MongoDB日常操作

最近项目中使用MongoDB进行存入统计相关的数据，便于查寻且提高效率。

首先在项目中引入MongoDB：

1.加入依赖

<dependency>
     <groupId>org.springframework.boot</groupId>
     <artifactId>spring-boot-starter-data-mongodb</artifactId>
</dependency>

2.配置application.yml

spring:
  data:
    mongodb:
      host: ${MONGO_HOST:localhost}
      port: 27017
      database: student_statistics
#      username:
#      password:

操作MongoDB

1.注入 MongoTemplate 类直接对MongoDB进行操作

@Autowired
private MongoTemplate mongoTemplate;

2.1聚合查寻

//封装查询条件
List<AggregationOperation> operations = new ArrayList<>();

if (StringUtils.isNotBlank(startTime) && StringUtils.isNotBlank(endTime)) {
    operations.add(Aggregation.match(Criteria.where("createTime").in(timeList)));
}
if (CollectionUtils.isNotEmpty(schoolIds)) {
    operations.add(Aggregation.match(Criteria.where("schoolId").in(schoolIds)));
}

// 聚合分组
operations.add(Aggregation.group("createTime")
        .count().as("totalNum")
        .sum("signNum").as("totalSignNum")
);

// 列举要查寻的数据，并对聚合字段做别名(project后面的参数即为要查寻和显示的字段)，否则聚合字段恒为_id
operations.add(Aggregation.project("createTime","maybeContinueNum","alreadyContinueNum").and("createTime").previousOperation());
Aggregation aggregation = Aggregation.newAggregation(operations);
AggregationResults<GeekDataContinueRateRangeOut> results = mongoTemplate.aggregate(aggregation, collection, Out.class);

List<GeekDataContinueRateRangeOut> queryResultList = results.getMappedResults();

2.2 普通查询并排序

//封装查询条件
Query query = new Query();
if (CollectionUtils.isNotEmpty(schoolIds)) {
    query.addCriteria(Criteria.where(StatisticsConst.QUERY_CONDITION_SCHOOLAREAID).in(schoolIds));
}
if (StringUtils.isNotBlank(createTime)) {
    query.addCriteria(Criteria.where(StatisticsConst.QUERY_CONDITION_CREATETIME).is(createTime));
}
long count = mongoTemplate.count(query, collectionName);
Criteria criteria = new Criteria();
criteria.orOperator(Criteria.where(StatisticsConst.QUERY_CONDITION_REFUND_NUM).is(1),
        Criteria.where(StatisticsConst.QUERY_CONDITION_PRE_REFUND_NUM).is(1),
        Criteria.where(StatisticsConst.QUERY_CONDITION_CARRYOVER_REFUND_NUM).is(1));
query.addCriteria(criteria);
query.with(Sort.by(Sort.Direction.DESC,StatisticsConst.QUERY_CONDITION_OUT_CLASS_DATE));

// 查寻
List<RefundOut> refundOuts = mongoTemplate.find(query, RefundOut.class, collectionName);

3.打印sql，在application.yml中配置log级别，即可在控制台打印执行的sql，但不能直接在Navicat执行，需要简单处理下格式。

logging:
  level:
    org.springframework.data.mongodb.core.MongoTemplate: DEBUG

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