dosubot[bot] commented on issue #2551: URL: https://github.com/apache/incubator-hugegraph/issues/2551#issuecomment-2149265706
<!-- Answer --> `.ifNotExist()` 方法在创建顶点时没有效果，可能是因为在 `hugegraph.properties` 文件中配置了 `vertex.check_customized_id_exist` 选项。这个选项会在添加顶点之前检查是否存在具有相同自定义 ID 的顶点。如果存在相同 ID 的顶点，即使使用了 `.ifNotExist()`，也会抛出 `ExistedException` 异常 <sup>[[1]](https://github.com/apache/incubator-hugegraph/blob/master/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/backend/tx/GraphTransaction.java)</sup>. 你可以检查 `hugegraph.properties` 文件中的 `vertex.check_customized_id_exist` 配置项。如果该选项启用，可以尝试禁用它来避免此问题。 此外，确保在创建顶点之前手动检查顶点是否存在也是一种推荐的做法。这可以通过查询顶点来实现，以避免在插入时遇到冲突。 ```java // Example: Check if vertex exists before creating if (!vertexExists(value.getEdag())) { schema.vertexLabel(value.getEdag()) .properties("**") .primaryKeys(value.getEdag()) .ifNotExist() .create(); } private boolean vertexExists(String vertexId) { // Implement the logic to check if the vertex exists // This can be a query to the database to see if the vertex with the given ID exists } ``` 这种方法可以确保在创建顶点之前进行存在性检查，从而避免 `ExistedException` 异常。 <!-- Dosu Comment Footer --> *To continue talking to [Dosu](https://dosu.dev), mention @dosu.* -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
