HarmonyOS 鸿蒙Next 开发中首选项存储和关系型数据库会冲突吗

加入关系型数据库后，首选项存储的读取就出了问题，请问可能是什么原因呢。

import CommonConstants from '../common/constant/CommonConstants';
import StyleConstants from '../common/constant/StyleConstants';
import CommonUtils from '../common/utils/CommonUtils';
import MultipleDevicesUtils from '../common/utils/MultipleDevicesUtils';
import { router } from '@kit.ArkUI';
import PreferencesUtil from '../common/utils/PreferencesUtil'
import FontSave from '../viewmodel/FontSave'

@Entry
@Component
export struct LoginPage {
  @StorageProp('currentDeviceSize') currentDeviceSize: string = CommonConstants.SM;

  onPageShow() {
    MultipleDevicesUtils.register();
  }


  build() {
    GridRow({
      columns: {
        sm: StyleConstants.COLUMNS_SM,
        md: StyleConstants.COLUMNS_MD,
        lg: StyleConstants.COLUMNS_LG
      },
      gutter: {
        x: StyleConstants.GRID_GUTTER
      }
    }) {
      GridCol({
        span: {
          sm: StyleConstants.SPAN_SM,
          md: StyleConstants.SPAN_MD,
          lg: StyleConstants.SPAN_LG
        }, offset: {
          md: StyleConstants.OFFSET_MD,
          lg: StyleConstants.OFFSET_LG
        }
      }) {
        Column() {

          // Title component
          LoginTitle()
          // Bottom component
          LoginBottom()

        }
      }
    }
    .backgroundColor($r('app.color.background'))
  }
}

@Preview
@Component
struct LoginTitle {
  build() {
    Column() {
      Image($r('app.media.neu'))
        .width($r('app.float.logo_image_size'))
        .height($r('app.float.logo_image_size'))
        .margin({ bottom: $r('app.float.logo_margin_bottom') })
      Text('资源复用平台')
        .fontSize($r('app.float.common_text_size'))
        .fontWeight(FontWeight.Medium)
        .fontColor($r('app.color.title_text_color'))
      Text('精勤博学，学以致用。厚积薄发，智行天下')
        .fontSize($r('app.float.normal_text_size'))
        .fontColor($r('app.color.more_text_color'))
        .margin({
          top: $r('app.float.more_margin_top'),
          bottom: $r('app.float.more_margin_bottom')
        })
    }
    .backgroundColor($r('app.color.background'))
    .justifyContent(FlexAlign.Center)
    .width(StyleConstants.FULL_PARENT)
    .height(StyleConstants.LOGIN_LOGO_HEIGHT)
  }
}

@Preview
@Component
export struct LoginBottom {
  @State account: string = '';
  @State password: string = '';
  @State FontSaveData: FontSave = new FontSave();

  async aboutToAppear() {//首选项读取
    await PreferencesUtil.getPreferencesFromStorage();
    PreferencesUtil.getFontData().then((resultData: FontSave) => {
      if (resultData) {
        this.FontSaveData.account = resultData.account;
        console.debug('onPageShow: this.FontSaveData.account set to', this.FontSaveData.account);
        this.FontSaveData.password = resultData.password;
        console.debug('onPageShow: this.FontSaveData.password set to', this.FontSaveData.password);
      }
    });
  }

  build() {
      Column() {
        Column() {
          TextInput({ text: "houmingyang1122", placeholder: "用户名" })
            .maxLength(StyleConstants.INPUT_ACCOUNT_LENGTH)
            .type(InputType.Normal)
            .inputStyle()
            .onChange((value: string) => {
              this.account = value;
            })

          Line()
            .width(StyleConstants.FULL_PARENT)
            .height($r('app.float.line_height'))
            .margin({
              left: $r('app.float.line_margin_left'),
              right: $r('app.float.line_margin_right')
            })
            .backgroundColor($r('app.color.line_color'))

          TextInput({ text: "123456", placeholder: "密码" })
            .maxLength(StyleConstants.INPUT_PASSWORD_LENGTH)
            .type(InputType.Password)
            .inputStyle()
            .onChange((value: string) => {
              this.password = value;
            })
        }
        .backgroundColor(Color.White)
        .borderRadius($r('app.float.login_input_radius'))

        Row() {
          Text('自动登录')
            .blueTextStyle()
            .onClick(() => {
              if(this.FontSaveData.account ===''|| this.FontSaveData.password ===''){
                CommonUtils.showToastContent(this.FontSaveData.account);
                CommonUtils.showToastContent('账号或密码不能为空');
                return;
              }
              CommonUtils.loginArkTS(this.FontSaveData.account, this.FontSaveData.password)

            })
        }
        .justifyContent(FlexAlign.SpaceBetween)
        .width(StyleConstants.FULL_PARENT)
        .margin({ top: $r('app.float.forgot_margin_top') })
        .padding({
          left: $r('app.float.forgot_padding_left'),
          right: $r('app.float.forgot_padding_right')
        })

        Button('登录')
          .id(CommonConstants.LOGIN_BUTTON_ID)
          .width(StyleConstants.FULL_PARENT)
          .height($r('app.float.login_button_height'))
          .fontSize($r('app.float.normal_text_size'))
          .fontWeight(FontWeight.Medium)
          .backgroundColor($r('app.color.login_button_color'))
          .margin({
            top: $r('app.float.login_button_top'),
            bottom: $r('app.float.login_button_bottom')
          })
          .onClick(() => {
            if(this.account ===''|| this.password ===''){
              CommonUtils.showToastContent('账号或密码不能为空');
              return;
            }
            CommonUtils.loginArkTS(this.account, this.password)
            this.FontSaveData.account=this.account;
            this.FontSaveData.password=this.password;
            PreferencesUtil.putPreferencesValue(this.FontSaveData)
          })
        Text('注册')
          .fontColor($r('app.color.blue_text_color'))
          .fontSize($r('app.float.normal_text_size'))
          .fontWeight(FontWeight.Medium)
          .onClick(() => {

            router.pushUrl({
              url: 'pages/RegPage' // 目标url
            }, router.RouterMode.Standard, (err) => {
              if (err) {
                console.error(`Invoke pushUrl failed, code is ${err.code}, message is ${err.message}`);
                return;
              }
              console.info('Invoke pushUrl succeeded.');
            });
          })
      }
      .padding({
        left: $r('app.float.login_button_left'),
        right: $r('app.float.login_button_right'),
      })
      .backgroundColor($r('app.color.background'))
      .height(StyleConstants.LOGIN_BOTTOM_HEIGHT)
    }
}

@Extend(TextInput)
function inputStyle() {
  .placeholderColor($r('app.color.placeholder_color'))
  .height($r('app.float.login_input_height'))
  .fontSize($r('app.float.normal_text_size'))
  .backgroundColor(Color.White)
  .margin({ top: $r('app.float.input_margin_top') })
  .padding({ left: StyleConstants.INPUT_PADDING_LEFT })
}

@Extend(Text)
function blueTextStyle() {
  .fontColor($r('app.color.blue_text_color'))
  .fontSize($r('app.float.small_text_size'))
  .fontWeight(FontWeight.Medium)
}
import preferences from '@ohos.data.preferences'
import FontSave from '../../viewmodel/FontSave'
import Logger from './Logger';
import { promptAction } from '@kit.ArkUI';
const PREFERENCES_NAME='myPreferences'
const KEY_APP_Account_Save = 'appdata'

let context = getContext(this) as Context;

let preferenceFont: preferences.Preferences ;
class PreferencesUtil {
  private FontSaveData: FontSave = new FontSave();
  // 加载Preferences
  async getPreferencesFromStorage() {
    preferenceFont=await preferences.getPreferences(context,PREFERENCES_NAME)
  }

  // 放Preferences数据
  async putPreferencesValue(FontSave:FontSave) {
    if(preferenceFont!==null){
      await preferenceFont.put(KEY_APP_Account_Save,JSON.stringify(FontSave));
      await preferenceFont.flush();
    }
  }

  async getPreferences() {
    let FontSave = '';
    if (!preferenceFont) {
      await this.getPreferencesFromStorage();
    }
    if (preferenceFont !== null) {
      FontSave = (await preferenceFont.get(KEY_APP_Account_Save,'')).toString();
    }

    if (FontSave === '') {
      this.showToastMessage($r('app.string.data_is_null_msg'))
      return;
    }
    this.showToastMessage($r('app.string.read_success_msg'));
    return JSON.parse(FontSave);
  }
  async deletePreferences() {
    await preferences.deletePreferences(context,PREFERENCES_NAME)
  }
  async getFontData() {
    this.FontSaveData = await this.getPreferences();
    return this.FontSaveData;
  }

  checkFontData(FontSave: FontSave) {
    if (FontSave.FontSize === 0 || FontSave.FontRatio === 0) {
      this.showToastMessage($r('app.string.fruit_input_null_msg'));
      return true;
    }
    return false;
  }

  writeData(FontSave: FontSave) {
    // Check whether the data is null.
    let isDataNull = this.checkFontData(FontSave);
    if (isDataNull) {
      return;
    }
    // The data is inserted into the preferences database if it is not empty.
    this.putPreferencesValue(FontSave);
    this.showToastMessage($r('app.string.write_success_msg'));
  }
  showToastMessage(message: Resource) {
    promptAction.showToast({
      message: message,
      duration: 3000
    });
  };

}
export default new PreferencesUtil();