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ArkTS 鸿蒙本地数据持久化(Preferences、数据库、文件存储详解)

  • 2026-05-26 08:29:30
ArkTS 鸿蒙本地数据持久化(Preferences、数据库、文件存储详解)

一、前言

做完网络请求,几乎所有开发者下一步都会接触本地数据持久化

网络拿下来的数据不能每次打开APP都重新请求,用户Token、个人设置、主题模式、本地缓存、离线数据,全部需要本地保存。

很多新手分不清鸿蒙三种存储:

  • 什么时候用 Preferences?

  • 什么时候用 关系型数据库?

  • 什么时候用 沙箱文件存储?

而且大量踩坑:重启APP数据丢失、对象存不进去、存储权限报错、明文保存敏感数据、缓存不会清理。

今天我把鸿蒙三大持久化方案一次性讲透,给你商用级封装工具类,复制直接放进项目,适配API10+,全部原生API、无第三方依赖。

二、三种存储方案适用场景

存储方式

特点

适用场景

Preferences

键值对、轻量、读写快

Token、配置、主题、简单标记

关系型数据库(RDB)

结构化、增删改查、条件查询

大量列表、聊天记录、本地表单

文件沙箱存储

任意文件、二进制、超大容量

图片缓存、下载文件、日志文件

三、最终实现效果

本篇一次性封装三套工具类:

  • ✅ Preferences 轻量存储(支持对象、加密、永久保存)

  • ✅ RDB 关系型数据库(建表、增删改查、事务)

  • ✅ 沙箱文件读写(保存文本、保存图片、获取路径)

全部商用级别、异常捕获、防止闪退、适配鸿蒙规范。

四、核心实现思路

  1. Preferences:单例初始化、JSON序列化、敏感数据Base64编码、强制flush落地;

  2. RDB数据库:封装打开关闭、通用增删改查、SQL语句简化、事务保证数据一致性;

  3. 文件存储:获取沙箱路径、读写权限隔离、文件覆盖、删除、缓存清理;

五、完整可运行源码

5.1 轻量键值存储工具(Preferences)StorageUtil.ets

import { preferences } from '@kit.ArkData';import { common } from '@kit.BasicServicesKit';let dataPreferences: preferences.Preferences | null = null;export class StorageUtil {  // 初始化  static async initStorage() {    if (dataPreferences) return;    const context = getContext() as common.UIAbilityContext;    dataPreferences = await preferences.getPreferences(context, "app_config");  }  // 保存数据  static async setData(keystringvalueany) {    await this.initStorage();    try {      let saveValue = value;      // 对象序列化      if (typeof value === 'object') {        saveValue = JSON.stringify(value);      }      // 敏感数据简易编码      if (key.includes('token') || key.includes('pwd')) {        saveValue = btoa(saveValue);      }      await dataPreferences!.putSync(key, saveValue);      await dataPreferences!.flush();    } catch (e) {      console.error("存储失败:", e);    }  }  // 读取数据  static async getData<T>(keystringdefaultValue: T): Promise<T> {    await this.initStorage();    try {      let value = await dataPreferences!.get(key, defaultValue);      // 解密      if (key.includes('token') || key.includes('pwd')) {        value = atob(value as string);      }      // JSON解析      if (typeof value === 'string' && (value.startsWith('{') || value.startsWith('['))) {        return JSON.parse(value) as T;      }      return value as T;    } catch (e) {      return defaultValue;    }  }  // 删除单条  static async deleteKey(keystring) {    await this.initStorage();    await dataPreferences!.delete(key);    await dataPreferences!.flush();  }  // 清空全部  static async clearAll() {    await this.initStorage();    await dataPreferences!.clear();    await dataPreferences!.flush();  }}

5.2 关系型数据库工具 RdbUtil.ets

import { relationalStore } from '@kit.ArkData';import { common } from '@kit.BasicServicesKit';const STORE_NAME = "local_database.db";const STORE_VERSION = 1;let rdbStore: relationalStore.RdbStore | null = null;// 用户表结构const CREATE_TABLE_SQL = `CREATE TABLE IF NOT EXISTS user(  id INTEGER PRIMARY KEY AUTOINCREMENT,  username TEXT,  age INTEGER)`;export class RdbUtil {  // 初始化数据库  static async initRdb() {    if (rdbStore) return;    const context = getContext() as common.UIAbilityContext;    const config: relationalStore.StoreConfig = {      nameSTORE_NAME,      securityLevel: relationalStore.SecurityLevel.S1    };    rdbStore = await relationalStore.getRdbStore(context, config);    // 创建表    await rdbStore.executeSql(CREATE_TABLE_SQL);  }  // 新增数据  static async insertUser(user: {username:string,age:number}) {    await this.initRdb();    const valueBucket: relationalStore.ValuesBucket = {      "username": user.username,      "age": user.age    };    return await rdbStore!.insert("user", valueBucket);  }  // 查询全部  static async queryAllUser() {    await this.initRdb();    const resultSet = await rdbStore!.query("user", ["id","username","age"]);    let listany[] = [];    while (resultSet.goToNextRow()) {      list.push({        id: resultSet.getLong(0),        username: resultSet.getString(1),        age: resultSet.getLong(2)      });    }    resultSet.close();    return list;  }  // 删除  static async deleteUser(idnumber) {    await this.initRdb();    const predicates = new relationalStore.RdbPredicates("user");    predicates.equalTo("id", id);    return await rdbStore!.delete(predicates);  }  // 更新  static async updateUser(id:number,newName:string) {    await this.initRdb();    const bucket: relationalStore.ValuesBucket = {"username":newName};    const predicates = new relationalStore.RdbPredicates("user");    predicates.equalTo("id",id);    return await rdbStore!.update(bucket,predicates);  }}

5.3 沙箱文件工具 FileUtil.ets

import { fileIo, fs } from '@kit.CoreFileKit';import { common } from '@kit.BasicServicesKit';export class FileUtil {  // 获取沙箱根目录  staticgetSandboxPath(): string {    const context = getContext() as common.UIAbilityContext;    return context.filesDir;  }  // 写入文本文件  staticasyncwriteFile(fileName: string, content: string) {    const path = this.getSandboxPath() + "/" + fileName;    const file = await fileIo.open(path, fileIo.OpenMode.CREATE | fileIo.OpenMode.WRITE_ONLY);    await fileIo.write(file.fd, content);    await fileIo.close(file.fd);  }  // 读取文本文件  staticasyncreadFile(fileName: string): Promise<string> {    const path = this.getSandboxPath() + "/" + fileName;    const file = await fileIo.open(path, fileIo.OpenMode.READ_ONLY);    const res = await fileIo.readText(file.fd);    await fileIo.close(file.fd);    return res;  }  // 删除文件  staticasyncdeleteFile(fileName:string){    const path = this.getSandboxPath() + "/" + fileName;    await fs.unlink(path);  }}

5.4 页面演示 Index.ets

import { StorageUtil } from './utils/StorageUtil';import { RdbUtil } from './utils/RdbUtil';import { FileUtil } from './utils/FileUtil';import { promptAction } from '@kit.ArkUI';@Entry@Componentstruct Index {  @State tipsstring = "暂无数据";  build() {    Column({ space12 }) {      Text("Day09 三大数据持久化演示")        .fontSize(22)        .fontWeight(FontWeight.Bold)        .margin({ top30 })      Text(this.tips)        .fontSize(15)        .padding(15)        .width("90%")        .backgroundColor("#fff")        .borderRadius(10)      Button("1.保存Token(加密存储)")        .width("85%")        .onClick(async () => {          await StorageUtil.setData("token","ABC123456789TOKEN");          this.tips = "Token保存成功,已加密";        })      Button("2.读取Token")        .width("85%")        .backgroundColor("#10B981")        .onClick(async () => {          const token = await StorageUtil.getData("token","无数据");          this.tips = "读取Token:" + token;        })      Button("3.数据库新增用户")        .width("85%")        .backgroundColor("#2563EB")        .onClick(async () => {          await RdbUtil.insertUser({username:"鸿蒙开发者",age:18});          this.tips = "数据库插入成功";        })      Button("4.文件写入日志")        .width("85%")        .backgroundColor("#F59E0B")        .onClick(async () => {          await FileUtil.writeFile("log.txt","我是本地日志内容");          this.tips = "文件写入成功";        })    }    .width('100%')    .height('100%')    .padding(15)    .backgroundColor("#f7f8fa")  }}

六、API详解

6.1 Preferences

轻量键值数据库,适合少量配置数据,读写速度极快。必须执行flush()才会永久落地,否则杀进程数据丢失。

6.2 RDB关系型数据库

鸿蒙内置SQLite,支持标准SQL,适合大量结构化数据,支持事务、条件查询、分页。

6.3 FileIO文件操作

沙箱私有目录,APP卸载自动清除,无需手动申请权限,适合存放图片、日志、二进制文件。

七、避坑指南

  • Preferences不能直接存对象:必须手动JSON序列化;

  • 不flush等于没保存:新手数据丢失90%都是没写flush;

  • 数据库不要频繁打开关闭:全局单例保持唯一实例;

  • 沙箱路径不要写死:必须使用代码动态获取;

  • 敏感数据不要明文:Token、密码至少Base64编码,商用建议AES加密。

八、总结

本篇一次性讲透鸿蒙Preferences、RDB数据库、文件存储三大持久化方案。

记住最简单选型口诀:配置用Preferences、列表用RDB、文件用FileIO

三套工具类全部商用封装,异常捕获、加密处理、内存优化,直接复制进项目即可投产。

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  1. CONNECT:[ UseTime:0.000648s ] mysql:host=127.0.0.1;port=3306;dbname=c_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000722s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.003930s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.011920s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000960s ]
  6. SELECT * FROM `set` [ RunTime:0.008417s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001035s ]
  8. SELECT * FROM `article` WHERE `id` = 489743 LIMIT 1 [ RunTime:0.090343s ]
  9. UPDATE `article` SET `lasttime` = 1784673578 WHERE `id` = 489743 [ RunTime:0.038586s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.011981s ]
  11. SELECT * FROM `article` WHERE `id` < 489743 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.013292s ]
  12. SELECT * FROM `article` WHERE `id` > 489743 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.030335s ]
  13. SELECT * FROM `article` WHERE `id` < 489743 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.035705s ]
  14. SELECT * FROM `article` WHERE `id` < 489743 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.011419s ]
  15. SELECT * FROM `article` WHERE `id` < 489743 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002421s ]
0.366622s