Monitor the changes in EOImpl.java side

原创于 2016-03-16 10:11:53 发布 · 597 阅读

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本文介绍如何在特定框架中覆写doDML方法来获取数据更改前后的内容。通过覆写此方法，可以捕获订单ID变更的情况，并根据需要采取相应措施。最后调用super.doDML()确保其他业务逻辑正常执行。

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You can override the doDML method and get the changes before call super.doDML();
Code with example:

    @Override
   protected void doDML(int operation, TransactionEvent event) {
     if (operation == DML_UPDATE) {
        final String ORDER_ID = "OrderId";
        // get posted value of OrderId attribute
        // this method is to get the old value before change
        Object oldOrderId = getPostedAttribute(this.getAttributeIndexOf(ORDER_ID));
        // get value of OrderId after change
        Object newOrderId = this.getAttribute(ORDER_ID);
        // compare and take some action based on the results of comparison
        if (newOrderId != null && newOrderId.equals(oldOrderId)) {
          //do sth. here
          //System.out.println("Order Id changed from " + oldOrdreId + " to " + newOrderId);
        }
        // finally calling super.doDML()
        super.doDML(operation, event);
      }
    }