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Oracle TopLink Developer's Guide 10g Release 3 (10.1.3) B13593-01 |
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# Configuring Allowing Null Values

If all the fields in the database row for the aggregate object are `null`, then, by default, TopLink places `null` in the appropriate source object, as opposed to filling an aggregate object with `null` values.

## Using TopLink Workbench

To allow a mapping to contain a null value, use this procedure.

1. Select the mapped attribute in the Navigator. Its properties appear in the Editor.

2. Click the General tab. The General tab appears.

   Figure 47-1 General Tab, Allow Null Option

   Description of "Figure 47-1 General Tab, Allow Null Option"

Select the Allows Null option to allow this mapping to contain a null value.