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SQLGetTypeInfo does not return COLUMN_SIZE

From: "Martin J(dot) Evans" <bohica(at)ntlworld(dot)com>
To: pgsql-odbc(at)postgresql(dot)org
Subject: SQLGetTypeInfo does not return COLUMN_SIZE
Date: 2013-10-04 17:01:09
Message-ID: 524EF455.6050409@ntlworld.com (view raw or flat)
Thread:
Lists: pgsql-odbc
I may have discovered an issue with the postgres ODBC Driver.

Postgres ODBC Driver version:
perl -MDBI -le 'my $h = DBI->connect; print $h->get_info(7);'
09.00.0310

Platform: Linux, Ubuntu

I maintain Perl DBD::ODBC and the test suite shows a problem because when calling SQLGetTypeInfo some types return

'CREATE_PARAMS' => 'max. length'

but then the COLUMN_SIZE is missing. e.g.:

$VAR1 = {
           'UNSIGNED_ATTRIBUTE' => undef,
           'MAXIMUM_SCALE' => undef,
           'INTERVAL_PRECISION' => '0',
           'CREATE_PARAMS' => 'max. length',
           'NUM_PREC_RADIX' => undef,
           'PRECISION' => 255,
           'SEARCHABLE' => '3',
           'MONEY' => '0',
           'AUTO_INCREMENT' => undef,
           'LOCAL_TYPE_NAME' => undef,
           'LITERAL_PREFIX' => '\'',
           'MINIMUM_SCALE' => undef,
           'TYPE_NAME' => 'varchar',
           'NULLABLE' => '1',
           'DATA_TYPE' => 12,
           'SQL_DATA_TYPE' => '12',
           'LITERAL_SUFFIX' => '\'',
           'CASE_SENSITIVE' => '1',
           'SQL_DATETIME_SUB' => undef
         };

See http://msdn.microsoft.com/en-us/library/ms714632%28v=vs.85%29.aspx where COLUMN_SIZE was introduced in ODBC 2 (decades ago) and should exist in the columns returned. Without it, the application cannot know what to put in varchar (size_here) after a column in a create table.

I've put in a special case for now to work around this problem but it issues a warning too. If you need anything further from me please let me know.

Martin


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