How to permanently set Mysql to utf8 encoding?

The phenomenon and background of the problem

C++ Output MySQL Chinese garbled in , I think it's MySQL Default GBK The problem of

My solution ideas and tried methods

set character_set_client=utf8
set character_set_connection=utf8
set character_set_results=utf8
The above command has been tried , Only the current window is valid , Invalid reopening
my.ini client Increased default_character-set=utf8 Something like that
How to permanently set The top three are utf8？

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Take the answer ：

set Back plus persist , such as set persist character_set_results=utf8

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