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Re: Using BigInteger as argument to AbstractJdbc2Statement.setObject

From: Oliver Jowett <oliver(at)opencloud(dot)com>
To: Sylvain Leroux <sl20(at)wanadoo(dot)fr>
Cc: pgsql-jdbc(at)postgresql(dot)org
Subject: Re: Using BigInteger as argument to AbstractJdbc2Statement.setObject
Date: 2009-08-05 13:17:54
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-jdbc
Sylvain Leroux wrote:
> Hi,
> and first of all, thanks for your answer.
> Oliver Jowett a écrit :
>> Why NUMERIC instead of an integer type?
>> Might as well make setBigInteger() private if you're not also going to
>> expose it on PGStatement (I don't think it needs to be exposed there)
> According to the JDK doc, java.math.BigInteger provides
> "arbitrary-precision integers".
> The closest match will be NUMERIC since it allows up to 1000 digits. As
> far as I know, the integer types have much narrower range.
> *Or* could it be required to inspect the BigInteger in order to use the
> most appropriate type? But, I don't see any benefits here: it appears
> not to be a problem to send a NUMERIC value for an INTEGER column - as
> far as the value is in the supported range.

But there's no implicit cast from NUMERIC to integer types, is there?
(It'd lose precision)

> oliver=# CREATE OR REPLACE FUNCTION test_numeric(int4) RETURNS int4 AS 'SELECT $1' LANGUAGE SQL;
> oliver=# PREPARE s1(int4) AS SELECT test_numeric($1);
> oliver=# PREPARE s2(numeric) AS SELECT test_numeric($1);
> ERROR:  function test_numeric(numeric) does not exist
> LINE 1: PREPARE s2(numeric) AS SELECT test_numeric($1);
>                                       ^
> HINT:  No function matches the given name and argument types. You might need to add explicit type casts.

So my concern with mapping Jython integer value -> BigInteger -> NUMERIC
is that you end up with a statement parameter that's not actually an
integer, and so "stmt.setObject(1,1234567899999)" will fail in cases
where you would expect an integer value to work.

Selecting a target type based on the magnitude of the parameter value
passed may work better; then at least you get obvious behavior for cases
where the value can fit in an integer.


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