MangoDB在java中的实现

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

public class MongoDBJDBC{
public static void main( String args[] ){
try{
// 连接到 mongodb 服务
MongoClient mongoClient = new MongoClient( "localhost" , 27017 );

// 连接到数据库
MongoDatabase mongoDatabase = mongoClient.getDatabase("mycol");
System.out.println("Connect to database successfully");

}catch(Exception e){
System.err.println( e.getClass().getName() + ": " + e.getMessage() );
}
}
}

import java.util.ArrayList;
import java.util.List;
import com.mongodb.MongoClient;
import com.mongodb.MongoCredential;
import com.mongodb.ServerAddress;
import com.mongodb.client.MongoDatabase;

public class MongoDBJDBC {
public static void main(String[] args){
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");
} catch (Exception e) {
System.err.println( e.getClass().getName() + ": " + e.getMessage() );
}
}
}

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

public class MongoDBJDBC{
public static void main( String args[] ){
try{
// 连接到 mongodb 服务
MongoClient mongoClient = new MongoClient( "localhost" , 27017 );

// 连接到数据库
MongoDatabase mongoDatabase = mongoClient.getDatabase("mycol");
System.out.println("Connect to database successfully");
mongoDatabase.createCollection("test");
System.out.println("集合创建成功");

}catch(Exception e){
System.err.println( e.getClass().getName() + ": " + e.getMessage() );
}
}
}

import org.bson.Document;
import com.mongodb.MongoClient;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoDatabase;

public class MongoDBJDBC{
public static void main( String args[] ){
try{
// 连接到 mongodb 服务
MongoClient mongoClient = new MongoClient( "localhost" , 27017 );

// 连接到数据库
MongoDatabase mongoDatabase = mongoClient.getDatabase("mycol");
System.out.println("Connect to database successfully");

MongoCollection<Document> collection = mongoDatabase.getCollection("test");
System.out.println("集合 test 选择成功");
}catch(Exception e){
System.err.println( e.getClass().getName() + ": " + e.getMessage() );
}
}
}

import java.util.ArrayList;
import java.util.List;
import org.bson.Document;

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

public class MongoDBJDBC{
public static void main( String args[] ){
try{
// 连接到 mongodb 服务
MongoClient mongoClient = new MongoClient( "localhost" , 27017 );

// 连接到数据库
MongoDatabase mongoDatabase = mongoClient.getDatabase("mycol");
System.out.println("Connect to database successfully");

MongoCollection<Document> collection = mongoDatabase.getCollection("test");
System.out.println("集合 test 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);
System.out.println("文档插入成功");
}catch(Exception e){
System.err.println( e.getClass().getName() + ": " + e.getMessage() );
}
}
}

import org.bson.Document;
import com.mongodb.MongoClient;
import com.mongodb.client.FindIterable;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoCursor;
import com.mongodb.client.MongoDatabase;

public class MongoDBJDBC{
public static void main( String args[] ){
try{
// 连接到 mongodb 服务
MongoClient mongoClient = new MongoClient( "localhost" , 27017 );

// 连接到数据库
MongoDatabase mongoDatabase = mongoClient.getDatabase("mycol");
System.out.println("Connect to database successfully");

MongoCollection<Document> collection = mongoDatabase.getCollection("test");
System.out.println("集合 test 选择成功");

//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());
}

}catch(Exception e){
System.err.println( e.getClass().getName() + ": " + e.getMessage() );
}
}
}

import org.bson.Document;
import com.mongodb.MongoClient;
import com.mongodb.client.FindIterable;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoCursor;
import com.mongodb.client.MongoDatabase;
import com.mongodb.client.model.Filters;

public class MongoDBJDBC{
public static void main( String args[] ){
try{
// 连接到 mongodb 服务
MongoClient mongoClient = new MongoClient( "localhost" , 27017 );

// 连接到数据库
MongoDatabase mongoDatabase = mongoClient.getDatabase("mycol");
System.out.println("Connect to database successfully");

MongoCollection<Document> collection = mongoDatabase.getCollection("test");
System.out.println("集合 test 选择成功");

//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)));
//检索查看结果
FindIterable<Document> findIterable = collection.find();
MongoCursor<Document> mongoCursor = findIterable.iterator();
while(mongoCursor.hasNext()){
System.out.println(mongoCursor.next());
}

}catch(Exception e){
System.err.println( e.getClass().getName() + ": " + e.getMessage() );
}
}
}

import org.bson.Document;
import com.mongodb.MongoClient;
import com.mongodb.client.FindIterable;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoCursor;
import com.mongodb.client.MongoDatabase;
import com.mongodb.client.model.Filters;

public class MongoDBJDBC{
public static void main( String args[] ){
try{
// 连接到 mongodb 服务
MongoClient mongoClient = new MongoClient( "localhost" , 27017 );

// 连接到数据库
MongoDatabase mongoDatabase = mongoClient.getDatabase("mycol");
System.out.println("Connect to database successfully");

MongoCollection<Document> collection = mongoDatabase.getCollection("test");
System.out.println("集合 test 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());
}

}catch(Exception e){
System.err.println( e.getClass().getName() + ": " + e.getMessage() );
}
}
}