Spring Data MongoDB：查詢

Spring Data MongoDB提供了MongoTemplate方便咱們隊Mongodb進行CRUD操做。

1.簡單條件查詢

單個條件查詢

接口定義：

/**
	 * 根據條件查詢
	 * @param query
	 * @param collectionName
	 * @return
	 */
	T findOne(Query query,String collectionName);

Dao實現方法：

@Resource
	private MongoTemplate mongoTemplate;

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

測試查詢：使用Query

@Test
	public void findOne(){
		String collectionName = "order";
		//查詢條件爲：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";
		//查詢條件爲：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";
		// 查詢條件爲：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());
	}

測試查詢：使用BasicQuery

@Test
	public void findOne4() {
		String collectionName = "order";
		// 查詢條件爲：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());
	}