mirror of https://gitee.com/bigwinds/arangodb
132 lines
3.3 KiB
Markdown
132 lines
3.3 KiB
Markdown
---
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layout: default
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description: Manipulating the edge collection
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---
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# Manipulating the edge collection
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## ArangoGraph.edgeCollection
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`ArangoGraph.edgeCollection(String name) : ArangoEdgeCollection`
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Returns a _ArangoEdgeCollection_ instance for the given edge collection name.
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**Arguments**
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- **name**: `String`
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Name of the edge collection
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**Examples**
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```Java
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ArangoDB arango = new ArangoDB.Builder().build();
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ArangoDatabase db = arango.db("myDB");
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ArangoGraph graph = db.graph("some-graph");
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ArangoEdgeCollection collection = graph.edgeCollection("some-edge-collection");
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```
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## ArangoGraph.getEdgeDefinitions
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`ArangoGraph.getEdgeDefinitions() : Collection<String>`
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Fetches all edge collections from the graph and returns a list of collection names.
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**Examples**
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```Java
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ArangoDB arango = new ArangoDB.Builder().build();
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ArangoDatabase db = arango.db("myDB");
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ArangoGraph graph = db.graph("some-graph");
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Collection<String> collections = graph.getEdgeDefinitions();
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```
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## ArangoGraph.addEdgeDefinition
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`ArangoGraph.addEdgeDefinition(EdgeDefinition definition) : GraphEntity`
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Adds the given edge definition to the graph.
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**Arguments**
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- **definition**: `EdgeDefinition`
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The edge definition
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**Examples**
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```Java
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ArangoDB arango = new ArangoDB.Builder().build();
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ArangoDatabase db = arango.db("myDB");
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ArangoGraph graph = db.graph("some-graph");
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EdgeDefinition edgeDefinition = new EdgeDefinition()
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.collection("edges")
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.from("start-vertices")
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.to("end-vertices");
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graph.addEdgeDefinition(edgeDefinition);
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// the edge definition has been added to the graph
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```
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## ArangoGraph.replaceEdgeDefinition
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`ArangoGraph.replaceEdgeDefinition(EdgeDefinition definition) : GraphEntity`
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Change one specific edge definition. This will modify all occurrences of this
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definition in all graphs known to your database.
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**Arguments**
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- **definition**: `EdgeDefinition`
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The edge definition
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**Examples**
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```Java
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ArangoDB arango = new ArangoDB.Builder().build();
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ArangoDatabase db = arango.db("myDB");
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ArangoGraph graph = db.graph("some-graph");
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EdgeDefinition edgeDefinition = new EdgeDefinition()
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.collection("edges")
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.from("start-vertices")
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.to("end-vertices");
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graph.replaceEdgeDefinition(edgeDefinition);
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// the edge definition has been modified
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```
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## ArangoGraph.removeEdgeDefinition
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`ArangoGraph.removeEdgeDefinition(String definitionName) : GraphEntity`
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Remove one edge definition from the graph. This will only remove the
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edge collection, the vertex collections remain untouched and can still
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be used in your queries.
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**Arguments**
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- **definitionName**: `String`
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The name of the edge collection used in the definition
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**Examples**
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```Java
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ArangoDB arango = new ArangoDB.Builder().build();
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ArangoDatabase db = arango.db("myDB");
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ArangoGraph graph = db.graph("some-graph");
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EdgeDefinition edgeDefinition = new EdgeDefinition()
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.collection("edges")
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.from("start-vertices")
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.to("end-vertices");
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graph.addEdgeDefinition(edgeDefinition);
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// the edge definition has been added to the graph
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graph.removeEdgeDefinition("edges");
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// the edge definition has been removed
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```
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