在 Google Apps 脚本中使用缓存

Question

我一直在尝试在我的代码中使用缓存，但我不断收到以下错误：

ReferenceError: cache is not defined.

我已经尝试在文档和互联网上查看错误的含义，但我没有找到任何东西。

Answer 1

我玩了一下缓存服务。也许这会有所帮助。

function getMyData() {
  let cs=CacheService.getScriptCache();//select which cache
  let dt=JSON.parse(cs.get('mydata'));//parsing data back into object
  if(!dt) {//if no data in cache
    const ss=SpreadsheetApp.openById(gobj.globals.targetid);
    const sh=ss.getSheetByName(gobj.globals.targetsh);
    const vs=sh.getDataRange().getValues();
    cs.put('mydata',JSON.stringify(vs));//put data into cache
    dt=vs;//get data
    ss.toast('accessed cache');//just to let me know I accessed cache
  }
  return dt;
}

function displayMyData() {
  const ss=SpreadsheetApp.getActive();
  const sh=ss.getSheetByName('Sheet1');
  sh.clearContents();
  let dt=getMyData();//gets data from original source or cache if it's availiable
  sh.getRange(1,1,dt.length,dt[0].length).setValues(dt);
}

function flushcache() {
  let cs=CacheService.getScriptCache();
  cs.removeAll(['mydata']);
  const ss=SpreadsheetApp.getActive();
  const sh=ss.getSheetByName('Sheet1');
  sh.clearContents();
  ss.toast('flushed');
}

gobj.globals 只是我使用的全局变量

Answer 2

尝试实现以下代码：

const md5 = (key = '') => {
  const code = key.toLowerCase().replace(/\s/g, '');
  return Utilities.computeDigest(Utilities.DigestAlgorithm.MD5, key)
    .map((char) => (char + 256).toString(16).slice(-2))
    .join('');
};

const getProperty = (key) => {
  var scriptProperties = PropertiesService.getScriptProperties();
  return scriptProperties.getProperty(md5(key));
};

const setProperty = (key, value) => {
  var scriptProperties = PropertiesService.getScriptProperties();
  scriptProperties.setProperty(md5(key), value);
};

一旦在您的代码中实现这一点，您就可以使用getProperties 检索任何以前存储的结果。如下例所示：

const md5 = (key = '') => {
  const code = key.toLowerCase().replace(/\s/g, '');
  return Utilities.computeDigest(Utilities.DigestAlgorithm.MD5, key)
    .map((char) => (char + 256).toString(16).slice(-2))
    .join('');
};

const getProperty = (key) => {
  var scriptProperties = PropertiesService.getScriptProperties();
  return scriptProperties.getProperty(md5(key));
};

const setProperty = (key, value) => {
  var scriptProperties = PropertiesService.getScriptProperties();
  scriptProperties.setProperty(md5(key), value);
};

const GOOGLEMAPS_DISTANCE = (origin, destination, mode = 'driving') => {

  const key = ['distance', origin, destination, mode].join(',');
  // Is result in the internal cache?
  const value = getProperty(key);
  // If yes, serve the cached result
  if (value !== null) return value;
  const { routes: [data] = [] } = Maps.newDirectionFinder()
    .setOrigin(origin)
    .setDestination(destination)
    .setMode(mode)
    .getDirections();
  if (!data) {
    GOOGLEMAPS_DISTANCE;
  }
  const { legs: [{ distance: { text: distance } } = {}] = [] } = data;
  // Store the result in internal cache for future
  setProperty(key, distance);
  return distance;
};

在此示例中，使用 Properties 代替 Cache，因为它允许您无限期地存储数据，而 Cache 被限制为 6 小时。有关示例的更多信息，请参阅this 线程。

Documentation 为Properties

Documentation 为Cache