Ionic 2 SqlStorage transactions, how to use?

@luchillo17 wrote:

Hi, i need to be able to make queries inside transactions, i have inspected the source code for SqlStorage but as far as i see i have to use the tx returned from a query to make the next one, does it work like that?

If it does i want to avoid that as it will lead to a lot of nesting when more than a few queries with transaction is needed, i did one when i was using ionic 1 but idk if it will work in ionic 2, i need to input a tx variable containig the transaction to the function queryTx and then i can use it inside queryAll, will it work?, i've commented the try with Promise.all() and put a workaround:

UPDATE: Found the issue, i leave the code for posterity

import {Injectable} from 'angular2/angular2';
import {Http} from 'angular2/http';
import {Storage, SqlStorage, IonicPlatform} from 'ionic/ionic';

@Injectable()
export class DB {
  constructor(http: Http) {
    this.db = new Storage(SqlStorage, {name: 'thadatabase'});
    this.http = http;
    this.data = null;
    this.self_class = this;
  }


getDB() {
    return this.db;
}
query(sql, args) {
    this.db.query(sql, args);
}
queryTx(tx, query, bindings) {
  return new Promise((resolve, reject) => {
    var self_class = this;
    tx.executeSql(query, bindings,
      (tx, success) => {
        resolve(self_class.fetchAll(success));
      },
      (tx, error) => {
        reject(error);
      }
    );
  });
}

queryAll(SQL) {
  return new Promise((resolve, reject) => {
    var promises = [];
    var self_class = this;
    this.getDB().transaction(function(tx) {
      for (var i = 0; i < SQL.query.length; i++) {
        promises.push(
          self_class.queryTx(tx, SQL.query[i], SQL.args[i])
        );
      }
      return Promise.all(promises).then(function(success) {
        resolve(success);
      }, function(err) {
        reject(err);
      });
    });
  });
};

fetch (result) {
  if (result.rows.length <= 0) return false;
  return result.rows.item(0);
};

fetchAll (result) {
  var output = [];
  for (var i = 0; i < result.rows.length; i++) {
    output.push(result.rows.item(i));
  }
  return output;
};

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