tSetDynamicSchema – Docs for ESB 5.x

Component family

Custom Code

Function

tSetDynamicSchema allows you to
set a dynamic schema that can be reused by components in the
subsequent subjob or subjobs to retrieve data from unknown
columns.

Purpose

tSetDynamicSchema is used to
create a dynamic schema to allow components that are unable to guess
the structure of the data being handled based on field separators,
such as tFileInputPositional and
tFileOutputPositional, to
retrieve data from unknown columns.

Basic 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.

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:

This table contains two columns.

Property: Property of the schema
entry: ColumnName, DBName, Type, DBType,
Length, Precision, Nullable, or Key.

Value: Value assigned to this
property.

Advanced settings

tStatCatcher Statistics

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

Global Variables

DYNAMIC: the last row of the data retrieved using the
defined dynamic schema. This is an After variable and it returns a dynamic.

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 generally used as the end component in a
subjob.

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.

Limitation

This component always requires an input component to defines the
data structure to set into a dynamic schema.