README
¶
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go4neo
Neo4j interface written in golang.
Information
- Schedule: https://zhuffles.dev/blog/classes/
- Stream: https://www.twitch.tv/zhuffles
- Youtube: https://www.youtube.com/channel/UCW6eiMiVqYroPX1qiosAbnQ
- Discord: https://discord.com/invite/r4wxkXd
Materials
- Introduction: https://www.youtube.com/watch?v=oRtVdXvtD3o&ab_channel=MicrosoftResearch
- Installing: https://neo4j.com/download/
- Getting started: https://neo4j.com/developer/go/
- Driver: https://github.com/neo4j/neo4j-go-driver
- Cypher: https://neo4j.com/developer/cypher/intro-cypher/
- Cypher Manual: https://neo4j.com/docs/cypher-manual/current
- Operations Manual: https://neo4j.com/docs/operations-manual/current/introduction/
Good to know
- Delete all data: MATCH (n) DETACH DELETE n;
Examples of Query operators
- match X {name:dasdasd}
- Match X with(Y) Z
- Match X with(Y) Z Where exists X with(D) A RETURN x,y,z
- min, max - gets min or max value from data
- Union - unifies two queries..
- ORDER BY .. etc.
- AS - sets something to a variable
- collect - to get a list of results
- set - used to change fields
Advanced query
Using a block {} makes variables inside that block accessable .. SEE: t
MATCH (person:Person)-[:WORKS_FOR]->(company)
WHERE company.name STARTS WITH "Company"
AND EXISTS {
MATCH (person)-[:LIKES]->(t:Technology)
WHERE size((t)<-[:LIKES]-()) >= 3
}
RETURN person.name as person, company.name AS company;
Advanced Query combination with Union
The first query returns results for the next one
MATCH (p:Person)-[:LIKES]->(:Technology {type: "Java"})
RETURN p.name AS person, p.birthdate AS dob
ORDER BY dob DESC
UNION
MATCH (p:Person)
WHERE size((p)-[:IS_FRIENDS_WITH]->()) > 1
RETURN p.name AS person, p.birthdate AS dob
ORDER BY dob DESC;
Super advanced 2x sets combined to list
CALL {
MATCH (p:Person)-[:LIKES]->(:Technology {type: "Java"})
RETURN p
UNION
MATCH (p:Person)
WHERE size((p)-[:IS_FRIENDS_WITH]->()) > 1
RETURN p
}
RETURN p.name AS person, p.birthdate AS dob
ORDER BY dob DESC;
and if you want to show the relationships too ...
CALL {
MATCH (p:Person)-[:LIKES]->(:Technology {type: "Java"})
RETURN p
UNION
MATCH (p:Person)
WHERE size((p)-[:IS_FRIENDS_WITH]->()) > 1
RETURN p
}
WITH p,
[(p)-[:LIKES]->(t) | t.type] AS technologies,
[(p)-[:IS_FRIENDS_WITH]->(f) | f.name] AS friends
RETURN p.name AS person, p.birthdate AS dob, technologies, friends
ORDER BY dob DESC;
=======
# go4neo
Neo4j interface written in golang.
# Information
- Schedule: https://zhuffles.dev/blog/classes/
- Stream: https://www.twitch.tv/zhuffles
- Youtube: https://www.youtube.com/channel/UCW6eiMiVqYroPX1qiosAbnQ
- Discord: https://discord.com/invite/r4wxkXd
# Materials
- Introduction: https://www.youtube.com/watch?v=oRtVdXvtD3o&ab_channel=MicrosoftResearch
- Installing: https://neo4j.com/download/
- Getting started: https://neo4j.com/developer/go/
- Driver: https://github.com/neo4j/neo4j-go-driver
- Cypher: https://neo4j.com/developer/cypher/intro-cypher/
- Cypher Manual: https://neo4j.com/docs/cypher-manual/current
- Operations Manual: https://neo4j.com/docs/operations-manual/current/introduction/
# Good to know
- Delete all data: MATCH (n) DETACH DELETE n;
# Examples of Query operators
- match X {name:dasdasd}
- Match X with(Y) Z
- Match X with(Y) Z Where exists X with(D) A RETURN x,y,z
- min, max - gets min or max value from data
- Union - unifies two queries..
- ORDER BY .. etc.
- AS - sets something to a variable
- collect - to get a list of results
- set - used to change fields
# Advanced query
Using a block {} makes variables inside that block accessable .. SEE: t
MATCH (p:Person)-[:WORKS_FOR]->(c:Company) WHERE c.name STARTS WITH "Face" AND EXISTS { MATCH (p)-[:LIKES]->(t:Technology) WHERE size((t)<-[:LIKES]-()) >= 3 } RETURN p.name as p, c.name AS company;
# Advanced Query combination with Union
The first query returns results for the next one
MATCH (p:Person)-[:LIKES]->(:Technology {type: "Java"}) RETURN p.name AS person, p.birthdate AS dob ORDER BY dob DESC
UNION
MATCH (p:Person) WHERE size((p)-[:IS_FRIENDS_WITH]->()) > 1 RETURN p.name AS person, p.birthdate AS dob ORDER BY dob DESC;
# Super advanced 2x sets combined to list
CALL { MATCH (p:Person)-[:LIKES]->(:Technology {type: "Java"}) RETURN p
UNION
MATCH (p:Person)
WHERE size((p)-[:IS_FRIENDS_WITH]->()) > 1
RETURN p
} RETURN p.name AS person, p.birthdate AS dob ORDER BY dob DESC;
and if you want to show the relationships too ...
CALL { MATCH (p:Person)-[:LIKES]->(:Technology {type: "Java"}) RETURN p
UNION
MATCH (p:Person)
WHERE size((p)-[:IS_FRIENDS_WITH]->()) > 1
RETURN p
} WITH p, [(p)-[:LIKES]->(t) | t.type] AS technologies, [(p)-[:IS_FRIENDS_WITH]->(f) | f.name] AS friends
RETURN p.name AS person, p.birthdate AS dob, technologies, friends ORDER BY dob DESC;
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