEN'时，我得到语法错误，我不知道应该怎么写它，有什么帮助吗？

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

Answer 1

您只需将IF语句与OPEN：

分开即可

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;