# Functions
CheckIsAdmin 检查是否是管理员 @param userID @return isAdmin.
GetAdminLevel 获取管理员等级 @param userID @return level.
GetCommandInfo 获取命令信息 @param command @return info.
GetCommandInfoWithOpt 获取命令信息 @param option @return info.
GetDbConnection returns the db connection @return *gorm.DB.
# Structs
Administrator is the struct of administrator.
CommandInfo is the struct of command info.