数据库逗号分隔查询函数

数据库字段按照逗号进行分隔组装成临时表查询成表结构展示：

create or replace function my_split(piv_str       in varchar2,
                                    piv_delimiter in varchar2)
--l_piv_str 为字符串，piv_delimiter 为分隔符
 return mytype is
  j        int := 0;
  i        int := 1;
  len      int := 0;
  len1     int := 0;
  str      varchar2(8000);
  my_split mytype := mytype();

  l_piv_str varchar2(8000);
begin
  SELECT ltrim(rtrim(piv_str, piv_delimiter), piv_delimiter)
    into l_piv_str
    FROM dual;
  if length(l_piv_str) < 1 then
    return null;
  end if;
  len  := length(l_piv_str);
  len1 := length(piv_delimiter);
  while j < len loop
    j := instr(l_piv_str, piv_delimiter, i);
    if j = 0 then
      j   := len;
      str := substr(l_piv_str, i);
      my_split.extend;
      my_split(my_split.count) := str;
      if i >= len then
        exit;
     
      end if;
    else
      str := substr(l_piv_str, i, j - i);
      i   := j + len1;
      my_split.extend;
      my_split(my_split.count) := str;
    end if;
  end loop;
  return my_split;
end my_split;

--查询示例
select column_value from table(my_split('1,2,3,4,5', ','));
--查询结果

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