July 30, 2023

tDB2CDC – Docs for ESB 7.x

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  4. tDB2CDC – Docs for ESB 7.x

tDB2CDC

Extracts the changes done to the source operational data and makes them available
to the target system(s) using database CDC views.

tDB2CDC extracts the data from a
source system which has changed since the last extraction and
transports it to another/other system(s).

tDB2CDC Standard properties

These properties are used to configure tDB2CDC running in the Standard Job framework.

The Standard
tDB2CDC 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.

Property type

Either Built-in or Repository.

 

Built-in: No property data stored
centrally.

 

Repository: Select the repository
file where Properties are stored. The fields that come after are
pre-filled in using the fetched data.

Warning:

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

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.

Host name

Database server IP address.

Port

DB server listening port number.

Database

Name of the database.

Schema

Name of the schema

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 using CDC 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: The schema is created
and stored locally for this component only. Related topic: see

Talend Studio User
Guide.

 

Repository: The schema already
exists and is stored in the Repository, hence can be reused. Related
topic: see
Talend Studio User
Guide.

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

Select the source table where to capture any changes made on data.

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 to
catch the data deleted in the change table since the last
extraction.

Advanced settings

Additional JDBC parameters

Specify additional connection properties for the DB connection you
are creating.

Note:

You can set the encoding parameters through this field.

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.

tStatCatcher Statistics

Select this check box to collect log data at the component
level.
Enable parallel execution
Select this check box to perform high-speed data processing, by treating
multiple data flows simultaneously. Note that this feature depends on the database or
the application ability to handle multiple inserts in parallel as well as the number of
CPU affected. In the Number of parallel executions
field, either:

  • Enter the number of parallel executions desired.
  • Press Ctrl + Space and select the
    appropriate context variable from the list. For further information, see
    Talend Studio User Guide    .

Note that when parallel execution is enabled, it is not possible to use global
variables to retrieve return values in a subjob.

  • The Action on
    table     field is not available with the
    parallelization function. Therefore, you must use a tCreateTable component if you
    want to create a table.
  • When parallel execution is enabled, it is not
    possible to use global variables to retrieve return values in a
    subjob.

Global Variables

Global Variables 

NB_LINE: the number of rows processed. This is an After
variable and it returns an integer.

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

Related scenario

For a related scenario, see Retrieving modified data using CDC.

Document get from Talend https://help.talend.com
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Docs 7.x
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