package com.jaeson.mongodb; import java.util.ArrayList; import java.util.List; import org.bson.Document; import com.mongodb.Block; import com.mongodb.MongoClient; import com.mongodb.MongoCredential; import com.mongodb.ServerAddress; //import com.mongodb.MongoClientURI; import com.mongodb.client.MongoDatabase; import com.mongodb.client.MongoCollection; import com.mongodb.client.FindIterable; import com.mongodb.client.MongoCursor; import com.mongodb.client.model.Filters; import com.mongodb.client.model.Sorts; import com.mongodb.client.model.Projections; public class MongodbTest { @SuppressWarnings("unused") public static void connectServer() { try { // 连接到 mongodb 服务 MongoClient mongoClient = new MongoClient( "localhost" , 27017 ); //MongoClientURI connectionString = new MongoClientURI("mongodb://localhost:27017"); //MongoClient mongoClient = new MongoClient(connectionString); //MongoClient mongoClient = new MongoClient( // Arrays.asList(new ServerAddress("localhost", 27017), // new ServerAddress("localhost", 27018))); //Get A List of Databases for (String name: mongoClient.listDatabaseNames()) { System.out.println(name); } //drop database //mongoClient.getDatabase("databaseToBeDropped").drop(); // 连接到数据库 MongoDatabase mongoDatabase = mongoClient.getDatabase("mydb"); System.out.println("Connect to database successfully"); mongoClient.close(); } catch(Exception e) { System.err.println( e.getClass().getName() + ": " + e.getMessage() ); } } @SuppressWarnings("unused") public static void connectServer(String username, String password) { try { //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"); System.out.println("Connect to database successfully"); mongoClient.close(); } catch (Exception e) { System.err.println( e.getClass().getName() + ": " + e.getMessage() ); } } public static void createCollection() { try{ // 连接到 mongodb 服务 MongoClient mongoClient = new MongoClient( "localhost" , 27017 ); // 连接到数据库 MongoDatabase mongoDatabase = mongoClient.getDatabase("mydb"); System.out.println("Connect to database successfully"); mongoDatabase.createCollection("mycol"); System.out.println("集合创建成功"); //Get A List of Collections for (String name : mongoDatabase.listCollectionNames()) { System.out.println(name); } MongoCollection<Document> collection = mongoDatabase.getCollection("mycol"); System.out.println("集合 mycol 选择成功"); // create an ascending index on the "i" field, 1 = ascending, -1 = descending collection.createIndex(new Document("i", 1)); //Get a List of Indexes on a Collection for (final Document index : collection.listIndexes()) { System.out.println(index.toJson()); } //drop collection //collection.dropCollection(); mongoClient.close(); } catch(Exception e) { System.err.println( e.getClass().getName() + ": " + e.getMessage() ); } } public static void insert() { try{ // 连接到 mongodb 服务 MongoClient mongoClient = new MongoClient( "localhost" , 27017 ); // 连接到数据库 MongoDatabase mongoDatabase = mongoClient.getDatabase("mydb"); System.out.println("Connect to database successfully"); MongoCollection<Document> collection = mongoDatabase.getCollection("mycol"); System.out.println("集合 mycol 选择成功"); //插入文档 /** * 1. 创建文档 org.bson.Document 参数为key-value的格式 * 2. 创建文档集合List<Document> * 3. 将文档集合插入数据库集合中 mongoCollection.insertMany(List<Document>) 插入单个文档可以用 mongoCollection.insertOne(Document) */ 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); //collection.insertOne(document); System.out.println("文档插入成功"); mongoClient.close(); } catch(Exception e) { System.err.println( e.getClass().getName() + ": " + e.getMessage() ); } } public static void find() { try{ // 连接到 mongodb 服务 MongoClient mongoClient = new MongoClient( "localhost" , 27017 ); // 连接到数据库 MongoDatabase mongoDatabase = mongoClient.getDatabase("mydb"); System.out.println("Connect to database successfully"); MongoCollection<Document> collection = mongoDatabase.getCollection("mycol"); System.out.println("集合 mycol 选择成功,count=" + collection.count()); //检索所有文档 /** * 1. 获取迭代器FindIterable<Document> * 2. 获取游标MongoCursor<Document> * 3. 通过游标遍历检索出的文档集合 */ FindIterable<Document> findIterable = collection.find(); MongoCursor<Document> mongoCursor = findIterable.iterator(); while (mongoCursor.hasNext()) { System.out.println(mongoCursor.next()); } List<Document> foundDocument = collection.find().into(new ArrayList<Document>()); for (Document document : foundDocument) { System.out.println(document.toJson()); } //find first Document myDoc = collection.find(Filters.eq("likes", 100)).first(); System.out.println(myDoc.toJson()); //find 50 < likes <= 200 Block<Document> printBlock = new Block<Document>() { @Override public void apply(final Document document) { System.out.println(document.toJson()); } }; collection.find(Filters.and(Filters.gt("likes", 50), Filters.lte("likes", 200))).forEach(printBlock); //sort by likes desc myDoc = collection.find(Filters.exists("likes")).sort(Sorts.descending("likes")).first(); System.out.println(myDoc.toJson()); //exclude the _id field myDoc = collection.find().projection(Projections.excludeId()).first(); System.out.println(myDoc.toJson()); mongoClient.close(); } catch(Exception e) { System.err.println( e.getClass().getName() + ": " + e.getMessage() ); } } public static void update() { try{ // 连接到 mongodb 服务 MongoClient mongoClient = new MongoClient( "localhost" , 27017 ); // 连接到数据库 MongoDatabase mongoDatabase = mongoClient.getDatabase("mydb"); System.out.println("Connect to database successfully"); MongoCollection<Document> collection = mongoDatabase.getCollection("mycol"); System.out.println("集合 mycol 选择成功"); //更新文档 将文档中likes=100的文档修改为likes=200 //collection.updateOne(Filters.eq("likes", 100), new Document("$set",new Document("likes",200))); collection.updateMany(Filters.eq("likes", 100), new Document("$set",new Document("likes",200))); //更新文档 将文档中likes=100的文档的likes 增加50 collection.updateMany(Filters.eq("likes", 100), new Document("$inc", new Document("likes", 50))); //检索查看结果 FindIterable<Document> findIterable = collection.find(); MongoCursor<Document> mongoCursor = findIterable.iterator(); while (mongoCursor.hasNext()) { System.out.println(mongoCursor.next()); } mongoClient.close(); } catch(Exception e) { System.err.println( e.getClass().getName() + ": " + e.getMessage() ); } } public static void delete() { try{ // 连接到 mongodb 服务 MongoClient mongoClient = new MongoClient( "localhost" , 27017 ); // 连接到数据库 MongoDatabase mongoDatabase = mongoClient.getDatabase("mydb"); System.out.println("Connect to database successfully"); MongoCollection<Document> collection = mongoDatabase.getCollection("mycol"); System.out.println("集合 mycol 选择成功"); //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)); //检索查看结果 FindIterable<Document> findIterable = collection.find(); MongoCursor<Document> mongoCursor = findIterable.iterator(); while (mongoCursor.hasNext()) { System.out.println(mongoCursor.next()); } mongoClient.close(); } catch(Exception e) { System.err.println( e.getClass().getName() + ": " + e.getMessage() ); } } public static void main(String[] args) { } }
mongodb 实例
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转载自jaesonchen.iteye.com/blog/2298867
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