Oracle 正則 一行轉多行

select regexp_substr(bjdm||',

', '
[^,]+
', 1, level, '
i') as
str,bjdm from
valueweekinfo 
connect 
bylevel
<= length(bjdm) - length(regexp_replace(bjdm, '
,', '')) +
1;

可以將 bjdm 換成 '01,02,03,04' , valueweekinfo 換成dual 檢視結果

select regexp_substr(zzjs, '

[^,]+
', 1, rownum, '
i') str,zzjs from
(select zzjs from bjpjxxb   group
byzzjs )
connect 
by rownum <= length(zzjs) - length(regexp_replace(zzjs, '
,', ''))+
1

有時用rownum會出現 一些問題,結合上面的level使用

with test as

(select
1 id1, '
aaa,bbb,ccc,ddd
'id2
from
dual
union
allselect
2 id1, '
eee,fff,ggg,hhh,kkkk,ivwshjj
' id2 from
dual)
select
id1,
substr(t.ca,
instr(t.ca, ',
', 1, d.lv) +1,
instr(t.ca, ',
', 1, d.lv +
1) -
(instr(t.ca, ',
', 1, d.lv) +
1)) as
d    
from (select
id1,
','|| id2 ||',
'asca,                length(id2 ||'
,') - nvl(length(replace(id2, '
,')), 0) as
cnt           
from
test) t,
(select
level lv from dual connect by
level
<=
100) d
where d.lv <=
t.cnt
order
byid1
select substr(t.classid,instr(t.classid, '
,', 1, d.lv) +1,
instr(t.classid, ',
', 1, d.lv +
1) -
(instr(t.classid, ',
', 1, d.lv) +
1))  str,classid,vid from
(select vid,','
|| classid ||',
'classid
,length(classid ||'
,') - nvl(length(replace(classid, '
,')), 0) as cnt from
classvedio 
where createtime between
'2015-09-01
'and
'2015-12-31
'group
byclassid,vid) t,
(select
level lv from dual connect by
level
<=
100) d
where d.lv <=
t.cnt
order
by vid,str
desc

select regexp_substr(classid, '

[^,]+
', 1, lv, '
i') as
str,classid,vid,lv from
(select
*from
(select vid,','
|| classid ||',
'classid
,length(classid ||'
,') - nvl(length(replace(classid, '
,')), 0) as
cntfrom
classvedio) c,
(select
level lv from dual connect by
level
<= (select
max(length(classid))  from
classvedio)) d
where d.lv <=
c.cnt
order
by vid desc,lv asc
)

最終完成版本

///

///將某錶的某列拆分成多行資料,返回的結構為
///str,拆分出來的每乙個字段
///lv,拆分行數
///primarycols 
///key
///        ///
表名        ///
表主鍵列
///要拆分的列
///分隔字串
///public
static
string getcommand(string tablename, string primarycols, string key,string
splitchar)
, '[^]+', 1, lv, 'i') as str,,,lv from (
", key, primarycols,splitchar));
string.format("
select * from (select ,'' ||  || '' 
", primarycols, key,splitchar));
string.format( "
,length( || '') - nvl(length(replace(, '')), 0) as cnt
",key,splitchar));
string.format( "
from ) c,
",tablename));
string.format("
(select level lv from dual connect by level <= (select max(length())  from )) d
", key, tablename));
string.format( "
where d.lv <= c.cnt order by ,lv asc
",primarycols));")
");return
sb.tostring();
}

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