Mongo 2.2.0\u7248\u672c\u4ecb\u7ecd\u4e86mongo\u7684\u805a\u5408\u6846\u67b6\uff0c\u8be5\u6846\u67b6\u53ef\u4ee5\u5f88\u65b9\u4fbf\u7684\u5b9e\u73b0\u4e00\u4e9b\u805a\u5408\u64cd\u4f5c\uff0c\u4f8b\u5982\u8ba1\u6570\u3001\u53d6\u548c\u3001\u8ba1\u7b97\u5e73\u5747\u503c\u3002\u6846\u67b6\u4f7f\u7528C++\u7f16\u5199\uff0c\u652f\u6301\u591a\u7ebf\u7a0b\uff0c\u53ef\u4ee5\u5f88\u597d\u7684\u8de8\u5e73\u53f0\u3002\u4e0b\u9762\u662f\u4e00\u4e2amongod java driver\u7684\u4e00\u4e2a\u7b80\u5355\u7684\u4f8b\u5b50\u3002<\/p>\n
\n\/*\n* \u6ce8\u610f\u805a\u5408\u9700\u8981mongo\u7248\u672c\u57282.2\u5f80\u4e0a\uff0c\u5982\u679cmongo\u7248\u672c\u6bd4\u8f83\u4f4e\uff0c\u4f1a\u62a5MongoDB Java driver : no such cmd: aggregate\u7684\u9519\u8bef\u3002\n* \u4e0b\u9762\u9644\u4e0amongo\u5b98\u65b9\u624b\u518c\uff1ahttp:\/\/docs.mongodb.org\/manual\/contents\/\n* \u8fd9\u4e2a\u5730\u5740\u5217\u51fa\u4e86mongo\u652f\u6301\u7684\u6240\u6709\u67e5\u8be2\u4e0e\u805a\u5408\u547d\u4ee4\uff1ahttp:\/\/docs.mongodb.org\/manual\/reference\/operator\/\n* \u8fd9\u4e2a\u5730\u5740\u5217\u51fa\u4e86shell\u652f\u6301\u7684\u6240\u6709\u51fd\u6570\uff1ahttp:\/\/docs.mongodb.org\/manual\/reference\/method\/\n*\/\npackage com.yeetrack.mongodb.test;\nimport java.net.UnknownHostException;\n\nimport com.mongodb.AggregationOutput;\nimport com.mongodb.BasicDBObject;\nimport com.mongodb.DB;\nimport com.mongodb.DBCollection;\nimport com.mongodb.DBObject;\nimport com.mongodb.MongoClient;\n\npublic class MyMongdbAggregation\n{\n\n\/**\n* Java Driver and Aggregation Framework\n* @author youthflies\n* @throws UnknownHostException\n* \u6ce8\u610f\u805a\u5408\u9700\u8981mongo\u7248\u672c\u57282.2\u5f80\u4e0a\uff0c\u5982\u679cmongo\u7248\u672c\u6bd4\u8f83\u4f4e\uff0c\u4f1a\u62a5MongoDB Java driver : no such cmd: aggregate\u7684\u9519\u8bef\u3002\n* \u4e0b\u9762\u9644\u4e0amongo\u5b98\u65b9\u624b\u518c\uff1ahttp:\/\/docs.mongodb.org\/manual\/contents\/\n* \u8fd9\u4e2a\u5730\u5740\u5217\u51fa\u4e86mongo\u652f\u6301\u7684\u6240\u6709\u67e5\u8be2\u4e0e\u805a\u5408\u547d\u4ee4\uff1ahttp:\/\/docs.mongodb.org\/manual\/reference\/operator\/\n* \u8fd9\u4e2a\u5730\u5740\u5217\u51fa\u4e86shell\u652f\u6301\u7684\u6240\u6709\u51fd\u6570\uff1ahttp:\/\/docs.mongodb.org\/manual\/reference\/method\/\n*\/\npublic static void main(String[] args) throws UnknownHostException\n{\n\/\/ TODO Auto-generated method stub\nMongoClient mongoClient = new MongoClient(\"192.22.219.163\", 27017);\nDB db = mongoClient.getDB(\"mydb\");\nDBCollection collection = db.getCollection(\"expenses\");\n\n\/\/ \/\/\u521b\u5efa\u6570\u636e\n\/\/ String department = \"Sales\";\n\/\/ for(int i=1;i<=15;i++)\n\/\/ {\n\/\/ if(i==6)\n\/\/ department = \"egineering\";\n\/\/ if(i==11)\n\/\/ department = \"Human\";\n\/\/ BasicDBObject basicDBObject = new BasicDBObject(\"employee\", i).\n\/\/ append(\"department\", department).\n\/\/ append(\"amount\", i*2+1).\n\/\/ append(\"type\", \"airfare\");\n\/\/ collection.insert(basicDBObject);\n\/\/\n\/\/ }\n\/\/\u9996\u5148\u5229$match\u7b5b\u9009\u51fatype\u4e3aairfate\u7684\u884c\nDBObject match = new BasicDBObject(\"$match\", new BasicDBObject(\"type\", \"airfare\") );\n\n\/\/ \u5229\u7528$project\u62fc\u88c5\u9700\u8981\u7684\u6570\u636e\uff0c\u5305\u542bdepartment\u5217\u3001amount\u5217\u548cid\u5217\nDBObject fields = new BasicDBObject(\"department\", 1);\nfields.put(\"amount\", 1);\nfields.put(\"_id\", 0);\nDBObject project = new BasicDBObject(\"$project\", fields );\n\n\/\/ \u5bf9\u4e0a\u9762\u7684project\u5229\u7528group\u5206\u7ec4\nDBObject groupFields = new BasicDBObject( \"_id\", \"$department\");\ngroupFields.put(\"average\", new BasicDBObject( \"$avg\", \"$amount\"));\nDBObject group = new BasicDBObject(\"$group\", groupFields);\n\n\/\/ run aggregation\nAggregationOutput output = collection.aggregate( match, project, group );\nSystem.out.println(output);\n\nmongoClient.close();\n\n}\n\n}<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"Mongo 2.2.0\u7248\u672c\u4ecb\u7ecd\u4e86mongo\u7684\u805a\u5408\u6846\u67b6\uff0c\u8be5\u6846\u67b6\u53ef\u4ee5\u5f88\u65b9\u4fbf\u7684\u5b9e\u73b0\u4e00\u4e9b\u805a\u5408\u64cd\u4f5c\uff0c\u4f8b\u5982\u8ba1\u6570\u3001\u53d6\u548c\u3001\u8ba1\u7b97\u5e73\u5747\u503c\u3002\u6846\u67b6\u4f7f\u7528C++\u7f16\u5199\uff0c\u652f\u6301\u591a\u7ebf\u7a0b\uff0c\u53ef\u4ee5\u5f88\u597d\u7684\u8de8\u5e73\u53f0\u3002\u4e0b\u9762\u662f\u4e00\u4e2amongod java...<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"pgc_sgb_lightbox_settings":"","footnotes":""},"categories":[33],"tags":[8,7,5],"class_list":["post-649","post","type-post","status-publish","format-standard","hentry","category-coding","tag-java","tag-7","tag-5"],"views":6075,"_links":{"self":[{"href":"https:\/\/www.yeetrack.com\/index.php?rest_route=\/wp\/v2\/posts\/649","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.yeetrack.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.yeetrack.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.yeetrack.com\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.yeetrack.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=649"}],"version-history":[{"count":2,"href":"https:\/\/www.yeetrack.com\/index.php?rest_route=\/wp\/v2\/posts\/649\/revisions"}],"predecessor-version":[{"id":724,"href":"https:\/\/www.yeetrack.com\/index.php?rest_route=\/wp\/v2\/posts\/649\/revisions\/724"}],"wp:attachment":[{"href":"https:\/\/www.yeetrack.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=649"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.yeetrack.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=649"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.yeetrack.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=649"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}