大家好，stackoverflow 用户，我目前面临一个关于 mongodb 和 nodejs 的问题。我正在尝试将数据插入到 mongodb 中，并且我已经准备好将所有数据插入到 mongodb 中。我用来插入的数据是一个 csv 类型的文件。
这是我的项目。我的项目中有一个客户端和服务器。服务器将从 CSV 文件中获取数据，监听客户端，并将数组内存空间中的 CSV 文件中的数据发送到客户端。客户端将连接到服务器，请求数据并将数据附加到 mongodb。
里面的以下代码client.js很可能会帮助我使用它的值将其附加到 mongodb 中。有人可以帮我吗？
monitoredItem.on("changed",function(dataValue){
console.log(" New Data Receive = ",dataValue.value.value);
});
我不确定如何将数据附加到 mongodb 中。
这是我的client.js
/*global require,console,setTimeout */
var opcua = require("node-opcua");
var async = require("async");
var fs = require("fs");
var csv = require("fast-csv");
var sleep = require("system-sleep");
var client = new opcua.OPCUAClient();
var endpointUrl = "opc.tcp://" + require("os").hostname() + ":4334/UA/MyLittleServer";
var the_session, the_subscription;
async.series([
// step 1 : connect to
function(callback) {
client.connect(endpointUrl,function (err) {
if(err) {
console.log(" cannot connect to endpoint :" , endpointUrl );
} else {
console.log("connected !");
console.log("Endpoint URL ", endpointUrl);
}
callback(err);
});
},
// step 2 : createSession
function(callback) {
client.createSession( function(err,session) {
if(!err) {
the_session = session;
}
callback(err);
});
},
// step 3 : browse
function(callback) {
the_session.browse("RootFolder", function(err,browse_result){
if(!err) {
browse_result[0].references.forEach(function(reference) {
console.log( reference.browseName.toString());
});
}
callback(err);
});
},
// step 4 : read a variable with readVariableValue
//function(callback) {
// the_session.readVariableValue("ns=2000;s=TEST", function(err,dataValue) {
// if (!err) {
// console.log(" free mem % = " , dataValue.toString());
// }
// callback(err);
// });
//},
// step 4' : read a variable with read
//function(callback) {
// var max_age = 0;
// var nodes_to_read = [
// { nodeId: "ns=2000;s=TEST", attributeId: opcua.AttributeIds.Value }
// ];
// the_session.read(nodes_to_read, max_age, function(err,nodes_to_read,dataValues) {
// if (!err) {
// console.log(" free mem % = " , dataValues[0]);
// }
// callback(err);
// });
//},
// function(callback){
// the_session.readVariableValue("ns=74;s=Dou", function(err,dataValue) {
// if(!err){
// console.log("Test Success", dataValue.toString());
// }
// callback(err);
// });
// },
//
// function(callback){
// the_session.readVariableValue("ns=74;s=Float", function(err,dataValue) {
// if(!err){
// console.log("Test Success", dataValue.toString());
// }
// callback(err);
// });
// },
//
// function(callback){
// the_session.readVariableValue("ns=74;s=String", function(err,dataValue) {
// if(!err){
// console.log("Test Success", dataValue.toString());
// }
// callback(err);
// });
// },
// function(callback){
// the_session.readVariableValue("ns=1;s=CSV", function(err, dataValue) {
// if(!err){
// console.log(dataValue.toString());
// sleep(5000);
// }
// callback(err);
// });
// },
// function(callback){
// the_session.readVariableValue("ns=1;s=CSV", function(err, dataValue) {
// if(!err){
// fs.createReadStream(dataValue.toString())
// console.log(dataValue.toString());
// sleep(5000);
// .pipe(csv())
// .on('data', function(data){
// console.log(csv);
// sleep(5000);
// })
// .op('end', function(data){
// console.log("Read Finish")
// });
// }
// callback(err);
// });
// },
// step 5: install a subscription and install a monitored item for 10 seconds
function(callback) {
the_subscription=new opcua.ClientSubscription(the_session,{
requestedPublishingInterval: 1000,
requestedLifetimeCount: 10,
requestedMaxKeepAliveCount: 2,
maxNotificationsPerPublish: 10,
publishingEnabled: true,
priority: 10
});
the_subscription.on("started",function(){
console.log("subscription started for 2 seconds - subscriptionId=",the_subscription.subscriptionId);
}).on("keepalive",function(){
console.log("keepalive");
}).on("terminated",function(){
callback();
});
setTimeout(function(){
the_subscription.terminate();
},10000000);
// install monitored item
var monitoredItem = the_subscription.monitor({
nodeId: opcua.resolveNodeId("ns=2000;s=TEST"),
attributeId: opcua.AttributeIds.Value
},
{
samplingInterval: 100,
discardOldest: true,
queueSize: 10
},
opcua.read_service.TimestampsToReturn.Both
);
console.log("-------------------------------------");
monitoredItem.on("changed",function(dataValue){
console.log(" New Data Receive = ",dataValue.value.value);
});
},
// close session
function(callback) {
the_session.close(function(err){
if(err) {
console.log("session closed failed ?");
}
callback();
});
}
],
function(err) {
if (err) {
console.log(" failure ",err);
} else {
console.log("done!");
}
client.disconnect(function(){});
}) ;这是我的server.js
/*global require,setInterval,console */
var opcua = require("node-opcua");
var fs = require("fs");
var csv = require("fast-csv");
var sleep = require("system-sleep");
var currentCount = 0;
var array = ["No New Data"];
fs.createReadStream('1000data.csv')
.pipe(csv())
.on('data', function(data){
array.push(JSON.stringify(data));
//sleep(5);
})
.on('end', function(data) {
});
// Let's create an instance of OPCUAServer
var server = new opcua.OPCUAServer({
port: 4334, // the port of the listening socket of the server
resourcePath: "UA/MyLittleServer", // this path will be added to the endpoint resource name
buildInfo : { //Information of the build, Retrieve the server information for the current instance of the db client
productName: "MySampleServer1",
buildNumber: "7658",
buildDate: new Date(2014,5,2)
}
});
function post_initialize() {
console.log("initialized");
function construct_my_address_space(server) {
var addressSpace = server.engine.addressSpace;
// declare a new object
var device = addressSpace.addObject({
organizedBy: addressSpace.rootFolder.objects,
browseName: "MyDevice"
});
// add some variables
// add a variable named MyVariable1 to the newly created folder "MyDevice"
var variable1 = 1;
// emulate variable1 changing every 500 ms
setInterval(function(){ variable1+=1; }, 1000);
addressSpace.addVariable({
componentOf: device,
browseName: "MyVariable1",
dataType: "Double",
value: {
get: function () {
return new opcua.Variant({dataType: opcua.DataType.Double, value: variable1 });
}
}
});
// var variableTest = "Test";
// addressSpace.addVariable({
// componentOf: device,
// nodeId: "ns=1;b=1020FFAA",
// browseName: "MyVariableTest",
// dataType: "String",
// value: {
// get: function () {
// return new opcua.Variant({dataType: opcua.DataType.String, value: variableTest });
// },
// set: function (variant) {
// variable2 = parseFloat(variant.value);
// return opcua.StatusCodes.Good;
// }
// }
// });
// server.jsonVar = server.engine.addVariable("MyDevice", {
// browseName: "JSONObject",
// dataType: "String",
// value: {
// get:function(){
// return new opcua.Variant({
// dataType: opcua.DataType.String,
// value: get_json_string()
// });
// }
// }
// });
// var varTestDou = addressSpace.addVariable({
// componentOf: device,
// nodeId: "ns=74;s=Dou",
// browseName : "VarD",
// dataType: "Double",
// value: new opcua.Variant({dataType: opcua.DataType.Double, value: [10.0,292.31,412.345,185,3453.245]})
// });
// var varTestFloat = addressSpace.addVariable({
// componentOf: device,
// nodeId: "ns=74;s=Float",
// browseName : "VarF",
// dataType: "Float",
// value: new opcua.Variant({dataType: opcua.DataType.Float, value: [10.0,402.23,123,34,643,34]})
// });
// var varTestString = addressSpace.addVariable({
// componentOf: device,
// nodeId: "ns=74;s=String",
// browseName : "VarT",
// dataType: "String",
// value: new opcua.Variant({dataType: opcua.DataType.String, value: "001,41,54,87,23,12/3/2016,8:39am"})
// });
var csvFile = addressSpace.addVariable({
componentOf: device,
nodeId: "ns=1;s=CSV",
browseName: "csvData",
dataType: "String",
value: new opcua.Variant({dataType: opcua.DataType.String, value: array[variable1]})
});
// fs.createReadStream('1000data.csv')
// .pipe(csv())
// .on('data', function(data){
// console.log("Data uploaded");
// })
// .on('end', function(date) {
// console.log("Read Finish");
// });
//look at this if you want to send data from client to server
// add a variable named MyVariable2 to the newly created folder "MyDevice"
var variable2 = 10.0;
server.engine.addressSpace.addVariable({
componentOf: device,
nodeId: "ns=2000;b=1020FFAA", // some opaque NodeId in namespace 4
browseName: "MyVariable2",
dataType: "Double",
value: {
get: function () {
return new opcua.Variant({dataType: opcua.DataType.Double, value: variable2 });
},
set: function (variant) {
variable2 = parseFloat(variant.value);
return opcua.StatusCodes.Good;
}
}
});
var os = require("os");
/**
* returns the percentage of free memory on the running machine
* @return {double}
*/
function available_memory() {
if (currentCount < array.length-1){
currentCount += 1 ;
console.log(array[currentCount]);
return currentCount;
} else {
console.log(array[0]);
return 0;
}
}
server.engine.addressSpace.addVariable({
componentOf: device,
nodeId: "ns=2000;s=TEST", // a string nodeID
browseName: "FreeMemory",
dataType: "String",
value: {
get: function () {return new opcua.Variant({dataType: opcua.DataType.String, value: array[available_memory()] });}
}
});
}
construct_my_address_space(server);
server.start(function() {
console.log("Server is now listening ... ( press CTRL+C to stop)");
console.log("port ", server.endpoints[0].port);
var endpointUrl = server.endpoints[0].endpointDescriptions()[0].endpointUrl;
console.log(" the primary server endpoint url is ", endpointUrl );
});
}
server.initialize(post_initialize);这是我的1000data.csv
Machine Unit,Air Temperature,Water Temperature,Heat Temperature,Room Temperature,Date,Time
1,61,54,87,24,12/3/2016,8:39AM
2,41,57,92,23,29/9/2016,3:51PM
3,39,53,89,25,22/12/2016,5:30PM