@Override
    public void close() throws Exception {
        connection.close();
        closed = true;
    }
@see io.apiman.gateway.engine.components.jdbc.IJdbcConnection#execute(io.apiman.gateway.engine.async.IAsyncResultHandler, java.lang.String, java.lang.Object[])
gateway/platforms/vertx3/vertx3/src/main/java/io/apiman/gateway/platforms/vertx3/components/jdbc/VertxJdbcConnection.java