错误：mysql
Error querying database. Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: COLLATION 'utf8mb4_general_ci' is not valid for CHARACTER SET 'utf8'sql
解决：code
database格式ci
Default Character Set = utf8mb4unicode
Default Collation = utf8mb4_unicode_ciio
从新插入数据便可jdbc