mongodb 随笔
2021/8/11 19:36:26
本文主要是介绍mongodb 随笔,对大家解决编程问题具有一定的参考价值,需要的程序猿们随着小编来一起学习吧!
- 报错:db.collection.find({}, { "record" : 0 , "index.teacher_base_name" : 1 , "_id" : 0})
queryObject.fields().exclude("_id"); queryObject.fields().exclude("record"); queryObject.fields().include("index." + indexName);
- mongodb内容过大
/usr/bin/mongod --config /etc/mongod.conf --fork --wiredTigerCacheSizeGB 1
- Aggregation.group
db.teacher_record.aggregate([{$group: { _id: "$cardId", approvalStatus: { $first: "$approvalStatus" } }}]) { _id: {cardId:"$cardId", tenantId:"$tenantId"}, approvalStatus: { $push: "$approvalStatus" } } Aggregation.group("cardId", "tenantId") .first("operationUser.userName").as("operationUser.userName") .first("operationUser.unitName").as("operationUser.unitName") .first("approvalTime").as("approvalTime") .sum(ConditionalOperators.when(Criteria.where("approvalStatus").is(0)).then(1).otherwise(0)).as("pendingNum") .push("recordId").as("recordIds")
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