http://disa.fi.muni.cz/vlastislav-dohnal/teaching/nosql-databases-fall-2019/
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source: Sadalage & Fowler: NoSQL Distilled, 2012
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http://db-engines.com/en/system/Neo4j
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Type Description
boolean true/false
byte 8-bit integer
short 16-bit integer
int 32-bit integer
long 64-bit integer
float 32-bit IEEE 754 floating-point number
double 64-bit IEEE 754 floating-point number
char 16-bit unsigned integer representing a
Unicode character
String sequence of Unicode characters
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What How
get who a person follows outgoing follows relationships, depth one
get the followers of a person incoming follows relationships, depth one
get who a person blocks outgoing blocks relationships, depth one
What How
get the full path of a file incoming file relationships
get all paths for a file incoming file and symbolic link relationships
get all files in a directory outgoing file and symbolic link relationships,
depth one
get all files in a directory, excluding
symbolic links
outgoing file relationships, depth one
get all files in a directory, recursively outgoing file and symbolic link relationships
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Node irena = graphDb.createNode();
irena.setProperty("name", "Irena");
Node jirka = graphDb.createNode();
jirka.setProperty("name", "Jirka");
Relationship i2j = irena.createRelationshipTo(jirka, FRIEND);
Relationship j2i = jirka.createRelationshipTo(irena, FRIEND);
i2j.setProperty("quality", "a good one");
j2i.setProperty("since", 2003);
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● org.neo4j...TraversalDescription
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■ breadthFirst() depthFirst()
● .relationships()
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■ Direction.BOTH
■ Direction.INCOMING
■ Direction.OUTGOING
● org.neo4j...Evaluator
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■ INCLUDE_AND_CONTINUE
■ INCLUDE_AND_PRUNE
■ EXCLUDE_AND_CONTINUE
■ EXCLUDE_AND_PRUNE
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■ Evaluators.toDepth(int depth)
Evaluators.fromDepth(int depth),
■ Evaluators.excludeStartPosition()
■ …
● org.neo4j...Uniqueness
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● Traverser
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TraversalDescription desc =
db.traversalDescription()
.depthFirst()
.relationships( Rels.KNOWS,
Direction.BOTH )
.evaluator(Evaluators.toDepth(3));
// node is ‘Ed’ (Node[2])
for (Node n : desc.traverse(node).nodes())
{
output += n.getProperty("name") + ", ";
}
http://neo4j.com/docs/stable/tutorial-traversal-java-api.html
Ed, Lars, Lisa, Dirk, Peter
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Created 1 node, returned 0 rows
Created 1 node, set 1 property, returned
1 row
Created 1 relationship, returned 1 row
Created 1 node, set 1 property, returned 1 row
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Indexes added: 1
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● I. Holubová, J. Kosek, K. Minařík, D. Novák. Big Data a
NoSQL databáze. Praha: Grada Publishing, 2015. 288 p.
● RNDr. Irena Holubova, Ph.D. MMF UK course NDBI040:
Big Data Management and NoSQL Databases
● Sherif Sakr - Eric Pardede: Graph Data Management:
Techniques and Applications
● Sadalage, P. J., & Fowler, M. (2012). NoSQL Distilled: A
Brief Guide to the Emerging World of Polyglot
Persistence. Addison-Wesley Professional, 192 p.
● http://neo4j.com/docs/stable/