oracle 解析XML

 --解析xml，并获得xml数据的值
  select x.wf_orunid,extractvalue(xmltype(X.XMLDATA),'/Items/WFItem[@name="WH"]') as wh
 ,b.swh as swh
from bpm_archiveddata x,oa_bpm_docincome b
--多表关联查询更新数据
 update (
 select x.wf_orunid,extractvalue(xmltype(X.XMLDATA),'/Items/WFItem[@name="WH"]') as wh
 ,b.swh as swh
from bpm_archiveddata x,oa_bpm_docincome  b where x.wf_orunid=b.wf_orunid)

 set swh=wh