Spring Data MongoDB提供了MongoTemplate方便我们队Mongodb进行CRUD操作。

1.简单条件查询

单个条件查询

接口定义：

/**	 * 根据条件查询	 * @param query	 * @param collectionName	 * @return	 */	T findOne(Query query,String collectionName);

Dao实现方法：

@Resource	private MongoTemplate mongoTemplate;	@Override	public Order findOne(Query query, String collectionName) {		return mongoTemplate.findOne(query, Order.class,collectionName);	}

测试查询：使用Query

@Test	public void findOne(){		String collectionName = "order";		//查询条件为：onumber = 001		Query query = new Query(Criteria.where("onumber").is("001"));		Order order = orderMongoDao.findOne(query, collectionName);		System.out.println(order.getCname());	}

@Test	public void findOne2(){		String collectionName = "order";		//查询条件为：onumber = 001 and cname = kehu1		Query query = new Query(Criteria.where("onumber").is("001").and("cname").is("kehu1"));		Order order = orderMongoDao.findOne(query, collectionName);		System.out.println(order.getCname());	}

@Test	public void findOne3() {		String collectionName = "order";		// 查询条件为：onumber = 001 or onumber = 002		Query query = new Query(				new Criteria().orOperator(						Criteria.where("onumber").is("001"), 						Criteria.where("onumber").is("002"))				);		Order order = orderMongoDao.findOne(query, collectionName);		System.out.println(order.getCname());	}

测试查询：使用BasicQuery

@Test	public void findOne4() {		String collectionName = "order";		// 查询条件为：onumber=001		DBObject dbObject = new BasicDBObject();		dbObject.put("onumber", "001");		Query query = new BasicQuery(dbObject);		Order order = orderMongoDao.findOne(query, collectionName);		System.out.println(order.getCname());	}