Initial vale in a Query for Transient Query

Question

I need to set the value of a transient attribute of my view object when when query execute. PorDesc = 1-(NewPrice/OldPrice*100).
how can i do it? how can i set value in a query execution of the viewObject?
my jdeveloper version is 11.1.2.3
<ViewAttribute
Name="ProdNum"
PrecisionRule="true"
EntityAttrName="ProdNum"
EntityUsage="eoProductos"
AliasName="PROD_NUM"/>
<ViewAttribute
Name="OldPrice"
PrecisionRule="true"
EntityAttrName="OldPrice"
EntityUsage="ListaPrecioDetalle"
AliasName="OLD_PRICE">
<Properties>
<SchemaBasedProperties>
<LABEL
ResId="model.vo.voListaPrecioDetalle.PrecioLista_LABEL"/>
</SchemaBasedProperties>
</Properties>
</ViewAttribute>
<ViewAttribute
Name="NewPrice"
PrecisionRule="true"
EntityAttrName="NewPrice"
EntityUsage="ListaPrecioDetalle"
AliasName="NEWPRICE">
<Properties>
<SchemaBasedProperties>
<LABEL
ResId="model.vo.voListaPrecioDetalle.Precio_LABEL"/>
</SchemaBasedProperties>
</Properties>
</ViewAttribute>
<ViewAttribute
Name="PorDesc"
IsQueriable="false"
IsPersistent="false"
PrecisionRule="true"
EntityAttrName="PorDesc"
EntityUsage="PrecioDetalle"
AliasName="$none$">
<Properties>
<SchemaBasedProperties>
<LABEL
ResId="model.vo.voListaPrecioDetalle.PorDesc_LABEL"/>
</SchemaBasedProperties>
</Properties>
</ViewAttribute>

Answer 1

Hi.
In the VO editor, click on your transient attribute. In the « details » tab, go to the « default value » section and select the « expression » radio button. Click the pen icon, and type 1-(NewPrice/OldPrice*100) as the expression (NewPrice and OldPrice must be the attribute names). At the bottom of the dialog, select NewPrice and OldPrice as the dependent attributes, which will ensure proper integrity for the value of the transient attribute.
Best Regards,
Frédéric.