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How to: Add or Delete Conditions (Entity Data Model Tools)

Conditions allow the mapping system to map a particular type in the hierarchy to or from rows in a table, based on the values of the selected condition columns. Entity types can define a set of conditions for each table to which they are mapped.

NoteNote

If an entity property maps to a particular column, that column cannot be used to create a condition. To delete the mapping of a property to a column, select the property in the Value/Property column of the Mapping Details window and select <Delete>.

The following table describes the fields in the Mapping Details window that are used to add a condition.

Name Description

Column

Contains an alphabetized list of all available columns. Columns that are already mapped in the entity are not displayed.

Operator

A drop-down list that provides two possible operators, = and Is.

Value/Property

If the Is operator is selected in the Operator field, the Value/Property field is a drop-down list with the values Null and Not Null.

If the column is a Boolean type and the = operator is selected in the Operator field, the Value/Property field is a drop-down list with the values True and False.

If the column is a String or Integer type and the = operator is selected in the Operator field, the Value/Property field is an editable text box.

To add a condition

  1. Expand the node of the table to which you want to add a condition.

  2. Click Add a Condition.

    The field becomes a drop-down list that displays the available columns in the table.

  3. Select a column from the list.

    The Column field now displays When <column_name>.

  4. Select an operator from the Operator field.

  5. Type or select the condition value in the Value/Property field.

To delete a condition

  1. Click the Column field of the condition you want to remove.

    The field becomes a drop-down list.

  2. Select <Delete>.

See Also

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