oracle处理in(字符串，字符串，字符串)

1.使用层次结构connect by ...：

select * from(select regexp_substr(replace('11110xx1xx2222','0xx1xx',','), '[^,]+', 1, rownum) n
                  from dual
                connect by rownum < 50) where n is not null
                

2使用自定义的分拆函数split,：

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 ' , ' , ' ))