共计 1911 个字符，预计需要花费 5 分钟才能阅读完成。
一、按照 in、eq、lte 等条件组合查询，同时添加 sort 和 limit1、原生
db.message.find(
{receiverRoleId: {$in: [1381073, 1381073]},
resourceType:3,
sendTime: {$lte: 1523355918300}
})
.sort({sendTime: -1})
.limit(10);
2、spring data mongoDB
Criteria criteria = Criteria.where(“receiverRoleId”).in(receiverRoleIds)
.and(“readState”).is(readState.getIndex())
.and(“sendTime”).lte(sendTime);
Query query = Query.query(criteria);
query.with(new Sort(Sort.Direction.DESC, “sendTime”));
query.limit(count);
mongoTemplate.find(query, Notification.class);
二、执行 update 操作，更新单个文档 1、原生
db.message.update(
{_id: 586537, readState: 2},
{$set: {readState: 1}},
{multi: false}
);
2、spring data mongoDB
Criteria criteria = Criteria.where(“_id”).is(id).and(“readState”).is(ReadState.UNREAD.getIndex());
Query query = Query.query(criteria);
Update update = Update.update(“readState”, ReadState.READ.getIndex());
mongoTemplate.updateFirst(query, update, Notification.class);
三、通过 findAndModify 命令更新文档并且返回更新之后的文档 (只能作用于单个文档)1、原生
db.message.findAndModify({
query: {_id: 586537, readState: 2},
update: {$set: {publishType: 1}},
new: true
});
2、spring data mongoDB
Query query = Query.query(Criteria.where(“_id”).is(2).and(“readState”).is(2));
Update update = Update.update(“publishType”, 1);
Notice updateResult = mongoTemplate.findAndModify(
query,
update,
FindAndModifyOptions.options().returnNew(true),
Notice.class
);
四、聚合操作 (根据某一字段 group，并且将文档中的某一字段合并到数组中，最后取数组中的第一个元素)1、原生
db.message.aggregate([
{$match: {toAffairId : {$in: [590934, 591016]}} },
{$sort: {sendTime: -1} },
{$group: {_id: “$toAffairId”, contents: {$push: “$content”}} },
{$project: {_id: 0, “affaiId”: “$_id”, contents: {$slice: [“$contents”, 1]} } }
]);
2、spring data mongoDB
Criteria criteria = Criteria.where(“toAffairId”).in(affairIds);
Aggregation aggregation = Aggregation.newAggregation(
match(criteria),
sort(Sort.Direction.DESC, “sendTime”),
group(“toAffairId”).push(“content”).as(“contents”),
AggregationResults<MobileDynamicMessageDataModel> results = mongoTemplate.aggregate(
aggregation,
collectionName,
MobileDynamicMessageDataModel.class
);
