Transformation Guide

Back Next

Lookup Transformation Values

The Lookup transformation contains values for input ports, the lookup, and output ports. If you enable a dynamic lookup cache, the output port values vary based on how you configure the dynamic lookup cache.

The Lookup transformation contains the following types of values:

Input value: Value that the Integration Service passes into the Lookup transformation.
Lookup value: Value that the Integration Service inserts into the cache.
Output value: Value that the Integration Service passes from the output port of the Lookup transformation. The output value of the lookup/output port depends on whether you choose to output old or new values when the Integration Service updates a row.

For example, the following Lookup transformation uses a dynamic lookup cache:

The mapping contains a source qualifier, a Lookup transformation, an Expression transformation, and a Router transformation. The source qualifier and the Lookup transformation are open to show port names and datatypes. The Expression transformation and the Router transformation are iconized.

For example, you create a mapping with the following objects:

Source > Lookup transformation > Expression transformation> Router transformation > Target

You enable dynamic lookup caching for the Lookup transformation.

You define the following lookup condition:

IN_CUST_ID = CUST_ID

By default, the row type of all rows entering the Lookup transformation is insert. To perform both inserts and updates in the cache and target table, you select the

Insert Else Update

property in the Lookup transformation.

The following sections describe the values of the rows in the cache, the input rows, the lookup rows, and the output rows as you run the session.

The following sections describe the values of the rows in the cache, the input rows, the lookup rows, and the output rows as you run the mapping.

Download Guide

Watch

Comments