Data Transformation Engine Map Designer Reference Guide

Chapter 5 - Card Settings SourceRule Input Card Settings
Map Designer Reference Guide
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FetchUnit with Multiple Input Cards
In a case where more than one input card in a map references the same data
object, the values of the FetchAs and FetchUnit card settings must be the same
on all cards that reference that data object.
Only one instance of the type tree component structure is stored with the
compiled map, therefore the card settings that control that component structure
must be the same on all cards using that data object. The type tree component
structure stored with the map has one number that represents the maximum
instances of that component. The FetchUnit setting changes this number.
For example, a map contains two input cards that both reference the ContactFile
data object. This data object may be the card object (as specified with the
TypeTree (Contact.MTT) and Type (ContactFile Data settings, as shown
below) or may be a component of the card object.
To achieve desired data retrieval results, you must set the FetchAs and
FetchUnit values the same on both cards that use the same type (ContactFile).
If different FetchAs and FetchUnit values are specified for the same data object
on two different input cards in the same map, the FetchAs and FetchUnit values
specified in the first card are used.
GET
The GET settings define all of the input data settings.
Source
The Source card setting identifies the source of the input data. The data may be
in a file, from a specific application, in a database, from a message queue, or from
other possible sources. Defining the adapter source specifies where to go to get
the data and specifics on which data to get.
The meaning of the various adapter source settings is specific to the adapter being
used to get the input data.