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Import Distinct Data With Relationships

Import Distinct Data from a CSV file, and create relationships

Here is an example of importing distinct data from a CSV file, and creating relationships using that data.

Graph Population

This method is more efficient than just using MERGE. It never tries to match any duplicates from the csv file as they are filtered out beforehand. It still uses MERGE to ensure that duplicate nodes are not created, but in this situation this would only be required if the csv file was loaded more than once.

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Import Distinct Data

Import Distinct Data from a CSV file

Here are two methods for importing only distinct data from a CSV file, without having to pre-process the CSV for duplicates. Method 2 is more efficient than Method 1.

Graph Population Method 1

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private void ClearDb(IGraphClient client)
{
    client.Cypher
        .Match("(n)")
        .DetachDelete("n")
        .ExecuteWithoutResults();
}

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IF exists( select * from INFORMATION_SCHEMA.COLUMNS where TABLE_NAME='myTable' and COLUMN_NAME='columnToDrop')
BEGIN
ALTER TABLE myTable drop COLUMN columnToDrop
END

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ALTER TABLE [dbo].[MyTable]
ADD CONSTRAINT FK_MyTable_OtherTable FOREIGN KEY (OType)
REFERENCES [dbo].[OtherTable] (Ident)
ON DELETE CASCADE
ON UPDATE CASCADE

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Calendar

Initial Data Setup

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// Seed code from Configuration.cs

protected override void Seed(DAL.Models.Context context)
{
	//  This method will be called after migrating to the latest version.

	// Default Customers - create
	var customers = new[]{
		new Customer { Name = "cust_a" },
		new Customer { Name = "cust_b" },

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Baby Names Graph

Initial Data Setup

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== Baby Names Graph

:neo4j-version: neo4j-2.1
:author: Jacqui Read
:twitter: @tekiegirl

=== Initial Data Setup

//setup
//hide

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Roads, Nodes and Automobiles

or 'How a sat-nav could use a graph database'

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