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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