TypeError：无法读取属性“openDatabase”未定义 [英] TypeError: Cannot read property 'openDatabase' of undefined

问题描述

我想第一次使用sqlite与cordova框架。我已经阅读了一个教程，我应该使用ngcordova像这样：

I want to work with sqlite with cordova framework for the first time. As I've read on a tutorial I should use ngcordova like this:

var db = null;
app.controller('mainCtrl', function ($scope, $ionicSideMenuDelegate) {
    $scope.toggleLeft = function () {
        $ionicSideMenuDelegate.toggleLeft();
    }
    $scope.toggleRight = function () {
        $ionicSideMenuDelegate.toggleRight();
    }
})
.controller('home_ctrl', function ($scope, $cordovaSQLite) {
    db = $cordovaSQLite.openDB({name: "my.db"});
        //db = $window.opendb({name: "my.db"});
        $cordovaSQLite.execute(db, "CREATE TABLE IF NOT EXISTS people(id integer primary key, firstname text, lastname text)")
})
;

当我运行此代码时出现错误：

When I run this code an error says:

TypeError: Cannot read property 'openDatabase' of undefined

在一些这样的文章：
建议使用如下命令： ionic start myApp sidemenu

我不知道是什么，我只是使用cordova命令像： cordova run android 或 cordova create my_project

我应该怎么做才能运行从cordova项目创建表格？

In some articles like this: How do I use the ngCordova sqlite service and the Cordova-SQLitePlugin with Ionic Framework? recommends to use commands like this: ionic start myApp sidemenu
I don't know what is it, I just use cordova command like: cordova run android or cordova create my_project
What should I do to run my create a table from my cordova project?

推荐答案

您可以参考本教程：

You might take a look at this tutorial:

https://www.thepolyglotdeveloper.com/2014/11/use-sqlite-instead-local-storage-ionic-framework/

当您看到此错误：

TypeError：无法读取属性openDatabaseundefined

TypeError: Cannot read property 'openDatabase' of undefined

这是由于以下原因之一：

It is happening for one of a few reasons:

1. 您不在 $ ionicPlatform.ready（）函数中包装 $ cordovaSQLite
   
2. 您尝试从网络浏览器测试此原生插件。


3. 您尚未在项目中实际安装基本SQLite插件。

1. You are not wrapping the $cordovaSQLite methods in the $ionicPlatform.ready() function.
2. You are trying to test this native plugin from a web browser.
3. You have not actually installed the base SQLite plugin into your project.

此错误的最常见原因是＃1和＃2。原生插件，必须在应用程序确认准备就绪后使用，因此 $ ionicPlatform.ready（）方法。由于本机插件使用本机代码，因此您无法通过Web浏览器测试它们。

The most common reasons for this error are #1 and #2. Native plugins, must be used only after the application is confirmed ready, thus the $ionicPlatform.ready() method. Since native plugins use native code, you cannot test them from your web browser.

阅读我链接的教程，因为它可以帮助您。

Read through the tutorial I linked because it should help you.

请注意，

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