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Re: Filtering out commas for DOUBLE

From: Kris Jurka <books(at)ejurka(dot)com>
To: Chris Gamache <cgamache(at)gmail(dot)com>
Cc: pgsql-jdbc(at)postgresql(dot)org
Subject: Re: Filtering out commas for DOUBLE
Date: 2008-03-05 23:34:52
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-jdbc

On Tue, 4 Mar 2008, Chris Gamache wrote:

> I was having a problem with JDBC expecting a DOUBLE from a PostgreSQL
> function which returnes "money" ... My first inclination was to return
> an OTHER, but PgJDBC balks that it expects java.sql.Types=8 (DOUBLE)
> but I set it to 1111 (OTHER) ... There was (seemingly) no way around
> that.

Someone else was just complainging about this recently:

> So, I decided to attack the root of the problem: PostgreSQL is
> returning "1,234.00" when it is executing the function that returns
> money and JDBC won't budge on it's expectation that it should be
> DOUBLE. The comma in the return string is confusing
> Double.parseDouble, so I filter out the commas before parseDouble is
> called. My hack got me over the hump, but it makes me uneasy to apply
> this patch to a codebase that I am not intimately familiar with. Can
> you propose a different way around this problem, a more complete
> patch, or the blessing that this will not adversely affect the normal
> function of the driver?

That's one approach, but you'd also have to apply it to other getXXX 
methods if you really wanted to be able to treat money as a numeric type. 
On the previous thread I was advocating taking this special case code out 
of the common path instead of adding more.  That seemed to be your first 
inclination as well (wanting to get back Types.OTHER).

>                s = s.replace(",",""); //filter out the commas

Your actual implementation is using a JDK 1.5 method while the driver 
(probably unnecessarily) supports back to 1.2.  So this may work for your 
environment, but isn't a general solution.  Other than that it looks fine 
as long as you aren't concerned that values like "1,,,,,0" will no be 
considered valid doubles.

Kris Jurka

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