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Component family
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Databases/Informix
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Function
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tInformixInput reads a database
and extracts fields based on a query.
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Purpose
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tInformixInput 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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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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DB server
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Name of the database server
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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.
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: You create and store the schema locally for this
component only. Related topic: see Talend Studio
User Guide.
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Repository: You have already created the schema and
stored it in the Repository. You can reuse it in various projects and Job designs. Related
topic: see Talend Studio User Guide.
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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.
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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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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 processed. 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.
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.
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Usage
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This component covers all possible SQL queries for DB2
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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Limitation
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This component requires installation of its related jar files. For more information about the
installation of these missing jar files, see the section describing how to configure the
Studio of the Talend Installation and Upgrade Guide.
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