{"id":26099,"date":"2024-11-24T10:50:39","date_gmt":"2024-11-24T02:50:39","guid":{"rendered":"https:\/\/fwq.ai\/blog\/26099\/"},"modified":"2024-11-24T10:50:39","modified_gmt":"2024-11-24T02:50:39","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-2","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/26099\/","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><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/001\/246\/273\/173080026380537.jpg\" class=\"aligncenter\" title=\"\u5982\u4f55\u9ad8\u6548\u83b7\u53d6\u4e00\u5bf9\u591a\u5173\u7cfb\u4e2d\u5173\u8054\u8868\u7684\u6700\u65b0\u8bb0\u5f55\uff1f\u63d2\u56fe\" alt=\"\u5982\u4f55\u9ad8\u6548\u83b7\u53d6\u4e00\u5bf9\u591a\u5173\u7cfb\u4e2d\u5173\u8054\u8868\u7684\u6700\u65b0\u8bb0\u5f55\uff1f\u63d2\u56fe\" \/><\/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 &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>  \u767b\u5f55\u540e\u590d\u5236   <\/p>\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>\u4ee5\u4e0a\u5c31\u662f\u5982\u4f55\u9ad8\u6548\u83b7\u53d6\u4e00\u5bf9\u591a\u5173\u7cfb\u4e2d\u5173\u8054\u8868\u7684\u6700\u65b0\u8bb0\u5f55\uff1f\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5982\u4f55\u9ad8\u6548\u89e3\u51b3\u4e00\u5bf9\u591a\u5173\u7cfb\u4e2d\u8bfb\u53d6\u6700\u65b0\u8bb0\u5f55\u7684\u95ee\u9898\uff1f \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 \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 \u5b8c\u6574\u7684 sql \u67e5\u8be2\u5982\u4e0b\uff1a SELECT r.air_conditioner_id, r.curr_temp, r.curr_power, r.time_millis FROM air_conditioner_record r, ( SELECT air_conditioner_id, max( time_millis ) max_time FROM air_conditioner_record WHERE time_millis &lt;= REPLACE(unix_timestamp(now(3)),&#8217;.&#8217;,&#8221;) GROUP BY air_conditioner_id ) r2 WHERE r2.air_conditioner_id = r.air_conditioner_id AND r2.max_time = r.time_millis \u767b\u5f55\u540e\u590d\u5236 \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 \u4ee5\u4e0a\u5c31\u662f\u5982\u4f55\u9ad8\u6548\u83b7\u53d6\u4e00\u5bf9\u591a\u5173\u7cfb\u4e2d\u5173\u8054\u8868\u7684\u6700\u65b0\u8bb0\u5f55\uff1f\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-26099","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/26099","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=26099"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/26099\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=26099"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=26099"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=26099"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}