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SELECT
utl_raw.cast_to_varchar2(dbms_lob.substr(t.dync_xmlstr))
from t_wf_dcasedispatchmsg t
dbms_lob.substr函数用来操作数据库的大型对象，叫做大型对象定位器
utl_raw.cast_to_varchar2函数用来将blob转为varchar2
长度限制：2000
如果长度超出2000
SELECT utl_raw.cast_to_varchar2(DBMS_LOB.SUBSTR(t.command,2000,1)),
utl_raw.cast_to_varchar2(DBMS_LOB.SUBSTR(t.command,2000,2001))
from nc_his.ESB_INTERFACE_LOG_H t
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