{"id":29908,"date":"2023-08-04T21:30:22","date_gmt":"2022-08-18T21:08:58","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8mongodb%e8%bf%9b%e8%a1%8c%e6%af%8f%e6%97%a5%e8%81%9a%e5%90%88\/"},"modified":"2025-08-12T16:31:14","modified_gmt":"2025-08-12T08:31:14","slug":"%e4%bd%bf%e7%94%a8mongodb%e8%bf%9b%e8%a1%8c%e6%af%8f%e6%97%a5%e8%81%9a%e5%90%88","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8mongodb%e8%bf%9b%e8%a1%8c%e6%af%8f%e6%97%a5%e8%81%9a%e5%90%88\/","title":{"rendered":"\u4f7f\u7528MongoDB\u8fdb\u884c\u6bcf\u65e5\u805a\u5408"},"content":{"rendered":"<p>\u901a\u8fc7\u521b\u5efa\u8868\u793a\u65e5\u671f\u7684\u952e\u5e76\u8fdb\u884cmapReduce\u64cd\u4f5c\uff0c\u53ef\u4ee5\u6309\u6bcf\u5929\u7edf\u8ba1\u6587\u6863\u7684\u6570\u91cf\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">function<\/span> <span class=\"nx\">map<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"kd\">var<\/span> <span class=\"nx\">dateKey<\/span> <span class=\"o\">=<\/span> <span class=\"kd\">function<\/span> <span class=\"p\">(<\/span><span class=\"nx\">d<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"kd\">var<\/span> <span class=\"nx\">yy<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">d<\/span><span class=\"p\">.<\/span><span class=\"nx\">getFullYear<\/span><span class=\"p\">();<\/span>\r\n    <span class=\"kd\">var<\/span> <span class=\"nx\">mm<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">d<\/span><span class=\"p\">.<\/span><span class=\"nx\">getMonth<\/span><span class=\"p\">()<\/span> <span class=\"o\">+<\/span> <span class=\"mi\">1<\/span><span class=\"p\">;<\/span>\r\n    <span class=\"kd\">var<\/span> <span class=\"nx\">dd<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">d<\/span><span class=\"p\">.<\/span><span class=\"nx\">getDate<\/span><span class=\"p\">();<\/span>\r\n    <span class=\"k\">if<\/span> <span class=\"p\">(<\/span><span class=\"nx\">mm<\/span> <span class=\"o\">&lt;<\/span> <span class=\"mi\">10<\/span><span class=\"p\">)<\/span> <span class=\"nx\">mm<\/span> <span class=\"o\">=<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">0<\/span><span class=\"dl\">'<\/span> <span class=\"o\">+<\/span> <span class=\"nx\">mm<\/span><span class=\"p\">;<\/span> \r\n    <span class=\"k\">if<\/span> <span class=\"p\">(<\/span><span class=\"nx\">dd<\/span> <span class=\"o\">&lt;<\/span> <span class=\"mi\">10<\/span><span class=\"p\">)<\/span> <span class=\"nx\">dd<\/span> <span class=\"o\">=<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">0<\/span><span class=\"dl\">'<\/span> <span class=\"o\">+<\/span> <span class=\"nx\">dd<\/span><span class=\"p\">;<\/span> \r\n\r\n    <span class=\"k\">return<\/span> <span class=\"nx\">yy<\/span> <span class=\"o\">+<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">-<\/span><span class=\"dl\">'<\/span> <span class=\"o\">+<\/span> <span class=\"nx\">mm<\/span> <span class=\"o\">+<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">-<\/span><span class=\"dl\">'<\/span> <span class=\"o\">+<\/span> <span class=\"nx\">dd<\/span><span class=\"p\">;<\/span> \r\n  <span class=\"p\">};<\/span>  \r\n  <span class=\"nx\">emit<\/span><span class=\"p\">(<\/span><span class=\"nx\">dateKey<\/span><span class=\"p\">(<\/span><span class=\"k\">this<\/span><span class=\"p\">.<\/span><span class=\"nx\">created_at<\/span><span class=\"p\">),<\/span> <span class=\"mi\">1<\/span><span class=\"p\">);<\/span> \r\n<span class=\"p\">}<\/span>\r\n<span class=\"kd\">function<\/span> <span class=\"nx\">reduce<\/span><span class=\"p\">(<\/span><span class=\"nx\">key<\/span><span class=\"p\">,<\/span> <span class=\"nx\">values<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"k\">return<\/span> <span class=\"nb\">Array<\/span><span class=\"p\">.<\/span><span class=\"nx\">sum<\/span><span class=\"p\">(<\/span><span class=\"nx\">values<\/span><span class=\"p\">);<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"kd\">var<\/span> <span class=\"nx\">daily_counts<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">db<\/span><span class=\"p\">.<\/span><span class=\"nx\">logs<\/span><span class=\"p\">.<\/span><span class=\"nx\">mapReduce<\/span><span class=\"p\">(<\/span><span class=\"nx\">map<\/span><span class=\"p\">,<\/span> <span class=\"nx\">reduce<\/span><span class=\"p\">,<\/span> <span class=\"p\">{<\/span> <span class=\"na\">query<\/span><span class=\"p\">:<\/span> <span class=\"p\">{},<\/span> <span class=\"na\">out<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span> <span class=\"na\">inline<\/span><span class=\"p\">:<\/span> <span class=\"mi\">1<\/span> <span class=\"p\">}<\/span> <span class=\"p\">});<\/span>\r\n<span class=\"nx\">daily_counts<\/span><span class=\"p\">.<\/span><span class=\"nx\">results<\/span><span class=\"p\">.<\/span><span class=\"nx\">forEach<\/span><span class=\"p\">(<\/span><span class=\"kd\">function<\/span> <span class=\"p\">(<\/span><span class=\"nx\">day<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"nx\">print<\/span><span class=\"p\">(<\/span><span class=\"nx\">day<\/span><span class=\"p\">.<\/span><span class=\"nx\">_id<\/span> <span class=\"o\">+<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">, <\/span><span class=\"dl\">'<\/span> <span class=\"o\">+<\/span> <span class=\"nx\">day<\/span><span class=\"p\">.<\/span><span class=\"nx\">value<\/span><span class=\"p\">);<\/span>\r\n<span class=\"p\">});<\/span>\r\n<\/code><\/pre>\n<p>\u5728\u4e2d\u6587\u4e2d\uff0c\u6211\u4eec\u5e94\u8be5\u53ef\u4ee5\u6309\u6708\u4efd\u6216\u6bcf\u5468\u7684\u65b9\u5f0f\u8fdb\u884c\u7c7b\u4f3c\u7684\u7edf\u8ba1\u3002<\/p>\n<p>\u6b64\u5916\uff0c\u5982\u679c\u60f3\u8981\u7edf\u8ba1\u9500\u552e\u989d\u7b49\u4e00\u4e9b\u6570\u503c\uff0c\u800c\u4e0d\u4ec5\u4ec5\u662f\u6587\u6863\u6570\u91cf\uff0c\u6211\u8ba4\u4e3a\u53ef\u4ee5\u5728 map \u7684\u6700\u540e\u8fdb\u884c\u5982\u4e0b\u64cd\u4f5c\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"nx\">emit<\/span><span class=\"p\">(<\/span><span class=\"nx\">dateKey<\/span><span class=\"p\">(<\/span><span class=\"k\">this<\/span><span class=\"p\">.<\/span><span class=\"nx\">created_at<\/span><span class=\"p\">),<\/span> <span class=\"k\">this<\/span><span class=\"p\">.<\/span><span class=\"nx\">amount<\/span><span class=\"p\">);<\/span>\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u901a\u8fc7\u521b\u5efa\u8868\u793a\u65e5\u671f\u7684\u952e\u5e76\u8fdb\u884cmapReduce\u64cd\u4f5c\uff0c\u53ef\u4ee5\u6309\u6bcf\u5929\u7edf\u8ba1\u6587\u6863\u7684\u6570\u91cf\u3002 function map() { [&hellip;]<\/p>\n","protected":false},"author":10,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[227],"class_list":["post-29908","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-227"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u4f7f\u7528MongoDB\u8fdb\u884c\u6bcf\u65e5\u805a\u5408 - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" 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