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Component family
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Databases/ PostgresPlus
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Function
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tPostgresPlusInput reads a
database and extracts fields based on a query.
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Purpose
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tPostgresPlusInput executes a DB
query with a strictly defined order which must correspond to the
schema definition. Then it passes on the field list to the next
component via a Main row link.
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Basic settings
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Property type
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Either Built-in or
Repository.
Since version 5.6, both the Built-In mode and the Repository mode are
available in any of the Talend solutions.
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Built-in: No property data stored
centrally.
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Repository: Select the repository
file in which the properties are stored. The fields that follow are
completed automatically using the data retrieved.
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Click this icon to open a database connection wizard and store the
database connection parameters you set in the component Basic settings view.
For more information about setting up and storing database
connection parameters, see Talend Studio User Guide.
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Use an existing connection
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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:
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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.
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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.
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DB Version
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List of database versions.
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Host
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Database server IP address.
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Port
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Listening port number of DB server.
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Database
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Name of the database.
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Schema
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Exact name of the schema.
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Username and
Password
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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.
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Schema and Edit
Schema
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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.
Since version 5.6, both the Built-In mode and the Repository mode are
available in any of the Talend solutions.
Click Edit schema to make changes to the schema. If the
current schema is of the Repository type, three options are
available:
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View schema: choose this option to view the
schema only.
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Change to built-in property: choose this option
to change the schema to Built-in for local
changes.
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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.
This component offers the advantage of the dynamic schema feature. This allows you to
retrieve unknown columns from source files or to copy batches of columns from a source
without mapping each column individually. For further information about dynamic schemas,
see Talend Studio
User Guide.
This dynamic schema feature is designed for the purpose of retrieving unknown columns
of a table and is recommended to be used for this purpose only; it is not recommended
for the use of creating tables.
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Built-in: The schema is created
and stored locally for this component only. Related topic: see
Talend Studio User
Guide.
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Repository: The schema already
exists and is stored in the Repository, hence can be reused. Related
topic: see Talend Studio User
Guide.
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Table name
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Name of the table to be read.
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Query type and
Query
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Enter your DB query paying particularly attention to properly
sequence the fields in order to match the schema definition.
Warning
If using the dynamic schema feature, the
SELECT query must include the * wildcard, to retrieve all of the columns
from the table selected.
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Advanced settings
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Use cursor
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When selected, helps to decide the row set to work with at a time
and thus optimize performance.
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Trim all the String/Char columns
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Select this check box to remove leading and trailing whitespace
from all the String/Char columns.
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Trim column
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Remove leading and trailing whitespace from defined
columns.
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tStat
Catcher Statistics
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Select this check box to collect log data at the component
level.
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Dynamic settings
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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 more information on Dynamic settings and context
variables, see Talend Studio User Guide.
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Global Variables
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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 SQL query statement being processed. This is a
Flow variable and it returns a string.
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.
A Flow variable functions during the execution of a component while an After variable
functions after the execution of the component.
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Usage
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This component covers all possible SQL queries for Postgresql
databases.
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Log4j
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The activity of this component can be logged using the log4j feature. For more information on this feature, see Talend Studio User
Guide.
For more information on the log4j logging levels, see the Apache documentation at http://logging.apache.org/log4j/1.2/apidocs/org/apache/log4j/Level.html.
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