Re: Query returned unhandled type 16411

[Richard Huxton <dev(at)archonet(dot)com>]

Roger Merritt wrote:
> Hi,
>
> I have tried several installs of postgresql-8.1.3-1 and postgresql-8.1.4-1,
> with psqlodbc-08_02_0002.zip and PgOleDb-1.0.0.20.zip.
>
> After each uninstall I delete the entire contents of the C:\Program
> Files\PostgreSQL directory.
>
> I am using VB6 SP6b.
>
> My 'Connection' string is:
> Provider=PostgreSQL OLE DB Provider;Password=xxxxxx;User ID=postgres;Data
> Source=127.0.0.1;Location=spatial;Extended Properties=""
>
> When the following code runs against a table with a geometry column I get
> the following error:
>
> Query returned unhandled type 16411

It looks like the odbc/ole-db drivers don't know anything about the 
geometry types. That's not terribly surprising, since I don't know of 
any MS-standard modeling polygons circles etc. as database objects. 
Presumably any custom types you design will have the same problem too.

Hmm - it's presumably non-trivial to add type handling for the Windows 
drivers without a C compiler and associated tools. Your best bet is to 
contact the odbc/ole-db mailing lists and see if they have any bright 
ideas. An option to handle unrecognised types as text could make sense.

It might be you can work-around the problem for the moment by accessing 
a view that does the cast-to-text for the geometry columns.

--
  Richard Huxton
  Archonet Ltd