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## 27.9. A Matrix example

This example is creating a graph of the characters in the Matrix via the shell and then executing Cypher queries against it:

Figure 27.1. Shell Matrix Example

Neo4j is configured for autoindexing, in this case with the following in the Neo4j configuration file:

    node_auto_indexing=true
    node_keys_indexable=name,age

    relationship_auto_indexing=true
    relationship_keys_indexable=ROOT,KNOWS,CODED_BY

The following is a sample shell session creating the Matrix graph and querying it.

     # create the Thomas Andersson node
     neo4j-sh (0)$ mkrel -t ROOT -c -v
     Node (1) created
     Relationship [:ROOT,0] created

     # go to the new node
     neo4j-sh (0)$ cd 1

     # set the name property
     neo4j-sh (1)$ set name "Thomas Andersson"

     # create Thomas direct friends
     neo4j-sh (Thomas Andersson,1)$ mkrel -t KNOWS -cv
     Node (2) created
     Relationship [:KNOWS,1] created

     # go to the new node
     neo4j-sh (Thomas Andersson,1)$ cd 2

     # set the name property
     neo4j-sh (2)$ set name "Trinity"

     # go back in the history stack
     neo4j-sh (Trinity,2)$ cd ..

     # create Thomas direct friends
     neo4j-sh (Thomas Andersson,1)$ mkrel -t KNOWS -cv
     Node (3) created
     Relationship [:KNOWS,2] created

     # go to the new node
     neo4j-sh (Thomas Andersson,1)$ cd 3

     # set the name property
     neo4j-sh (3)$ set name "Morpheus"

     # create relationship to Trinity
     neo4j-sh (Morpheus,3)$ mkrel -t KNOWS 2

     # list the relationships of node 3
     neo4j-sh (Morpheus,3)$ ls -rv
     (me)-[:KNOWS,3]->(Trinity,2)
     (me)<-[:KNOWS,2]-(Thomas Andersson,1)

     # change the current position to relationship #2
     neo4j-sh (Morpheus,3)$ cd -r 2

     # set the age property on the relationship
     neo4j-sh [:KNOWS,2]$ set -t int age 3

     # back to Morpheus
     neo4j-sh [:KNOWS,2]$ cd ..

     # next relationsip
     neo4j-sh (Morpheus,3)$ cd -r 3

     # set the age property on the relationship
     neo4j-sh [:KNOWS,3]$ set -t int age 90

     # position to the start node of the current relationship
     neo4j-sh [:KNOWS,3]$ cd start

     # new node
     neo4j-sh (Morpheus,3)$ mkrel -t KNOWS -c

     # list relationships on the current node
     neo4j-sh (Morpheus,3)$ ls -r
     (me)-[:KNOWS]->(Trinity,2)
     (me)-[:KNOWS]->(4)
     (me)<-[:KNOWS]-(Thomas Andersson,1)

     # go to Cypher
     neo4j-sh (Morpheus,3)$ cd 4

     # set the name
     neo4j-sh (4)$ set name Cypher

     # create new node from Cypher
     neo4j-sh (Cypher,4)$ mkrel -ct KNOWS

     # list relationships
     neo4j-sh (Cypher,4)$ ls -r
     (me)-[:KNOWS]->(5)
     (me)<-[:KNOWS]-(Morpheus,3)

     # go to the Agent Smith node
     neo4j-sh (Cypher,4)$ cd 5

     # set the name
     neo4j-sh (5)$ set name "Agent Smith"

     # outgoing relationship and new node
     neo4j-sh (Agent Smith,5)$ mkrel -cvt CODED_BY
     Node (6) created
     Relationship [:CODED_BY,6] created

     # go there
     neo4j-sh (Agent Smith,5)$ cd 6

     # set the name
     neo4j-sh (6)$ set name "The Architect"

     # go to the first node in the history stack
     neo4j-sh (The Architect,6)$ cd

     # Morpheus' friends, looking up Morpheus by name in the Neo4j autoindex
     neo4j-sh (0)$ start morpheus = node:node_auto_index(name='Morpheus') match morpheus-[:KNOWS]-zionist return zionist.name;
     +--------------------+
     | zionist.name       |
     +--------------------+
     | "Trinity"          |
     | "Cypher"           |
     | "Thomas Andersson" |
     +--------------------+
     3 rows
     39 ms

     # Morpheus' friends, looking up Morpheus by name in the Neo4j autoindex
     neo4j-sh (0)$ start morpheus = node:node_auto_index(name='Morpheus') match morpheus-[:KNOWS]-zionist return zionist.name;
     +--------------------+
     | zionist.name       |
     +--------------------+
     | "Trinity"          |
     | "Cypher"           |
     | "Thomas Andersson" |
     +--------------------+
     3 rows
     0 ms

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