我有多个这样的文件:{"IMDBURL":"http:\/\/us.imdb.com\/M\/title-exact?Schrei%20aus%20Stein%20(1991)","release_date":"08-Mar-1996","ratings":[{"user_id":916,"rating":3,"timestamp":"880845755"}],"genre":["Drama","Thriller"],"video":"","title":"ScreamofStone(SchreiausStein)(1991)"}并且我尝试显示电影的标题及其所属类型的数量。目前我是这样

我的mongo数据库包含一个集合'Shops'，数据如下:{"_id":ObjectId("XXXX1b83d2b227XXXX"),"ShopId":435,"products":[{"productId":"1234","productName":"nonveg","productCategory":"meals","mrp":"38",},{"productId":"5234","productName":"nonveg","productCategory":"meals","mrp":"38",},{"productId":"6234","productName":"apple

虽然我有ID为13163的记录(db.locations.find({_id:13163}))，但它给我错误:Mongoid::Errors::DocumentNotFoundinLocationsController#showProblem:Document(s)notfoundforclassLocationwithid(s)13163.Summary:WhencallingLocation.findwithanidorarrayofids,eachparametermustmatchadocumentinthedatabaseorthiserrorwillberaised.The

为了我的意图，我必须选择一个表以从已经给出的表的列值中选择列。首先，我考虑了一个案例构造，如果可以使用SQLite。SELECT*FROMCASEIFmyTable.column1="value1"THEN(SELECT*FROMtable1WHERE...)ELSEIFmyTable.column1="value2"THEN(SELECT*FROMtable2WHERE...)END;我是SQL的新手。哪种构造将是最简洁（不是丑陋）的解决方案，如果我不能在sqlite中拥有它，那么什么RDBM将是最适合的？谢谢看答案这是将Mytable中每个条目之一与每个条目之一相关联的一个建议。IE。这就

所以我尝试使用sudopeclinstallmongodb安装mongodbpecl扩展并获得以下内容:downloadingmongodb-1.1.2.tgz...Startingtodownloadmongodb-1.1.2.tgz(642,582bytes)....done:642,582bytes349sourcefiles,buildingrunning:phpizeConfiguringfor:PHPApiVersion:20151012ZendModuleApiNo:20151012ZendExtensionApiNo:320151012buildingin/var/tm

我正在使用Mongodb3.2.0Mongo-Java-Driver3.2.0spring-data-mongodb1.9.2并引用此链接accessing-mongodb-with-authentication,并通过以管理员身份登录管理数据库在myDb中创建用户。db.createUser({user:"admin",pwd:"password",roles:[{role:"readWrite",db:"myDb"}]});db.auth('admin','password');db.grantRolesToUser("admin",[{role:"dbAdmin",db:"myD

我搜索了很长时间和很多关于这个问题的话题。直到现在我找不到任何解决方案。此外，这对我来说并不是很清楚，希望你能提供帮助。这是我的问题:我设计了一个Meteor应用程序，MongoDB中有一个包含订单的集合。该集合通过读取csv文件来填充import_file_orders=function(file){varlines=file.split('%\r\n');varl=lines.length-1;for(vari=0;i读取CSV文件后，集合中的某些文档存在错误:duplicatekeyerrorindex:protocolplanner.Orders.$_id_dupkey:{:"

在Db中我有一些示例数据:对象1"_id":ObjectId("5b5934bb49b")"payment":{"paid_total":500,"name":"havi","payment_mode":"cash","pd_no":"PD20725001","invoices":[{"invoice_number":"IN11803831583"}],"type":"Payment"}对象2"_id":ObjectId("5b5934ee31e"),"patient":{"invoice_date":"2018-07-26","invoiceTotal":2000,"pd_no":"

我在尝试安装MEANstack后访问http://myipaddress:3000时收到这些304和404s$nodeserverExpressappstartedonport3000GET/304973msGET/lib/bootstrap/js/bootstrap.js404371msGET/lib/bootstrap/css/bootstrap.css404489msGET/lib/angular/angular.js404371msGET/lib/jquery/jquery.js404447msGET/lib/bootstrap/css/bootstrap-responsive

据我了解，以下代码应打印a根据我对运行时间的了解polymorphism.但是，当我运行以下代码时，它正在打印b:每JLS8.4.8.1，b1.m1不覆盖A1.M1，因此当调用A1.M1时，不应选择B1.M1packagea;publicinterfaceI1{publicObjectm1();}publicclassA1{Objectm1(){return"a";}}publicclassC1extendsb.B1implementsI1{publicstaticvoidmain(String[]args){a.A1a=newa.C1();System.out.println(a.m1())