Designer Guide

10.5.6
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Step 1. Create a Mapping Variable

You can create a mapping variable for any mapping or mapplet. You can create as many variables as you need. Once created, use the variable in the mapping or mapplet.

To create a mapping variable:

In the Mapping Designer, click Mappings > Parameters and Variables. Or, in the Mapplet Designer, click Mapplet > Parameters and Variables.

Click the Add button.

Specify the variable information.

The following table describes the options on the Declare Parameters and Variables dialog box:

Field	Required/ Optional	Description
Name	Required	Variable name. Name variables $$VariableName . The syntax for the variable name must be $$ followed by any alphanumeric or underscore characters.
Type	Required	Variable or parameter. Select Variable.
Datatype	Required	Datatype of the variable. Select a valid transformation datatype. Use any datatype except Binary. The datatype you select can affect the Aggregation type you can select. For example, when you create a String variable, you cannot configure it with a Count aggregation type.
Precision or Scale	Required	Precision and scale of the variable.
Aggregation	Required	Aggregation type of the variable. Determines the type of calculation you can perform with the variable. Set the aggregation to Count if you want to use the mapping variable to count number of rows read from source. Set the aggregation to Max if you want to use the mapping variable to determine a maximum value from a group of values. Set the aggregation to Min if you want to use the mapping variable to determine a minimum value from a group of values.
IsExprVar	Required	Determines how the Integration Service expands the variable in an expression string. If true, the Integration Service expands the variable before parsing the expression. If false, the Integration Service expands the variable after parsing the expression. Default is false. If you set this field to true, you must set the variable datatype to String, or the Integration Service fails the session.
Initial Value	Optional	Initial value of the variable. The Integration Service uses this value for the variable when the variable value is not saved in the repository or defined in the parameter file. If this value is also undefined, the Integration Service uses a default value based on the datatype of the mapping variable. Use any of the following formats for initial values for datetime variables: MM/DD/RR MM/DD/RR HH24:MI:SS MM/DD/YYYY MM/DD/YYYY HH24:MI:SS.US
Description	Optional	Description associated with the variable.

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Designer Guide

Designer Guide

Step 1. Create a Mapping Variable

Step 1. Create a Mapping Variable