Re: Problem with bytea

Daniel Carlsson wrote:> Hi
>
> When a fetch binary data from a bytea column the data gets messed up.
>
> Se the attached code, postgresql returns 13744 bytes when it should be only 10000. After studing the output I saw that bytes representing common characters are fetched ok but bytes representing unusual characters such as special swedish characters are messed up. Is the binary data somewhere treated as character data? Could something else be the problem?
>

I believe it does. Can you try and make your client encoding the same as your
server encoding and see if the problem goes away?

Fernando

P.S.: I guess you've meant documentid=17 in the line below:
> s.executeUpdate("update document set file_=null where documentid=12");

> I use RedHat 8.0, Postgresql 7.3.2 and jdbc driver pg73jdbc3.jar released 26:th of may.
>
> Code:
>
> Connection c = DriverManager.getConnection(jdbc);
> Statement s = c.createStatement(ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_UPDATABLE);
> ResultSet r;
>
> byte b[] = new byte[10000];
>
> for(int i=0;i<b.length;i++)
> b[i] = (byte)(i%256);
>
> /* Update bytea with 10000 bytes */
> s.executeUpdate("update document set file_=null where documentid=12");
> r = s.executeQuery("select file_,documentid from document where documentid=17");
> r.next();
> r.updateBytes(1,b);
> r.updateRow();
>
> /* Fetch the bytea value */
> r = s.executeQuery("select file_,documentid from document where documentid=17");
> r.next();
> b = r.getBytes(1);
>
> /* This outputs 13744 !?!? */
> System.out.println("Length: " + b.length);
>
>
>
> Med vänliga hälsningar
>
> Daniel Carlsson
> Gimlisoft AB
> Email: daniel(dot)carlsson(at)gimlisoft(dot)se
> Tel: 0709-744570, 031-189024
>
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--
Fernando Nasser
Red Hat - Toronto E-Mail: fnasser(at)redhat(dot)com
2323 Yonge Street, Suite #300
Toronto, Ontario M4P 2C9