mysql：Illegal mix of collations错误

错误信息

Illegal mix of collations (gb2312_chinese_ci,IMPLICIT)
and (latin1_swedish_ci,COERCIBLE) for operation '='
//错误信息：字段字符集编码不同，不合法的连接

show full columns from user;命令查看tenant表各个字段的字符编码

alter table user convert to character set utf8;转换整个表的字段为utf8编码

ALTER TABLE

user

CHANGE

username

username

VARCHAR( 32) CHARACTER SET gb2312 COLLATE gb2312_bin NOT NULL 命令修改user表中的username字段的字符编码为gb2312类型。保证与整个数据库的字符编码gb2312一致。