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Re: possible ODBC bug with '-infinity'

From: Andrei Kovalevski <andyk(at)commandprompt(dot)com>
To: Richard Broersma Jr <rabroersma(at)yahoo(dot)com>
Cc: Postgresql ODBC List <pgsql-odbc(at)postgresql(dot)org>
Subject: Re: possible ODBC bug with '-infinity'
Date: 2008-01-03 16:33:35
Message-ID: 477D0E5F.9040705@commandprompt.com (view raw or flat)
Thread:
Lists: pgsql-odbc
Hello, Happy New Year!

Richard Broersma Jr wrote:
> --- On Mon, 12/3/07, Andrei Kovalevski <andyk(at)commandprompt(dot)com> wrote:
>
>   
>> Are you sure these values are equal? Try this in PgAdmin:
>>
>> create table t (t timestamp);
>> insert into t values ('-infinity');
>> insert into t values ('infinity');
>> insert into t values ('9999-12-31 23:59:59');
>> insert into t values ('5874897-12-31 23:59:59');
>> insert into t values ('5874897-12-31
>> 23:59:59.999999999');
>> --insert into t values ('5874898-01-01 00:00:00');
>> select t::date, t::time, t::timestamp, t::varchar from t;
>>     
>
> Now the real question is, "What does and ODBC client do with these value?".
>
> Also, don't forget to include values for -infinity and other timestamps that are smaller than what the client side application can display.
>   

ODBC supports dates and timestamps as:
    typedef struct tagTIMESTAMP_STRUCT
    {
        SQLSMALLINT    year;
        ..........
    } TIMESTAMP_STRUCT;

So, it can't show dates bigger then 32,767 or smaller then -32,768.

I think - correct driver behavour should be:
1) driver returns NULL value for SQL_DATE_STRUCT and SQL_TIMESTAMP_STRUCT
2) function return value should be SQL_SUCCESS_WITH_INFO;
3) driver also sets Informative Description for this error with actual 
value - if possible.

-- 
Andrei Kovalevski
PostgreSQL Replication, Consulting, Custom Development, 24x7 support
Managed Services, Shared and Dedicated Hosting
Co-Authors: plPHP, ODBCng - http://www.commandprompt.com/


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