You need to check using wasNull method whether the value is null. See jdbc javadocs for ResultSet class.

On Dec 14, 2010 8:46 PM, "Patrick Meyer" <> wrote:
> What is the best way to handle missing values. For example, suppose I have
> an array that I want to insert into a table, like double[] row = {1.0, 2.0,
> MISSING, 4.0} where MISSING indicates a value that is missing. (I realize
> this is not a valid double value). I have been using a prepared statement to
> set a null value anytime I have missing data like, pstmt.setNull(i+1,
> Types.DOUBLE); However, the problem is that using rs.getDouble(3) returns a
> value of zero instead of null. The problem is that zero is a legitimate
> double value, not a missing or null value. Is it better to inset data using
> Double.NAN like pstmt.setDouble(i+1, Double.NaN);? What is the best way to
> handle missing data?
> Thanks