oracle中的split 字符串分割函数

Oracle中的Split函数首先需要定义 2 个类型1. Row 类型CREATE OR REPLACE TYPE ty_row_str_split  as object (strValue VARCHAR2 (4000))2. Table 类型CREATE OR REPLACE TYPE ty_tbl_str_split IS TABLE OF ty_row_str_split
创建函数：
CREATE OR REPLACE FUNCTION fn_split(p_str       IN VARCHAR2,
                                     p_delimiter IN VARCHAR2)
  RETURN ty_tbl_str_split IS
   j         INT := 0;
   i         INT := 1;
  len       INT := 0;
   len1      INT := 0;
  str       VARCHAR2(4000);
   str_split ty_tbl_str_split := ty_tbl_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) := ty_row_str_split(strValue => 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) := ty_row_str_split(strValue => str);
    END IF;
  END LOOP;


  RETURN str_split;
END fn_split;


使用样例：
select to_number(strvalue) as Value from table(fn_split('1,2,3',','))
select to_char(strvalue) as Value from table(fn_split('aa,bb,cc',','))