node.js中各种类型的谷歌云数据存储查询

npm install @google-cloud/datastore

const {Datastore} = require('@google-cloud/datastore');
const datastore = new Datastore();

async function getEntity(kind, id) {
  const entityKey = datastore.key([kind, id]);
  const [entity] = await datastore.get(entityKey);
  return entity;
}

async function getEntities(kind, filters = []) {
  const query = datastore.createQuery(kind).filter(...filters);
  const [entities] = await datastore.runQuery(query);
  return entities;
}

async function getUsersByEmail(email) {
  const users = await getEntities('User', [
    datastore.filter('email', '=', email)
  ]);
  return users;
}

async function getUsersByAgeOrCountry(age, country) {
  const users = await getEntities('User', [
    datastore.or(
      datastore.filter('age', '=', age),
      datastore.filter('country', '=', country)
    )
  ]);
  return users;
}

async function getTopUsers(limit = 10) {
  const users = await getEntities('User', [], [
    datastore.order('score', { descending: true }),
    datastore.limit(limit)
  ]);
  return users;
}