Re: [dtp-dev] SQL Model Question - Column Data Types

[Hemant S Kolwalkar <hskolwal@xxxxxxxxxx>]

Hi Rob,

referenceType returns UserDefinedType and containedType
returns SQLDataType(superclass of PredefinedDataType). both referenceType
and containedType are XOR.

DataType is superclass of SQLDataType and UserDefinedDataType.
the convenience method get/setDataType 
on Column wraps both referenceType and containedType
so that the user can only think it terms of DataType 
when manipulating datatype of a column.

pl refer TypedElement diagram in Schema package.

hope that helps,

- Hemant

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09/07/2006 05:32 PM

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Subject	[dtp-dev] SQL Model Question - Column Data Types

Hey all,

I've got another SQL model question.

In the column element, what is the distinction between DataType,
ReferenceType and ContainedType?

My assumption would be that the ReferenceType should be a
ReferenceDataType, ContainedType would be a PredefinedDataType and DataType
would be a UserDefinedDataType?  However, ReferenceType is a
UserDefinedType, which is not a parent of ReferenceDataType;  ContainedType
could be either a ReferenceDataType or a PredefinedDataType; and DataType
could be any of the three.

Thanks in advance for any insight.

Rob

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