@Override
    public void close(IAsyncResultHandler<Void> handler) {
        connection.close(translateVoidHandlers(handler));
        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