怎样将“Oracle”的外部表汉字转换为拼音

create or replace directory data_dir as '/app/oracle/admin/gsweb/bdump/'
/

-- copy dm_hz.csv to $ORACLE_BASE/admin/gsweb/bdump/
create table dm_hz
( 
HZ varchar2(10) ,
PY varchar2(10) ,
SD varchar2(10) ,
WB varchar2(10) ,
YXBZ varchar2(10) 
)
organization external
(type oracle_loader
default directory data_dir
access parameters
(
records delimited by newline
FIELDS TERMINATED BY ','
missing field values are null
( HZ ,
PY,
SD,
WB ,
YXBZ 
)
)
location ('dm_hz.csv')
)
/

@create_fun_GET_HZ_PY.sql

ok .end.