Mongo实验

MongoDB数据库操作

Student:

{

“name”: “zhangsan”,

“score”: {

“English”: 69,

“Math”: 86,

“Computer”: 77

}

}

{

“name”: “lisi”,

“score”: {

“English”: 55,

“Math”: 100,

“Computer”: 88

}

}

1.根据上面给出的文档，完成如下操作：

（1）用MongoDB Shell设计出student集合；

cmd界面进入mongo命令

use mongodb_test

db.createCollection("Student")

db.Student.insertOne({name:'zhangsan',score:{English:69,Math:86,Computer:77}})

db.Student.insertOne({name:'lisi',score:{English:55,Math:100,Computer:88}})

（2）用find()方法输出两个学生的信息；

db.Student.find()

（3）用find()方法查询zhangsan的所有成绩(只显示score列)；

db.Student.find({name:'zhangsan'},{'score':1})

（4）修改lisi的Math成绩，改为95。

db.Student.updateOne({name:”lisi”},{$set:{“score.Math”:NumberInt(95)}})

db.Student.find({name:”lisi”})

2.根据上面已经设计出的Student集合，用MongoDB的Java客户端编程，实现如下操作：

（1）添加数据：English:45       Math:89 Computer:100

与上述数据对应的文档形式如下：

{

“name”: “scofield”,

“score”: {

“English”  : 45,

“Math”: 89,

“Computer”: 100

}

}

（2）获取scofield的所有成绩成绩信息(只显示score列)

代码：

package Mongo;

import com.mongodb.MongoClient;

import com.mongodb.client.MongoCollection;

import com.mongodb.client.MongoCursor;

import com.mongodb.client.MongoDatabase;

import org.bson.Document;

import java.util.ArrayList;

import java.util.List;

public class MongoDBJDBC {

public static void main(String[] args) {

MongoCollection<Document> collection = getCollection("mongodb_test","Student");

insert(collection);

find(collection);

}

public static MongoCollection<Document>getCollection(String dbName, String collectionName){

MongoClient mongoClient = new MongoClient("localhost",27017);

MongoDatabase mongoDatabase = mongoClient.getDatabase(dbName);

MongoCollection<Document> collection = mongoDatabase.getCollection(collectionName);

System.out.println("连接成功");

return  collection;

}

public static void insert(MongoCollection<Document> collection){

Document document=new Document("name","scofield").append("score", new Document("English",45).append("Math", 89).append("Computer",100));

List<Document> documents=new ArrayList<Document>();

documents.add(document);

collection.insertMany(documents);

System.out.println("插入成功！");

}

public static void find(MongoCollection<Document> collection){

try{

MongoCursor<Document> cursor= collection.find(new Document("name","scofield")).projection(new Document("score",1)).iterator();

while(cursor.hasNext()){

System.out.println(cursor.next().toJson());

}

}catch(Exception e){

System.out.println("查找失败");

System.err.println( e.getClass().getName() + ": " + e.getMessage() );

}

}

}

截图：