大部分內(nèi)容根據(jù)MongoDB官方手冊整理：http://docs.mongodb.org/manual/contents/

查看數(shù)據(jù)庫

[root@slayer ~]# mongo MongoDB shell version: 2.2.3 connecting to: test > show dbs local (empty) test 0.0625GB >

使用use切換數(shù)據(jù)庫，use一個新名字可以使用新數(shù)據(jù)庫，MongoDB會等到插入數(shù)據(jù)才會建立

> use mydb switched to db mydb > show dbs local (empty) test 0.0625GB > db.mydb.insert({name:"slayer"}) > show dbs local (empty) mydb 0.0625GB test 0.0625GB >

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find看內(nèi)容

> db.mydb.find() { "_id" : ObjectId("50c950ab96c0253cce4a8c87"), "name" : "slayer" } >

換個方式插入。。

> a = {1 : "x"} { "1" : "x" } > b = {2 : "y"} { "2" : "y" } > db.mydb.insert(a, b) > db.mydb.find() { "_id" : ObjectId("50c950ab96c0253cce4a8c87"), "name" : "slayer" } { "_id" : ObjectId("50c951ba96c0253cce4a8c88"), "1" : "x" } > db.mydb.insert(b) > db.mydb.find() { "_id" : ObjectId("50c950ab96c0253cce4a8c87"), "name" : "slayer" } { "_id" : ObjectId("50c951ba96c0253cce4a8c88"), "1" : "x" } { "_id" : ObjectId("50c951d096c0253cce4a8c89"), "2" : "y" }

可以看到insert不支持多個參數(shù)

用循環(huán)插入

> for (i=0; i<7; ++i) db.mydb.insert({value: i}) > db.mydb.find() { "_id" : ObjectId("50c950ab96c0253cce4a8c87"), "name" : "slayer" } { "_id" : ObjectId("50c951ba96c0253cce4a8c88"), "1" : "x" } { "_id" : ObjectId("50c951d096c0253cce4a8c89"), "2" : "y" } { "_id" : ObjectId("50c9661596c0253cce4a8c8a"), "value" : 0 } { "_id" : ObjectId("50c9661596c0253cce4a8c8b"), "value" : 1 } { "_id" : ObjectId("50c9661596c0253cce4a8c8c"), "value" : 2 } { "_id" : ObjectId("50c9661596c0253cce4a8c8d"), "value" : 3 } { "_id" : ObjectId("50c9661596c0253cce4a8c8e"), "value" : 4 } { "_id" : ObjectId("50c9661596c0253cce4a8c8f"), "value" : 5 } { "_id" : ObjectId("50c9661596c0253cce4a8c90"), "value" : 6 } >

繼續(xù)插入

> db.mydb.xx.insert({1:3}) > db.mydb.xx.find() { "_id" : ObjectId("50c966b596c0253cce4a8c91"), "1" : 3 }

查看當(dāng)前數(shù)據(jù)庫 db 刪除數(shù)據(jù)庫 db.dropDatabase()

> db mydb > show dbs local (empty) mydb 0.0625GB test 0.0625GB > db.dropDatabase() { "dropped" : "mydb", "ok" : 1 } > show dbs local (empty) test 0.0625GB > db

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使用游標(biāo)和循環(huán)來打印內(nèi)容

> var c = db.mydb.find() > while (c.hasNext()) printjson(c.next()) { "_id" : ObjectId("50c96b7196c0253cce4a8c92"), "value" : 0 } { "_id" : ObjectId("50c96b7196c0253cce4a8c93"), "value" : 1 } { "_id" : ObjectId("50c96b7196c0253cce4a8c94"), "value" : 2 } { "_id" : ObjectId("50c96b7196c0253cce4a8c95"), "value" : 3 } { "_id" : ObjectId("50c96b7196c0253cce4a8c96"), "value" : 4 } { "_id" : ObjectId("50c96b7196c0253cce4a8c97"), "value" : 5 } { "_id" : ObjectId("50c96b7196c0253cce4a8c98"), "value" : 6 } >

三個方法的官方說明：The hasNext() function returns true if the cursor has documents. The next() method returns the next document. The printjson() method renders the document in a JSON-like format.

hasNext() 返回游標(biāo)是否指向文件，next 返回下一個文件。printjson 把文件用用類json格式打印出來。

使用游標(biāo)的下標(biāo)

> var c = db.mydb.find() > printjson(c[0]) { "_id" : ObjectId("50c96b7196c0253cce4a8c92"), "value" : 0 } > printjson(c[4]) { "_id" : ObjectId("50c96b7196c0253cce4a8c96"), "value" : 4 }

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打印復(fù)雜點的json數(shù)據(jù)

> db.mydb.xx.insert({a : 1, b: {A : "x", B : {alpha : 0}}}) > var c = db.mydb.xx.find() > printjson(c.next()) {"_id" : ObjectId("50c96eee96c0253cce4a8c99"),"a" : 1,"b" : {"A" : "x","B" : {"alpha" : 0}} } >

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查找元素

> db.mydb.find({value:0}) { "_id" : ObjectId("50c96b7196c0253cce4a8c92"), "value" : 0 } > db.mydb.insert({value:0, xx:"a"}) > db.mydb.find({value:0}) { "_id" : ObjectId("50c96b7196c0253cce4a8c92"), "value" : 0 } { "_id" : ObjectId("50c9707396c0253cce4a8c9a"), "value" : 0, "xx" : "a" } > db.mydb.find({value:0}).limit(1) { "_id" : ObjectId("50c96b7196c0253cce4a8c92"), "value" : 0 } >

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最后看看各種help..

> helpdb.help() help on db methodsdb.mycoll.help() help on collection methodssh.help() sharding helpersrs.help() replica set helpershelp admin administrative helphelp connect connecting to a db helphelp keys key shortcutshelp misc misc things to knowhelp mr mapreduceshow dbs show database namesshow collections show collections in current databaseshow users show users in current databaseshow profile show most recent system.profile entries with time >= 1msshow logs show the accessible logger namesshow log [name] prints out the last segment of log in memory, 'global' is defaultuse <db_name> set current databasedb.foo.find() list objects in collection foodb.foo.find( { a : 1 } ) list objects in foo where a == 1it result of the last line evaluated; use to further iterateDBQuery.shellBatchSize = x set default number of items to display on shellexit quit the mongo shell >

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MongoDB學(xué)習(xí)筆記【1】-- 安裝啟動

MongoDB學(xué)習(xí)筆記【2】--?試用

MongoDB學(xué)習(xí)筆記【3】--?MongoDB C驅(qū)動使用

MongoDB學(xué)習(xí)筆記【4】-- MongoDB Java驅(qū)動使用

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轉(zhuǎn)載于:https://www.cnblogs.com/Leo-Forest/archive/2013/03/01/2938364.html

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