1.mysql字符集与插入数据字符集不匹配

USE 数据库名称
SHOW VARIABLES LIKE 'character%'
SET character_set_server=utf8;
SET character_set_database=utf8;

2.表属性字符集与插入数据字符集不匹配

SHOW FULL COLUMNS  FROM  表名称
ALTER TABLE  表名   CONVERT TO CHARACTER SET utf8 COLLATE utf8_general_ci