查找集合Java Mongodb中的所有对象

本文介绍了查找集合Java Mongodb中的所有对象的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

下面的代码在集合中找到第一个文档:

Below code finds the first document in a collection :

package database; import com.mongodb.BasicDBObject; import com.mongodb.BulkWriteOperation; import com.mongodb.BulkWriteResult; import com.mongodb.Cursor; import com.mongodb.DB; import com.mongodb.DBCollection; import com.mongodb.DBCursor; import com.mongodb.DBObject; import com.mongodb.MongoClient; import com.mongodb.ParallelScanOptions; import com.mongodb.ServerAddress; import java.UnknownHostException; import java.util.List; import java.util.Set; import static java.util.concurrent.TimeUnit.SECONDS; // based on mongodb.github.io/mongo-java-driver/2.13/getting-started/quick-tour/ public class Mongo { public void getCon() { // or MongoClient mongoClient; try { mongoClient = new MongoClient("localhost", 27017); DB db = mongoClient.getDB("mydb"); DBCollection coll = db.getCollection("testCollection"); BasicDBObject doc = new BasicDBObject("name", "MongoDB") .append("type", "database") .append("count", 1) .append("info", new BasicDBObject("x", 203).append("y", 102)); coll.insert(doc); coll.findOne(); } catch (UnknownHostException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }

似乎没有findAll方法.如何在集合testCollection中找到所有文档?

There does not appear to be a findAll method. How to find all the documents in the collection testCollection ?

推荐答案

您必须使用 DBCollection.find() 方法，

You have to use the DBCollection.find() method, which

选择集合中的所有文档，然后将光标移至所选文档.

Select all documents in collection and get a cursor to the selected documents.

所以，您要做的是:

DBCursor cursor = coll.find(); while (cursor.hasNext()) { DBObject obj = cursor.next(); //do your thing }