@notesnook/localforage-getitems/lib/getitems-websql.js

Adds getItems method to localForage.

import { getSerializerPromise } from "./utils";

export function getItemsWebsql(keys /*, callback*/) {
  var localforageInstance = this;
  var promise = new Promise(function(resolve, reject) {
    localforageInstance
      .ready()
      .then(function() {
        return getSerializerPromise(localforageInstance);
      })
      .then(function(serializer) {
        var dbInfo = localforageInstance._dbInfo;
        dbInfo.db.transaction(function(t) {
          var queryParts = new Array(keys.length);
          for (var i = 0, len = keys.length; i < len; i++) {
            queryParts[i] = "?";
          }

          t.executeSql(
            "SELECT * FROM " +
              dbInfo.storeName +
              " WHERE (key IN (" +
              queryParts.join(",") +
              "))",
            keys,
            function(t, results) {
              var result = [];

              var rows = results.rows;
              for (var i = 0, len = rows.length; i < len; i++) {
                var item = rows.item(i);
                var value = item.value;

                // Check to see if this is serialized content we need to
                // unpack.
                if (value) {
                  value = serializer.deserialize(value);
                }

                result.push([item.key, value]);
              }

              resolve(result);
            },
            function(t, error) {
              reject(error);
            }
          );
        });
      })
      .catch(reject);
  });
  return promise;
}