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.
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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
Expand the node of the table to which you want to add a condition.
Click Add a Condition.
The field becomes a drop-down list that displays the available columns in the table.
Select a column from the list.
The Column field now displays When <column_name>.
Select an operator from the Operator field.
Type or select the condition value in the Value/Property field.
To delete a condition
Click the Column field of the condition you want to remove.
The field becomes a drop-down list.
Select <Delete>.