Enable or disable unicode decode mode.
In this mode, if the server supports UTF-8 then non-binary text
strings in results are automatically decoded to (possibly wide)
unicode strings. Not enabled by default.
The statement "SET character_set_results = utf8
" is sent
to the server to enable the mode. When the mode is disabled,
"SET character_set_results = xxx
" is sent, where
xxx
is the connection charset that get_charset returns.