【发布时间】：2015-05-14 22:18:53
【问题描述】：
我正在为我之前的帖子寻找解决方案：Mongo gives duplicate key error on _id_ field in Meteor application
为了做到这一点，我想在服务器端从我的 CSV 文件中读取数据，而不是从客户端读取数据。
首先我尝试了这篇帖子Using node-csv and meteor-file to import CSV into a collection 中的解决方案，但meteor-file 与当前版本的Meteor 不再兼容。我也在这篇帖子Upload Data to Meteor / Mongo DB 中尝试了解决方案，但它也在客户端上，并且该解决方案会产生与我之前帖子中相同的错误。
经过进一步研究，我尝试使用以下代码读取数据。但是它不起作用：
首先我创建了一个集合：
Meteor.orders = new Meteor.Collection('Orders');
我定义了以下模板来读取 csv 文件：
<template name="read_file_orders">
<form class="well form-inline">
<label class="control-label" for="fileInput2">Kies bestand</label>
<input class="input-file" id="fileInput2" type="file" name="files[]">
<Button class="btn btn-primary" id="read_orders">Importeer</button>
<button class="btn btn-danger" id="erase_orders">Wis gegevens</button>
</form>
</template>
这是客户端javascript：
Template.read_file_orders.events({
"click #read_orders" : function(e) {
var f = document.getElementById('fileInput2').files[0];
console.log("read file");
readFile(f, function(content) {
Meteor.call('upload',content);
});
}
});
readFile = function(f,onLoadCallback) {
var reader = new FileReader();
reader.onload = function (e){
var contents=e.target.result
onLoadCallback(contents);
}
reader.readAsText(f);
};
这是服务器javascript：
Meteor.startup(function () {
// code to run on server at startup
return Meteor.methods({
upload : function(fileContent) {
console.log("start insert");
import_file_orders(fileContent);
console.log("completed");
}
});
});
import_file_orders = function(file) {
var lines = file.split('%\r\n');
var l = lines.length - 1;
for (var i=0; i < l; i++) {
var line = lines[i];
var line_parts = line.split('|');
var ex_key = line_parts[0];
var ex_name = line_parts[1];
var clin_info = line_parts[2];
var order_info = line_parts[3];
var clinician_last_name = line_parts[4];
var clinician_first_name = line_parts[5];
var clinician_code = line_parts[6];
var clinician_riziv = line_parts[7]
var pat_id = line_parts[8];
Meteor.orders.insert({Patient:pat_id, Exam_code:ex_key, Exam_name:ex_name, Clinical_info:clin_info, Order_info:order_info, Clinician_first:clinician_first_name, Clinician_last:clinician_last_name, Clinician_c_code:clinician_code, Clinician_riziv:clinician_riziv, Planned:null});
console.log("%");
};
当我尝试读取文件时，没有任何反应。服务器控制台中仅显示控制台日志，但没有导入任何内容。甚至没有创建 Orders 集合。
很明显我做错了什么，但我不知道到底是什么。但是我认为解决方案还不算太远。也许你们中的某个人可以告诉我正确的方向？
亲切的问候
编辑：
为了 revmen 的回答，这里是我的 testapp 的完整代码：
test.html:
<head>
<title>test</title>
</head>
<body>
<h1>Welcome to Meteor!</h1>
{{> read_file_orders}}
</body>
<template name="read_file_orders">
<form class="well form-inline">
<label class="control-label" for="fileInput2">Kies bestand</label>
<input class="input-file" id="fileInput2" type="file" name="files[]">
<Button class="btn btn-primary" id="read_orders">Importeer</button>
<button class="btn btn-danger" id="erase_orders">Wis gegevens</button>
</form>
</template>
test.js
Orders = new Mongo.Collection("orders");
if (Meteor.isClient) {
// counter starts at 0
Template.read_file_orders.events({
"click #read_orders" : function(e) {
var f = document.getElementById('fileInput2').files[0];
console.log("read file");
readFile(f, function(content) {
Meteor.call('upload',content);
});
}
});
import_file_orders = function(file) {
console.log("enter function import_file_orders")
var lines = file.split(/\r\n|\n/);
var l = lines.length - 1;
for (var i=0; i < l; i++) {
var line = lines[i];
var line_parts = line.split(',');
var ex_key = line_parts[0];
var ex_name = line_parts[1];
var clin_info = line_parts[2];
var order_info = line_parts[3];
var clinician_last_name = line_parts[4];
var clinician_first_name = line_parts[5];
var clinician_code = line_parts[6];
var clinician_riziv = line_parts[7]
var pat_id = line_parts[8];
var result = Orders.insert({Patient:pat_id, Exam_code:ex_key, Exam_name:ex_name, Clinical_info:clin_info, Order_info:order_info, Clinician:{first:clinician_first_name, last:clinician_last_name, c_code:clinician_code, riziv:clinician_riziv}, Planned:null});
console.log(Orders.findOne(result));
};
}
readFile = function(f,onLoadCallback) {
//When the file is loaded the callback is called with the contents as a string
var reader = new FileReader();
reader.onload = function (e){
var contents=e.target.result
onLoadCallback(contents);
}
reader.readAsText(f);
};
}
if (Meteor.isServer) {
Meteor.startup(function () {
// code to run on server at startup
});
Meteor.methods({
upload : function(fileContent) {
console.log("start insert");
import_file_orders(fileContent);
console.log("completed");
}
});
}
【问题讨论】：
-
我正在使用相同的代码，但不幸的是，我在 reader.readAsText(f); 处收到了非人类可读的文本；有什么办法解析吗？
标签： javascript mongodb csv meteor