如何将数据传递到我的SQLite-Database中

问题描述

你好:)我对编程很新，最近我开始使用IONIC App。但是我卡住了。我想做一些电话簿，你可以随机获得JSON联系人并将它们保存到你的sqlite数据库。

Hello there :) I am pretty new to programming and I recently started an IONIC App. However I got stuck. I want to do something like a phone book where you can get random JSON contacts and save them to your sqlite database.

我得到了这个：

import { Storage ] from '@ionic/storage';
    @component({
        selector: 'page-home'
        templateUrl: 'home.html'
});

export class HomePage {

  posts: any;
  persons: any;

constructor(public navCtrl: NavController, public http: Http, public storage: Storage) {

  this.http.get('https://jsonplaceholder.typicode.com/users').map(res=> res.json()).subscribe(data => {
  this.posts = data;
 });

}

//here i would like to recieve the data from the tapped Item

  setData(){
    console.log();
        this.storage.set('myData', this.posts);
        console.log(this.posts);
  };


  getData(){
     this.storage.get('myData').then((data) => {
       if (data !=null){
         console.log(data);
       }
    })
  };
}

以下是查看：
当我点击/点按保存时-button我想将值存储在我的sqlite数据库中，并将其显示在我的本地联系人中。

Here is the View:When i click / tap the save-button i would like to store the values in my sqlite-database and display them in my "local contacts".

<ion-content>
        <ion-list>
            <ion-item *ngFor="let post of posts">
                <ion-list>
                    <ul><h1>{{post.name}}</h1></ul>
                    <ul><p>{{post.username}}, {{post.email}}</p></ul>
                    <ul><p>phone: {{post.phone}}</p></ul>
                    <button ion-button (click)="setData()">Set Data</button>
                </ion-list>
            </ion-item>
        </ion-list>
    </ion-content>

也许有人遇到类似的问题，可以帮助我解决这个问题。
谢谢:)

Maybe someone faced similar problems and can help me with this.Thanks :)

推荐答案

使用Ionic处理持久存储的最佳方法是使用。

The best way to handle persistent storage with Ionic is using ionic-storage.

Ionic Storage是由离子团队创建和维护的软件包，用于从每个浏览器或平台的细节中抽象开发，并自动使用最佳的存储解决方案。

Ionic Storage is a package created and maintained by the ionic team to abstract development from the specifics of each browser or platform and automatically use the best storage solution available.

在SQLite的情况下，您需要先安装Angular和Cordova的依赖项：

In your case for SQLite you need to first install the dependencies for both Angular and Cordova:

npm install @ ionic / storage --save

和

cordova插件添加cordova-sqlite-storage --save

然后在<$中编辑你的NgModule声明c $ c> src / app / app.module.ts 添加 IonicStorageModule 作为导入：

import { IonicStorageModule } from '@ionic/storage';

@NgModule({
  declarations: [...],
  imports: [
    IonicModule.forRoot(MyApp),
    IonicStorageModule.forRoot({
      name: '__mydb',
      driverOrder: ['indexeddb', 'sqlite', 'websql'],
    })
  ],
  bootstrap: [...],
  entryComponents: [...],
  providers: [...],
})
export class AppModule { }

import { Component } from '@angular/core';
import { Storage } from '@ionic/storage';

@Component({
  selector: 'page-home',
  templateUrl: 'home.html'
})
export class HomePage {
  constructor(public storage: Storage) {}
}

每当您访问存储时，请确保始终将代码包装在以下内容中：

Whenever you access storage, make sure to always wrap your code in the following:

storage.ready().then(() => { /* code here safely */});

3.1保存键值对

3.1 Saving a key-value pair

storage.ready().then(() => {
    storage.set('some key', 'some value');
});

3.2检索值

3.2 Retrieving a value

storage.ready().then(() => {
  storage.get('age').then((val: string) => {
      console.log('Your age is', val);
  });
});

3.3删除键值对

3.3 Deleting a key-value pair

storage.ready().then(() => {
    storage.remove('key').then((key: string) => { /* do something after deletion */})
});

这篇关于如何将数据传递到我的SQLite-Database中的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！