在PL/SQL中，将表作为参数，对其进行过滤并返回 [英] In PL/SQL, take a table as parameter, filter it and return it

问题描述

我在PL/SQL函数方面苦苦挣扎.我正在尝试编写一个函数，该函数将接受对象表，并根据某些条件(我打算针对其他表测试值)和返回过滤后的表来过滤该表.

I'm struggling with PL/SQL functions. I'm trying to write a function which would take in a table of objects, filter that table, based on some criteria (I intend to test values against other tables) and the return filtered table.

我的表类型定义如下:

CREATE TYPE test_obj AS OBJECT (test_id NUMBER(16,0), test_name VARCHAR2(50));
CREATE TYPE test_tbl AS TABLE OF test_obj;

该函数可能看起来像这样.

The function might look like this.

CREATE OR REPLACE
FUNCTION filterme(i_test IN test_tbl) RETURN test_tbl AS 
  o_test test_tbl;
BEGIN
  --NOT WORKING: SELECT INTO o_test FROM i_test t WHERE t.test_id > 10;
  RETURN o_test;
END filterme;

但是我要放什么呢?

推荐答案

CREATE OR REPLACE FUNCTION filterme(i_test IN test_tbl)
RETURN test_tbl
AS
  ret_tab test_tbl = test_tbl();
begin
  for i in 1 .. i_test.count loop
    if i_test(i).test_id > 10 then /* do the test */
      ret_tab.extend(1);
      ret_tab(ret_tab.count) := i_test(i);
    end if;
  end loop;
  return ret_tab;
end;

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