返回表的Oracle过程或函数

Question

如何创建一个返回SELECT结果集的过程或函数，就像我直接进行SELECT一样？

Answer 1

有关，

1. 功能：创建pipelined函数并将其用作表函数。

示例：

-- Create the types to support the table function.
DROP TYPE t_tf_tab;
DROP TYPE t_tf_row;

CREATE TYPE t_tf_row AS OBJECT (
  id           NUMBER,
  description  VARCHAR2(50)
);
/

CREATE TYPE t_tf_tab IS TABLE OF t_tf_row;
/

-- Build the table function itself.
CREATE OR REPLACE FUNCTION get_tab_tf (p_rows IN NUMBER) RETURN t_tf_tab AS
  l_tab  t_tf_tab := t_tf_tab();
BEGIN
  FOR i IN 1 .. p_rows LOOP
    l_tab.extend;
    l_tab(l_tab.last) := t_tf_row(i, 'Description for ' || i);
  END LOOP;

  RETURN l_tab;
END;
/

-- Test it.
SELECT *
FROM   TABLE(get_tab_tf(10))
ORDER BY id DESC;

        ID DESCRIPTION
---------- --------------------------------------------------
        10 Description for 10
         9 Description for 9
         8 Description for 8
         7 Description for 7
         6 Description for 6
         5 Description for 5
         4 Description for 4
         3 Description for 3
         2 Description for 2
         1 Description for 1

10 rows selected.

Example Source

1. 过程：SYS_REFCURSOR为OUT参数。