tAmazonAuroraInput – Docs for ESB 5.x

Component family

Cloud/AmazonRDS/Aurora

Function

This component reads an Amazon Aurora database and extracts fields
based on a query.

Purpose

This component executes a database 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 Row > Main
link.

Basic settings

Property Type

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.

Built-In: No property data stored
centrally.

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

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.

Host

Type in the IP address or hostname of the Amazon Aurora
database.

Port

Type in the listening port number of the Amazon Aurora
database.

Database

Type in the name of the database you want to use.

Username and
Password

Type in the database 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.

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.

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. You can reuse it in various projects and Job designs. Related
topic: see Talend Studio User Guide.

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

Table Name

Type in the name of the table to be read.

Query Type and Query

Enter the database query paying particularly attention to the
proper sequence of the fields in order to match the schema
definition.

Guess Query

Click the button to generate the query which corresponds to the
table schema in the Query
field.

Guess schema

Click the button to retrieve the schema from the table.

Specify a data source alias

Select this check box and specify the alias of a data source created on the Talend Runtime side to use the shared connection pool defined in the data source configuration.
This option works only when you deploy and run your Job in Talend Runtime.

This check box disappears when the Use an
existing connection check box is selected.

Data source alias

Type in the alias of the data source created on the Talend Runtime side.

This field appears only when the Specify a
data source alias check box is selected.

Advanced settings

Additional JDBC parameters

Specify additional connection properties for the database
connection you are creating. When you need to handle data of the
time-stamp type 0000-00-00 00:00:00 using this
component, set the parameter to
noDatetimeStringSync=true&zeroDa­teTimeBehavior=convertToNull.

This field disappears when the Use an
existing connection check box in the Basic settings view is selected.

Enable stream

Select this check box to enable streaming over buffering which
allows the code to read from a large table without consuming a large
amount of memory in order to optimize the 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

Select the check box(es) in the Trim column to remove leading and trailing
whitespace from the corresponding column(s).

This option disappears when the Trim all the
String/Char columns check box is selected.

tStatCatcher Statistics

Select this check box to gather the Job processing metadata at the
Job level as well as at each component level.

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 more information on Dynamic settings and context
variables, see Talend Studio User Guide.

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 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.

Usage

This component is usually used as a start component of a Job or
Subjob and it needs an output link.

Log4j

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.