Обсуждение: PostGIS/ PostGreSQL ODBC problem

Hi all,

I am using the PostGIS to do research. Here I think that I found a bug with=
 PostGreSQL / PostGIS.
PostgreSQL 7.1.3/ PostGIS 0.6.2

There is a function called "Astext" in PostGIS, defined as below.
    -- Function: astext(geometry)
    CREATE FUNCTION "astext"("geometry") RETURNS "text" AS 'astext_geometry=
' LANGUAGE 'C' WITH (ISSTRICT);

When I used this function to return a geometry column, everything is OK if =
the result was less than 8190.
I used the ODBC to get the ADO RecordSet.  The DefinedSize of the field "as=
text" is 8190.=20=20

Does this the PostgreSQL's ODBC problem?  If the ODBC can not get the field=
's size, would it give the size of 8190?
Or this is the PostGIS's problem?


Best regards,
Tony

---
Tony Jiang, MSc
Research & Development Programmer/Analyst
MRF Geosystems Corp (www.mrf.com)
Suite 700, 665 8th Street SW,=20
Calgary, AB T2P 3K7
(403) 216-5515 ext:226

> "TONY J.Y." wrote:
>
> Hi all,
>
> I am using the PostGIS to do research. Here I think that I found a bug
> with PostGreSQL / PostGIS.
> PostgreSQL 7.1.3/ PostGIS 0.6.2
>
> There is a function called "Astext" in PostGIS, defined as below.
>     -- Function: astext(geometry)
>     CREATE FUNCTION "astext"("geometry") RETURNS "text" AS
> 'astext_geometry' LANGUAGE 'C' WITH (ISSTRICT);
> When I used this function to return a geometry column, everything is
> OK if the result was less than 8190.
> I used the ODBC to get the ADO RecordSet.  The DefinedSize of the
> field "astext" is 8190.
>
> Does this the PostgreSQL's ODBC problem?  If the ODBC can not get the
> field's size, would it give the size of 8190?

Are you using the psqlodbc driver whose version >= 7.01.0006 ?
If so you could increase the size(8190) by setting MaxLongVarChar
driver option using ODBC DataSource Administarator.
You may be able to set the size to 0(unlimited?).

regards,
Hiroshi Inoue