2.非关系型数据库（Nosql）之mongodb：mongodb显示所有数据库，使用数据库，集合创建（显示和隐式创建），集合查询，初步数据的增删改查,分页
1代開一個cmd窗口，當作mongodb客戶端，執行以下命令：
mongo localhost:27017
2查看所有的數據庫：
| > show dbs; admin?(empty) local?0.078GB
|
3 db命令，查看當前窗口在那個數據庫下面（test數據庫沒有任何數據，在內存里面）：
4創建集合
A?顯示創建
| db.createCollection(“collectionName”); |
| > db.createCollection("c1") { "ok" : 1 } >?
|
B?隱式創建
| > db.c2.insert({name:"zhangsan",age:31}) WriteResult({ "nInserted" : 1 }); 顯示集合 show collections;
|
5 CRUD
| A添加 |
| db.collectionName.insert({}) |
| > db.c2.insert({name:"zhangsan",age:31}) WriteResult({ "nInserted" : 1 }) > show collections; c1 c2 system.indexes > var i = 1+2; > i 3 > for(var i = 1 ; i <= 10000;i++){ ... db.c1.insert({name:'toto',age:24}) ... } WriteResult({ "nInserted" : 1 }) >? 清屏命令：cls |
| B刪除 db.collectionName.remove(); |
| > db.c4.insert({name:"zhangsan",age:20}); WriteResult({ "nInserted" : 1 }) > db.c4.insert({name:"lisi",age:24}); WriteResult({ "nInserted" : 1 })
db.c4.find();
> db.c4.remove({name:"zhangsan"}); WriteResult({ "nRemoved" : 1 }) > db.c4.find(); { "_id" : ObjectId("543e0b6ae2c90313035e7ce3"), "name" : "lisi", "age" : 24 } >?
|
| C查詢 A db.collectionName.find({條件}); eg：db.c3.find();
|
| 再如： > db.c4.find({name:"lisi"}); { "_id" : ObjectId("543e0b6ae2c90313035e7ce3"), "name" : "lisi", "age" : 24 } >?
|
| B查找集合中的第一條數據 db.collectionName.findOne(); eg： > db.c4.find(); { "_id" : ObjectId("543e0b6ae2c90313035e7ce3"), "name" : "lisi", "age" : 24 } { "_id" : ObjectId("543e0d96e2c90313035e7ce4"), "name" : "wangwu", "age" : 20 } { "_id" : ObjectId("543e0da0e2c90313035e7ce5"), "name" : "zhaoliu", "age" : 25 } { "_id" : ObjectId("543e0da8e2c90313035e7ce6"), "name" : "tianqi", "age" : 25 } > db.c4.findOne(); { ???????"_id" : ObjectId("543e0b6ae2c90313035e7ce3"), ???????"name" : "lisi", ???????"age" : 24 } >?
注意：_id每個表都有，是mongodb自動維護的。 |
| C查詢集合中的文檔，返回某些特定的鍵值 除了查詢表達式以外，Mongodb還支持一些額外的參數選項，例如，我們可能僅僅只想返回某些特定的字段值： > db.c4.find({name:"wangwu"},{name:1}); { "_id" : ObjectId("543e0d96e2c90313035e7ce4"), "name" : "wangwu" } >?
|
| D查詢顯示問題 |
| > for(var i = 1; i<=30;i++){ ... db.c4.insert({name:"tuzuoquan",age:i}); ... } WriteResult({ "nInserted" : 1 }) >? 查詢： > db.c4.find(); { "_id" : ObjectId("543e0b6ae2c90313035e7ce3"), "name" : "lisi", "age" : 24 } { "_id" : ObjectId("543e0d96e2c90313035e7ce4"), "name" : "wangwu", "age" : 20 } { "_id" : ObjectId("543e0da0e2c90313035e7ce5"), "name" : "zhaoliu", "age" : 25 } { "_id" : ObjectId("543e0da8e2c90313035e7ce6"), "name" : "tianqi", "age" : 25 } { "_id" : ObjectId("543e104fe2c90313035e7ce7"), "name" : "tuzuoquan", "age" : 1 } { "_id" : ObjectId("543e104fe2c90313035e7ce8"), "name" : "tuzuoquan", "age" : 2 } { "_id" : ObjectId("543e104fe2c90313035e7ce9"), "name" : "tuzuoquan", "age" : 3 } { "_id" : ObjectId("543e104fe2c90313035e7cea"), "name" : "tuzuoquan", "age" : 4 } { "_id" : ObjectId("543e104fe2c90313035e7ceb"), "name" : "tuzuoquan", "age" : 5 } { "_id" : ObjectId("543e104fe2c90313035e7cec"), "name" : "tuzuoquan", "age" : 6 } { "_id" : ObjectId("543e104fe2c90313035e7ced"), "name" : "tuzuoquan", "age" : 7 } { "_id" : ObjectId("543e104fe2c90313035e7cee"), "name" : "tuzuoquan", "age" : 8 } { "_id" : ObjectId("543e104fe2c90313035e7cef"), "name" : "tuzuoquan", "age" : 9 } { "_id" : ObjectId("543e104fe2c90313035e7cf0"), "name" : "tuzuoquan", "age" : 10 } { "_id" : ObjectId("543e104fe2c90313035e7cf1"), "name" : "tuzuoquan", "age" : 11 } { "_id" : ObjectId("543e104fe2c90313035e7cf2"), "name" : "tuzuoquan", "age" : 12 } { "_id" : ObjectId("543e104fe2c90313035e7cf3"), "name" : "tuzuoquan", "age" : 13 } { "_id" : ObjectId("543e104fe2c90313035e7cf4"), "name" : "tuzuoquan", "age" : 14 } { "_id" : ObjectId("543e104fe2c90313035e7cf5"), "name" : "tuzuoquan", "age" : 15 } { "_id" : ObjectId("543e104fe2c90313035e7cf6"), "name" : "tuzuoquan", "age" : 16 } Type "it" for more > it { "_id" : ObjectId("543e104fe2c90313035e7cf7"), "name" : "tuzuoquan", "age" : 17 } { "_id" : ObjectId("543e104fe2c90313035e7cf8"), "name" : "tuzuoquan", "age" : 18 } { "_id" : ObjectId("543e104fe2c90313035e7cf9"), "name" : "tuzuoquan", "age" : 19 } { "_id" : ObjectId("543e104fe2c90313035e7cfa"), "name" : "tuzuoquan", "age" : 20 } { "_id" : ObjectId("543e104fe2c90313035e7cfb"), "name" : "tuzuoquan", "age" : 21 } { "_id" : ObjectId("543e104fe2c90313035e7cfc"), "name" : "tuzuoquan", "age" : 22 } { "_id" : ObjectId("543e104fe2c90313035e7cfd"), "name" : "tuzuoquan", "age" : 23 } { "_id" : ObjectId("543e104fe2c90313035e7cfe"), "name" : "tuzuoquan", "age" : 24 } { "_id" : ObjectId("543e104fe2c90313035e7cff"), "name" : "tuzuoquan", "age" : 25 } { "_id" : ObjectId("543e104fe2c90313035e7d00"), "name" : "tuzuoquan", "age" : 26 } { "_id" : ObjectId("543e104fe2c90313035e7d01"), "name" : "tuzuoquan", "age" : 27 } { "_id" : ObjectId("543e104fe2c90313035e7d02"), "name" : "tuzuoquan", "age" : 28 } { "_id" : ObjectId("543e104fe2c90313035e7d03"), "name" : "tuzuoquan", "age" : 29 } { "_id" : ObjectId("543e104fe2c90313035e7d04"), "name" : "tuzuoquan", "age" : 30 } > db.c4.count(); 34 >總結： Mongodb客戶端默認一次顯示20條記錄 ? Eg:顯示age大于20個數據： > db.c4.find({age:{$gt:20}}); { "_id" : ObjectId("543e0b6ae2c90313035e7ce3"), "name" : "lisi", "age" : 24 } { "_id" : ObjectId("543e0da0e2c90313035e7ce5"), "name" : "zhaoliu", "age" : 25 } { "_id" : ObjectId("543e0da8e2c90313035e7ce6"), "name" : "tianqi", "age" : 25 } { "_id" : ObjectId("543e104fe2c90313035e7cfb"), "name" : "tuzuoquan", "age" : 21 } { "_id" : ObjectId("543e104fe2c90313035e7cfc"), "name" : "tuzuoquan", "age" : 22 } { "_id" : ObjectId("543e104fe2c90313035e7cfd"), "name" : "tuzuoquan", "age" : 23 } { "_id" : ObjectId("543e104fe2c90313035e7cfe"), "name" : "tuzuoquan", "age" : 24 } { "_id" : ObjectId("543e104fe2c90313035e7cff"), "name" : "tuzuoquan", "age" : 25 } { "_id" : ObjectId("543e104fe2c90313035e7d00"), "name" : "tuzuoquan", "age" : 26 } { "_id" : ObjectId("543e104fe2c90313035e7d01"), "name" : "tuzuoquan", "age" : 27 } { "_id" : ObjectId("543e104fe2c90313035e7d02"), "name" : "tuzuoquan", "age" : 28 } { "_id" : ObjectId("543e104fe2c90313035e7d03"), "name" : "tuzuoquan", "age" : 29 } { "_id" : ObjectId("543e104fe2c90313035e7d04"), "name" : "tuzuoquan", "age" : 30 }
? Eg:顯示age >= 25的數據： db.c4.find({age:{$gte:25}}); > db.c4.find({age:{$gte:25}}); { "_id" : ObjectId("543e0da0e2c90313035e7ce5"), "name" : "zhaoliu", "age" : 25 } { "_id" : ObjectId("543e0da8e2c90313035e7ce6"), "name" : "tianqi", "age" : 25 } { "_id" : ObjectId("543e104fe2c90313035e7cff"), "name" : "tuzuoquan", "age" : 25 } { "_id" : ObjectId("543e104fe2c90313035e7d00"), "name" : "tuzuoquan", "age" : 26 } { "_id" : ObjectId("543e104fe2c90313035e7d01"), "name" : "tuzuoquan", "age" : 27 } { "_id" : ObjectId("543e104fe2c90313035e7d02"), "name" : "tuzuoquan", "age" : 28 } { "_id" : ObjectId("543e104fe2c90313035e7d03"), "name" : "tuzuoquan", "age" : 29 } { "_id" : ObjectId("543e104fe2c90313035e7d04"), "name" : "tuzuoquan", "age" : 30 } >?
? Eg:顯示age <= 15的數據： > db.c4.find({age:{$lte:15}}); { "_id" : ObjectId("543e104fe2c90313035e7ce7"), "name" : "tuzuoquan", "age" : 1 } { "_id" : ObjectId("543e104fe2c90313035e7ce8"), "name" : "tuzuoquan", "age" : 2 } { "_id" : ObjectId("543e104fe2c90313035e7ce9"), "name" : "tuzuoquan", "age" : 3 } { "_id" : ObjectId("543e104fe2c90313035e7cea"), "name" : "tuzuoquan", "age" : 4 } { "_id" : ObjectId("543e104fe2c90313035e7ceb"), "name" : "tuzuoquan", "age" : 5 } { "_id" : ObjectId("543e104fe2c90313035e7cec"), "name" : "tuzuoquan", "age" : 6 } { "_id" : ObjectId("543e104fe2c90313035e7ced"), "name" : "tuzuoquan", "age" : 7 } { "_id" : ObjectId("543e104fe2c90313035e7cee"), "name" : "tuzuoquan", "age" : 8 } { "_id" : ObjectId("543e104fe2c90313035e7cef"), "name" : "tuzuoquan", "age" : 9 } { "_id" : ObjectId("543e104fe2c90313035e7cf0"), "name" : "tuzuoquan", "age" : 10 } { "_id" : ObjectId("543e104fe2c90313035e7cf1"), "name" : "tuzuoquan", "age" : 11 } { "_id" : ObjectId("543e104fe2c90313035e7cf2"), "name" : "tuzuoquan", "age" : 12 } { "_id" : ObjectId("543e104fe2c90313035e7cf3"), "name" : "tuzuoquan", "age" : 13 } { "_id" : ObjectId("543e104fe2c90313035e7cf4"), "name" : "tuzuoquan", "age" : 14 } { "_id" : ObjectId("543e104fe2c90313035e7cf5"), "name" : "tuzuoquan", "age" : 15 } >?
? Eg:顯示age不等于 2的數據： > db.c4.find({age:{$ne:2}}); { "_id" : ObjectId("543e0b6ae2c90313035e7ce3"), "name" : "lisi", "age" : 24 } { "_id" : ObjectId("543e0d96e2c90313035e7ce4"), "name" : "wangwu", "age" : 20 } { "_id" : ObjectId("543e0da0e2c90313035e7ce5"), "name" : "zhaoliu", "age" : 25 } { "_id" : ObjectId("543e0da8e2c90313035e7ce6"), "name" : "tianqi", "age" : 25 } { "_id" : ObjectId("543e104fe2c90313035e7ce7"), "name" : "tuzuoquan", "age" : 1 } { "_id" : ObjectId("543e104fe2c90313035e7ce9"), "name" : "tuzuoquan", "age" : 3 } { "_id" : ObjectId("543e104fe2c90313035e7cea"), "name" : "tuzuoquan", "age" : 4 } { "_id" : ObjectId("543e104fe2c90313035e7ceb"), "name" : "tuzuoquan", "age" : 5 } { "_id" : ObjectId("543e104fe2c90313035e7cec"), "name" : "tuzuoquan", "age" : 6 } { "_id" : ObjectId("543e104fe2c90313035e7ced"), "name" : "tuzuoquan", "age" : 7 } { "_id" : ObjectId("543e104fe2c90313035e7cee"), "name" : "tuzuoquan", "age" : 8 } { "_id" : ObjectId("543e104fe2c90313035e7cef"), "name" : "tuzuoquan", "age" : 9 } { "_id" : ObjectId("543e104fe2c90313035e7cf0"), "name" : "tuzuoquan", "age" : 10 } { "_id" : ObjectId("543e104fe2c90313035e7cf1"), "name" : "tuzuoquan", "age" : 11 } { "_id" : ObjectId("543e104fe2c90313035e7cf2"), "name" : "tuzuoquan", "age" : 12 } { "_id" : ObjectId("543e104fe2c90313035e7cf3"), "name" : "tuzuoquan", "age" : 13 } { "_id" : ObjectId("543e104fe2c90313035e7cf4"), "name" : "tuzuoquan", "age" : 14 } { "_id" : ObjectId("543e104fe2c90313035e7cf5"), "name" : "tuzuoquan", "age" : 15 } { "_id" : ObjectId("543e104fe2c90313035e7cf6"), "name" : "tuzuoquan", "age" : 16 } { "_id" : ObjectId("543e104fe2c90313035e7cf7"), "name" : "tuzuoquan", "age" : 17 } Type "it" for more >?
? > db.c4.find().count(); 34 > db.c4.find({age:{$ne:20}}).count(); 32 > db.c4.find({age:{$ne:2}}).count(); 33 >?
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| E :分頁 db.c4.find().skip(0).limit(10); > db.c4.find().skip(0).limit(10); { "_id" : ObjectId("543e0b6ae2c90313035e7ce3"), "name" : "lisi", "age" : 24 } { "_id" : ObjectId("543e0d96e2c90313035e7ce4"), "name" : "wangwu", "age" : 20 } { "_id" : ObjectId("543e0da0e2c90313035e7ce5"), "name" : "zhaoliu", "age" : 25 } { "_id" : ObjectId("543e0da8e2c90313035e7ce6"), "name" : "tianqi", "age" : 25 } { "_id" : ObjectId("543e104fe2c90313035e7ce7"), "name" : "tuzuoquan", "age" : 1 } { "_id" : ObjectId("543e104fe2c90313035e7ce8"), "name" : "tuzuoquan", "age" : 2 } { "_id" : ObjectId("543e104fe2c90313035e7ce9"), "name" : "tuzuoquan", "age" : 3 } { "_id" : ObjectId("543e104fe2c90313035e7cea"), "name" : "tuzuoquan", "age" : 4 } { "_id" : ObjectId("543e104fe2c90313035e7ceb"), "name" : "tuzuoquan", "age" : 5 } { "_id" : ObjectId("543e104fe2c90313035e7cec"), "name" : "tuzuoquan", "age" : 6 } >?
Eg：查詢第
|
?
總結
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