MongoDB
2015-08-12 11:47
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http://www.cnblogs.com/libingql/archive/2011/06/09/2076440.html
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> show dbs admin (empty) local 0.031GB nutch_eclipse 0.031GB test (empty) > use nutch_eclipse switched to db nutch_eclipse > show collections system.indexes webpage > db.webpage.count() 467 >
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> db.webpage.findOne() { "_id" : "cn.edu.hist.crjyxy:http/info/1012/1085.htm", "status" : 1, "fetchTime" : NumberLong("1439345028815"), "fetchInterval" : 2592000, "retriesSinceFetch" : 0, "score" : 0, "inlinks" : { "http://crjyxy·hist·edu·cn/zzjd·htm" : "关于2009年度中等职业学校专业骨干教师国家级培训的通知" }, "markers" : { "dist" : "2" }, "metadata" : { "_csh_" : BinData(0,"AAAAAA==") } }
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> db.webpage.distinct("_id") [ "cn.edu.hist.chengj:http/pxjd/index.asp", "cn.edu.hist.crjyxy:http/200936122845946.rar", "cn.edu.hist.crjyxy:http/index.htm", "cn.edu.hist.crjyxy:http/info/1012/1075.htm", "cn.edu.hist.crjyxy:http/info/1012/1079.htm", "cn.edu.hist.yyylxy:http/", "cn.edu.hist.zdxx:http/", "cn.edu.hist.zgwyhdx:http/", "cn.edu.hist.zsxx:http/", "cn.edu.hist.zyyhjxy:http/", "cn.edu.hist.zzb:http/" ] >
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> db.webpage.find().count() 467
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> db.webpage.find().limit(5) { "_id" : "cn.edu.hist.crjyxy:http/info/1012/1085.htm", "status" : 1, "fetchTime" : NumberLong("1439345028815"), "fetchInterval" : 2592000, "retriesSinceFetch" : 0, "score" : 0, "inlinks" : { "http://crjyxy·hist·edu·cn/zzjd·htm" : "关于2009年度中等职业学校专业骨干教师国家级培训的通知" }, "markers" : { "dist" : "2" }, "metadata" : { "_csh_" : BinData(0,"AAAAAA==") } } { "_id" : "cn.edu.hist.jwc:http/jwxw.htm", "status" : 1, "fetchTime" : NumberLong("1439345028926"), "fetchInterval" : 2592000, "retriesSinceFetch" : 0, "score" : 0, "inlinks" : { "http://jwc·hist·edu·cn/" : "" }, "markers" : { "dist" : "2" }, "metadata" : { "_csh_" : BinData(0,"AAAAAA==") } } { "_id" : "cn.edu.hist.chengj:http/pxjd/index.asp", "status" : 1, "fetchTime" : NumberLong("1439345028769"), "fetchInterval" : 2592000, "retriesSinceFetch" : 0, "score" : 0, "inlinks" : { "http://crjyxy·hist·edu·cn/info/1012/1078·htm" : "http://chengj.hist.edu.cn/pxjd/index.asp" }, "markers" : { "dist" : "3" }, "metadata" : { "_csh_" : BinData(0,"AAAAAA==") } } { "_id" : "cn.edu.hist.crjyxy:http/200936122845946.rar", "status" : 1, "fetchTime" : NumberLong("1439345028786"), "fetchInterval" : 2592000, "retriesSinceFetch" : 0, "score" : 0, "inlinks" : { "http://crjyxy·hist·edu·cn/info/1012/1084·htm" : "教育部文件.rar" }, "markers" : { "dist" : "3" }, "metadata" : { "_csh_" : BinData(0,"AAAAAA==") } } { "_id" : "cn.edu.hist.www:http/info/1099/9733.htm", "status" : 1, "fetchTime" : NumberLong("1439345029107"), "fetchInterval" : 2592000, "retriesSinceFetch" : 0, "score" : 0, "inlinks" : { "http://www·hist·edu·cn/index/sy/tzgg/kjc·htm" : "关于我校组织参加“第四届中国创新创业大赛河南赛区暨河南省科技创业雏鹰大赛”的通知" }, "markers" : { "dist" : "2" }, "metadata" : { "_csh_" : BinData(0,"AAAAAA==") } }
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> db.webpage.find().skip(466) { "_id" : "cn.edu.hist.zzb:http/", "status" : 1, "fetchTime" : NumberLong("1439345029199"), "fetchInterval" : 2592000, "retriesSinceFetch" : 0, "score" : 0, "inlinks" : { "http://www·hist·edu·cn/jgsz/dqjg·htm" : "党委组织部" }, "markers" : { "dist" : "2" }, "metadata" : { "_csh_" : BinData(0,"AAAAAA==") } }
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> db.webpage.remove({}) WriteResult({ "nRemoved" : 467 }) > db.webpage.find().count() 0
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