把mysql里所有table的varchar字段的字符集，批量換成了utf8mb4/utf8mb4_unicode_ci ，以便能保存一些表情,結果存儲過程報錯；
這是因為臨時存儲表的編碼和表的編碼不符；
所以在游標使用到的變量修改編碼；
DECLARE qpCategory VARCHAR(32) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
即可！
Procedure execution failed 1267 - Illegal mix of collations (utf8mb4_unicode_ci,IMPLICIT) and (utf8mb4_general_ci,IMPLICIT) for operation '='
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