neo4j-apoc-procedures | Awesome Procedures On Cypher for Neo4j - codenamed `` apoc | Graph Database library
kandi X-RAY | neo4j-apoc-procedures Summary
kandi X-RAY | neo4j-apoc-procedures Summary
Awesome Procedures On Cypher for Neo4j - codenamed "apoc" If you like it, please ★ above ⇧
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Top functions reviewed by kandi - BETA
- Load data from a URL
- Extract the header values from the selection
- Creates a new mapping
- Get a boolean value from the configuration
- Generates a random edge set
- Returns a random index with the given weight
- Read data from a database
- Creates a new node
- Generates a complete graph of edges
- Generate an undirected network
- Average duration of a list
- Create driver configuration object
- Generates nodes
- Map fragment to parallel batches
- Exports the node to the schema
- Add node to Gephi
- Returns the default parameter value
- Verifies that the configuration has already been created
- Checks whether the e - G - G distribution is a valid heuristic test
- Generate relationships
- Executes a cypher query on the specified fragment
- Label entries by label
- Generates a ring network
- Executes cypher query on the given fragment
- Export apoc metadata
- Gets the cluster environment
neo4j-apoc-procedures Key Features
neo4j-apoc-procedures Examples and Code Snippets
License : Strong Copyleft (CC BY-SA 4.0)
Copy// get paths in an efficient way, so up to a 'leaf'
MATCH p=(source)-[:REL*]->(n)
WHERE NOT EXISTS((n)-[:REL]->())
// create a set of rows for each path. number of rows equals length of path
UNWIND RANGE(1,LENGTH(p)) AS i
WITH sourcSELECT i.IssueID,
floor(ia.TimeSpent / 600000000.0 ) as minutes
FROM IssueActivities ia
INNER JOIN Issues i ON ia.IssueID = i.IssueID
INNER JOIN IssueActivityTypes iat ON ia.IssueActivityTypeID = iat.IssueActivityTypeID
INNER JOIN AllSELECT a.model,
SUM(a.location = 'AoC-Reno') AS Reno,
SUM(a.location = 'AoC-Fargo') AS Fargo,
SUM(a.location = 'EoC') AS EoC,
SUM(a.location = 'APoC') as APoC
FROM models m JOIN
assets a
on m.model = aCommunity Discussions
Trending Discussions on neo4j-apoc-procedures
QUESTION
I currently load a directory of json files in to my neo4j database each day.
If a file ID already exists in the database I do nothing, if there are new file IDs I create new nodes, if the filename ID no longer exists in the directory then I would like to delete the node with the matching ID.
With apoc.load.json I am using failOnError:false so that the script doesn't fail if any of the files no longer exist and therefore cannot be loaded.
I have attempted various examples to pass on the ID of the missing file ie where it has returned a null, but so far the best I have come up with is the below which still does not delete the required node as when the error occurs it moves on to the next file to load. This is a snippet, there is further code for creation that occurs after this point:
...ANSWER
Answered 2022-Jan-03 at 22:05I've tested the code, and there seems to be no way to get an empty map when the load.json procedure fails. Perhaps open another feature request and explain your problem. In the meantime, I would suggest to do the following as a workaround.
First, add a secondary label to all File nodes.
QUESTION
Here is what I'm working with. I have a Neo4J database with a number of nodes of label com. These nodes contain a key property - which uniquely groups them in the fashion that I want. They also have a timestamp property, as well as a number of other integer properties. Here's the issue I'm facing. I want to use the APOC graph grouping procedure to aggregate these nodes together, based on their key properties. However, I want to do so selectively - such that I only aggregate the nodes if their timestamp property meets a provided time window. I have tried to MATCH and filter the nodes with a WHERE clause based on their timestamp, but I am unable to specifically pass those nodes to the nodes.group procedure. Basically, I need to figure out how to CALL nodes.group only on a specific subset of nodes. I'd appreciate any help.
This is the procedure I'm talking about: https://neo4j-contrib.github.io/neo4j-apoc-procedures/3.5/virtual/graph-grouping/
Here is the CALL I'm performing: CALL apoc.nodes.group(['com'], ['key'], [{val1: 'sum', val2: 'sum', val3: 'sum',' time_start: 'collect'}]) YIELD node
As I mentioned above, I tried performing a MATCH (c:com) WHERE c.time_start >= datetime('2020-12-16T21:45:05Z') Prior to the procedure and then chaining queries, but it did not work. The procedure still got called on ALL nodes of com relationship, not just the ones I filtered.
...ANSWER
Answered 2020-Dec-19 at 18:41The procedure itself does not allow you to pass such filters. There are however two possibilities to circumvent this :
- build the virtual graph yourself with vNode and vRelationship
- set a temporary label after your node selection and group on that
I will focus on option 2 :
Take the following graph as an example :
QUESTION
What is the difference between procedure apoc.cypher.mapParallel and apoc.cypher.mapParallel2? The documentation for both has an identical help text, Call apoc.help("mapParallel") reveals an identical signature. In which parallelisation scenario do I use which procedure?
ANSWER
Answered 2020-Apr-06 at 16:57Looking at https://github.com/neo4j-contrib/neo4j-apoc-procedures/blob/4.0/src/main/java/apoc/cypher/Cypher.java, mapParallel2 has two more input parameters: partitions and timeout. It's clear what timeout does. partitions is 100*number of cores by default. That's what used in mapParallel and mapParallel2. The only difference is that you can change it if you want when you call mapParallel2.
QUESTION
I am running neo4j on an ec2 machine and I want to run some graph algorithms. The problem is that some of the algorithms I want to use are not installed properly and I am getting this error : There is no procedure with the name xxxx registered for this database instance.
By executing CALL apoc.help('algo') I only get 17 procedures and the procedures I want to use are not listed. Some of the procedures not listed are apoc.algo.betweenness, apoc.algo.closeness and algo.pagerank.stream
neo4j version : neo4j 3.5.14, apoc-version : 3.5.0.8, neo4j-graph-algorithms-version : 3.5.14
I have also added this to my neo4j config file
...ANSWER
Answered 2020-Mar-18 at 18:22Some algorithms were moved from the APOC library to the algo library, and improved along the way.
Here is the documentation on the new algo.betweenness family of procedures.
QUESTION
By reading the official Neo4j documentation, I can't understand what does the two parameters limit and maxLevel mean in a apoc.path.subgraphnodes.
https://neo4j-contrib.github.io/neo4j-apoc-procedures/3.5/path-finding/path-expander/
Anyone can help me ?
Thanks in advance
...ANSWER
Answered 2020-Feb-18 at 20:34maxLevel is basically the depth of the expansion. maxLevel:2 means up to two expansions from the starting node.
limit limits the total results returned from the call, once this many results are found, then it will stop looking further.
So as an example, if we had a social graph, and you wanted to find the first 3 :Doctor nodes, within 10 expansions of you (this uses breadth first expansion by default), you might use something like:
QUESTION
I've installed neo4j on ubuntu 18.04 and everything is working fine. However when I try to edit the neo4j.config file, it seems that the desired change is not being applied.
For example, I tried following this answer to create a new database, but it failed to load the new db.
My major problem however is when using apoc plugin, i've followed this guide to install and use the plugin, but whenever I try to call a procedure found here, i get the following error:
There is no procedure with the name `apoc.coll.intersection` registered for this database instance. Please ensure you've spelled the procedure name correctly and that the procedure is properly deployed.
When I use check the neo4j service status using serivce neo4j status I get the following:
ANSWER
Answered 2020-Feb-04 at 14:28I am sure that /etc/neo4j/neo4j.conf is the right configuration file. The clue about your problem is in the start of the message
There is no procedure with the name
apoc.coll.intersection
apoc.coll.intersection is a function.
Try this to see if the function is indeed there.
QUESTION
I am trying to figure out how to create a meta model for a graph database on Azure Cosmos DB using the Gremlin API, such as the meta graph in neo4j, but I haven't been able to find a way so far.
I want to be able to see the entities of my database as nodes, and the relationships among them as edges, without having to load any data yet (so that I can map these nodes and edges programmatically to the data sources, and the sources are only called -and the data loaded- when there is a matching query).
The only information that's relatively close to this that I've managed to find, is about visualizing the whole graph but not its meta structure (although even this seems to not be possible yet, or only possible through external visualization platforms).
Is it actually possible to do so? Or Cosmos DB being a schema-free database means that it indeed isn't?
...ANSWER
Answered 2020-Jan-23 at 21:25There isn't a way to specify a meta-graph in Azure Cosmos DB's Gremlin API - usually Azure Data Factory, or other application-level solutions are recommended.
QUESTION
I wanted to test some graph algorithms, node similarity in particular. So I've setup a docker container using neo4j:3.5 (which is v3.5.14 at the moment) official docker image. Additionally I've downloaded APOC v3.5.0.7 and Graph Algorithms v3.5.4.0 and added this line to the config:
dbms.security.procedures.unrestricted=algo.*
Unfortunately function algo.nodeSimilarity seems not to be present in the registered functions:
ANSWER
Answered 2020-Jan-21 at 14:41The Github repo for the Graph Algorithms plugin doesn't seem to actually be up to date - the latest version of the plugin is 3.5.14, available from the download centre which definitely contains the algo.nodeSimilarity algorithm. There are other versions available - this JSON file contains all the variants which isn't super discoverable.
The docs are a bit odd in that they claim everything is in v3.5, but don't say exactly which revision of 3.5 they appeared in. I can't tell when algo.nodeSimilarity appeared, but I'm using 3.5.13 in my 3.5.13 database and it's present there at least.
It doesn't appear that the Graph Algorithms library uses any form of semantic versioning, and I have yet to find a source for the historic release notes version-by-version.
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Install neo4j-apoc-procedures
You can use neo4j-apoc-procedures like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the neo4j-apoc-procedures component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer maven.apache.org. For Gradle installation, please refer gradle.org .
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