Today in this article, we will cover how to Get and Convert timestamp into Date in neo4j cypher query.

We will convert the timestamp in date and also date into timestamp supporting epoch format

Let’s see below timestamp example which we will convert into a date in neo4j date.

as shown below timestamp() function gives us the current timestamp in EPOCH format.

timestamp as 1707929333554

Format timestamp into DateTime format – Neo4j

Example

datetime({epochmillis:timestamp()})

Convert Epoch timestamp into only date format – Neo4j Cypher

date(datetime({epochmillis:timestamp()}))

Example

Convert millisecond to date format

If you already have custom value then using the below command you achieve the same,

return date(datetime({epochmillis:1707929333554}))

Alternatively, one can use the below way to get the DateTime from epoch time

Get the Date from EPOCH milliseconds

You can get the Date from EPOCH milliseconds as below ,

WITH 1707929333554 as epochTime
RETURN datetime({epochmillis: epochTime});

Get the Date from EPOCH seconds

You can get the Date from EPOCH seconds as below,

WITH 1614556800 as epochTime
RETURN datetime({epochSeconds: epochTime});

Other References :

• Neo4j Graph – Date Time greater than or less than query with examples

Do you have any comments or ideas or any better suggestions to share?

Please sound off your comments below.

Happy Coding !!

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Today in this article, we will see Neo4j – Get node by id with cypher query examples.

We will see how to get nodes/records using the ID of a given node.

The ID is a function that gets you the ID of a node or relationship. It does return the same value for both nodes and relationships in the same database.

Please note that this ID is different from any property called ID or ID that you create in a custom way.

As a good practice, it is recommended not to use this property for any data access or operations.

As per Neo4j guidelines,

Neo4j reuses its internal IDs when nodes and relationships are deleted and recreated This means that applications using, and relying on internal Neo4j IDs, are brittle or at risk of making mistakes. It is therefore recommended to rather use application-generated IDs.

Getting started

Here below is a sample schema or document we shall use for the date range query,

Neo4j get Nodes ID query – Commands with examples

MATCH (n:Movie) RETURN ID(n) limit 5

Here we will be using the above query to get the IDs of each node from the movie node label.

Neo4j Nodes using ID query – Commands with examples

Let’s now do the vice versa. We will access the nodes or relationships using the above ID.

MATCH (n:Movie) where  ID (n) = 15 return n

Above we are returning the node where ID is equal to 15

Neo4j 5 and above changes

The function id() is deprecated. It is recommended to use elementId().

Example

MATCH (n:Movie) where  elementId (n) = 15 return 

Other references:

• Neo4j Graph – Date Time query with examples

That’s all! Happy coding!

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Today in this article, we will see how to read a CSV file into Neo4j,.We will use the LOAD CSV Cypher clause.

One common task in data management is importing data from external sources, such as CSV or Excel files, into Neo4j.

In this article, we’ll explore how to efficiently read CSV files into Neo4j, complete with practical examples to guide you through the process.

LOAD CSV clause in the Neo4j browser allows you to import data from CSV files directly into your Neo4j graph database.

Neo4j, being a graph database, organizes data into nodes, relationships, and properties.

On the other hand, CSV (Comma-Separated Values) files are a popular format for storing tabular data.

When importing CSV data into Neo4j, each row typically corresponds to a node, with columns representing node properties or relationships.

Example CSV Data

We will use below sample CSV file to import

Cypher Import Commands

Open Neo4j database management interface (Neo4j Browser or Neo4j Desktop).

Please use below Cypher, Neo4j’s query language, to import the CSV data.

LOAD CSV WITH HEADERS FROM 'file:///your_file.csv' AS row return line 

The above logic loads the specified file into a memory object called row which we are returning line by line just for validation purposes.

LOAD CSV WITH HEADERS FROM 'file:///your_file.csv' AS row
CREATE (:Movie{id: toInteger(row.id), title: row.title, released: row.released,  tagline: row.tagline}))

Please see below details on the command used

Here’s a breakdown of what this query does:

• LOAD CSV WITH HEADERS:
  • This clause loads the CSV file and assumes the first row contains headers that define the column names.

• FROM 'file:///data.csv':
  • Specifies the path to the CSV file. In this example, the file is assumed to be in the import directory of the Neo4j database.

• AS row:
  • Defines an alias row that represents each row in the CSV file.

• LOAD CSV WITH HEADERS FROM ‘file:///data.csv’ AS row CREATE (:Movie{id: toInteger(row.id), title: row.title, released: row.released, tagline: row.tagline}))
  • Creates a new node for each row in the CSV file with the label Movie and properties id, title, and released date and tagline details that are used to convert the id and age values from strings to integers.

That’s all! Happy coding!

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Today in the article, we will see how to perform Neo4J Delete or Reset Databases with examples.

Recently I had a use case where I had to delete existing corrupted data. I wanted to delete the database to allow me to remove outdated or irrelevant data to free up storage space and improve query performance.

However, you may find other use cases like the as below where you want to delete any existing database.

Example Use Cases

• Development and Testing: You might want to delete and recreate your Neo4j database to ensure a clean slate for each iteration. This helps in debugging and verifying that your data import and query processes work correctly.

• Starting Fresh: If you want to start over with a clean slate for a project, and hence you may want to delete the existing database and create a new one with the desired structure and data.

• Migrations and Upgrades: During migrations or database upgrades, you might need to delete the old database and create a new one that is compatible with the latest version of Neo4j.

• Performance Tuning: In some cases, a database may accumulate inefficiencies or performance bottlenecks over time. Deleting and recreating the database can be a way to address these issues and start with an optimized configuration.

Neo4J Delete or Reset All Databases

You may want to delete all databases in Neo4j and start with a clean slate, you can use the following steps:

Step1- Stop Neo4j Server

Before running any delete or cleanup command make sure that the Neo4j server is not running. Please use the below command to stop the neo4j server

neo4j stop

Step2- Remove the entire Graph Databases Directory

You can remove the entire Graph Databases Directory using the below command

Navigate to the Neo4j data directory, which is usually located at $NEO4J_HOME/data/databases/, and delete all the directories and files within the “databases” directory.

rm -rf data/*

OR

rm -rf $NEO4J_HOME/data/*

Note- Please identify the graph directory depending on the OS type ( Mac, Ubuntu, Windows) you are using

Step3 : Start Neo4j

neo4j start

This will remove all existing databases and start with a clean database directory.

Delete all Nodes and Relationships in Neo4j

In Neo4j, if you want to delete specific nodes in a database, you can do so by using a Cypher query to identify and delete those nodes.

Here’s how you can delete selected nodes.

Example 1

MATCH (n)
DETACH DELETE n

The above query could be causing performance issues for a large set of data.

You may use the MATCH clause to execute the query.

Example 2

MATCH (p:Person) 

WHERE p.age < 18 

DETACH DELETE p

Using DETACH DELETE remove all of the nodes and associated relationships.

If you want to delete only the nodes and keep the relationships, you can use the DELETE clause without DETACH. However, this may leave orphaned relationships.

Delete Specific Database in Neo4j

Navigate to the Neo4j data directory, which is usually located at $NEO4J_HOME/data/databases/, and delete the directory corresponding to the database you want to remove.

Example

if you want to delete a database named “testdb” you would delete the directory

 rm -rf $NEO4J_HOME/data/databases/testdb

Using Transaction – To delete All the Nodes and Relationship

BEGIN
MATCH (p:Person)
OPTIONAL MATCH (p)-[rel:RELATIONSHIP_TYPE]-()
DELETE p, rel
COMMIT

Above, please replace the Person with the actual label and “RELATIONSHIP_TYPE” with the type of relationship you want to delete.

Database Transactions are useful for data consistency and preventing issues when dealing with huge database executed with complex operations like node and relationship deletions.

That’s all! Happy coding!

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Today in this article, we will see how to query the Neo4j Graph – Date Time query with examples.

We will see how to get records based on date/time greater than or less than scenarios.

We will also how to get records between 2 dates range given.

Today in this article, we will cover below aspects,

Getting started

Here below is a sample schema or document we shall use for the date range query,

Neo4j Date Cypher query – Commands with examples

Here we will be using the below query to get the documents between two dates in Neo4j Collection.

Date greater than cypher query

Command

MATCH (n:Node) WHERE n.FieldName > datetime('Date here')
return n

Where

• FieldName – It is a date-time stamp property as expected date format

• Node – the name of the Node.

Date Less than cypher query

Command

MATCH (n:Node) WHERE n.FieldName < datetime('Date here')
return n

Date greater than and less than the query

Command

MATCH (n:Node) WHERE n.FieldName> datetime('date here') AND  n.FieldName< datetime('date here')
return n

Let’s now look few real examples and query execution patterns.

Example – Neo4j Graph – Date Time query – Date Less than

Below is the Neo4j date query for less than dates.

Example

MATCH (n:Person) WHERE n.DateAdded < datetime('2020-06-23')
return n

The above query gives us a total of 264 nodes with relationship details.

Example – Neo4j Date query – greater than dates

Below is the Neo4j query for less than dates.

Query Pattern

MATCH (n:Person) WHERE n.DateAdded > datetime('2020-06-23')
return n

The above query gives us a total of 2 nodes with relationship details.

Neo4j cypher query – Get records between greater than and less than dates

Query Pattern :

MATCH (n:Person) WHERE n.DateAdded > datetime('2009-05-23') AND  n.DateAdded < datetime('2021-06-23')
return n

Example :

The query will identify all the records falling between two specified dates.

References :

• Getting Started with Neo4j GraphDB in C# ASP.NET Core

• Neo4jClient Cypher query in C# ASP.NET Core

Do you have any comments or ideas or any better suggestions to share?

Please sound off your comments below.

Happy Coding !!

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The post Neo4j Graph – Date Time query with examples first appeared on TheCodeBuzz.