Developer Transformation Guide

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Default Values for Ports

All transformations use default values that determine how the Integration Service handles input null values and output transformation errors.

Input, output, and input/output ports have a system default value that you can sometimes override with a user-defined default value. Default values have different functions in different types of ports:

Input port.
The system default value for null input ports is NULL. The default value appears as a blank in the transformation. If an input value is NULL, the Integration Service leaves it as NULL.

Output port.
The system default value for output transformation errors is ERROR. The default value appears in the transformation as ERROR(‘transformation error’). If a transformation error occurs, the Integration Service skips the row. The Integration Service notes all input rows that the ERROR function skips in the log file.

The following errors are transformation errors:

Data conversion errors, such as passing a number to a date function.

Expression evaluation errors, such as dividing by zero.

Calls to an ERROR function.

Pass-through port.
The system default value for null input is the same as input ports, NULL. The system default value appears as a blank in the transformation. The default value for output transformation errors is the same as output ports. The default value for output transformation errors does not display in the transformation.

The Java Transformation converts PowerCenter® datatypes to Java datatypes, based on the Java Transformation port type. Default values for null input differ based on the Java datatype.

The following table shows the system default values for ports in connected transformations:

Port Type	Default Value	Integration Service Behavior	User-Defined Default Value Supported
Input, Pass-through	NULL	Integration Service passes all input null values as NULL.	Input, Input/Output
Output, Pass-through	ERROR	Integration Service calls the ERROR function for output port transformation errors. The Integration Service skips rows with errors and writes the input data and the error message in the log file.	Output

Variable ports do not support default values. The Integration Service initializes variable ports according to the datatype.

You can override some of the default values to change the Integration Service behavior when it encounters null input values and output transformation errors.

Introduction to Transformations

User-Defined Default Values

User-Defined Default Input Values

Default Value Validation

User-Defined Default Output Values

General Rules for Default Values

Default Value Validation

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