GitHub user dosubot[bot] edited a comment on the discussion: 关于电网拓扑数据导入

<!-- Answer -->
你的理解是对的,struct.json 里所有 "edges" 的 path 字段都可以指向同一个 edge_connected_to.csv 文件,只要 
field_mapping、source、target 配置和顶点主键字段一致即可。每个 edgeLabel 的配置会从这个文件读取数据,通过 
value_mapping 或 selected 过滤出当前 edgeLabel 需要的边类型,无需拆分多个 CSV 文件,官方文档和社区案例都推荐这种做法 
[参考](https://github.com/apache/incubator-hugegraph-doc/blob/master/content/cn/docs/quickstart/toolchain/hugegraph-loader.md)
 [案例](https://github.com/apache/incubator-hugegraph/issues/2749)。

举例:假设 edge_connected_to.csv 结构如下:

```
id,from,to,label
edge_1,BDZ-3002,XLD-3445,CONNECTED_TO
edge_2,XLD-3445,HWX-3087,CONNECTED_TO
...
```

struct.json 里可以这样写(以 LineSegment2LineSegment 为例):

```json
{
  "label": "LineSegment2LineSegment",
  "source": ["from"],
  "target": ["to"],
  "input": {
    "type": "file",
    "path": "/loader/power_data/edge_connected_to.csv",
    "format": "CSV",
    "header": ["id", "from", "to", "label"]
  },
  "field_mapping": {
    "from": "id",
    "to": "id"
  },
  "selected": ["from", "to"],
  "value_mapping": {
    "label": {
      "CONNECTED_TO": "LineSegment2LineSegment"
    }
  }
}
```

如果你有多个 edgeLabel(比如 Substation2LineSegment、LineSegment2StationHouse 等),每个 
edgeLabel 都写一段类似配置,path 都指向同一个 CSV 文件,只需用 value_mapping 或 selected 过滤出对应类型的边即可。

注意事项:
- field_mapping 的 from/to 要和顶点主键字段一致(比如都是 id)。
- value_mapping 里的 "label" 字段要和 CSV 里的 label 列内容对应。
- 如果 CSV 没有区分类型的字段,建议加一列 type 或 label,便于后续扩展和维护。
- 如果只用一个 edgeLabel(比如 CONNECTED_TO),那只需配置一次即可。

如需具体 struct.json 配置模板或遇到导入问题,可以把你的 struct.json 发出来,我可以帮你检查。


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GitHub link: 
https://github.com/apache/hugegraph/discussions/2917#discussioncomment-15193586

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