MongoDB的java操作

1.连接mongo数据库

　　Mongo mongo = new Mongo("localhost",27017);
　　DB db =mongo.getDB("test");
　　DBCollection collections = db.getCollection("customer");

2.查询集合所有文档　

　　DBCursor dbCursor = collections.find();
　　while (dbCursor.hasNext()) {
    　　System.out.println(dbCursor.next().get("name"));
　　}
　　mongo.close();

3.删除集合中文档

　　//根据Id进行删除(id为特殊类型)
    BasicDBObject o = new BasicDBObject("_id" ,new ObjectId("321321fdf21312"));
　　//根据其他字段删除
    BasicDBObject o = new BasicDBObject("name" ,"zhangsan");
    collections.remove(o);
    mongo.close();

4.向集合插入文档

    BasicDBObject c = new BasicDBObject();
    c.put("name", "zhangsan");
    c.put("age", "24");
    collections.insert(c);
    mongo.close();

5.更新集合中的文档

    BasicDBObject query = new BasicDBObject("_id" ,new ObjectId("321321fdf21312"));
    BasicDBObject object = (BasicDBObject)collections.findOne(query);
    object.put("name","wangwu");
    collections.update(query, object);
    mongo.close();