G Dimension: Formula in Map

Saturday, March 6, 2010

Formula in Map


  
    <key column="ITEM_ID"/>  
    <map-key type="string" column="IMAGENAME"/>  
      
         <property name="filename" column="FILENAME" not-null="true"/>  
         <property name="sizeX" column="SIZEX"/>  
         <property name="sizeY" column="SIZEY"/>

This has the drawback that the embedded component class (Image) doesn't have the property imageName which is the map key. It may be undesirable.


  
    <key column="ITEM_ID"/>  
    <map-key type="string" column="IMAGENAME"/>  
     
         <property name="name" type="string" formula="IMAGENAME"/>   
         <property name="filename" column="FILENAME" not-null="true"/>  
         <property name="sizeX" column="SIZEX"/>  
         <property name="sizeY" column="SIZEY"/>

In Hibernate 3.x, formula comes as a rescue here.

[Reference] Hibernate: how to map a collection of embedded components keyed by one of the component's properties?

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