mongodb-java

问题 When using the MongoDB API in Java, I am trying to retrieve the value of two in a document that looks like this: data-id: "1234" one: two: "three" And I am running this: MongoCollection<Document> documents = ...; Document document = documents.find(Filters.eq("data-id", "1234")).first(); // Not null document.get("one"); // Not null document.get("one.two"); // This is null ((Document) document.get("one")).get("two"); // Not null After spending some time reading documentation and other Stack

问题 I am using mongo database for my application for connection spooling in configured the below mongoOption while creating connection MongoOptions options = new MongoOptions(); options.autoConnectRetry = true; options.connectionsPerHost = 40; options.threadsAllowedToBlockForConnectionMultiplier = 25; while exceuting my application,getting the following exception com.mongodb.MongoInterruptedException: A driver operation has been interrupted at com.mongodb.DBPortPool.get(DBPortPool.java:216) at

问题 I am working on some test program for SpringData MongoDB , I have done it same as it's mentioned on http://static.springsource.org/spring-data/data-document/docs/1.0.0.M2/reference/html/#mongo.core. But it's showing exceptions: package com.springMongo.core; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.springframework.context.ApplicationContext; import org.springframework.context.annotation.AnnotationConfigApplicationContext; import org

问题 I am working on some test program for SpringData MongoDB , I have done it same as it's mentioned on http://static.springsource.org/spring-data/data-document/docs/1.0.0.M2/reference/html/#mongo.core. But it's showing exceptions: package com.springMongo.core; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.springframework.context.ApplicationContext; import org.springframework.context.annotation.AnnotationConfigApplicationContext; import org

问题 I have an aggregation query as follows : db.TWITTER_DATA_Processed.aggregate( {$match : { SpId : 840, Scheduler_id : "SCH_01" }},{$group : {_id : {SpId : "$SpId", Scheduler_id : "$Scheduler_id",Country : "$Country"}, positive_count : { $sum: { $cond: [ { $gt: [ "$Sentiment", 0 ] } , 1, 0 ] } }, neutral_count : { $sum: { $cond: [ { $eq: [ "$Sentiment", 0 ] } , 1, 0 ] } }, negative_count : { $sum: { $cond: [ { $lt: [ "$Sentiment", 0 ] } , 1, 0 ] } }}}) Sample output : { "_id" : { "SpId" : 840,

问题 I want to get only the objectId from mongodb with matched crieteria.I can get it with dbobject and cursor method.But I used mongo client here and have no idea how to do it. Thanking you MongoClient client = new MongoClient("localhost", 27017); MongoDatabase database = client.getDatabase("baazaronline"); MongoCollection<Document> collection = database .getCollection("Attribute"); Bson filter = new Document("attcode", attcode); Bson newValue = new Document("DefautV", DefautV).append("IVSO",

问题 I want to get only the objectId from mongodb with matched crieteria.I can get it with dbobject and cursor method.But I used mongo client here and have no idea how to do it. Thanking you MongoClient client = new MongoClient("localhost", 27017); MongoDatabase database = client.getDatabase("baazaronline"); MongoCollection<Document> collection = database .getCollection("Attribute"); Bson filter = new Document("attcode", attcode); Bson newValue = new Document("DefautV", DefautV).append("IVSO",

问题 I want to get only the objectId from mongodb with matched crieteria.I can get it with dbobject and cursor method.But I used mongo client here and have no idea how to do it. Thanking you MongoClient client = new MongoClient("localhost", 27017); MongoDatabase database = client.getDatabase("baazaronline"); MongoCollection<Document> collection = database .getCollection("Attribute"); Bson filter = new Document("attcode", attcode); Bson newValue = new Document("DefautV", DefautV).append("IVSO",

问题 I am running the same aggregation pipeline with a Spark Application and on the Mongos console. On the console, the data is fetched within the blink of an eye, and only a second use of "it" is needed to retrieve all expected data. The Spark Application however takes almost two minutes according to the Spark WebUI. As you can see, 242 tasks are being launched to fetch the result. I am not sure why such an high amount of tasks is launched while there are only 40 documents being returned by the

问题 I am running the same aggregation pipeline with a Spark Application and on the Mongos console. On the console, the data is fetched within the blink of an eye, and only a second use of "it" is needed to retrieve all expected data. The Spark Application however takes almost two minutes according to the Spark WebUI. As you can see, 242 tasks are being launched to fetch the result. I am not sure why such an high amount of tasks is launched while there are only 40 documents being returned by the