Re: A JDBC bug or problem relating to string length in Java

joe user wrote:
> That's a good idea, but unfortunately
> Connection.close() throws SQLException, so I would
> have to do something like this:
>
> try { }
> catch { }
> finally {
>     try { db.close(); }
>     catch(SQLException e) { log(...); }
> }

I haven't been reading this thread at all, but you can avoid writing some
of the boiler plate code, with something similar to the following:

PreparedStatement ps = null;
try {
    ps = prepareStatement(SQL_QUERY);
    ...
} catch (SQLException e) {
    ...
} finally {
    closeStatement(ps);
}

// the next two methods can go in a superclass for all your DAO's

void prepareStatement(String query) throws SQLException {
    Connection c = null;
    try {
        c = ...; // Get from pool or whatever
        return c.prepareStatement(query);
    } catch (SQLException e) {
        // Since nobody has a reference to the statement, kill the
        // underlying connection
        if (c != null) {
            c.close();// If this throws an SQLException, you'll lose e,
                  // you probably want to log it
        }
        throw e;
    }
}

void closeStatement(PreparedStatement ps) {
    if (ps == null) return;
    Connection c = null;
    try {
        c = ps.getConnection();
        ps.close();
    } catch (SQLException e) {
        ...
    } finally {
        try {
            if (c != null) {
                c.close();
            }
        } catch (SQLException e) {
            ...
        }
    }
}

I've just written this off the top of my head, so it may not be quite
right, hopefully it's clear enough to get the general idea.

Michael
--
Web Applications Developer
Open World Ltd, 11 Riverside Court, Riverside Road, Bath, BA2 3DZ.
Tel: +44 1225 444950  Fax: +44 1225 336738  http://www.openworld.co.uk/

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