mirror of https://gitee.com/bigwinds/arangodb
23 lines
1.2 KiB
Markdown
23 lines
1.2 KiB
Markdown
Modification Queries
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====================
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{% hint 'warning' %}
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It is recommended to use AQL instead, see [**Data Modification Queries**](../../../../AQL/DataQueries.html#data-modification-queries).
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{% endhint %}
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ArangoDB also allows removing, replacing, and updating documents based
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on an example document. Every document in the collection will be
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compared against the specified example document and be deleted/replaced/
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updated if all attributes match.
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These method should be used with caution as they are intended to remove or
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modify lots of documents in a collection.
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All methods can optionally be restricted to a specific number of operations.
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However, if a limit is specific but is less than the number of matches, it
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will be undefined which of the matching documents will get removed/modified.
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[Remove by Example](../../../DataModeling/Documents/DocumentMethods.md#remove-by-example),
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[Replace by Example](../../../DataModeling/Documents/DocumentMethods.md#replace-by-example) and
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[Update by Example](../../../DataModeling/Documents/DocumentMethods.md#update-by-example)
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are described with examples in the subchapter
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[Collection Methods](../../../DataModeling/Documents/DocumentMethods.md). |