{"id":720,"date":"2019-03-18T10:22:18","date_gmt":"2019-03-18T02:22:18","guid":{"rendered":"https:\/\/wyxxt.org.cn\/?p=720"},"modified":"2023-12-04T17:02:57","modified_gmt":"2023-12-04T09:02:57","slug":"mongodb-aggregate%e8%81%9a%e5%90%88%e6%93%8d%e4%bd%9c","status":"publish","type":"post","link":"https:\/\/wyxxt.org.cn\/?p=720","title":{"rendered":"mongodb-aggregate\u805a\u5408\u64cd\u4f5c"},"content":{"rendered":"

redact<\/h3>\n

redaction \u4fee\u8ba2\/\u6821\u9a8c\uff0c\u610f\u601d\u662f\u5bf9\u6587\u6863\u5185\u5bb9\u8fdb\u884c\u8fc7\u6ee4\uff0c\u9009\u62e9\u4e00\u4e9b\u8fc7\u6ee4\u6216\u4fdd\u7559\u7684\u4fe1\u606f\u3002<\/em><\/strong>
\n$$DESCEND \u8fd4\u56de\u5f53\u524d\u7b49\u7ea7\u7684\u6587\u6863\uff0c\u6392\u9664\u6389\u8be5\u7b49\u7ea7\u4e0b\u7684\u5185\u5d4c\u7b49\u7ea7\u6587\u6863\u3002
\n$$PRUNE \u6392\u9664\u6389\u6ee1\u8db3\u6761\u4ef6\u7684\u5f53\u524d\u7b49\u7ea7\u53ca\u5176\u4e0b\u5c5e\u7b49\u7ea7\u7684\u6240\u6709\u5185\u5bb9\uff0c\u800c\u4e0d\u518d\u68c0\u67e5\u5176\u5185\u5d4c\u6587\u6863\u662f\u5426\u8fd8\u6709\u6ee1\u8db3\u6761\u4ef6\u7684\u5185\u5bb9\u3002
\n$$KEEP \u4fdd\u7559\u6ee1\u8db3\u6761\u4ef6\u7684\u5f53\u524d\u7b49\u7ea7\u53ca\u5176\u4e0b\u5c5e\u7b49\u7ea7\u7684\u6240\u6709\u5185\u5bb9\uff0c\u800c\u4e0d\u518d\u68c0\u67e5\u742a\u5185\u5d4c\u6587\u6863\u662f\u5426\u6ee1\u8db3\u6761\u4ef6\u7684\u5185\u5bb9\u3002<\/p>\n

\u793a\u4f8b\uff1a<\/h4>\n
db.sampleapplications.aggregate(\n{\n    $unwind: {path: \"$sample\"}\n}, {\n    $match: {\"sample.state\": \"approved\"}\n}, {\n    $project: {_id: 0, sample: 1}\n}, {\n    $redact: {\n        $cond: {\n            if: {$eq: [\"$sample.apply_amount\", \"$sample.approved_amount\"]},\n            then: \"$$PRUNE\",\n            else: \"$$KEEP\"\n        }\n    }\n}\n)\n\n<\/code><\/pre>\n
\u7ba1\u9053\u7684\u6982\u5ff5
\n\u7ba1\u9053\u5728Unix\u548cLinux\u4e2d\u4e00\u822c\u7528\u4e8e\u5c06\u5f53\u524d\u547d\u4ee4\u7684\u8f93\u51fa\u7ed3\u679c\u4f5c\u4e3a\u4e0b\u4e00\u4e2a\u547d\u4ee4\u7684\u53c2\u6570\u3002<\/p>\n
MongoDB\u7684\u805a\u5408\u7ba1\u9053\u5c06MongoDB\u6587\u6863\u5728\u4e00\u4e2a\u7ba1\u9053\u5904\u7406\u5b8c\u6bd5\u540e\u5c06\u7ed3\u679c\u4f20\u9012\u7ed9\u4e0b\u4e00\u4e2a\u7ba1\u9053\u5904\u7406\u3002\u7ba1\u9053\u64cd\u4f5c\u662f\u53ef\u4ee5\u91cd\u590d\u7684\u3002<\/p>\n
\u8868\u8fbe\u5f0f\uff1a\u5904\u7406\u8f93\u5165\u6587\u6863\u5e76\u8f93\u51fa\u3002\u8868\u8fbe\u5f0f\u662f\u65e0\u72b6\u6001\u7684\uff0c\u53ea\u80fd\u7528\u4e8e\u8ba1\u7b97\u5f53\u524d\u805a\u5408\u7ba1\u9053\u7684\u6587\u6863\uff0c\u4e0d\u80fd\u5904\u7406\u5176\u5b83\u7684\u6587\u6863\u3002<\/p>\n
\u8fd9\u91cc\u6211\u4eec\u4ecb\u7ecd\u4e00\u4e0b\u805a\u5408\u6846\u67b6\u4e2d\u5e38\u7528\u7684\u51e0\u4e2a\u64cd\u4f5c\uff1a<\/p>\n
    \n
  • $project\uff1a\u4fee\u6539\u8f93\u5165\u6587\u6863\u7684\u7ed3\u6784\u3002\u53ef\u4ee5\u7528\u6765\u91cd\u547d\u540d\u3001\u589e\u52a0\u6216\u5220\u9664\u57df\uff0c\u4e5f\u53ef\u4ee5\u7528\u4e8e\u521b\u5efa\u8ba1\u7b97\u7ed3\u679c\u4ee5\u53ca\u5d4c\u5957\u6587\u6863\u3002<\/li>\n
  • $match\uff1a\u7528\u4e8e\u8fc7\u6ee4\u6570\u636e\uff0c\u53ea\u8f93\u51fa\u7b26\u5408\u6761\u4ef6\u7684\u6587\u6863\u3002$match\u4f7f\u7528MongoDB\u7684\u6807\u51c6\u67e5\u8be2\u64cd\u4f5c\u3002<\/li>\n
  • $limit\uff1a\u7528\u6765\u9650\u5236MongoDB\u805a\u5408\u7ba1\u9053\u8fd4\u56de\u7684\u6587\u6863\u6570\u3002<\/li>\n
  • $skip\uff1a\u5728\u805a\u5408\u7ba1\u9053\u4e2d\u8df3\u8fc7\u6307\u5b9a\u6570\u91cf\u7684\u6587\u6863\uff0c\u5e76\u8fd4\u56de\u4f59\u4e0b\u7684\u6587\u6863\u3002<\/li>\n
  • $unwind\uff1a\u5c06\u6587\u6863\u4e2d\u7684\u67d0\u4e00\u4e2a\u6570\u7ec4\u7c7b\u578b\u5b57\u6bb5\u62c6\u5206\u6210\u591a\u6761\uff0c\u6bcf\u6761\u5305\u542b\u6570\u7ec4\u4e2d\u7684\u4e00\u4e2a\u503c\u3002<\/li>\n
  • $group\uff1a\u5c06\u96c6\u5408\u4e2d\u7684\u6587\u6863\u5206\u7ec4\uff0c\u53ef\u7528\u4e8e\u7edf\u8ba1\u7ed3\u679c\u3002<\/li>\n
  • $sort\uff1a\u5c06\u8f93\u5165\u6587\u6863\u6392\u5e8f\u540e\u8f93\u51fa\u3002<\/li>\n
  • $geoNear\uff1a\u8f93\u51fa\u63a5\u8fd1\u67d0\u4e00\u5730\u7406\u4f4d\u7f6e\u7684\u6709\u5e8f\u6587\u6863\u3002<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"
    redact redaction \u4fee\u8ba2\/\u6821\u9a8c\uff0c\u610f\u601d\u662f\u5bf9\u6587\u6863\u5185\u5bb9\u8fdb\u884c\u8fc7\u6ee4\uff0c\u9009\u62e9\u4e00\u4e9b\u8fc7\u6ee4\u6216\u4fdd\u7559\u7684\u4fe1\u606f\u3002 $$DES […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[15],"tags":[414],"class_list":["post-720","post","type-post","status-publish","format-standard","hentry","category-15","tag-node"],"_links":{"self":[{"href":"https:\/\/wyxxt.org.cn\/index.php?rest_route=\/wp\/v2\/posts\/720","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wyxxt.org.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wyxxt.org.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wyxxt.org.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/wyxxt.org.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=720"}],"version-history":[{"count":1,"href":"https:\/\/wyxxt.org.cn\/index.php?rest_route=\/wp\/v2\/posts\/720\/revisions"}],"predecessor-version":[{"id":721,"href":"https:\/\/wyxxt.org.cn\/index.php?rest_route=\/wp\/v2\/posts\/720\/revisions\/721"}],"wp:attachment":[{"href":"https:\/\/wyxxt.org.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=720"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wyxxt.org.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=720"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wyxxt.org.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=720"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}