mongoDB java 增删改查crud

1、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();

2、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();

3、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();

4、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();