Re: res.wasNull() troubles when using CASE?

You have to call a getXXX() method first. wasNUll works with the last
column that was read.

Tom.

On Wed, 2002-11-13 at 12:33, Jean-Christian Imbeault wrote:
> I have the following query which seems to be having trouble with
> ResultSet.wasNull():
>
> String sql = "select case when date_sent is not null then
> to_char(date_sent::timestamp, 'YY-mm-DD HH:MI') else null end as
> date_sent from invoice_emails where invoice_id='" + id + "' order by
> date_sent";
>
> String s;
> ResultSet res = db.queryDB(sql);
> try {
>    while (res.next()) {
>      if (res.wasNull()) {
>        s = new String("Pending");
>        dates.add(s);
>      }
>      else {
>        s = res.getString("date_sent");
>        dates.add(s);
>      }
>    }
>    System.out.println(s);
> }
> catch (SQLException e) {System.out.println("ERROR");}
>
> When the returned value is null, the if (res.wasNull()) clause does not
> get executed ... but the value truly was null since when I print String
> s it is null.
>
> I tried the same query using the command line and it does return null
> when the date_sent column is null ... the JDBC driver however doesn't
> seem to realize this ...
>
> I'm sure it's my fault though. Can someone tell me where I went wrong?
>
> Thanks!
>
> Jc
>
>
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Thomas O'Dowd, CEO, Nooper.com - Mobile Services Inc., Tokyo, Japan
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