Question
CM Wang · Aug 15, 2017

How to get all the names of the classes which inherits %Persistent

#Object Data Model #Caché

I want to retrieve all the names of classes which are %Persistent in a namespace by COS.

Any suggestion, Thanks.

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Discussion (8)1
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Jeffrey Semmens · Aug 15, 2017

Programmatically you can use the SubclassOf() query in the %Dictionary.ClassDefinitionQuery class. Pass in %Persistent and the flag for non-system classes.

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CM Wang · Aug 15, 2017

It seems like any classes defined in %SYS would also returned by this method.

Any way to filter them out? Thanks.

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Jeffrey Semmens · Aug 15, 2017

You could then iterate through the returned classes and check to see which ones are marked "system" by opening up each definition. I seem to vaguely remember a way to do this with a query but I can't find it now.

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Eduard Lebedyuk · Aug 15, 2017

SQL join or is there something more elaborate?

SELECT cd.name
FROM %Dictionary.ClassDefinition cd
JOIN subclassofquery sq ON sq.Name = cd.Name
WHERE cd.System IS NULL
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Dan Pasco · Aug 15, 2017

SYSTEM is not a valid filter. That keyword allows the class compiler to organize classes into compile 'groups' so that a class that may depend on another class at compile time is guaranteed to have the dependency resolved.

It isn't an indicator that the class originated in %SYS/%CACHELIB.

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John Murray · Aug 17, 2017

I have just posted an article here about how to determine whether a class is mapped.

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