oracle – 如何将内联表作为参数发送到接收表的函数？

2023年5月11日 153次阅读

我需要在WITH子句中使用来自下面的代码的returning_tbl(),然后将使用WITH子句创建的内联表作为参数传递给函数.就像在using_tbl_v2中一样(此时不起作用)

using_tbl_v1只是一个有效的例子(但对我来说很简单).

我意识到,一旦我创建了一个内联表,我就会退出PLSQL模式并进入SQL模式.但是如何返回PLSQL模式以将original_tbl传递给receiving_tbl(…)

create or replace type SOME_OBJ force as object (
  SOME_VARCHAR varchar2(20 byte)
);

create or replace type SOME_TBL is table of SOME_OBJ;


create or replace function returning_tbl
  return SOME_TBL pipelined is

begin
  for current_row in (
    select
      'SOME_VALUE' as SOME_VARCHAR
    from dual
  )
  loop
    pipe row (
      SOME_OBJ(
        current_row.SOME_VARCHAR
      )
    );
  end loop;
  return;
END returning_tbl;

select * from table(returning_tbl());


create or replace function receiving_tbl(tbl SOME_TBL)
  return SOME_TBL pipelined is

begin
  for current_row in (
    with filtered_tbl as (
      select
        SOME_VARCHAR
      from table(tbl)
      where SOME_VARCHAR = 'SOME_VALUE'
    )
    select * from filtered_tbl
  )
  loop
    pipe row (
      SOME_OBJ(
        current_row.SOME_VARCHAR
      )
    );
  end loop;
  return;
END receiving_tbl;


select * from table(receiving_tbl(returning_tbl()));


create or replace function using_tbl_v1
  return SOME_TBL pipelined is

begin
  for current_row in (
    with original_tbl as (
      select
        SOME_VARCHAR
      from table(returning_tbl())
      where SOME_VARCHAR = 'SOME_VALUE'
    ),
    outside_inlined_tbl as ( --just as example
      select * from table(receiving_tbl(returning_tbl()))
    )
    select * from outside_inlined_tbl
  )
  loop
    pipe row (
      SOME_OBJ(
        current_row.SOME_VARCHAR
      )
    );
  end loop;
  return;
END using_tbl_v1;


select * from table(using_tbl_v1());


create or replace function using_tbl_v2
  return SOME_TBL pipelined is

begin

  for current_row in (
    with original_tbl as (
      select
        SOME_VARCHAR
      from table(returning_tbl())
      where SOME_VARCHAR = 'SOME_VALUE'
    ),
    outside_tbl as (
      select * from table(receiving_tbl( original_tbl ))
    )
    select * from outside_tbl
  )
  loop
    pipe row (
      SOME_OBJ(
        current_row.SOME_VARCHAR
      )
    );
  end loop;
  return;
END using_tbl_v2;


select * from table(using_tbl(_v2));

最佳答案 更换：

with original_tbl as (
  select
    SOME_VARCHAR
  from table(returning_tbl())
  where SOME_VARCHAR = 'SOME_VALUE'
),
outside_tbl as (
  select * from table(receiving_tbl( original_tbl
  ))
)
select * from outside_tbl

附：

with original_tbl as (
  select
    SOME_VARCHAR
  from table(returning_tbl())
  where SOME_VARCHAR = 'SOME_VALUE'
),
outside_tbl as (
  select * from table(receiving_tbl(
     (select cast(collect(SOME_OBJ(SOME_VARCHAR)) as SOME_TBL) from original_tbl)
  ))
)
select * from outside_tbl

我想补充一些关于这里发生的事情的简单解释.但是这个例子太复杂了我不确定在这里学习是否有任何简单的教训.

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