Re: (Update) Implicit smallint to boolean conversion? - Mailing list pgsql-general

Found the problem:

In org/postgresql/jdbc2/ResultSet.java

The following line determines true/false:

return ((c == 't') || (c == 'T'));

Changing this to:

return ((c == 't') || (c == 'T') || (c == '1'));

Fixes the problem.  This could probably be improved to:

return ((c == 't') || (c == 'T') || (c != '0'));

and in that way any result is 'true' and only '0' returns false (for SMALLINT).

Regards,
Brice Ruth

Brice Ruth wrote:
>
> Here's a code snippet that shows the problem:
>
> +--+
> boolean bNeuroPsych = objResults.getBoolean("NeuroPsych");
> short sNeuroPsych = objResults.getShort("NeuroPsych");
>
> System.out.println("Neurologic/Psychiatric: "+bNeuroPsych);
> System.out.println("Neurologic/Psychiatric: "+sNeuroPsych);
> +--+
>
> The "NeuroPsych" field is defined in PostgreSQL as a SMALLINT.  The
> following is printed out when the code above is run:
>
> Neurologic/Psychiatric: false
> Neurologic/Psychiatric: 1
>
> Apparently, Oracle, Sybase, SQL Server & Access treat a smallint of '1'
> as 'true' when returned from getBoolean().  Is this a bug in the driver
> for PostgreSQL?  Any help would be appreciated!
>
> See original message below for background & further details of the problem.
>
> TIA & Best Regards,
> Brice Ruth
>
> (Original Message)
> Greetings.
>
> I'm working with a third party product that is essentially a Java API to
> data housed in the database of your choice.  My choice is PostgreSQL in
> this case.  Access to the database is through JDBC, in this case,
> jdbc7.0-1.2.jar.  One of the API calls isn't returning the correct
> results to my application - so I turned to the vendor for help.  They've
> tested the call through JDBC to Access, Sybase, Oracle, and SQL Server
> and received the correct results.  So, the current thought is that
> something is wrong in the JDBC library provided for PostgreSQL.
>
> Here's what's happening:
>
> The table being queried has 'smallint' fields in it.  Apparently these
> fields will contain either 0 or 1, depending on if a condition is 'true'
> or 'false'.  So, when the API queries the database, it apparently
> expects that these smallint fields will be implicitly converted to
> boolean 'true/false' values in Java, which is what is then returned to
> the application calling into the API.  I don't know what Java code
> they're using - I've requested the relevant snippets.  I can provide the
> query that is being run by the API, I can provide the structure of the
> table used in the SQL CREATE statement, and I can provide an example of
> the data in a record that would be returned.  I won't paste all those
> things in this e-mail since I don't know if its necessary in this case -
> just let me know if it is.
>
> Any help or guidance on this issue would be greatly appreciated, as always.
>
> Sincerest regards & TIA,
> --
> Brice Ruth
> WebProjkt, Inc.
> VP, Director of Internet Technology
> http://www.webprojkt.com/

--
Brice Ruth
WebProjkt, Inc.
VP, Director of Internet Technology
http://www.webprojkt.com/