July 30, 2023

tNeo4jBatchOutput – Docs for ESB 7.x


Receives data from the preceding component and writes the data into a local Neo4j database.

tNeo4jBatchOutput is used to write nodes
in a Neo4j database based on the defined index.

tNeo4jBatchOutput Standard properties

These properties are used to configure tNeo4jBatchOutput running in the Standard Job framework.

The Standard
tNeo4jBatchOutput component belongs to the Big Data and the Databases NoSQL families.

The component in this framework is available in all Talend products with Big Data
and in Talend Data Fabric.

Basic settings

Use an existing

Select this check box and in the Component List click the relevant connection component to
reuse the connection details you already defined.

This component supports Neo4j version V3.2.X only and does not support the remote mode. Therefore, do not reuse the connection to versions other than V3.2.X defined in a tNeo4jConnection component and do not select the Remote server check box in tNeo4jConnection.

not use a 2.X.X version and a 3.X.X version in the same Job. Otherwise,
class conflict issues occur.

Database path

Specify the directory to hold your data files. If the specified
directory does not exist, it will be created.

This field
appears only if you do not select the Use an
existing connection
check box.

Shutdown after

Select this check box to shutdown the Neo4j database connection when no more
operations on Neo4j are going to be performed after the current

Alternatively, you can use tNeo4jClose to shutdown the

This avoids errors such as “Id file not properly shutdown” at next execution
of Jobs involving Neo4j.

This check box is available only if the Use an existing
check box is not selected.

Field that contains the label list

Select the column from the input schema you have defined in the preceding components to provide labels for the nodes to be created.

When the input data provides multiple labels for a node, separate those labels by semi-colons (;) in the preceding components.

Index name

Enter, within double quotation marks, the name of the index to be created for the nodes. This index is used to store the identifiers of the nodes and help create relationships.

Import identifier

Select the column from the input schema you have defined in the preceding components to provide identifiers for the nodes to be created. These identifiers are stored in the index to be created and must be unique cross the index.

Therefore, ensure that the column to be used contains only unique values.

Save the identifier

Select this check box to save the technical identifiers (native graph ids).

For further information about the different types of Neo4j entity identifiers, see Neo4j documentation: Entity identifier.

Number of index elements in memory

Enter, without double quotation marks, the cache size used to keep the index elements in memory. This value must be enough to keep all of the index elements in memory.

For further information, see Neo4j documentation: Memory tuning.

Advanced settings

Neo4j configuration

Add parameters to the table to configure the database to be created.

For further information, see Neo4j documentation: Configuration settings.

When entering values, use the syntax demonstrated by the examples given alongside the column names of this Nodes files table.

tStatCatcher Statistics

Select this check box to gather the Job processing metadata at the Job level
as well as at each component level.

Global Variables

Global Variables

NB_LINE: the number of rows read by an input component or
transferred to an output component. This is an After variable and it returns an

ERROR_MESSAGE: the error message generated by the
component when an error occurs. This is an After variable and it returns a string. This
variable functions only if the Die on error check box is
cleared, if the component has this check box.

A Flow variable functions during the execution of a component while an After variable
functions after the execution of the component.

To fill up a field or expression with a variable, press Ctrl +
to access the variable list and choose the variable to use from it.

For further information about variables, see
Talend Studio

User Guide.


Usage rule

This component is used as an output component
and it always needs an incoming link.

Document get from Talend https://help.talend.com
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