Oracle Split

create or replace function split(p_str varchar2, p_sep varchar2 := ' ')
-------------------------------
--p_str :源字符串
--p_sep :分隔符
--功能：分割字符串为table
--使用示例：select * from table( split('1,2,3,4',','));
-------------------------------
  return type_split --自定义类型(create or replace type type_split as table of varchar2(512);)
  pipelined is
  l_idx  pls_integer; --list index
  v_list varchar2(512) := p_str;
begin
  loop
    l_idx := instr(v_list, p_sep);
    if l_idx > 0 then
      pipe row(substr(v_list, 1, l_idx - 1));
      v_list := substr(v_list, l_idx + length(p_sep));
    else
      pipe row(v_list);
      exit;
    end if;
  end loop;
  return;
end split;