August 16, 2023

tPostgresqlValidRows – Docs for ESB 6.x

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tPostgresqlValidRows

Extracts DB rows that match a given data quality pattern.

The tPostgresqlValidRows checks
database rows against specific Data Quality patterns (regular expression).

tPostgresqlValidRows Standard properties

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

The Standard
tPostgresqlValidRows component belongs to the Data Quality and the Databases families.

This component is available in the Palette of the Studio only if you have subscribed to one of the Talend Platform products.

Basic settings

Validation type

Either Regex pattern
validation or DQ rule
validation.

  • Regex pattern
    validation    : Validate data in the database against
    regex patterns.

  • DQ rule validation: Validate
    data in the database against DQ rules.

Regex pattern validation

  • Analyzed column: select from the
    schema list the column to analyze.

  • Custom pattern: select this check box to
    define manually your own customized regular expression against
    which you want to check the DB rows.

  • Patterns list: select from the pattern
    list the pattern against which you want to check the DB
    rows.

DQ rule validation

  • DQ rule list: select from the list the
    rule against which you want to check the DB rows.

  • Query type: Either
    Built-in or
    Repository.

    1. Built-in: fill in manually the
      query statement or build it graphically using
      SQLBuilder.
    2. Repository: select the relevant
      query stored in the Repository.
      The Query field is filled in accordingly.

  • Guess query: click the Guess Querry button to
    generate the query which corresponds to your table schema in
    the Query field.

  • Guess schema: click the
    Guess Schema button to retrieve the
    schema from the table.

  • Query: enter your DB query paying
    particular attention to properly sequence the fields in
    order to match the schema definition.

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.

Use 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.

DB Version

List of database versions.

Host

Database server IP address.

Port

Listening port number of DB server.

Database

Name of the database.

Postgresql schema

Name of the Postgresql 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 and Edit
Schema

A schema is a row description, it defines the number of fields to
be processed and passed on to the next component. The schema is
either Built-in or stored remotely
in the Repository.

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.

 

Built-in: You create and store
the schema locally for this component only. Related topic: see

Talend Studio User
Guide.

 

Repository: You have already
created the schema and stored it in the Repository and thus reuse it
when needed. Related topic: see
Talend Studio User
Guide.

Table Name

Enter the name of the table to be read.

Where clause

Enter a WHERE clause to define a row filter on the table.

You can use the WHERE clause to filter the rows you want to
analyze in the table. This WHERE clause enables you then to retrieve
valid and invalid data that match certain specified criteria or
conditions.

Advanced settings

Use cursor

Select this check box to specify the number of rows you want to
work with at a given time. This option optimises performance.

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 the defined
columns.

This check box is not visible if Trim all
the String/Char columns is selected. Clear Trim all the String/Char columns to
enable Trim column.

tStatCatcher Statistics

Select this check box to collect log data at the 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
integer.

QUERY: the query statement being processed. This is a Flow
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 start or intermediary step. It
requires an output flow.

Dynamic settings

Click the [+] button to add a
row in the table and fill the Code field
with a context variable to choose your database connection dynamically from
multiple connections planned in your Job. This feature is useful when you
need to access database tables having the same data structure but in
different databases, especially when you are working in an environment where
you cannot change your Job settings, for example, when your Job has to be
deployed and executed independent of
Talend Studio
.

The Dynamic settings table is
available only when the Use an existing
connection check box is selected in the Basic settings view. Once a dynamic parameter is
defined, the Component List box in the
Basic settings view becomes unusable.

For examples on using dynamic parameters, see Scenario: Reading data from databases through context-based dynamic connections and Scenario: Reading data from different MySQL databases using dynamically loaded connection parameters. For more information on Dynamic
settings and context variables, see
Talend Studio User Guide.

Document get from Talend https://help.talend.com
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Docs 6.x
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