我想从C_运行下面的Mongo查询。目前我正在使用MongoDBC驱动程序2.7db.changelog.find({}).forEach(function(doc){//makejavascriptobjectdynimacallyvarnewDoc={"key":"value","doc":doc}db.changelog_log.insertOne(newDoc);})这已经成功地运行到mongoshell中,现在我想用modifyobject值从c应用程序中执行该脚本。我希望它能够解析这些查询并将它们传递给database.runcommand,但是我没有取得任何进展。varb
我是mongoDb的新手。我已经设置了两个集合。1)书2)评论book:_idtitleauthorpostedprice评论是:_idbookIdcommentstatus我想获取那些具有status=1的书的评论。这个我试过了。returnnewpromise((resolve,reject)=>{db.collection('book').aggregate([{$lookup:{from:'comments',localField:"_id",foreignField:"bookId",as:"comments"}}]).toArray().then((result)=>{if
这个问题在这里已经有了答案:MongoDBaddtojoiningcollectionfieldfrombaseone(1个回答)关闭4年前。我有这个问题:我需要进行查询,获取外部数据(通过查找),“多对多”和“一对多”。我的数据看起来是这样的:转移集合:{"_id":1,"requests":[{"service":1,"foo":"foo1","bar":"bar1"},{"service":2,"foo":"foo2","bar":"bar2"}]}因此,“service”字段是另一个集合“services”的外部ID。服务集合:[{_id:1,name:'Service1"},
我希望将此代码片段重现为Java代码:db.getCollection('admins_comptes_client_ceov4').aggregate([{$lookup:{from:"contrats_ceov4",localField:"CUSTOMERNUMBER",foreignField:"CUSTOMERNUMBER",as:"arrayForeignObject"}{$unwind:{path:"$arrayForeignObject",preserveNullAndEmptyArrays:true}},{$replaceRoot:{newRoot:{$mergeObj
[{"userId":"5bb6730721f28a295436b36e","reputationNumber":0,"questions":[],"answers":[],"id":"5bb6730721f28a295436b36f"},{"userId":"5bb6738c21f28a295436b370","reputationNumber":0,"questions":[],"answers":[],"id":"5bb6738c21f28a295436b371"}]我在模型userDatas中有2个元素,我想通过使用userId属性进行过滤来查找单个userData。这是我做的
我有一个Mongoose模式,其中包含一个具有特定索引的字段:constreportSchema=newmongoose.Schema({coords:{type:[Number],required:true,index:'2dsphere'},…}它在我的本地机器上运行良好,所以当我通过shell连接到MongoDB时,我得到了db.reports.getIndexes()的输出:[{"v":2,"key":{"_id":1},"name":"_id_","ns":"weatherApp.reports"},{"v":2,"key":{"coords":"2dsphere"},"na
我正在使用MongooseODMwrapper对于NodeJS,我担心注入(inject)攻击。假设我有以下架构:constUserSchema=newmongoose.Schema({userName:String,password:String});如果我要执行如下所示的登录请求:router.post('/login',(request,response)=>{constuserName=request.body.userName;constpassword=request.body.password;User.findOne({userName:userName},functi
这是单个文档:{_id:"...",firstName:"john",lastName:"Doe",cars:[{"_id":"...","carName":"BMW","carModel":"330","carColor":"silver"},{"_id":"...","carName":"Lexus","carModel":"IS300","carColor":"white"},{"_id":"...","carName":"LADA","carModel":"2106","carColor":"blue"}]}我正在尝试仅选择John'sBMW的“carColor”。像这样:db
我正在尝试将mongodb文档转换为矩阵格式例如对于这个输入[{username:"user1",result:[{subId:"sub1",marks:90},{subId:"sub4",marks:92},{subId:"sub3",marks:73}]},{username:"user3",result:[{subId:"sub3",marks:87},{subId:"sub5",marks:91},{subId:"sub2",marks:88}]}]输出应该是这样的sub1|sub2|sub3|sub4|sub5|======|=======|========|========
我完成了以下教程(https://medium.com/@rajanmaharjan/secure-your-mongodb-connections-ssl-tls-92e2addb3c89)以设置自签名SSL证书以保护设备与托管mongoDB数据库的服务器之间的通信。我可以使用以下命令从服务器和设备访问数据库:mongo--ssl--sslCAFile/path/to/CA.pem--sslPEMKeyFile/path/to/mongodb.pem--hostIP:port错误当我尝试使用C++程序连接到数据库时,出现段错误:段错误(核心转储)GDB的输出是程序收到信号SIGSEG