[fdo-internals] Zero-length Data Properties

[Traian Stanev]

In this case -1 means "limited by available system resources", which is also not easy to determine.

Traian



> -----Original Message-----
> From: fdo-internals-bounces at lists.osgeo.org [mailto:fdo-internals-
> bounces at lists.osgeo.org] On Behalf Of Jackie C. Ng
> Sent: Tuesday, September 02, 2008 11:05 AM
> To: fdo-internals at lists.osgeo.org
> Subject: RE: [fdo-internals] Zero-length Data Properties
>
>
> Thomas,
>
> But for something like SDF, even it returns -1 for string/BLOB/CLOB. It
> is a
> fixed format with fixed specifications. What is the deal there?
>
> - Jackie
>
>
> Thomas Knoell wrote:
> >
> > Hi Jackie,
> >
> > The -1 is an indicator that the exact value cannot be determined.
> This is
> > especially the case in ODBC that can connect to multiple data store
> > sources, all with different limitations. Because the capability
> > information is available before a connection is actually established
> more
> > precise information cannot be provided.
> >
> > Thanks
> >
> >   Thomas
> >
> > -----Original Message-----
> > From: fdo-internals-bounces at lists.osgeo.org
> > [mailto:fdo-internals-bounces at lists.osgeo.org] On Behalf Of Jackie C.
> Ng
> > Sent: Tuesday, September 02, 2008 4:47 AM
> > To: fdo-internals at lists.osgeo.org
> > Subject: [fdo-internals] Zero-length Data Properties
> >
> >
> > Hi All,
> >
> > I have two related questions about Data Properties
> >
> > A) Why does FDO allow zero-length string/CLOB/BLOB data properties?
> In my
> > feeble little mind, zero-length strings/CLOBs/BLOBs makes no sense
> > whatsoever.
> >
> > B) I noticed that for some providers, the GetMaximumDataValueLength()
> > method
> > returns -1 for string/BLOB/CLOB properties. The same goes for
> > GetMaximumDecimalPrecision() and GetMaximumPrecisionScale(). If I
> were to
> > do
> > something like this:
> >
> > ISchemaCapabilities capabilities;
> > ...
> > DataPropertyDefinition def = new DataPropertyDefinition("StringProp",
> "");
> > def.Length =
> > capabilities.GetMaximumDataValueLength(DataType.DataType_String);
> >
> > It would throw an exception because the Length property of
> > DataPropertyDefinition can't be negative. So what should this value
> (-1)
> > be
> > interpreted as?
> >
> > - Jackie
> >
> > -----
> > http://themapguyde.blogspot.com
> >
> > http://www.linkedin.com/in/jackieng
> > --
> > View this message in context:
> > http://www.nabble.com/Zero-length-Data-Properties-
> tp19266363p19266363.html
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> >
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>
> -----
> http://themapguyde.blogspot.com
>
> http://www.linkedin.com/in/jackieng
> --
> View this message in context: http://www.nabble.com/Zero-length-Data-
> Properties-tp19266363p19271951.html
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>
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