Java实现MongoDB查询

接上篇，插入测试成功后，接下来进行查询
检索条件主要使用DBObject接口，BasicDBObject实现类

/**
 * 查询测试
 */
@Test
public void selectTest() {

    Calendar calendar = Calendar.getInstance();
    /* 之前一小时的数据 */

    //========== 1 进行插入
    HotAnls hot = new HotAnls();
    hot.setCategory(1);
    hot.setDateRange(7);
    hot.setHotFeelIndex(90L);
    hot.setWorkTime(new Date());
    mongoTemplate.save(hot);

    //========== 2 进行检索
    // 创建DBObject 存储操作用条件用的
    DBObject cond = new BasicDBObject();
    // 添加条件category = 1
    cond.put("category", 1);
    // 添加条件 >= 一小时前
    calendar.set(Calendar.HOUR_OF_DAY, calendar.get(Calendar.HOUR_OF_DAY) - 1);
    cond.put("workTime", new BasicDBObject(QueryOperators.GTE, calendar.getTime()));
    // 添加OR条件，与上面是AND关系，下面两个hotFeelIndex是OR关系
    BasicDBList orList = new BasicDBList();
    DBObject orCond1 = new BasicDBObject();
    orCond1.put("hotFeelIndex", 90);
    DBObject orCond2 = new BasicDBObject();
    orCond2.put("hotFeelIndex", 30);
    orList.add(orCond1);
    orList.add(orCond2);
    // 创建OR关系
    cond.put(QueryOperators.OR, orList);
    //限制查询返回的字段 0或者1 只能同时存在一种
    DBObject feild = new BasicDBObject();
    feild.put("dateRange", 1);//查询
    // feild.put("_id", 0);//不查询
    Query query = new BasicQuery(cond, feild);
    query.with(new Sort(Sort.Direction.DESC, "age"));

    // 限制条数
    query.skip(0).limit(50);
    // 查询 返回list
    List result = mongoTemplate.find(query, HashMap.class, "hotAnls");
    System.out.println(result.toString());
}