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hinadong jzxyouok frlk panjiannan wuxianwei leokongwq tangkai007 rucky2013 zhangwei5095 ihoney android36524 manlan2 yehaozi caivery database-sharding frank0417 honglezhao pologood sqtds whycoder tang2992 panzhiping xiangtao jackyu86 lishiguang1983 xuebusi tangkuo gspandy wangfan9002 xingganfengxing yaozd freedream520 sunbiaozj lstarby learninghard-lizhi pullwindyuan junneyang carlguo2016 uwonder dmdaguan little6 leetia316 cnbillow user20161119 rekoe xiongxianze ruofeng3455 leexhwhy lan1tian alexandertuo wang-shun smadol oymin xiashuijun ibuwei yangmain smileeleven jxsd0084 prayhopewish rrifcode lianxinglu amtech visionwang dewey00 wjt2015 shiyuanbiao1990 dylanyuan1992 iloveruning citysay bendizhengdao boyscoding widon doraemonandrat raysonfang nzb15555196162 3hccm djyz2020 qdx123 liubo404 lcb14 geekcodingx 18664500701

public static String getDBInfoByUserId(int userId) {
        String num = String.valueOf((userId / 10) % 64 + 1);
        // 如果是个位数，前面补0
        return num.length() == 2 ? num : "0" + num;
    }

创建订单成功
订单ID：171531901471940
所在数据库：db57
所在表：t_order_7

        String num = String.valueOf((((userId / 10) % 64 + 1)-1)%8 + 1);