tCreateTemporaryFile

Creates a temporary file in a specified directory. This component allows you to
either keep the temporary file or delete it after the Job execution.

tCreateTemporaryFile Standard properties

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

The Standard
tCreateTemporaryFile component belongs to the File family.

The component in this framework is generally available.

Basic settings

Remove file when execution is over	Select this check box to delete the temporary file after the Job execution.
Use default temporary system directory	Select this check box to create the file in the default system temporary directory.
Directory	Specify the directory under which the temporary file will be created. This field is available only when the Use default temporary system directory check box is cleared.
Template	Enter the temporary file name which should contain the characters XXXX, such as talend_XXXX.
Suffix	Enter the filename extension of the temporary file.

Advanced settings

tStatCatcher Statistics	Select this check box to collect log data at the component level.

Global Variables

Global Variables	FILEPATH: the path where the file was created. This is an After variable and it returns a string. 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 + Space to access the variable list and choose the variable to use from it. For further information about variables, see Talend Studio User Guide.

FILEPATH: the path where the file was created. This is an
After variable and it returns a string.

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 +
Space to access the variable list and choose the variable to use from it.

For further information about variables, see
Talend Studio

User Guide.

Usage

Usage rule	This component can be used as a standalone component of a Job or Subjob.
Connections	Outgoing links (from this component to another): Trigger: On Subjob Ok; On Subjob Error; Run if; On Component Ok; On Component Error. Incoming links (from one component to this one): Row: Iterate. Trigger: Run if; On Subjob Ok; On Subjob Error; On component Ok; On Component Error; Synchronize; Parallelize. For further information regarding connections, see Talend Studio User Guide.

Usage rule

This component can be used as a standalone component of a Job or
Subjob.

Connections

Outgoing links (from this component to another):

Trigger: On Subjob Ok; On Subjob
Error; Run if; On Component Ok; On Component Error.

Incoming links (from one component to this one):

Row: Iterate.

Trigger: Run if; On Subjob Ok; On
Subjob Error; On component Ok; On Component Error; Synchronize;
Parallelize.

For further information regarding connections, see

Talend Studio

User
Guide.

Scenario: Creating a temporary file and writing data into it

This scenario describes a Job that creates a temporary file in the default system
temporary directory, writes data into the file, and finally displays the data in the
file on the console.

Adding and linking the components

Create a new Job and add the following components by typing their names in
the design workspace or dropping them from the Palette: a tCreateTemporaryFile component, a tJava component, a tRowGenerator component, a tFileOutputDelimited component, a tFileInputDelimited component, and a tLogRow component.
Connect tRowGenerator to tFileOutputDelimited using a Row > Main
connection.
Do the same to connect tFileInputDelimited to tLogRow.
Connect tCreateTemporaryFile to tJava using a Trigger > OnSubjobOk
connection.
Do the same to connect tJava to tRowGenerator and connect tRowGenerator to tFileInputDelimited.

Configuring the components

Creating the temporary file

Double-click tCreateTemporaryFile to open
its Basic settings view.
Select the Remove file when execution is
over check box to delete the created temporary file after the
Job execution.
Select the Use default temporary system
directory check box to create the file in the default system
temporary directory.
In the Template field, enter the
temporary file name which should contain the characters XXXX. In this example, it is talend_XXXX.
In the Suffix field, enter the filename
extension of the temporary file. In this example, it is dat.
Double-click tJava to open its Basic settings view.

In the Code field, enter the following
code to display the default system temporary directory and the path to the
temporary file that will be created on the console:

System.out.println("The default system temporary directory is:
" + (String)System.getProperty("java.io.tmpdir"));
System.out.println("The path to the temporary file is:
" + (String)globalMap.get("tCreateTemporaryFile_1_FILEPATH"));

System.out.println("The default system temporary directory is:

" + (String)System.getProperty("java.io.tmpdir"));

System.out.println("The path to the temporary file is:

" + (String)globalMap.get("tCreateTemporaryFile_1_FILEPATH"));

Writing the data into the file

Double-click tRowGenerator to open its
RowGenerator Editor.
Click the [+] button to add two columns:
id of Integer type and name of String type. Then in the Functions column, select the predefined function
Numeric.sequence(String,int,int) for
id and TalendDataGenerator.getFirstName() for name.
In the Number of Rows for RowGenerator
field, enter 5 to generate five
rows.
Click OK to validate the changes and
accept the propagation prompted by the pop-up dialog box.
Double-click tFileOutputDelimited to open
its Basic settings view.
In the File Name field, press Ctrl+Space and from the global variable list
displayed select ((String)globalMap.get(“tCreateTemporaryFile_1_FILEPATH”)).

Reading the data from the file

Double-click tFileInputDelimited to open
its Basic settings view.
In the File name/Stream field, press
Ctrl+Space and from the global variable
list displayed select ((String)globalMap.get(“tCreateTemporaryFile_1_FILEPATH”)).
Click the […] button next to Edit schema and in the dialog box displayed
define the schema by adding two columns: id of Integer type and name of String type.
Click OK to validate the changes and
accept the propagation prompted by the pop-up dialog box.
Double-click tLogRow to open its
Basic settings view.
In the Mode area, select Table (print values in cells of a table) to
display the output data in a better way.

Saving and executing the Job

Press Ctrl+S to save the Job.
Press F6 or click Run on the Run tab to run
the Job.

The file talend_MHTI.dat is created
under the default system temporary directory C:Userslena_liAppDataLocalTemp during the Job
execution, the five generated rows of data is written into it, then the file
is deleted after the Job execution.

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

Thank you for watching.

Docs 6.x

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tCreateTemporaryFile – Docs for ESB 6.x

tCreateTemporaryFile