Oracle以逗号分隔的字符串拆分为多行数据实例详解

select bs from cs1_0 where slid='201804100038'
--正则分割后的第一个值
SELECT REGEXP_SUBSTR((select bs from cs1_0 where slid='201804100038'),'[^,]+',1,1,'i') as 分割后结果 FROM DUAL;
--获取一个多个数值的列，从而能够让结果以多行的形式展示出来 
SELECT LEVEL FROM DUAL CONNECT BY LEVEL <=5;
--将上面REGEXP_SUBSTR的occurrence（标识第几个匹配组）实现动态参数，使用 connect by组合起来
SELECT REGEXP_SUBSTR((select bs from cs1_0 where slid='201804100038'),'[^,]+',1,LEVEL,'i') as 分割后结果 FROM DUAL CONNECT BY LEVEL <=5;
--优化一下（动态获匹配组标识行数）
select regexp_substr((select bs from cs1_0 where slid='201804100038'),'[^,]+',1,LEVEL,'i') as 分割后结果 from dual 
connect by level <= length((select bs from cs1_0 where slid='201804100038'))-length(regexp_replace((select bs from cs1_0 where slid='201804100038'),',',''))+1;

1）建立TYPE类型


CREATE OR REPLACE TYPE strsplit_type_12 IS TABLE OF VARCHAR2 (4000)

2）建立function存储函数
create or replace function strsplit_66(p_value varchar2,p_split varchar2 )  --字符串，切割符
--根据特定字符来切割字符串
 return strsplit_type_12
  pipelined is
  v_idx       integer;
  v_str       varchar2(500);
  v_strs_last varchar2(4000) := p_value;

begin
  loop
    v_idx := instr(v_strs_last, p_split);
    exit when v_idx = 0;
    v_str       := substr(v_strs_last, 1, v_idx - 1);
    v_strs_last := substr(v_strs_last, v_idx + 1);
    pipe row(v_str);
  end loop;
  pipe row(v_strs_last);
  return;
end strsplit_66;

SELECT ROWNUM 序号, a.* FROM TABLE(strsplit_66((select bs from cs1_0 where slid='201804100038'), ',')) a;