Re: JDBC: what exactly does nullsAreSortedHigh() return?

From: Derek Chen-Becker <dbecker_at_cpicorp.com>
Date: Thu, 03 Jun 2004 09:05:34 -0500
Message-ID: <40BF302E.4040709@cpicorp.com>

Vikas Rana wrote:
> Hi all,
>
> I am a bit confused about the method
> java.sql.DatabaseMetaData.nullsAreSortedHigh(). What exactly does this
> return? If this returns true, are nulls considered as the highest
> value? Or does this mean that nulls comes first when sorted in
> ascending order (opposite in meaning to the first).
>
> Consider this.
>
> - Oracle returns false. Nulls are last when sorted in ascending order.
>
> - MSSQL2K returns true. Nulls are first when sorted in ascending
> order.
>
> - Postgres returns true. Nulls are last when sorted in ascending
> order.
>
> Now, behavior of Oracle and Postgres is same in terms of sort order,
> but they return different values.
>
> Who is right?

Here's the info from JDK1.4.2:

nullsAreSortedHigh

public boolean nullsAreSortedHigh()

                            throws SQLException

     Retrieves whether NULL values are sorted high. Sorted high means 

that NULL values sort higher than any other value in a domain. In an ascending order, if this method returns true, NULL values will appear at the end. By contrast, the method nullsAreSortedAtEnd indicates whether NULL values are sorted at the end regardless of sort order.

     Returns:
         true if so; false otherwise
     Throws:
         SQLException - if a database access error occurs

So it seems that both Oracle and MSSQL are wrong...

Derek Received on Thu Jun 03 2004 - 09:05:34 CDT