mirror of https://gitee.com/bigwinds/arangodb
36 lines
1.4 KiB
Plaintext
36 lines
1.4 KiB
Plaintext
!CHAPTER Edges, Identifiers, Handles
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This is an introduction to ArangoDB's interface for edges and how to handle
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edges from the JavaScript shell *arangosh*. For other languages see the
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corresponding language API.
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Edges in ArangoDB are special documents. In addition to the internal
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attributes *_key*, *_id* and *_rev*, they have two attributes *_from* and *_to*,
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which contain [document handles](../Glossary/index.html#document_handle), namely the start-point and the end-point of the edge.
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The values of *_from* and *_to* are immutable once saved.
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[Edge collections](../Glossary/index.html#edge_collection) are special collections that store edge documents. Edge documents
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are connection documents that reference other documents. The type of a collection
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must be specified when a collection is created and cannot be changed afterwards.
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To change edge endpoints you would need to remove old document/edge and insert new one.
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Other fields can be updated as in default collection.
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!SECTION Working with Edges
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!SUBSECTION Insert
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<!-- arangod/V8Server/v8-collection.cpp -->
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@startDocuBlock InsertEdgeCol
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!SUBSECTION Edges
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<!-- arangod/V8Server/v8-query.cpp -->
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@startDocuBlock edgeCollectionEdges
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!SUBSECTION InEdges
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<!-- arangod/V8Server/v8-query.cpp -->
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@startDocuBlock edgeCollectionInEdges
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!SUBSECTION OutEdges
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<!-- arangod/V8Server/v8-query.cpp -->
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@startDocuBlock edgeCollectionOutEdges
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