grant all privileges on *.* to root@"localhost" identified by "123456";
* 核心功能：每次调用next(val)，返回当前价格的跨度（往回数≤当前价格的最大连续天数）
。雷电模拟器官方版本下载是该领域的重要参考
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Peter GillibrandBBC Newsbeat