MongoDB和Java-PHP

一、java操作mongoDB

配置环境：

1、下mongodb JDBC驱动mongo-java-driver-3.2.2.jar,并包含在classpath中

步骤：

1、连接数据库

 // 连接到 mongodb 服务
 MongoClient mongoClient = new MongoClient( "localhost" , 27017 );
 // 连接到数据库
 MongoDatabase mongoDatabase =mongoClient.getDatabase("mycol");

2、如果需要验证用户名和密码，则

 //连接到MongoDB服务 如果是远程连接可以替换“localhost”为服务器所在IP地址
 //ServerAddress()两个参数分别为 服务器地址 和 端口
 ServerAddress serverAddress = new ServerAddress("localhost",27017);
 List<ServerAddress> addrs = new ArrayList<ServerAddress>();
 addrs.add(serverAddress);
 //MongoCredential.createScramSha1Credential()三个参数分别为 用户名 数据库名称 密码
 MongoCredential credential =MongoCredential.createScramSha1Credential("username", "databaseName", "password".toCharArray());
 List<MongoCredential> credentials = new ArrayList<MongoCredential>();  credentials.add(credential);
 //通过连接认证获取MongoDB连接
 MongoClient mongoClient = new MongoClient(addrs,credentials);
 //连接到数据库
 MongoDatabase mongoDatabase =mongoClient.getDatabase("databaseName"); 

3、操作数据库

创建集合

 mongoDatabase.createCollection("test");

获取集合

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

插入文档

 Document document = new Document("title", "MongoDB").
 append("description", "database").
 append("likes", 100).
 append("by", "Fly");
 List<Document> documents = new ArrayList<Document>();
 documents.add(document);
 collection.insertMany(documents); 

获取文档

 FindIterable<Document> findIterable = collection.find();  //获取迭代器
 MongoCursor<Document> mongoCursor = findIterable.iterator();  //获取游标
 while(mongoCursor.hasNext()){
        System.out.println(mongoCursor.next());
 }  

更新文档

 //更新文档   将文档中likes=100的文档修改为likes=200
 collection.updateMany(Filters.eq("likes", 100), new Document("$set",new Document("likes",200)));  

删除文档

 //删除符合条件的第一个文档
 collection.deleteOne(Filters.eq("likes", 200));
 //删除所有符合条件的文档
 collection.deleteMany (Filters.eq("likes", 200));