如何在离子2中使用lokijs-cordova-fs-adapter [英] how to use lokijs-cordova-fs-adapter in ionic 2

问题描述

我正在尝试在我的离子2应用程序中使用lokijs。我可以使用lokijs.js。
当试图坚持使用适配器时，我无法做到。我准备好了lokijs-cordova-fs-adapter可以使用。但是当我在我的应用程序中引用它时如下：得到一个无法找到它的错误。

I am trying to use lokijs in my ionic 2 app. i am able to use lokijs.js. when trying to persist using adapter i am not able to. i ready lokijs-cordova-fs-adapter can be used. but when i refer it in my app as below: getting an error that its not able to locate.

var LokiCordovaFSAdapter = require("./cordova-file-system-adapter");

尝试在我的index.html中添加它并尝试在我的ts文件中创建适配器，如下所示：

tried adding it in my index.html and tried creating adapter in my ts file as below:

var adapter = new LokiCordovaFSAdapter({"prefix": "loki"});

在这种情况下出现语法错误。有人可以给出一个如何使用它的例子吗？

getting syntax error in this case. can someone give an example on how to use it?

推荐答案

Ciao，这适用于Ionic 2，所以一步一步（我在服务中进行了此操作）：

Ciao, this works on Ionic 2, so step-by-step (I did this inside a service):

1. 检查是否安装了两个依赖项：

1. Check if both dependencies are installed:

npm install lokijs --save
npm install loki-cordova-fs-adapter --save

声明并导入以下内容（在类声明之前）：

Declare and import the following (before the class declaration):

declare var require: any;
var loki = require('lokijs');
var LokiCordovaFSAdapter = require("loki-cordova-fs-adapter");
var adapter = new LokiCordovaFSAdapter({"prefix": "loki"});

在服务类中使用以下内容：

Use the following inside the service class:

db: any; // LokiJS database
pandas: any; // our DB's document collection object

constructor() {
  console.log("* inicializando...");

  this.db = new loki('pandas.db', {
    autoload: true,
    autoloadCallback: function() {
      console.log("* database loaded...")
    },
    autosave: true,
    autosaveInterval: 10 * 1000, //every 10 seconds
    adapter: adapter
  });
}

使用它（此代码也在服务类中）：

Use it (this code is also inside the service class):

load() {
  let collection = this.db.getCollection('pandas');
  if (collection == null) {
    this.pandas = this.db.addCollection('pandas');
  } else {
    this.pandas = collection;
  }
}

pandaKamasutra() {
  console.log("* Save the pandas...");
  for (let i=0; i < 100; i++)
    this.pandas.insert({ name: 'Panda ' + (i+1), surename: "Whurgh " + i });
}

showPandas() {
  var results = this.pandas.find({});
  for (let r of results)
    console.log(`% id: ${r.$loki}, Panda: ${r.name}`);
}

我今天下午度过解决了这个问题，在游过LokiJS和lokijs-cordova-fs适配器代码后，我发现了Ionic文档中的光这里。

I spent this afternoon solving this, after swimming around both LokiJS and lokijs-cordova-fs-adapter code, I found the 'light' in the Ionic documentation here.

希望它也适合你。 =]

Hope it works for you too. =]

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