oracle中实现类似SPLIT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;
/

测试
create or replace procedure test as
  CURSOR c IS
    SELECT *
      FROM TABLE(CAST(fn_split('1|12|123|1234|12345| |', '|') AS
                      ty_str_split));
  r c%ROWTYPE;
  begin
  OPEN c;
  LOOP
    FETCH c
      INTO r; 
    EXIT WHEN c%NOTFOUND;
    DBMS_OUTPUT.put_line(r.column_value);
  END LOOP;
  CLOSE c;
  end;