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65 lines
2.8 KiB
Markdown
65 lines
2.8 KiB
Markdown
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import Tabs from '@theme/Tabs';
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import TabItem from '@theme/TabItem';
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# But First, Semantics: Upsert versus Patch
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## Why Would You Use Patch
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By default, most of the SDK tutorials and API-s involve applying full upserts at the aspect level. This means that typically, when you want to change one field within an aspect without modifying others, you need to do a read-modify-write to not overwrite existing fields.
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To support these scenarios, DataHub supports PATCH based operations so that targeted changes to single fields or values within arrays of fields are possible without impacting other existing metadata.
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:::note
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Currently, PATCH support is only available for a selected set of aspects, so before pinning your hopes on using PATCH as a way to make modifications to aspect values, confirm whether your aspect supports PATCH semantics. The complete list of Aspects that are supported are maintained [here](https://github.com/datahub-project/datahub/blob/9588440549f3d99965085e97b214a7dabc181ed2/entity-registry/src/main/java/com/linkedin/metadata/models/registry/template/AspectTemplateEngine.java#L24). In the near future, we do have plans to automatically support PATCH semantics for aspects by default.
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:::
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## How To Use Patch
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Examples for using Patch are sprinkled throughout the API guides.
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Here's how to find the appropriate classes for the language for your choice.
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<Tabs>
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<TabItem value="Java" label="Java SDK">
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The Java Patch builders are aspect-oriented and located in the [datahub-client](https://github.com/datahub-project/datahub/tree/master/metadata-integration/java/datahub-client/src/main/java/datahub/client/patch) module under the `datahub.client.patch` namespace.
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Here are a few illustrative examples using the Java Patch builders:
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### Add Custom Properties
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```java
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{{ inline /metadata-integration/java/examples/src/main/java/io/datahubproject/examples/DatasetCustomPropertiesAdd.java show_path_as_comment }}
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```
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### Add and Remove Custom Properties
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```java
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{{ inline /metadata-integration/java/examples/src/main/java/io/datahubproject/examples/DatasetCustomPropertiesAddRemove.java show_path_as_comment }}
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```
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### Add Data Job Lineage
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```java
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{{ inline /metadata-integration/java/examples/src/main/java/io/datahubproject/examples/DataJobLineageAdd.java show_path_as_comment }}
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```
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</TabItem>
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<TabItem value="Python" label="Python SDK" default>
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The Python Patch builders are entity-oriented and located in the [metadata-ingestion](https://github.com/datahub-project/datahub/tree/9588440549f3d99965085e97b214a7dabc181ed2/metadata-ingestion/src/datahub/specific) module and located in the `datahub.specific` module.
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Here are a few illustrative examples using the Python Patch builders:
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### Add Properties to Dataset
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```python
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{{ inline /metadata-ingestion/examples/library/dataset_add_properties.py show_path_as_comment }}
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```
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</TabItem>
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</Tabs>
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