July 30, 2023

tAS400CDC – Docs for ESB 7.x

tAS400CDC

Addresses data extraction and transportation needs.

tAS400CDC only extracts the changes carried out on the source
operational data and makes them available to the target system(s) using database CDC
views.

By default, this component automatically calls the AS/400-dedicated program RUNCDC to
write the latest update information into a change table (a CDC table) and runs queries
in the same table to read changes.

The RUNCDC program is automatically installed by Talend Studio using a
savf script stored in the following directory:
<Studio_install>pluginsorg.talend.designer.cdc_<version>
esourcefitcdc.savf
.

For further information about this fitcdc.savf script
and the command used to install the RUNCDC program, see the section describing how to
set up CDC in Redo/Archive log mode (journal) for
AS/400 in
Talend Studio User Guide
.

tAS400CDC Standard properties

These properties are used to configure tAS400CDC running in the Standard Job framework.

The Standard
tAS400CDC component belongs to the Databases family.

The component in this framework is available in all subscription-based Talend products.

Note: This component is a specific version of a dynamic database
connector. The properties related to database settings vary depending on your database
type selection. For more information about dynamic database connectors, see Dynamic database components.

Basic settings

Database

Select a type of database from the list and click
Apply.

Use an existing connection

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

Note: When a Job contains the parent Job and the child Job, if you
need to share an existing connection between the two levels, for example, to share the
connection created by the parent Job with the child Job, you have to:

  1. In the parent level, register the database connection
    to be shared in the Basic
    settings
    view of the connection component which creates that very database
    connection.

  2. In the child level, use a dedicated connection
    component to read that registered database connection.

For an example about how to share a database connection
across Job levels, see

Talend Studio
User Guide
.

Property type

Either Built-in or Repository

 

Built-in: No property data stored
centrally.

 

Repository: Select the repository
file in which the properties are stored. The fields that follow are
completed automatically using the data retrieved.

Warning:

Reset the DB type by clicking the relevant button to
select the CDC connection.

DB Version

Select the AS/400 database version you are using.

Host name

Database server IP address.

Database

Name of the CDC database.

Note:

The CDC database in which are stored the modified data must be
different from the one containing the source data.

Username and Password

DB user authentication data.

To enter the password, click the […] button next to the
password field, and then in the pop-up dialog box enter the password between double quotes
and click OK to save the settings.

Schema and Edit
Schema

A schema is a row description. It defines the number of fields
(columns) to be processed and passed on to the next component. When you create a Spark
Job, avoid the reserved word line when naming the
fields.

Built-In: You create and store the schema locally for this component
only.

 

Repository: You have already created the schema and stored it in the
Repository. You can reuse it in various projects and Job designs.

Warning:

Reset the DB type by clicking the relevant button to
select the schema of the CDC connection.

 

Click Edit
schema
to make changes to the schema. If the current schema is of the Repository type, three options are available:

  • View schema: choose this
    option to view the schema only.

  • Change to built-in property:
    choose this option to change the schema to Built-in for local changes.

  • Update repository connection:
    choose this option to change the schema stored in the repository and decide whether
    to propagate the changes to all the Jobs upon completion. If you just want to
    propagate the changes to the current Job, you can select No upon completion and choose this schema metadata
    again in the Repository Content
    window.

Table Name

Short name of the source table where changes made to data should be
captured. The target CDC table uses automatically this short name to
name itself.

Source Library

The AS/400 database’s source library.

Note:

The library name must not contain more than 10 characters. The
database name is generally used.

Subscriber

Enter the name of the application that will use the change
table.

Events to catch

Insert: Select this check box to
catch the data inserted in the change table since the last
extraction.

Update: Select this check box to catch
the data updated in the change table since the last extraction.

Delete: Select this check box catch the
data deleted in the change table since the last extraction.

Member

Enter the name of the member that holds the desired records. A member
is part of a physical file in the library and contains a group of
entries. For details, search format of an AS/400
file
at http://www.ibm.com.

Advanced settings

Additional JDBC parameters

Specify additional connection properties for the DB connection you are
creating. This option is not available if you have selected the
Use an existing connection check
box in the Basic settings.

Keep data in CDC Table

Select this check box to keep the changes made available to one or
more target systems, even after they have been consulted.

Trim all the String/Char columns

Select this check box to remove leading and trailing whitespace from
all the String/Char columns.

Trim column

Remove leading and trailing whitespace from defined columns.

Note:

Deselect Trim all the String/Char
columns
to enable Trim columns in this field.

Disable command

Select this check box to be able to manually call the RUNCDC program by yourself to write changes
to the CDC table.

Customize command

Select this check box to write custom commands that override the
default commands used by tAS400CDC.

For example, tAS400CDC by default
executes the following command:
This command does not automatically detach a receiver from its
corresponding journal and cannot create and attach a new one to that
journal, either. In this situation, you can enter your customized
command as follows to automate the detachment and attachment process:

Note that the name of the CDC library is often the name of the CDC
database.

tStatCatcher Statistics

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

Usage

Usage rule

This component is used as a start component. It requires an output
component and row Main link.

Note that the journal and the receiver required by CDC are typically
controlled by the administrator of the AS/400 system. For this reason,
since version 5.4.2 (included) of the Studio, tAS400CDC runs the RUNCDC program only and does not automatically create,
activate, deactivate, modify or delete any journal or receiver of that
AS/400 system any more. You need to contact the AS/400 administrator
before performing any of these operations. Depending on the policy in
your company, the administrator will either perform the operation or
provide you with the authorization to do it yourself.

Because of this behavior updates, since 5.4.2, the tAS400CDC component does not execute the
following command as it did in the 5.4.1 or earlier versions:

This command is used to ensure that an older receiver is detached from
a journal and a newer one is attached to the journal to retrieve the
last change. You are then recommended to execute this command in your
AS/400 system before running this component. Alternatively, enter the
example command given above for the Customize
command
check box is selected, in order to automate the
detachment and attachment process.

For further information about how the CDC for AS/400 is handled by the
Studio since version 5.4.2, see the sections describing the CDC
architecture and how to set up CDC in Redo/Archive
log
mode (journal) for AS/400 in
Talend Studio User Guide
.

Related scenario


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