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## Graph Data Base Basics |
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## Gremlin Installation |
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## Gremlin Syntax |
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#### Add a vertex |
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```gremlin |
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g.addV('student').property('name', 'Jeffery').property('GPA', 4.0); |
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``` |
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#### Update a Property |
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```gremlin |
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g.V(1).property('name', 'Jeffery R'); |
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``` |
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#### Selection |
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```gremlin |
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g.V().hasLabel('student').valueMap(); |
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``` |
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```gremlin |
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g.V().hasLabel('student').values('name'); |
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``` |
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```gremlin |
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g.V().hasLabel('student').order().by('gpa', decr).valueMap(); |
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``` |
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#### Adding Edges |
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```gremlin |
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g.V(0).as('a').V(1).as('b').addE('knows') |
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.from('a').to('b'); |
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``` |
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#### Traversing Graph |
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## Using Gremlin With Java |
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```maven |
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<!-- https://mvnrepository.com/artifact/com.tinkerpop/gremlin-core --> |
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<dependency> |
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<groupId>com.tinkerpop</groupId> |
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<artifactId>gremlin-core</artifactId> |
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<version>3.0.0.M7</version> |
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</dependency> |
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<!-- https://mvnrepository.com/artifact/org.apache.tinkerpop/gremlin-driver --> |
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<dependency> |
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<groupId>org.apache.tinkerpop</groupId> |
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<artifactId>gremlin-driver</artifactId> |
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<version>3.3.3</version> |
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</dependency> |
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<dependency> |
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<groupId>org.apache.tinkerpop</groupId> |
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<artifactId>tinkergraph-gremlin</artifactId> |
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<version>3.3.3</version> |
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</dependency> |
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``` |
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```java |
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public class GraphConnection |
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{ |
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/** Stores/manages client connections **/ |
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private Cluster cluster; |
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/** Connection to the graph db */ |
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private Client client; |
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public RemoteConnection() |
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{ |
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Cluster.Builder b = Cluster.build(); |
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b.addContactPoint("localhost"); |
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b.port(8182); |
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this.cluster = b.create(); |
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this.client = cluster.connect(); |
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} |
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public synchronized ResultSet queryGraph(String q) |
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{ |
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return this.client.submit(q); |
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} |
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public void closeConnection() |
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{ |
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this.cluster.close(); |
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} |
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} |
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``` |