在导航到另一个页面后，Ionic 3中的SQLite获取数据null

import { SQLite, SQLiteObject } from '@ionic-native/sqlite/ngx';

constructor(private sqlite: SQLite) {
  this.initializeDatabase();
}

initializeDatabase() {
  this.sqlite.create({
    name: 'data.db',
    location: 'default'
  }).then((db: SQLiteObject) => {
    this.db = db;
    // 创建表等初始化操作
  }).catch(e => console.log(e));
}

async getDataAndNavigate() {
  try {
    const data = await this.fetchData();
    if (data) {
      // 导航到另一个页面，并传递数据
      this.navCtrl.push(AnotherPage, { data: data });
    } else {
      console.log('No data found');
    }
  } catch (error) {
    console.error('Error fetching data', error);
  }
}

fetchData() {
  return new Promise((resolve, reject) => {
    this.db.executeSql('SELECT * FROM your_table', []).then((result) => {
      let data = [];
      if (result.rows.length > 0) {
        for (let i = 0; i < result.rows.length; i++) {
          data.push(result.rows.item(i));
        }
      }
      resolve(data);
    }).catch((error) => {
      reject(error);
    });
  });
}

ionViewDidEnter() {
  this.fetchData();
}

ionViewWillLeave() {
  // 可选：保存数据或进行清理操作
}