简述使用java操作MongoDB详解大数据

1.环境准备

下载mongoDB对Java支持的驱动包

驱动包下载地址：https://github.com/mongodb/mongo-java-driver/downloads


2.查询集合中所有文档

Mongo mongo = new Mongo( localhost ,27017);

DB db = mongo.getDB( test );

DBCollection collection = db.getCollection( customer );

DBCursor dbCursor = collection.find();

System.out.println(collection.getCount());

while(dbCursor.hasNext()){

   System.out.println(dbCursor.next());

}

mongo.close();


3.删除集合中的文档

Mongo mongo = new Mongo( localhost ,27017);

DB db = mongo.getDB( test );

DBCollection collection = db.getCollection( customer );

BasicDBObject o = new BasicDBObject( _id , new ObjectId( 5199ee647d5fc789bc760c07 ));

collection.remove(o);

mongo.close();


4.向集合中插入文档

Mongo mongo = new Mongo( localhost ,27017);

DB db = mongo.getDB( test );

DBCollection collection = db.getCollection( customer );

DBObject c = new BasicDBObject();

c.put( name , “jack );

c.put( age , 24);

collection.insert(c);

mongo.close();


5.更新集合中的文档

Mongo mongo = new Mongo( localhost ,27017);

DB db = mongo.getDB( test );

DBCollection collection = db.getCollection( customer );

BasicDBObject query = new BasicDBObject( _id ,new ObjectId( 519e2e393296cf3baccdb10c ));

BasicDBObject object = (BasicDBObject) collection.findOne(query);

object.put( name , “wangwu );

int n = collection.update(query, object).getN();

System.out.println(n);

mongo.close();


6.总结

以上是java操作MongoDB数据库的增删改查的基础方法，希望对你有所帮助。

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原创文章，作者：ItWorker，如若转载，请注明出处：https://blog.ytso.com/9696.html