Property type

Either Built-In or Repository.

Built-In: No property data stored centrally.

Repository: Select the repository file where the
properties are stored.

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.

API type

This drop-down list is displayed only when you have selected the 2.0 version of Cassandra
from the DB version list. From this API type list, you can either select Datastax to use CQL 3 (Cassandra Query Language) with Cassandra, or select
Hector to use CQL 2.

Note that the Hector API is deprecated for the 2.0 or
later version of Cassandra, but it is still available for use in the Studio so that you can
be flexible about the version of the query language to be used with Cassandra 2.0.0.

Host

Type in the IP address or hostname of the Cassandra server.

Port

Type in the listening port number of the Cassandra server.

Required Authentication

Select this check box to provide credentials for the Cassandra
authentication.

This check box appears only if you do not select the Use existing connection check box.

Username

Fill in this field with the username for the Cassandra
authentication.

Password

Fill in this field with the password for the Cassandra
authentication.

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.

Keyspace

Type in the name of the keyspace on which you want to execute the
CQL commands.

Column family

Name of the column family.

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. 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.

Query

Type in the CQL command to be executed.

By default, the query is not case-sensitive. This means that at runtime, the column names
you put in the query are always taken in lower case. If you need to make the query
case-sensitive, put the column names in double quotation marks.

Die on error

This check box is cleared by default, meaning to skip the row on
error and to complete the process for error-free rows.

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

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.

Limitation

Currently, the select commands
are not supported.