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
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
(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.

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.

Repository: You have already created the schema and stored it in the
Repository. You can reuse it in various projects and Job designs.

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

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.

If using the dynamic schema feature, the SELECT query must
include the * wildcard, to retrieve
all of the columns from the table selected.

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.

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.

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 rule

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

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 Reading data from databases through context-based dynamic connections and 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.