IRdsAttribute.DefaultExpression

Syntax

DefaultExpression: IExpression;

Description

The DefaultExpression property determines an expression by which default attribute value is determined.

Comments

For expression as symbol string use the property IExpression.AsString.

Example

Executing the example requires that the repository contains a table MDM dictionary with the ATTRIBUTED identifier.

Add links to the Dal, Metabase and Rds system assemblies.

Sub UserProc;
Var
    mb: IMetabase;
    Dict: IRdsDictionary;
    Attributes: IRdsAttributes;
    Attribute: IRdsAttribute;
    Exp: IExpression;
Begin
    // Get current repository
    mb := MetabaseClass.Active;
    // Get MDM dictionary
    Dict := mb.ItemById("ATTRIBUTED").Edit As IRdsDictionary;
    // Get dictionary attributes
    Attributes := Dict.Attributes;
    // Add a new attribute
    Attribute := Attributes.Add;
    // Set name and data type of attribute
    Attribute.Name := "New attribute";
    Attribute.DataType := DbDataType.String;
    // Set possibility to edit attribute value
    Attribute.VisibleForEdit := TriState.OnOption;
    // Set default value
    Exp := Attribute.DefaultExpression;
    Exp.AsString := "NAME";
    // Set calculation of default value each time when changing the element
    Attribute.DefaultExpressionKind := RdsAttributeDefaultExpressionKind.EvaluateOnEdit;
    // Save changes in the MDM dictionary
    (Dict As IMetabaseObject).Save;
End Sub UserProc;

After executing the example, the attribute is added to the dictionary and the expression to calculate it default value is set. Value will be calculated each time on changing element.