一、使用BasicDBObject 进行查询

查询条件设置

BasicDBObject queryCond = new BasicDBObject();

• 单个字段

queryCond.put("data_source", "诊断记录"); 

• in 的用法

queryCond.put("patient_id", new BasicDBObject("$in", patientIdList));

• 数组字段中匹配多个符合条件的值

queryCond.put("data", new BasicDBObject("$elemMatch", new BasicDBObject("key", "EGFR").append("value", "+")));

BasicDBObject query = new BasicDBObject();
BasicDBObject basicDbObject = new BasicDBObject();
LocalDateTime startTime = LocalDateTime.now();
basicDbObject.append("$gte", startTime.minusMonths(5));
basicDbObject.append("$lte", startTime.plusHours(2));
query.put("updateTime", basicDbObject);
long countDocuments = mongoTemplate.getCollection("book").countDocuments(query);
System.out.println(countDocuments);

• exists 用法 1 代表存在该字段，字段值为 null的也算

queryCond.put("time_point_id", new BasicDBObject("$exists", 1));

• 指定返回字段 0代表不返回，1代表返回，_id会默认返回（不返回需手动设置为0）

 BasicDBObject filterCond = new BasicDBObject();filterCond.put("_id", 0);filterCond.put("patient_id", 1);filterCond.put("data", 1);

• 设置字段排序 1表示升序，-1表示倒序

BasicDBObject sortCond = new BasicDBObject();
sortCond.put("survey_time", 1);

• 查询结果

MongoCursor<Document> cursor = mongoTemplate.getCollection("collection_name").find(queryCond).projection(filterCond).sort(sortCond).iterator();

• 遍历结果

while (cursor.hasNext()) {Document doc = cursor.next();Object pidObj = doc.get("patient_id");}

二、使用Query 和 Criteria 进行查询

/***根据patient_id获取MetadataHis中form_data.ZLFF=Immune的数据，返回结果按照exam_time升序排序*/private List<CdrData> findMedicationByPatienId(String patientId) {//设置mongo查询条件Query query = new Query();Criteria c =new Criteria();c.and("patient_id").is(patientId);c.and("sub_source").is("用药史");c.and("data").elemMatch(Criteria.where("key").is("ZID").and("value").is(groupIdVal));/*Criteria criteria = new Criteria("data");criteria.and("key").is("ZLFF");criteria.and("value").is("Immune");c.elemMatch(criteria);*/query.addCriteria(c);query.addCriteria(Criteria.where("data.key").is("Immune"));query.with(new Sort(Sort.Direction.ASC, "survey_time"));return mongoTemplate.find(query, CdrData.class);}

三、聚合查询，查出某一个字段出现次数前8的

  BasicDBObject queryCond = new BasicDBObject();queryCond.put("patient_id", new BasicDBObject("$in", patientTransferDepRepository.getPatientIdsByDep(depId)));Date startDate = null;Date endDate = null;if (month == null) {//统计当前年份 全部数据startDate = DateUtils.getYearFirst(year);endDate = DateUtils.getYearLast(year);} else {//统计当前 年-月 数据//手术时间在当年当月第一天和最后一天时间范围内(工具类month从0开始，此处month是从1开始，所以month-1)startDate = DateUtils.getFirstDayOfMonth(year, month-1);endDate = DateUtils.getLastDayOfMonth(year, month-1);}queryCond.put("survey_time", new BasicDBObject("$gte", DateUtils.parseDate(DateUtils.formatDate(startDate)+ " 00:00:00")).append("$lte", DateUtils.parseDate(DateUtils.formatDate(endDate)+ " 23:59:59")));aggregateCondList.add(new BasicDBObject("$match", queryCond));//unwindaggregateCondList.add(new BasicDBObject("$unwind", "$data"));// ZDLB 改为 手术名称的code(SSMC)aggregateCondList.add(new BasicDBObject("$match", new BasicDBObject("data.key", "SSMC")));//聚合条件 取出该年该月 手术名称：相应次数aggregateCondList.add(new BasicDBObject("$group", new BasicDBObject("_id", "$data.value").append("count" , new BasicDBObject("$sum", 1))));//排序，取手术名称对应次数前8的aggregateCondList.add(new BasicDBObject("$sort", new BasicDBObject("count", -1)));aggregateCondList.add(new BasicDBObject("$limit", 8));Map<String, Integer> resultMap = new LinkedHashMap<>(8);//遍历结果集MongoCursor<Document> cursor = mdcMongoTemplate.getCollection(CDR_DATA).aggregate(aggregateCondList).iterator();