标签：basic ODB string before template 查询条件 pre criteria lte
mongo in查询数量较多时
时间对比：
4W条数据查询速度达到3-4S
优化后可以达到0.1S-0.2S
优化原理：mongo自动Bean转化功能性能较差，改用原生mongo游标方法读取MongoDB数据文档，并在内存中做bean转化
优化前
Query query = new Query();
queryAfter.addCriteria(Criteria.where("id").in(idList));
queryAfter.addCriteria(Criteria.where("time").gte(startTime).lte(endTime));
List<TestEntity> lists = mongoTemplate.find(queryBefore,TestEntity.class);
优化后
DBObject query1 = new BasicDBObject(); //setup the query criteria 设置查询条件
query1.put("id", new BasicDBObject("$in", idList));
query1.put("time", (new BasicDBObject("$gte", startTime)).append("$lte", endTime));
DBCursor dbCursor =mongoTemplate.getCollection("testEntity").find(query1);
List<TestEntity> list=new ArrayList<>();
while (dbCursor.hasNext()){
DBObject object=dbCursor.next();
TestEntity te=new TestEntity();
te.setId(object.get("_id").toString());
te.setTime((Date) object.get("time"));
list.add(te);
}
标签：basic ODB string before template 查询条件 pre criteria lte
原文地址：https://www.cnblogs.com/tianmh/p/12344827.html
