我一直在使用 ionic 2 native sqlite plugin制作一个基本的应用程序来捕获图像并将其存储到手机本地存储中。当我在 genymotion 模拟器上运行应用程序时，有时会不断收到未捕获的异常错误(似乎来自 sql 插件)。
当我使用 -live 参数(ionic run android -c -l)重新加载应用程序时，通常会发生这种情况。 我还注意到存储在应用程序上的数据没有出现(这再次表明在“实时重新加载”时加载存储的数据存在一些问题) 我把我得到的错误放在下面的控制台上:
控制台错误消息
[13:28:27] Starting 'html'...
[13:28:27] Finished 'html' after 42 ms
HTML changed: www/build/pages/home/home.html
HTML changed: www/build/pages/map-detail-component/map-detail-component.html
HTML changed: www/build/pages/map-page/map-page.html
0 298305 log Angular 2 is running in the development mode. Call enableProdMode() to enable the production mode.
1 298474 group EXCEPTION: Error: Uncaught (in promise): ReferenceError: sqlitePlugin is not defined
2 298475 error EXCEPTION: Error: Uncaught (in promise): ReferenceError: sqlitePlugin is not defined
3 298476 error STACKTRACE:
4 298477 error Error: Uncaught (in promise): ReferenceError: sqlitePlugin is not defined
at resolvePromise (http://192.168.56.1:8100/build/js/zone.js:418:31)
at resolvePromise (http://192.168.56.1:8100/build/js/zone.js:403:17)
at http://192.168.56.1:8100/build/js/zone.js:451:17
at ZoneDelegate.invokeTask (http://192.168.56.1:8100/build/js/zone.js:225:37)
at Object.NgZoneImpl.inner.inner.fork.onInvokeTask (http://192.168.56.1:8100/build/js/app.bundle.js:37360:41)
at ZoneDelegate.invokeTask (http://192.168.56.1:8100/build/js/zone.js:224:42)
at Zone.runTask (http://192.168.56.1:8100/build/js/zone.js:125:47)
at drainMicroTaskQueue (http://192.168.56.1:8100/build/js/zone.js:357:35)
at XMLHttpRequest.ZoneTask.invoke (http://192.168.56.1:8100/build/js/zone.js:297:25)
5 298478 groupEnd
6 298481 error Unhandled Promise rejection:, sqlitePlugin is not defined, ; Zone:, angular, ; Task:, Promise.then, ; Value:, [object Object], ReferenceError: sqlitePlugin is not defined
at http://192.168.56.1:8100/build/js/app.bundle.js:97420:13
at new ZoneAwarePromise (http://192.168.56.1:8100/build/js/zone.js:467:29)
at SQLite.openDatabase (http://192.168.56.1:8100/build/js/app.bundle.js:97419:16)
at new SqlService (http://192.168.56.1:8100/build/js/app.bundle.js:218:21)
at DebugAppView.Object.defineProperty.get (MyApp.template.js:18:67)
at DebugAppView._View_MyApp_Host0.injectorGetInternal (MyApp.template.js:35:79)
at DebugAppView.AppView.injectorGet (http://192.168.56.1:8100/build/js/app.bundle.js:31753:21)
at DebugAppView.injectorGet (http://192.168.56.1:8100/build/js/app.bundle.js:31945:49)
at ElementInjector.get (http://192.168.56.1:8100/build/js/app.bundle.js:31246:33)
at ElementInjector.get (http://192.168.56.1:8100/build/js/app.bundle.js:31249:48)
7 298519 log DEVICE READY FIRED AFTER, 1004, ms
8 298609 log Entering: map-page
9 298620 log ERROR: , {}
当我重新启动模拟器时，这会消失，但有时会在多次使用后再次出现。
我认为这可能是由于在导入插件之前创建了 SQLite 数据库，但我已将插件导入到我的根 app.ts 文件中(如下所示)(整个应用程序可以在此 github repo 中看到) )
根 app.ts
@Component({
template: '<ion-nav [root]="rootPage"></ion-nav>',
// Declare services
providers: [ SqlService ]
})
export class MyApp {
rootPage: any = MapPage;
constructor(platform: Platform) {
platform.ready().then(() => {
StatusBar.styleDefault();
});
}
}
ionicBootstrap(MyApp);
我已将插件的任何使用限制为 sqlService(如下所示)
SQL 服务
import { Injectable } from '@angular/core';
import 'rxjs/add/operator/map';
import { SQLite} from 'ionic-native';
@Injectable()
export class SqlService {
private db: SQLite;
private isOpen: boolean;
public constructor() {
if(!this.isOpen){
this.db = new SQLite();
this.db.openDatabase({
name: "data.db",
location: "default"
}).then(() => {
this.db.executeSql("CREATE TABLE IF NOT EXISTS places (id INTEGER PRIMARY KEY AUTOINCREMENT, title TEXT, img TEXT)", []).then((data) => {
console.log("TABLE CREATED: " + data);
}, (error) => {
console.log("Unable to execute SQL" + error);
});
this.isOpen=true;
});
}
}
public add(title: string, base64Img: string) {
return new Promise((resolve, reject) => {
this.db.executeSql("INSERT INTO places (title, img) VALUES ( '"+ title +"', '"+ base64Img +"')", [])
.then((data) => {
resolve(data);
}, (error) => {
reject(error);
});
});
}
// Remove individual Location
public remove(id: number){
return new Promise((resolve, reject) => {
this.db.executeSql("DELETE FROM places WHERE id = "+ id +";", [])
.then((data) => {
resolve(data);
}, (error) => {
reject(error);
});
});
}
public locDetail(id: number){
return new Promise((resolve, reject) => {
this.db.executeSql("SELECT * FROM places WHERE id = "+ id +";",[])
.then((data) => {
if(data.rows.length===1){
// console.log("ttitle: " + data.rows.item(0).title + " id: " + data.rows.item(0).id + " img: " + data.rows.item(0).img );
let place = [];
place.push({
id: data.rows.item(0).id,
title: data.rows.item(0).title,
img: data.rows.item(0).img
});
resolve(place);
}
}, (error) => {
reject(error);
});
});
}
// Refresh and initialise the places object
public refresh() {
return new Promise((resolve, reject) => {
this.db.executeSql("SELECT * FROM places", []).then((data) => {
let place = [];
if (data.rows.length > 0) {
for (var i = 0; i < data.rows.length; i++) {
place.push({
id: data.rows.item(i).id,
title: data.rows.item(i).title,
img: data.rows.item(i).img
});
}
}
resolve(place);
}, (error) => {
reject(error);
});
}
);
}
}
最佳答案
我最近遇到了同样的问题，请务必检查您的服务平台是否已准备就绪。从“ionic-angular”导入“Platform”并在 promise.then 方法中执行您的 sqlite 交互代码。
关于sqlite - ionic 2 错误 'ReferenceError: sqlitePlugin is not defined'，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/39547639/