{"id":200932,"date":"2025-05-06T12:01:03","date_gmt":"2025-05-06T04:01:03","guid":{"rendered":"https:\/\/server.hk\/cnblog\/200932\/"},"modified":"2025-05-06T12:01:03","modified_gmt":"2025-05-06T04:01:03","slug":"%e5%a6%82%e4%bd%95%e9%ab%98%e6%95%88%e8%8e%b7%e5%8f%96%e4%b8%80%e5%af%b9%e5%a4%9a%e5%85%b3%e7%b3%bb%e4%b8%ad%e5%85%b3%e8%81%94%e8%a1%a8%e7%9a%84%e6%9c%80%e6%96%b0%e8%ae%b0%e5%bd%95%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/200932\/","title":{"rendered":"\u5982\u4f55\u9ad8\u6548\u83b7\u53d6\u4e00\u5bf9\u591a\u5173\u7cfb\u4e2d\u5173\u8054\u8868\u7684\u6700\u65b0\u8bb0\u5f55\uff1f"},"content":{"rendered":"<p><b><\/b> <\/p>\n<h1>\u5982\u4f55\u9ad8\u6548\u83b7\u53d6\u4e00\u5bf9\u591a\u5173\u7cfb\u4e2d\u5173\u8054\u8868\u7684\u6700\u65b0\u8bb0\u5f55\uff1f<\/h1>\n<p>\u5c0f\u4f19\u4f34\u4eec\u6709\u6ca1\u6709\u89c9\u5f97\u5b66\u4e60\u5f88\u6709\u610f\u601d\uff1f\u6709\u610f\u601d\u5c31\u5bf9\u4e86\uff01\u4eca\u5929\u5c31\u7ed9\u5927\u5bb6\u5e26\u6765\uff0c\u4ee5\u4e0b\u5185\u5bb9\u5c06\u4f1a\u6d89\u53ca\u5230\uff0c\u82e5\u662f\u5728\u5b66\u4e60\u4e2d\u5bf9\u5176\u4e2d\u90e8\u5206\u77e5\u8bc6\u70b9\u6709\u7591\u95ee\uff0c\u6216\u8bb8\u770b\u4e86\u672c\u6587\u5c31\u80fd\u5e2e\u5230\u4f60\uff01<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241121\/1732194948673f32849f2be.jpg\" class=\"aligncenter\"><\/p>\n<p><strong>\u5982\u4f55\u9ad8\u6548\u89e3\u51b3\u4e00\u5bf9\u591a\u5173\u7cfb\u4e2d\u8bfb\u53d6\u6700\u65b0\u8bb0\u5f55\u7684\u95ee\u9898\uff1f<\/strong><\/p>\n<p>\u5f53\u9700\u8981\u4ece\u4e00\u5bf9\u591a\u5173\u7cfb\u8868\u4e2d\u83b7\u53d6\u5173\u8054\u8868\u7684\u6700\u65b0\u8bb0\u5f55\u65f6\uff0c\u76f4\u63a5\u4f7f\u7528\u5b50\u67e5\u8be2\u5f80\u5f80\u4f1a\u5f71\u54cd\u6027\u80fd\u3002\u4ee5\u4e0b\u63d0\u4f9b\u4e86\u4e00\u79cd\u66f4\u9ad8\u6548\u7684\u89e3\u51b3\u65b9\u6848\uff1a<\/p>\n<p>\u901a\u8fc7\u5185\u90e8\u8fde\u63a5\u5b9e\u73b0\uff0c\u9996\u5148\u5bf9\u5173\u8054\u8868\u6309\u65f6\u95f4\u964d\u5e8f\u6392\u5e8f\uff0c\u7136\u540e\u5bf9\u6392\u5e8f\u540e\u7684\u7ed3\u679c\u8fdb\u884c\u5206\u7ec4\uff0c\u6700\u540e\u518d\u6309\u7167\u65f6\u95f4\u964d\u5e8f\u6392\u5e8f\u3002\u6b64\u65b9\u6848\u6709\u6548\u907f\u514d\u4e86\u5b50\u67e5\u8be2\u5e26\u6765\u7684\u6027\u80fd\u5f00\u9500\u3002<\/p>\n<p>\u5b8c\u6574\u7684 sql \u67e5\u8be2\u5982\u4e0b\uff1a<\/p>\n<pre>SELECT\n    r.air_conditioner_id,\n    r.curr_temp,\n    r.curr_power,\n    r.time_millis\nFROM\n    air_conditioner_record r,\n(\n    SELECT\n        air_conditioner_id,\n        max( time_millis ) max_time\n    FROM\n        air_conditioner_record\n    WHERE\n        time_millis &amp;lt;= REPLACE(unix_timestamp(now(3)),'.','')\n    GROUP BY\n        air_conditioner_id\n) r2\nWHERE\n    r2.air_conditioner_id = r.air_conditioner_id\nAND r2.max_time = r.time_millis<\/pre>\n<p>\u8fd9\u4e2a\u67e5\u8be2\u901a\u8fc7\u5185\u90e8\u8fde\u63a5\u5c06\u8bbe\u5907\u8bb0\u5f55\u6309\u65f6\u95f4\u964d\u5e8f\u5206\u7ec4\uff0c\u5e76\u5339\u914d\u8bbe\u5907\u8868\u4e2d\u7684\u8bbe\u5907 id\u3002\u6700\u7ec8\uff0c\u53ef\u4ee5\u9ad8\u6548\u5730\u83b7\u53d6\u8bbe\u5907\u8868\u7684\u76f8\u5173\u4fe1\u606f\u4ee5\u53ca\u6700\u8fd1\u65f6\u95f4\u5904\u7684\u8bbe\u5907\u8bb0\u5f55\u3002<\/p>\n<p>\u4eca\u5929\u5173\u4e8e\u300a\u5982\u4f55\u9ad8\u6548\u83b7\u53d6\u4e00\u5bf9\u591a\u5173\u7cfb\u4e2d\u5173\u8054\u8868\u7684\u6700\u65b0\u8bb0\u5f55\uff1f\u300b\u7684\u5185\u5bb9\u5c31\u4ecb\u7ecd\u5230\u8fd9\u91cc\u4e86\uff0c\u662f\u4e0d\u662f\u5b66\u8d77\u6765\u4e00\u76ee\u4e86\u7136\uff01\u60f3\u8981\u4e86\u89e3\u66f4\u591a\u5173\u4e8e\u7684\u5185\u5bb9\u8bf7\u5173\u6ce8\u4e3b\u673a\u5b9d\u8d1d\u516c\u4f17\u53f7\uff01<\/p>\n<dl>\n<dt>\n 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