数据库.MongoDB.Java样例

1.先在MongoDB官网下载Java驱动包

MongoDB Java Driver:

http://mongodb.github.io/mongo-java-driver/

JAR包下载列表

https://oss.sonatype.org/content/repositories/releases/org/mongodb/mongodb-driver/3.5.0/

2.程序样例

package com.test;

import java.util.Arrays;

import org.bson.Document;

import com.mongodb.MongoClient;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoDatabase;

public class MongoDb_Test2 {
    public static void main(String[] args) {  
        MongoClient mongoClient = new MongoClient( "localhost" , 27017 );
        MongoDatabase database = mongoClient.getDatabase("mydb");
        MongoCollection<Document> collection = database.getCollection("test");
        System.out.println(collection.count());
        Document doc = new Document("name", "MongoDB")
        .append("type", "database")
        .append("count", 1)
        .append("versions", Arrays.asList("v3.2", "v3.0", "v2.6"))
        .append("info", new Document("x", 203).append("y", 102));
        collection.insertOne(doc);
        System.out.println(collection.count());
        System.out.println("done!");
    }
}

执行结果:

读取数据样例

        FindIterable<Document> iterable = collection.find().limit(1);
        MongoCursor<Document> cursor = iterable.iterator();
        if(cursor.hasNext()) {
            Document user = (Document)cursor.next();
            System.out.println(user.get("name"));
            System.out.println(user.toString());
        }
        cursor.close();