BulkLoader -export_transform

问题描述

我已经使用java创建了Web应用程序.我想从appengine数据仓库下载数据，以便使用BulkLoader概念.

I have created web application using java.I wantted to download data from appengine datastroe so that I am using BulkLoader concept.

在我的项目中，我按如下方式设计了实体

In my project I designed entity as follows

@Id

@GeneratedValue(strategy = GenerationType.IDENTITY)

private Long school_id;

@Basic

private String schoolname;

此后，我尝试下载数据，以便创建了bulkloader配置文件.它创建成功，但是默认情况下自动生成的bulkloade.yaml文件存在一个问题(iE)export-transform将主键转换为字符串，但是我需要长数据类型如何实现这一点.

After that I tried to download data so that I created bulkloader configuration file .It created successfully but I that default auto generated bulkloade.yaml file I have one problem(i.E)export-transform convert Primary key into string, but I need Long datatype how to achieve this.

bulkloader文件的内容为

The content of bulkloader file is

- kind: School

  connector: csv

  property_map:

    - property: __key__

      external_name: key

      export_transform: transform.key_id_or_name_as_string

    - property: schoolname

      external_name: schoolname

如何解决这个问题预先感谢

How to solve this Thanks in advance

推荐答案

尝试 export_transform:datastore.Key.name

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