使用流水线表函数和关联表从具有函数的表中选择

Question

作为此选择的结果，我需要返回表格。传递给函数 opredelyaet 的参数，关联数据数组将从该函数中显示为表格：

select * from table(task_2.get_con_coll('save'));

我写了这段代码，对我来说它是正确的，我没有看到我错过了，或者它没有铺平

С创建一个对象

-- the creation of an array type
create or replace type con_coll_type is object(
    id        integer,
    user_name varchar2(255));

然后他创建了包

create or replace package task_2 is
  /*
  -- may need to be so?
      type con_coll_type is record(
        id        integer,
        user_name varchar(255));
  -- */
  --Create associative array
  type con_coll_t is table of con_coll_type index by varchar2(255);
  -- need using this   
  function get_con_coll(coll_name varchar2) return con_coll_t
    pipelined;

end task_2;

create or replace package body task_2 is

  function get_con_coll(coll_name varchar2) return con_coll_t
    pipelined is
    indx        varchar(255);
    coll_edit   con_coll_t;
    coll_delete con_coll_t;
    coll_save   con_coll_t;
  begin
-- Filling collection
    coll_edit(1) := con_coll_type(1, 'some_name_1');
    coll_edit(2) := con_coll_type(2, 'some_name_2');
    coll_delete(3) := con_coll_type(3, 'some_name_3');
    coll_delete(4) := con_coll_type(4, 'some_name_4');
    coll_save(5) := con_coll_type(5, 'some_name_5');
    coll_save(6) := con_coll_type(6, 'some_name_6'); 

-- If the parameter is passed to the function "Save" - ​​a collection of output
    if coll_name = 'save' then
      indx := coll_save.first;
      loop
        exit when indx is null;
      -- pipelined output
        pipe row(con_coll_type(coll_save(indx).id,
                               coll_save(indx).user_name));
        indx := coll_save.next(indx);
      end loop;
    end if;

  end get_con_coll;

end task_2;

我的代码有什么问题？我无法理解我错过了什么。

Answer 1

这就是我想要的，也是我的成就

create or replace type con_coll_type is object(id integer,
                                               user_name varchar2(255));

create or replace type con_coll_t is table of con_coll_type;


create or replace package task_2 is

  type list_of_oper is table of con_coll_t index by varchar2(255);

  function get_con_coll(coll_name varchar2) return con_coll_t
    pipelined;

end task_2;

create or replace package body task_2 is

  function get_con_coll(coll_name varchar2) return con_coll_t
    pipelined is
    indx      varchar(255);
    indx_2    varchar(255);
    coll_main list_of_oper;
  begin

    coll_main('edit') := con_coll_t(con_coll_type(1, 'some_name_1'),
                                    con_coll_type(2, 'some_name_2'));
    coll_main('delete') := con_coll_t(con_coll_type(3, 'some_name_3'),
                                      con_coll_type(4, 'some_name_4'));
    coll_main('save') := con_coll_t(con_coll_type(5, 'some_name_5'),
                                    con_coll_type(6, 'some_name_6'));

    indx := coll_main.first;
    loop
      exit when indx is null;
      if indx = coll_name then
        indx_2 := coll_main(indx).first;
        loop
          exit when indx_2 is null;
                    pipe row(coll_main(indx)(indx_2));
          /*pipe row(con_coll_type(coll_main(indx)(indx_2).id,
coll_main(indx)(indx_2).user_name));*/
          indx_2 := coll_main(indx).next(indx_2);
        end loop;
      end if;
      indx := coll_main.next(indx);
    end loop;

    return;

  end get_con_coll;

end task_2;

select *
  from table(task_2.get_con_coll('edit'))
union all
select *
  from table(task_2.get_con_coll('delete'))
union all
select *
  from table(task_2.get_con_coll('save'));

Answer 2

首先，Table类型应该是包外的：
create type con_coll_t is table of con_coll_type;

而且，如果你的类型有默认值，你可以像这样实现它们：

  coll_delete con_coll_t;
  begin
    coll_delete := con_coll_t(con_coll_type(3, 'some_name_3'),
                              con_coll_type(4, 'some_name_4'));
  end;

话虽如此，我认为您的通用代码应该是这样的：

 -- the creation of an array type
 create or replace type con_coll_type is object(
     id        integer,
     user_name varchar2(255));

 create or replace type con_coll_t is table of con_coll_type;          

 create or replace package task_2 is
   function get_con_coll(coll_name varchar2) return con_coll_t
     pipelined;
 end task_2;

 create or replace package body task_2 is

   function get_con_coll(coll_name varchar2) return con_coll_t
     pipelined is
     indx        varchar(255);
     coll_edit   con_coll_t;
     coll_delete con_coll_t;
     coll_save   con_coll_t;
   begin
 -- Filling collection
     coll_edit    := con_coll_t( con_coll_type(1, 'some_name_1')

                               , con_coll_type(2, 'some_name_2'));
     coll_delete  := con_coll_t( con_coll_type(3, 'some_name_3')
                               , con_coll_type(4, 'some_name_4'));
     coll_save    := con_coll_t( con_coll_type(5, 'some_name_5')
                               , con_coll_type(6, 'some_name_6'));

 -- If the parameter is passed to the function "Save" - ??a collection of output
     if coll_name = 'save' then
       indx := coll_save.first;
       loop
         exit when indx is null;
       -- pipelined output
         pipe row(con_coll_type(coll_save(indx).id,
                                coll_save(indx).user_name));
         indx := coll_save.next(indx);
       end loop;
     end if;

   end get_con_coll;

 end task_2;