SQL plugin shows "?" when retrieving Chinese entries

Hello,

SQL plugin it show ? when retrieve Chinese entries ,the table is already UTF8 format. I use R also have the same problem, and they use "DBMSencoding="utf8" parameter e.g.
channel <-odbcConnect("mysql64",uid="root",pwd="xx",DBMSencoding="utf8") for solve it

THX adv

ODBC plugin is ANSI, not unicode.

Thx your reply.
I have already changed database,table and fields to big5 code. But it still only show ?.
Do you give me some hits and steps how to solve it?