oracle spilt函数

CREATE OR REPLACE TYPE ty_str_split IS TABLE OF VARCHAR2 (4000)

CREATE OR REPLACE FUNCTION fn_split (p_str IN VARCHAR2, p_delimiter IN VARCHAR2)
  RETURN ty_str_split
IS
  j INT := 0;
  i INT := 1;
  len INT := 0;
  len1 INT := 0;
  str VARCHAR2 (4000);
  str_split ty_str_split := ty_str_split ();
BEGIN
  len := LENGTH (p_str);
  len1 := LENGTH (p_delimiter);

  WHILE j < len
  LOOP
    j := INSTR (p_str, p_delimiter, i);

    IF j = 0
    THEN
        j := len;
        str := SUBSTR (p_str, i);
        str_split.EXTEND;
        str_split (str_split.COUNT) := str;

        IF i >= len
        THEN
          EXIT;
        END IF;
    ELSE
        str := SUBSTR (p_str, i, j - i);
        i := j + len1;
        str_split.EXTEND;
        str_split (str_split.COUNT) := str;
    END IF;
  END LOOP;

  RETURN str_split;
END fn_split;

---test
select t.column_value,rownum row_ from  
table(  
    cast (  
        fn_split ('1,2,3,4,5,,7,,', ',') as ty_str_split  
    )  
) t  
-------------********************************************************
/*
 * name:        splitstr (字符串,获取的节点下标,分隔符)
 * author:      mmm.
 * date:        2012-09-03.
 * function:    返回字符串被指定字符分割后的指定节点字符串。
 * parameters:  str: 待分割的字符串。
                i: 返回第几个节点。当i为0返回str中的所有字符，当i 超过可被分割的个数时返回空。
                sep: 分隔符，默认逗号，也可以指定字符或字符串。当指定的分隔符不存在于str中时返回sep中的字符。
 * example:    select splitstr('abc,def', 1) as str from dual;  得到 abc
                select splitstr('abc,def', 3) as str from dual;  得到 空
 **************************************/
/* 创建 splitstr 函数 */
create or replace function splitstr(str in clob,
                                    i  in number := 0,
                                    sep in varchar2 := ',') return varchar2 is
  t_i    number;
  t_count number;
  t_str  varchar2(4000);
begin
  if i = 0 then
    t_str := str;
  elsif instr(str, sep) = 0 then
    t_str := sep;
  else
    select count(*) into t_count from table(fn_split(str, sep));
  
    if i <= t_count then
      select str
        into t_str
        from (select rownum as item, column_value as str
                from table(fn_split(str, sep)))
      where item = i;
    end if;
  end if;

  return t_str;
end;
----------splitstr(字符串,获取的节点下标,分隔符)
select splitstr('X-rapido&Lemon&Jennifer', 1, '&') word from dual;  -- X-rapido
select splitstr('X-rapido&Lemon&Jennifer', 2, '&') word from dual;  -- Lemon
select splitstr('X-rapido&Lemon&Jennifer', 3, '&') word from dual;  -- Jennifer
select splitstr('X-rapido&Lemon&Jennifer', 4, '&') word from dual;  -- 空字符串
select splitstr(b.group_no1,1,'#') from bms_fee_data_view b where b.be_income = 0