[ psqlodbc-Bugs-1010731 ] Incorrect info for varchar(255), text columns

Bugs item #1010731, was opened at 2009-11-18 20:55
You can respond by visiting:
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 3
Submitted By: Farid Zidan (faridz)
Assigned to: Nobody (None)
Summary: Incorrect info for varchar(255), text columns

Initial Comment:
PostgreSQL ANSI ODBC driver 8.04.01 returns incorrect info for
SQLColAttribute SQL_DESC_TYPE and/or SQL_DESC_OCTET_LENGTH

Example,
create table test_varchar(col1 varchar(20), col2 varchar(255), col3 text);

I get the following information from SQLColAttribute:
column SQL_DESC_TYPE SQL_DESC_OCTET_LENGTH
col1 SQL_VARCHAR 20
col2 SQL_LONGVARCHAR 255
col3 SQL_LONGVARCHAR 8190

col1 info is correct.
col2 SQL_DESC_TYPE should be SQL_VARCHAR not SQL_LONGVARCHAR.
col3 SQL_DESC_OCTET_LENGTH should be something large such as 2147483647 (2**31 -1)

Attached is screenshot of the Firebird vs PostgreSQL ODBC driver results for the test table above (MS SQL Server ODBC driver returns the same info as the Firebird ODBC driver)

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Comment By: Richard Broersma (rabroersma)
Date: 2009-11-18 21:21

Message:
I have one thought that might be unrelated to your problem:

Notice the ODBC driver setting for Max LongVarChar.

http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/~checkout~/psqlo dbc/psqlodbc/docs/config.html?rev=1.10&content-type=text/htm l

I wonder if the ODBC driver is masking the actual size that a TEXT column could be?

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