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数据备份系统概述
数据备份系统为用户提供了数据安全保护。在Cordova框架与OpenHarmony系统的结合下，我们需要实现一个完整的备份恢复系统，包括本地备份、云备份和恢复功能。
备份数据模型
javascript
class BackupData {
constructor() {
this.id = 'backup_' + Date.now();
this.createdDate = new Date();
this.plants = [];
this.categories = [];
this.tags = [];
this.records = {
watering: [],
fertilizing: [],
pruning: [],
repotting: [],
pestDisease: []
};
this.version = '1.0';
}
}
class BackupManager {
constructor() {
this.backups = [];
this.loadFromStorage();
}
createBackup() {
const backup = new BackupData();
backup.plants = JSON.parse(JSON.stringify(plants));
backup.categories = JSON.parse(JSON.stringify(categoryManager.categories));
backup.tags = JSON.parse(JSON.stringify(tagManager.tags));
backup.records.watering = JSON.parse(JSON.stringify(wateringManager.records));
backup.records.fertilizing = JSON.parse(JSON.stringify(fertilizingManager.records));
backup.records.pruning = JSON.parse(JSON.stringify(pruningManager.records));
backup.records.repotting = JSON.parse(JSON.stringify(repottingManager.records));
backup.records.pestDisease = JSON.parse(JSON.stringify(pestDiseaseManager.records));
this.backups.push(backup);
this.saveToStorage();
return backup;
}
restoreBackup(backupId) {
const backup = this.backups.find(b => b.id === backupId);
if (!backup) return false;
plants = JSON.parse(JSON.stringify(backup.plants));
categoryManager.categories = JSON.parse(JSON.stringify(backup.categories));
tagManager.tags = JSON.parse(JSON.stringify(backup.tags));
wateringManager.records = JSON.parse(JSON.stringify(backup.records.watering));
fertilizingManager.records = JSON.parse(JSON.stringify(backup.records.fertilizing));
pruningManager.records = JSON.parse(JSON.stringify(backup.records.pruning));
repottingManager.records = JSON.parse(JSON.stringify(backup.records.repotting));
pestDiseaseManager.records = JSON.parse(JSON.stringify(backup.records.pestDisease));
return true;
}
deleteBackup(backupId) {
this.backups = this.backups.filter(b => b.id !== backupId);
this.saveToStorage();
}
}这个备份数据模型定义了BackupData和BackupManager类。
与OpenHarmony的集成
javascript
function backupToLocalStorage() {
const backup = backupManager.createBackup();
cordova.exec(
function(result) {
console.log("本地备份已完成");
showToast('本地备份已完成');
},
function(error) {
console.error("备份失败:", error);
},
"FilePlugin",
"saveBackup",
[{
backupId: backup.id,
data: JSON.stringify(backup)
}]
);
}
function backupToCloud() {
const backup = backupManager.createBackup();
cordova.exec(
function(result) {
console.log("云备份已完成");
showToast('云备份已完成');
},
function(error) {
console.error("云备份失败:", error);
},
"CloudPlugin",
"uploadBackup",
[{
backupId: backup.id,
data: JSON.stringify(backup),
userId: getCurrentUserId()
}]
);
}
function restoreFromCloud() {
cordova.exec(
function(result) {
console.log("云备份已恢复");
backupManager.restoreBackup(result.backupId);
showToast('数据已恢复');
},
function(error) {
console.error("恢复失败:", error);
},
"CloudPlugin",
"downloadBackup",
[{
userId: getCurrentUserId()
}]
);
}这段代码展示了如何与OpenHarmony的文件和云服务集成。
备份管理页面
javascript
function renderBackupPage() {
const container = document.getElementById('page-container');
container.innerHTML = `
<div class="backup-page">
<h2>备份恢复</h2>
<div class="backup-actions">
<button onclick="backupToLocalStorage()">💾 本地备份</button>
<button onclick="backupToCloud()">☁️ 云备份</button>
<button onclick="restoreFromCloud()">☁️ 从云恢复</button>
</div>
</div>
`;
const backupsList = document.createElement('div');
backupsList.className = 'backups-list';
backupsList.innerHTML = '<h3>备份列表</h3>';
if (backupManager.backups.length === 0) {
backupsList.innerHTML += '<p class="empty-message">还没有备份</p>';
} else {
backupManager.backups.forEach(backup => {
const backupItem = document.createElement('div');
backupItem.className = 'backup-item';
const backupSize = (JSON.stringify(backup).length / 1024).toFixed(2);
backupItem.innerHTML = `
<div class="backup-info">
<p class="backup-date">${backup.createdDate.toLocaleString('zh-CN')}</p>
<p class="backup-size">大小: ${backupSize}KB</p>
<p class="backup-stats">
植物: ${backup.plants.length},
记录: ${Object.values(backup.records).reduce((sum, arr) => sum + arr.length, 0)}
</p>
</div>
<div class="backup-actions">
<button onclick="restoreBackup('${backup.id}')">恢复</button>
<button onclick="deleteBackup('${backup.id}')">删除</button>
</div>
`;
backupsList.appendChild(backupItem);
});
}
container.appendChild(backupsList);
}
function restoreBackup(backupId) {
if (confirm('确定要恢复此备份吗？当前数据将被覆盖。')) {
backupManager.restoreBackup(backupId);
showToast('数据已恢复');
renderBackupPage();
}
}
function deleteBackup(backupId) {
if (confirm('确定要删除此备份吗？')) {
backupManager.deleteBackup(backupId);
showToast('备份已删除');
renderBackupPage();
}
}这个函数创建备份管理页面。
自动备份
javascript
class AutoBackupScheduler {
constructor() {
this.backupInterval = 24 * 60 * 60 * 1000; // 每天备份一次
this.lastBackupDate = null;
}
startAutoBackup() {
setInterval(() => {
this.performAutoBackup();
}, this.backupInterval);
}
performAutoBackup() {
const backup = backupManager.createBackup();
// 保留最近7个备份
if (backupManager.backups.length > 7) {
backupManager.backups.shift();
}
this.lastBackupDate = new Date();
console.log('自动备份已完成');
}
}这个AutoBackupScheduler类实现了自动备份功能。
备份验证
javascript
class BackupValidator {
constructor() {
this.backupManager = backupManager;
}
validateBackup(backupId) {
const backup = this.backupManager.backups.find(b => b.id === backupId);
if (!backup) return false;
// 检查必要的数据
if (!backup.plants || !backup.records) return false;
// 检查版本兼容性
if (backup.version !== '1.0') return false;
return true;
}
getBackupInfo(backupId) {
const backup = this.backupManager.backups.find(b => b.id === backupId);
if (!backup) return null;
return {
id: backup.id,
createdDate: backup.createdDate,
plantCount: backup.plants.length,
recordCount: Object.values(backup.records).reduce((sum, arr) => sum + arr.length, 0),
size: (JSON.stringify(backup).length / 1024).toFixed(2),
isValid: this.validateBackup(backupId)
};
}
}这个BackupValidator类提供了备份验证功能。
总结
数据备份恢复系统为用户提供了数据安全保护。通过本地备份、云备份和自动备份功能，我们可以确保用户的数据不会丢失。
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