在mongodb中，存在如下數(shù)據(jù)

{ "_id" : ObjectId("59af55078a8fc5e51ff425de"), "title" : "title1", "col" : "col 1", "reader" : [ { "readername" : "jim", "isread" : true }, { "readername" : "ka te" }, { "readername" : "lilei" } ], "begindate" : "Wed Sep 06 2017 09:53:11 GMT +0800 (中國標準時間)" } { "_id" : ObjectId("59af552e8a8fc5e51ff425df"), "title" : "title2", "col" : "col 1", "reader" : [ { "readername" : "jim" }, { "readername" : "kate" }, { "readern ame" : "lilei" }, { "readername" : "lily" } ], "begindate" : "Wed Sep 06 2017 09 :53:50 GMT+0800 (中國標準時間)" } { "_id" : ObjectId("59af55458a8fc5e51ff425e0"), "title" : "title3", "col" : "col 1", "reader" : [ { "readername" : "jim" }, { "readername" : "kate" } ], "beginda te" : "Wed Sep 06 2017 09:54:13 GMT+0800 (中國標準時間)" }

需求1：查詢欄目是col1，且讀者是lily的記錄：

> db.articles.find({col:'col1','reader.readername':'lily'}) //查詢結果 { "_id" : ObjectId("59af552e8a8fc5e51ff425df"), "title" : "title2", "col" : "col 1", "reader" : [ { "readername" : "jim" }, { "readername" : "kate" }, { "readern ame" : "lilei" }, { "readername" : "lily" } ], "begindate" : "Wed Sep 06 2017 09 :53:50 GMT+0800 (中國標準時間)" }

即數(shù)組中的對象用形如“數(shù)組名.字段”組成

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需求2：把標題為title2，且讀者為lily的已讀記錄‘isread’設置為true

> db.articles.update({title:'title2','reader.readername':'lily'},{$set:{'reader. $.isread':true}}) WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })

{ "_id" : ObjectId("59af552e8a8fc5e51ff425df"), "title" : "title2", "col" : "col 1", "reader" : [ { "readername" : "jim" }, { "readername" : "kate" }, { "readern ame" : "lilei" }, { "readername" : "lily", "isread" : true } ], "begindate" : "W ed Sep 06 2017 09:53:50 GMT+0800 (中國標準時間)" }

核心是$，可以理解為數(shù)組定位器

需求3：刪除名為title2下的reader名字為lilei的讀者對象：

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//未刪除前數(shù)據(jù) { "_id" : ObjectId("59af552e8a8fc5e51ff425df"), "title" : "title2", "col" : "col 1", "reader" : [ { "readername" : "jim" }, { "readername" : "kate" }, { "readern ame" : "lilei" }, { "readername" : "lily", "isread" : true } ], "begindate" : "W ed Sep 06 2017 09:53:50 GMT+0800 (中國標準時間)" }//執(zhí)行命令 > db.articles.update({title:'title2','reader.readername':'lilei'},{$pull:{'reader':{readername:'lilei'}}})//執(zhí)行命令后查詢的結果 > db.articles.find({title:'title2'}); { "_id" : ObjectId("59af552e8a8fc5e51ff425df"), "title" : "title2", "col" : "col 1", "reader" : [ { "readername" : "jim" }, { "readername" : "kate" }, { "readern ame" : "lily", "isread" : true } ], "begindate" : "Wed Sep 06 2017 09:53:50 GMT+ 0800 (中國標準時間)" }

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核心是用$pull命令查找數(shù)組名稱，然后通過屬性值刪除數(shù)組內(nèi)的對象記錄

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轉(zhuǎn)載于:https://www.cnblogs.com/qkabcd/p/7483357.html

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