在离线模式下使用openerp

Question

我是初学者,很抱歉提出这个基本问题.

我们可以保存和检索自定义模块的数据,而openERP没有连接到服务器[离线模式].如果"是",则在创建自定义模块以便脱机工作时要遵循的步骤是什么.数据如何同步？如何在离线模式下连接openerp

[不关心离线数据存储限制]

Answer 1

你的问题不是那么基本。OpenERP 本身没有离线模式。但是 OpenERP 是开源且完全可扩展的，因此您可以自己完成。

您可以使用 HTML5 Web Storage来实现此类功能。它允许您将数据本地存储在网络浏览器中。您的实现将负责启动时的数据检索和数据同步。当然，您将面临一些限制，例如存储限制（取决于浏览器 - 例如 5MB 或 10MB）和性能问题。

OpenERP的销售点模块实现了这样的本地存储。我不确定它是否已被使用，但您可以使用它作为示例。您可能想在此处查看实现此模块的本地存储功能的 Javascript - db.js。

该模块可以作为离线实施的一个很好的例子。不过，该模块不再使用离线模式。db.js 文件开头的注释给出了一个很好的推理：

 /* The db module was intended to be used to store all the data needed to run the Point
 * of Sale in offline mode. (Products, Categories, Orders, ...) It would also use WebSQL
 * or IndexedDB to make the searching and sorting products faster. It turned out not to be
 * a so good idea after all.
  *
 * First it is difficult to make the Point of Sale truly independant of the server. A lot
 * of functionality cannot realistically run offline, like generating invoices.
 *
 * IndexedDB turned out to be complicated and slow as hell, and loading all the data at the
 * start made the point of sale take forever to load over small connections.
 *
 * LocalStorage has a hard 5.0MB on chrome. For those kind of sizes, it is just better
 * to put the data in memory and it's not too big to download each time you launch the PoS.
  *
 * So at this point we are dropping the support for offline mode, and this module doesn't really
 * make sense anymore. But if at some point you want to store millions of products and if at
 * that point indexedDB has improved to the point it is usable, you can just implement this API.
 *
 * You would also need to change the way the models are loaded at the start to not reload all your
 * product data.
 */