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Re: Automatic cast

From: Kris Jurka <books(at)ejurka(dot)com>
To: Alexandre de Arruda Paes <adaldeia(at)gmail(dot)com>
Cc: pgsql-jdbc(at)postgresql(dot)org
Subject: Re: Automatic cast
Date: 2006-05-18 22:21:56
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-jdbc

On Thu, 18 May 2006, Alexandre de Arruda Paes wrote:

> I have a problem and I want know if this can be solved in the jdbc driver.
> Our company develop softwares  using a CASE Tool caled Genexus. The
> SQL sintaxe are not changeable and they have a big problem: the querys
> aren't casted.
> SELECT field from table where field=10
> If the field are int2 or int8, PostgreSQL don't use indexes (its
> converts the value 10 to int4).

This should work fine in 8.0 and up when cross type index access was 
added.  If you're not using 8.0+ consider an upgrade.  If you are using 
8.0+ please provide more details about your problem.

> Can I put an implicit (automatic) cast (' ' - apostrofes)  in the SQL
> sintaxes passed throught JDBC ???

You can write:
SELECT field FROM table WHERE field = ?::int8


SELECT field FROM table WHERE field = CAST(? AS int8);

Kris Jurka

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