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，我想为我的Ionic应用程序使用不同的解决方案。 LokiJS经常被提及，所以我尝试了它。但也与LokiJS我没有运气。Ionic + LokiJS总是生成“ionic.bundle.js：26794 TypeError：在SQLite遇到所有问题后，无法读取未定义的属性”插入“
目前，我有一个非常基本的代码，这应该没有问题的工作：
.controller('ProjectsController', ['$scope', '$state', '$ionicPlatform', function($scope, $state, $ionicPlatform) {
var pcVm = this;
var db;
var projects1;
$ionicPlatform.ready(function(){
var idbAdapter = new LokiIndexedAdapter('loki');
db = new loki('lkr-v4', {
autoload: true,
autoloadCallback : getAllProjects,
autosave: true,
autosaveInterval: 10000,
adapter: idbAdapter
});
function getAllProjects() {
var options = {};
db.loadDatabase(options, function() {
projects1 = db.getCollection('projects'); // GET
if (!projects1) {
projects1 = db.addCollection('projects'); // ADD
}
console.log('Databaseinformation');
console.log(db);
console.log('Collectioninformation');
console.log(projects1);
});
}
console.log('Insert something');
projects1.insert({ name : 'odin' });
}); // End of .ready()
但我总是得到消息：
ionic.bundle.js:26794 TypeError: Cannot read property 'insert' of undefined
at controllers.js:309
at ionic.bundle.js:56230
at Object.ready (ionic.bundle.js:2140)
at Object.ready (ionic.bundle.js:56223)
at new <anonymous> (controllers.js:283)
at Object.instantiate (ionic.bundle.js:18010)
at $controller (ionic.bundle.js:23412)
at self.appendViewElement (ionic.bundle.js:59900)
at Object.render (ionic.bundle.js:57893)
at Object.init (ionic.bundle.js:57813)(anonymous function) @ ionic.bundle.js:26794(anonymous function) @ ionic.bundle.js:23507$broadcast @ ionic.bundle.js:30720$state.transition.resolved.then.$state.transition @ ionic.bundle.js:52157processQueue @ ionic.bundle.js:29127(anonymous function) @ ionic.bundle.js:29143$eval @ ionic.bundle.js:30395$digest @ ionic.bundle.js:30211$apply @ ionic.bundle.js:30503done @ ionic.bundle.js:24824completeRequest @ ionic.bundle.js:25022requestLoaded @ ionic.bundle.js:24963
controllers.js:301 Databaseinformation
请帮助。也许我有与SQLite和LokiJS相同的问题？但我找不到问题...
谢谢， 基督徒。
更新 - 2016年8月5日
于是，我又花了几个小时小时的搜索，尝试，始终与同样的错误结束了。我想知道为什么所有的教程看起来都是一样的，而且看起来可行，但对我来说，它不可能运行。
我完全重写我的工厂：我app.js.的
(function() {
'use strict';
angular.module('lkr-v4')
.factory('PersistenceService', ['$q', 'Loki', PersistenceService]);
function PersistenceService($q, Loki) {
// Needed variables
var lkrDb; // Database
var projects; // Collection of JSON strings
// Accessible Members Up Top
// https://github.com/johnpapa/angular-styleguide/tree/master/a1#style-y052
var pService = {
initDB: initDB,
getAllProjects: getAllProjects,
addProject: addProject,
updateProject: updateProject,
deleteProject: deleteProject
};
return pService;
// Initialization of the database
function initDB() {
var idbAdapter = new LokiIndexedAdapter('loki');
lkrDb = new loki('lkr-v4', {
autoload: true,
autoloadCallback: getAllProjects,
autosave: true,
autosaveInterval: 10000,
adapter: idbAdapter
});
}
// Function to return a collection of JSON strings (all found projects) in the LokiJS database file
function getAllProjects() {
// What is $q? See https://docs.angularjs.org/api/ng/service/$q
return $q(function (resolve, reject) {
var options = {};
lkrDb.loadDatabase(options, function() {
projects = lkrDb.getCollection('projects'); // GET!
// If the database file is empty
if (!projects) {
projects = lkrDb.addCollection('projects'); // ADD!
}
resolve(projects.data);
});
});
}
// Function to add a project
function addProject(project) {
if(lkrDebug) {
console.log('Inside of addProject from the factory');
console.log('This is the projects object');
console.log(this.projects);
console.log('This is the given value of the new project');
console.log(project);
}
projects.insert(project);
}
// Function to update a project
function updateProject(project) {
projects.update(project);
}
// Function to delete a project
function deleteProject(project) {
projects.remove(project);
}
} // End of function PersistenceService
})(); // End of IIFE
我所说的PersistenceService.initDB（）在run（）这工作！
我的所有页面（4）都有自己的控制器，用于控制器上。在我的第一页的控制器中，我试过这个代码：
// Test #1: Get data
PersistenceService.getAllProjects().then(function(projects) {
pcVm.projects = projects;
if(lkrDebug) {
console.log('Inside of getAllProjects().then() from the controller');
console.log('This is the project object from the PersistenceService');
console.log(projects);
console.log('And this ist the pcVm.projects object from the controller');
console.log(pcVm.projects);
}
});
它工作！我可以看到consloe中的正确信息，并且我没有发现任何错误。
下一个代码是直接的代码后在同一个控制器上面放置：
// Test #2: Add a project
PersistenceService.addProject({ name : 'odin' });
并可以产生控制台
Inside of addProject from the factory
persistence.services.js:65 This is the projects object
persistence.services.js:66 undefined
persistence.services.js:67 This is the given value of the new project
persistence.services.js:68 Object {name: "odin"}
ionic.bundle.js:26794 TypeError: Cannot read property 'insert' of undefined
at Object.addProject (persistence.services.js:70)
at new ProjectsController (projects.controller.js:31)
at Object.instantiate (ionic.bundle.js:18010)
at $controller (ionic.bundle.js:23412)
at self.appendViewElement (ionic.bundle.js:59900)
at Object.render (ionic.bundle.js:57893)
at Object.init (ionic.bundle.js:57813)
at self.render (ionic.bundle.js:59759)
at self.register (ionic.bundle.js:59717)
at updateView (ionic.bundle.js:65398)(anonymous function) @ ionic.bundle.js:26794(anonymous function) @ ionic.bundle.js:23507$broadcast @ ionic.bundle.js:30720$state.transition.resolved.then.$state.transition @ ionic.bundle.js:52157processQueue @ ionic.bundle.js:29127(anonymous function) @ ionic.bundle.js:29143$eval @ ionic.bundle.js:30395$digest @ ionic.bundle.js:30211$apply @ ionic.bundle.js:30503done @ ionic.bundle.js:24824completeRequest @ ionic.bundle.js:25022requestLoaded @ ionic.bundle.js:24963
projects.controller.js:22 Inside of getAllProjects().then() from the controller
projects.controller.js:23 This is the project object from the PersistenceService
projects.controller.js:24 [Object, Object, Object, Object, Object, Object, Object, Object, Object, Object, Object, Object, Object, Object, Object, Object, Object, Object, Object]
projects.controller.js:25 And this ist the pcVm.projects object from the controller
projects.controller.js:26 [Object, Object, Object, Object, Object, Object, Object, Object, Object, Object, Object, Object, Object, Object, Object, Object, Object, Object, Object]
这一点上下面的行（和误差修改）奇怪，因为对我来说，它看起来像addProject（）被称为bevore getAllProjects（）？
所以我添加了行console.log（lkrDb）;在addProject函数中，查看数据库是否被加载，并且我做了更多的测试。事实证明，app.js中的initDB正在工作，并且addProject函数也可以用于打开的数据库。
我的结论是，我在控制器或getAllProjects函数中做错了什么！？
我会继续搜索，但我对任何暗示真的心存感激......
感谢， 基督徒。
什么输出你从这一行'的console.log（projects1）;' – sawbeanraz