数据库.MongoDB.Java样例

Posted 2020-10-10 幻河

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

 1 package com.test;
 2 
 3 import java.util.Arrays;
 4 
 5 import org.bson.Document;
 6 
 7 import com.mongodb.MongoClient;
 8 import com.mongodb.client.MongoCollection;
 9 import com.mongodb.client.MongoDatabase;
10 
11 public class MongoDb_Test2 {
12     public static void main(String[] args) {  
13         MongoClient mongoClient = new MongoClient( "localhost" , 27017 );
14         MongoDatabase database = mongoClient.getDatabase("mydb");
15         MongoCollection<Document> collection = database.getCollection("test");
16         System.out.println(collection.count());
17         Document doc = new Document("name", "MongoDB")
18         .append("type", "database")
19         .append("count", 1)
20         .append("versions", Arrays.asList("v3.2", "v3.0", "v2.6"))
21         .append("info", new Document("x", 203).append("y", 102));
22         collection.insertOne(doc);
23         System.out.println(collection.count());
24         System.out.println("done!");
25     }
26 }

 

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();