Re: JDBC question: Which class is returned?

At 20:30 12/10/2001 +0000, Dr. Evil wrote:

>I am doing some queries using JDBC.  I use the ResultSet.getObject()
>method to get the result object.  This works fine with SQL VARCHAR,
>etc, but there is a big problem when I try it with an INT4.
>
>For example:
>
>Object obj = result.getObject(i);
>
>It gets the object just fine but then I can't do anything with the
>object.  I can't do this:
>
>System.out.println("The result is: " + (String) obj);

No, this won't work as not all Objects returned are Strings.

The correct thing to do here is:

System.out.println("The result is: " + obj.toString() );

Which will work as all objects have the toString() method.

>or anything else.  I am guessing that the problem may be that it is
>trying to return an integer type, which is not an object.  Any
>sugestions on this?

Not possible. The int/long/double entities are not objects, so in this case
can never be returned. The driver should be wrapping them in
Integer/Long/Double objects instead.


>One thing I think I could do is to try to detect the type using
>MetaData.getResultType() or something, and then call
>ResultSet.getInt() or whatever is appropriate.  Is this the best way
>to do it?

That is an alternative, but the getObject() call should work.

Peter